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freebsd-skq/sys/powerpc/booke/pmap.c
marcel 46e9143c7e Eliminate track_modified_needed(), better known as pmap_track_modified() 
on other platforms.  We no longer need it because we do not create managed
mappings within the clean submap.

Pointed out by: alc
2008-04-27 21:04:54 +00:00

3079 lines
77 KiB
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/*-
* Copyright (C) 2007 Semihalf, Rafal Jaworowski <raj@semihalf.com>
* Copyright (C) 2006 Semihalf, Marian Balakowicz <m8@semihalf.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Some hw specific parts of this pmap were derived or influenced
* by NetBSD's ibm4xx pmap module. More generic code is shared with
* a few other pmap modules from the FreeBSD tree.
*/
/*
* VM layout notes:
*
* Kernel and user threads run within one common virtual address space
* defined by AS=0.
*
* Virtual address space layout:
* -----------------------------
* 0x0000_0000 - 0xbfff_efff : user process
* 0xc000_0000 - 0xc1ff_ffff : kerel reserved
* 0xc000_0000 - kernelend : kernel code &data
* 0xc1ff_c000 - 0xc200_0000 : kstack0
* 0xc200_0000 - 0xffef_ffff : KVA
* 0xc200_0000 - 0xc200_3fff : reserved for page zero/copy
* 0xc200_4000 - ptbl buf end: reserved for ptbl bufs
* ptbl buf end- 0xffef_ffff : actual free KVA space
* 0xfff0_0000 - 0xffff_ffff : I/O devices region
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/msgbuf.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/vmmeter.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_kern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <vm/vm_param.h>
#include <vm/vm_map.h>
#include <vm/vm_pager.h>
#include <vm/uma.h>
#include <machine/cpu.h>
#include <machine/pcb.h>
#include <machine/powerpc.h>
#include <machine/tlb.h>
#include <machine/spr.h>
#include <machine/vmparam.h>
#include <machine/md_var.h>
#include <machine/mmuvar.h>
#include <machine/pmap.h>
#include <machine/pte.h>
#include "mmu_if.h"
#define DEBUG
#undef DEBUG
#ifdef DEBUG
#define debugf(fmt, args...) printf(fmt, ##args)
#else
#define debugf(fmt, args...)
#endif
#define TODO panic("%s: not implemented", __func__);
#define memmove(d, s, l) bcopy(s, d, l)
#include "opt_sched.h"
#ifndef SCHED_4BSD
#error "e500 only works with SCHED_4BSD which uses a global scheduler lock."
#endif
extern struct mtx sched_lock;
/* Kernel physical load address. */
extern uint32_t kernload;
struct mem_region availmem_regions[MEM_REGIONS];
int availmem_regions_sz;
/* Reserved KVA space and mutex for mmu_booke_zero_page. */
static vm_offset_t zero_page_va;
static struct mtx zero_page_mutex;
/*
* Reserved KVA space for mmu_booke_zero_page_idle. This is used
* by idle thred only, no lock required.
*/
static vm_offset_t zero_page_idle_va;
/* Reserved KVA space and mutex for mmu_booke_copy_page. */
static vm_offset_t copy_page_src_va;
static vm_offset_t copy_page_dst_va;
static struct mtx copy_page_mutex;
/**************************************************************************/
/* PMAP */
/**************************************************************************/
static void mmu_booke_enter_locked(mmu_t, pmap_t, vm_offset_t, vm_page_t,
vm_prot_t, boolean_t);
unsigned int kptbl_min; /* Index of the first kernel ptbl. */
unsigned int kernel_ptbls; /* Number of KVA ptbls. */
static int pagedaemon_waken;
/*
* If user pmap is processed with mmu_booke_remove and the resident count
* drops to 0, there are no more pages to remove, so we need not continue.
*/
#define PMAP_REMOVE_DONE(pmap) \
((pmap) != kernel_pmap && (pmap)->pm_stats.resident_count == 0)
extern void load_pid0(tlbtid_t);
/**************************************************************************/
/* TLB and TID handling */
/**************************************************************************/
/* Translation ID busy table */
static volatile pmap_t tidbusy[TID_MAX + 1];
/*
* Actual maximum number of TLB0 entries.
* This number differs between e500 core revisions.
*/
u_int32_t tlb0_size;
u_int32_t tlb0_nways;
u_int32_t tlb0_nentries_per_way;
#define TLB0_SIZE (tlb0_size)
#define TLB0_NWAYS (tlb0_nways)
#define TLB0_ENTRIES_PER_WAY (tlb0_nentries_per_way)
/* Pointer to kernel tlb0 table, allocated in mmu_booke_bootstrap() */
tlb_entry_t *tlb0;
/*
* Spinlock to assure proper locking between threads and
* between tlb miss handler and kernel.
*/
static struct mtx tlb0_mutex;
#define TLB1_SIZE 16
/* In-ram copy of the TLB1 */
static tlb_entry_t tlb1[TLB1_SIZE];
/* Next free entry in the TLB1 */
static unsigned int tlb1_idx;
static tlbtid_t tid_alloc(struct pmap *);
static void tid_flush(tlbtid_t);
extern void tlb1_inval_va(vm_offset_t);
extern void tlb0_inval_va(vm_offset_t);
static void tlb_print_entry(int, u_int32_t, u_int32_t, u_int32_t, u_int32_t);
static int tlb1_set_entry(vm_offset_t, vm_offset_t, vm_size_t, u_int32_t);
static void __tlb1_set_entry(unsigned int, vm_offset_t, vm_offset_t,
vm_size_t, u_int32_t, unsigned int, unsigned int);
static void tlb1_write_entry(unsigned int);
static int tlb1_iomapped(int, vm_paddr_t, vm_size_t, vm_offset_t *);
static vm_size_t tlb1_mapin_region(vm_offset_t, vm_offset_t, vm_size_t);
static vm_size_t tsize2size(unsigned int);
static unsigned int size2tsize(vm_size_t);
static unsigned int ilog2(unsigned int);
static void set_mas4_defaults(void);
static void tlb0_inval_entry(vm_offset_t, unsigned int);
static inline unsigned int tlb0_tableidx(vm_offset_t, unsigned int);
static void tlb0_write_entry(unsigned int, unsigned int);
static void tlb0_flush_entry(pmap_t, vm_offset_t);
static void tlb0_init(void);
/**************************************************************************/
/* Page table management */
/**************************************************************************/
/* Data for the pv entry allocation mechanism */
static uma_zone_t pvzone;
static struct vm_object pvzone_obj;
static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0;
#define PV_ENTRY_ZONE_MIN 2048 /* min pv entries in uma zone */
#ifndef PMAP_SHPGPERPROC
#define PMAP_SHPGPERPROC 200
#endif
static void ptbl_init(void);
static struct ptbl_buf *ptbl_buf_alloc(void);
static void ptbl_buf_free(struct ptbl_buf *);
static void ptbl_free_pmap_ptbl(pmap_t, pte_t *);
static void ptbl_alloc(mmu_t, pmap_t, unsigned int);
static void ptbl_free(mmu_t, pmap_t, unsigned int);
static void ptbl_hold(mmu_t, pmap_t, unsigned int);
static int ptbl_unhold(mmu_t, pmap_t, unsigned int);
static vm_paddr_t pte_vatopa(mmu_t, pmap_t, vm_offset_t);
static pte_t *pte_find(mmu_t, pmap_t, vm_offset_t);
void pte_enter(mmu_t, pmap_t, vm_page_t, vm_offset_t, u_int32_t);
static int pte_remove(mmu_t, pmap_t, vm_offset_t, u_int8_t);
pv_entry_t pv_alloc(void);
static void pv_free(pv_entry_t);
static void pv_insert(pmap_t, vm_offset_t, vm_page_t);
static void pv_remove(pmap_t, vm_offset_t, vm_page_t);
/* Number of kva ptbl buffers, each covering one ptbl (PTBL_PAGES). */
#define PTBL_BUFS (128 * 16)
struct ptbl_buf {
TAILQ_ENTRY(ptbl_buf) link; /* list link */
vm_offset_t kva; /* va of mapping */
};
/* ptbl free list and a lock used for access synchronization. */
static TAILQ_HEAD(, ptbl_buf) ptbl_buf_freelist;
static struct mtx ptbl_buf_freelist_lock;
/* Base address of kva space allocated fot ptbl bufs. */
static vm_offset_t ptbl_buf_pool_vabase;
/* Pointer to ptbl_buf structures. */
static struct ptbl_buf *ptbl_bufs;
/*
* Kernel MMU interface
*/
static vm_offset_t mmu_booke_addr_hint(mmu_t, vm_object_t, vm_offset_t, vm_size_t);
static void mmu_booke_change_wiring(mmu_t, pmap_t, vm_offset_t, boolean_t);
static void mmu_booke_clear_modify(mmu_t, vm_page_t);
static void mmu_booke_clear_reference(mmu_t, vm_page_t);
static void mmu_booke_copy(pmap_t, pmap_t, vm_offset_t, vm_size_t,
vm_offset_t);
static void mmu_booke_copy_page(mmu_t, vm_page_t, vm_page_t);
static void mmu_booke_enter(mmu_t, pmap_t, vm_offset_t, vm_page_t,
vm_prot_t, boolean_t);
static void mmu_booke_enter_object(mmu_t, pmap_t, vm_offset_t, vm_offset_t,
vm_page_t, vm_prot_t);
static void mmu_booke_enter_quick(mmu_t, pmap_t, vm_offset_t, vm_page_t,
vm_prot_t);
static vm_paddr_t mmu_booke_extract(mmu_t, pmap_t, vm_offset_t);
static vm_page_t mmu_booke_extract_and_hold(mmu_t, pmap_t, vm_offset_t,
vm_prot_t);
static void mmu_booke_init(mmu_t);
static boolean_t mmu_booke_is_modified(mmu_t, vm_page_t);
static boolean_t mmu_booke_is_prefaultable(mmu_t, pmap_t, vm_offset_t);
static boolean_t mmu_booke_ts_referenced(mmu_t, vm_page_t);
static vm_offset_t mmu_booke_map(mmu_t, vm_offset_t *, vm_offset_t, vm_offset_t,
int);
static int mmu_booke_mincore(mmu_t, pmap_t, vm_offset_t);
static void mmu_booke_object_init_pt(mmu_t, pmap_t, vm_offset_t,
vm_object_t, vm_pindex_t, vm_size_t);
static boolean_t mmu_booke_page_exists_quick(mmu_t, pmap_t, vm_page_t);
static void mmu_booke_page_init(mmu_t, vm_page_t);
static int mmu_booke_page_wired_mappings(mmu_t, vm_page_t);
static void mmu_booke_pinit(mmu_t, pmap_t);
static void mmu_booke_pinit0(mmu_t, pmap_t);
static void mmu_booke_protect(mmu_t, pmap_t, vm_offset_t, vm_offset_t,
vm_prot_t);
static void mmu_booke_qenter(mmu_t, vm_offset_t, vm_page_t *, int);
static void mmu_booke_qremove(mmu_t, vm_offset_t, int);
static void mmu_booke_release(mmu_t, pmap_t);
static void mmu_booke_remove(mmu_t, pmap_t, vm_offset_t, vm_offset_t);
static void mmu_booke_remove_all(mmu_t, vm_page_t);
static void mmu_booke_remove_write(mmu_t, vm_page_t);
static void mmu_booke_zero_page(mmu_t, vm_page_t);
static void mmu_booke_zero_page_area(mmu_t, vm_page_t, int, int);
static void mmu_booke_zero_page_idle(mmu_t, vm_page_t);
static void mmu_booke_activate(mmu_t, struct thread *);
static void mmu_booke_deactivate(mmu_t, struct thread *);
static void mmu_booke_bootstrap(mmu_t, vm_offset_t, vm_offset_t);
static void *mmu_booke_mapdev(mmu_t, vm_offset_t, vm_size_t);
static void mmu_booke_unmapdev(mmu_t, vm_offset_t, vm_size_t);
static vm_offset_t mmu_booke_kextract(mmu_t, vm_offset_t);
static void mmu_booke_kenter(mmu_t, vm_offset_t, vm_offset_t);
static void mmu_booke_kremove(mmu_t, vm_offset_t);
static boolean_t mmu_booke_dev_direct_mapped(mmu_t, vm_offset_t, vm_size_t);
static boolean_t mmu_booke_page_executable(mmu_t, vm_page_t);
static mmu_method_t mmu_booke_methods[] = {
/* pmap dispatcher interface */
MMUMETHOD(mmu_addr_hint, mmu_booke_addr_hint),
MMUMETHOD(mmu_change_wiring, mmu_booke_change_wiring),
MMUMETHOD(mmu_clear_modify, mmu_booke_clear_modify),
MMUMETHOD(mmu_clear_reference, mmu_booke_clear_reference),
MMUMETHOD(mmu_copy, mmu_booke_copy),
MMUMETHOD(mmu_copy_page, mmu_booke_copy_page),
MMUMETHOD(mmu_enter, mmu_booke_enter),
MMUMETHOD(mmu_enter_object, mmu_booke_enter_object),
MMUMETHOD(mmu_enter_quick, mmu_booke_enter_quick),
MMUMETHOD(mmu_extract, mmu_booke_extract),
MMUMETHOD(mmu_extract_and_hold, mmu_booke_extract_and_hold),
MMUMETHOD(mmu_init, mmu_booke_init),
MMUMETHOD(mmu_is_modified, mmu_booke_is_modified),
MMUMETHOD(mmu_is_prefaultable, mmu_booke_is_prefaultable),
MMUMETHOD(mmu_ts_referenced, mmu_booke_ts_referenced),
MMUMETHOD(mmu_map, mmu_booke_map),
MMUMETHOD(mmu_mincore, mmu_booke_mincore),
MMUMETHOD(mmu_object_init_pt, mmu_booke_object_init_pt),
MMUMETHOD(mmu_page_exists_quick,mmu_booke_page_exists_quick),
MMUMETHOD(mmu_page_init, mmu_booke_page_init),
MMUMETHOD(mmu_page_wired_mappings, mmu_booke_page_wired_mappings),
MMUMETHOD(mmu_pinit, mmu_booke_pinit),
MMUMETHOD(mmu_pinit0, mmu_booke_pinit0),
MMUMETHOD(mmu_protect, mmu_booke_protect),
MMUMETHOD(mmu_qenter, mmu_booke_qenter),
MMUMETHOD(mmu_qremove, mmu_booke_qremove),
MMUMETHOD(mmu_release, mmu_booke_release),
MMUMETHOD(mmu_remove, mmu_booke_remove),
MMUMETHOD(mmu_remove_all, mmu_booke_remove_all),
MMUMETHOD(mmu_remove_write, mmu_booke_remove_write),
MMUMETHOD(mmu_zero_page, mmu_booke_zero_page),
MMUMETHOD(mmu_zero_page_area, mmu_booke_zero_page_area),
MMUMETHOD(mmu_zero_page_idle, mmu_booke_zero_page_idle),
MMUMETHOD(mmu_activate, mmu_booke_activate),
MMUMETHOD(mmu_deactivate, mmu_booke_deactivate),
/* Internal interfaces */
MMUMETHOD(mmu_bootstrap, mmu_booke_bootstrap),
MMUMETHOD(mmu_dev_direct_mapped,mmu_booke_dev_direct_mapped),
MMUMETHOD(mmu_mapdev, mmu_booke_mapdev),
MMUMETHOD(mmu_kenter, mmu_booke_kenter),
MMUMETHOD(mmu_kextract, mmu_booke_kextract),
/* MMUMETHOD(mmu_kremove, mmu_booke_kremove), */
MMUMETHOD(mmu_page_executable, mmu_booke_page_executable),
MMUMETHOD(mmu_unmapdev, mmu_booke_unmapdev),
{ 0, 0 }
};
static mmu_def_t booke_mmu = {
MMU_TYPE_BOOKE,
mmu_booke_methods,
0
};
MMU_DEF(booke_mmu);
/* Return number of entries in TLB0. */
static __inline void
tlb0_get_tlbconf(void)
{
uint32_t tlb0_cfg;
tlb0_cfg = mfspr(SPR_TLB0CFG);
tlb0_size = tlb0_cfg & TLBCFG_NENTRY_MASK;
tlb0_nways = (tlb0_cfg & TLBCFG_ASSOC_MASK) >> TLBCFG_ASSOC_SHIFT;
tlb0_nentries_per_way = tlb0_size/tlb0_nways;
}
/* Initialize pool of kva ptbl buffers. */
static void
ptbl_init(void)
{
int i;
//debugf("ptbl_init: s (ptbl_bufs = 0x%08x size 0x%08x)\n",
// (u_int32_t)ptbl_bufs, sizeof(struct ptbl_buf) * PTBL_BUFS);
//debugf("ptbl_init: s (ptbl_buf_pool_vabase = 0x%08x size = 0x%08x)\n",
// ptbl_buf_pool_vabase, PTBL_BUFS * PTBL_PAGES * PAGE_SIZE);
mtx_init(&ptbl_buf_freelist_lock, "ptbl bufs lock", NULL, MTX_DEF);
TAILQ_INIT(&ptbl_buf_freelist);
for (i = 0; i < PTBL_BUFS; i++) {
ptbl_bufs[i].kva = ptbl_buf_pool_vabase + i * PTBL_PAGES * PAGE_SIZE;
TAILQ_INSERT_TAIL(&ptbl_buf_freelist, &ptbl_bufs[i], link);
}
//debugf("ptbl_init: e\n");
}
/* Get an sf_buf from the freelist. */
static struct ptbl_buf *
ptbl_buf_alloc(void)
{
struct ptbl_buf *buf;
//debugf("ptbl_buf_alloc: s\n");
mtx_lock(&ptbl_buf_freelist_lock);
buf = TAILQ_FIRST(&ptbl_buf_freelist);
if (buf != NULL)
TAILQ_REMOVE(&ptbl_buf_freelist, buf, link);
mtx_unlock(&ptbl_buf_freelist_lock);
//debugf("ptbl_buf_alloc: e (buf = 0x%08x)\n", (u_int32_t)buf);
return (buf);
}
/* Return ptbl buff to free pool. */
static void
ptbl_buf_free(struct ptbl_buf *buf)
{
//debugf("ptbl_buf_free: s (buf = 0x%08x)\n", (u_int32_t)buf);
mtx_lock(&ptbl_buf_freelist_lock);
TAILQ_INSERT_TAIL(&ptbl_buf_freelist, buf, link);
mtx_unlock(&ptbl_buf_freelist_lock);
//debugf("ptbl_buf_free: e\n");
}
/*
* Search the list of allocated ptbl bufs and find
* on list of allocated ptbls
*/
static void
ptbl_free_pmap_ptbl(pmap_t pmap, pte_t *ptbl)
{
struct ptbl_buf *pbuf;
//debugf("ptbl_free_pmap_ptbl: s (pmap = 0x%08x ptbl = 0x%08x)\n",
// (u_int32_t)pmap, (u_int32_t)ptbl);
TAILQ_FOREACH(pbuf, &pmap->ptbl_list, link) {
if (pbuf->kva == (vm_offset_t)ptbl) {
/* Remove from pmap ptbl buf list. */
TAILQ_REMOVE(&pmap->ptbl_list, pbuf, link);
/* Free correspondig ptbl buf. */
ptbl_buf_free(pbuf);
break;
}
}
//debugf("ptbl_free_pmap_ptbl: e\n");
}
/* Allocate page table. */
static void
ptbl_alloc(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx)
{
vm_page_t mtbl[PTBL_PAGES];
vm_page_t m;
struct ptbl_buf *pbuf;
unsigned int pidx;
int i;
//int su = (pmap == kernel_pmap);
//debugf("ptbl_alloc: s (pmap = 0x%08x su = %d pdir_idx = %d)\n", (u_int32_t)pmap, su, pdir_idx);
KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)),
("ptbl_alloc: invalid pdir_idx"));
KASSERT((pmap->pm_pdir[pdir_idx] == NULL),
("pte_alloc: valid ptbl entry exists!"));
pbuf = ptbl_buf_alloc();
if (pbuf == NULL)
panic("pte_alloc: couldn't alloc kernel virtual memory");
pmap->pm_pdir[pdir_idx] = (pte_t *)pbuf->kva;
//debugf("ptbl_alloc: kva = 0x%08x\n", (u_int32_t)pmap->pm_pdir[pdir_idx]);
/* Allocate ptbl pages, this will sleep! */
for (i = 0; i < PTBL_PAGES; i++) {
pidx = (PTBL_PAGES * pdir_idx) + i;
while ((m = vm_page_alloc(NULL, pidx, VM_ALLOC_NOOBJ | VM_ALLOC_WIRED)) == NULL) {
PMAP_UNLOCK(pmap);
vm_page_unlock_queues();
VM_WAIT;
vm_page_lock_queues();
PMAP_LOCK(pmap);
}
mtbl[i] = m;
}
/* Map in allocated pages into kernel_pmap. */
mmu_booke_qenter(mmu, (vm_offset_t)pmap->pm_pdir[pdir_idx], mtbl, PTBL_PAGES);
/* Zero whole ptbl. */
bzero((caddr_t)pmap->pm_pdir[pdir_idx], PTBL_PAGES * PAGE_SIZE);
/* Add pbuf to the pmap ptbl bufs list. */
TAILQ_INSERT_TAIL(&pmap->ptbl_list, pbuf, link);
//debugf("ptbl_alloc: e\n");
}
/* Free ptbl pages and invalidate pdir entry. */
static void
ptbl_free(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx)
{
pte_t *ptbl;
vm_paddr_t pa;
vm_offset_t va;
vm_page_t m;
int i;
//int su = (pmap == kernel_pmap);
//debugf("ptbl_free: s (pmap = 0x%08x su = %d pdir_idx = %d)\n", (u_int32_t)pmap, su, pdir_idx);
KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)),
("ptbl_free: invalid pdir_idx"));
ptbl = pmap->pm_pdir[pdir_idx];
//debugf("ptbl_free: ptbl = 0x%08x\n", (u_int32_t)ptbl);
KASSERT((ptbl != NULL), ("ptbl_free: null ptbl"));
for (i = 0; i < PTBL_PAGES; i++) {
va = ((vm_offset_t)ptbl + (i * PAGE_SIZE));
pa = pte_vatopa(mmu, kernel_pmap, va);
m = PHYS_TO_VM_PAGE(pa);
vm_page_free_zero(m);
atomic_subtract_int(&cnt.v_wire_count, 1);
mmu_booke_kremove(mmu, va);
}
ptbl_free_pmap_ptbl(pmap, ptbl);
pmap->pm_pdir[pdir_idx] = NULL;
//debugf("ptbl_free: e\n");
}
/*
* Decrement ptbl pages hold count and attempt to free ptbl pages.
* Called when removing pte entry from ptbl.
*
* Return 1 if ptbl pages were freed.
*/
static int
ptbl_unhold(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx)
{
pte_t *ptbl;
vm_paddr_t pa;
vm_page_t m;
int i;
//int su = (pmap == kernel_pmap);
//debugf("ptbl_unhold: s (pmap = %08x su = %d pdir_idx = %d)\n",
// (u_int32_t)pmap, su, pdir_idx);
KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)),
("ptbl_unhold: invalid pdir_idx"));
KASSERT((pmap != kernel_pmap),
("ptbl_unhold: unholding kernel ptbl!"));
ptbl = pmap->pm_pdir[pdir_idx];
//debugf("ptbl_unhold: ptbl = 0x%08x\n", (u_int32_t)ptbl);
KASSERT(((vm_offset_t)ptbl >= VM_MIN_KERNEL_ADDRESS),
("ptbl_unhold: non kva ptbl"));
/* decrement hold count */
for (i = 0; i < PTBL_PAGES; i++) {
pa = pte_vatopa(mmu, kernel_pmap, (vm_offset_t)ptbl + (i * PAGE_SIZE));
m = PHYS_TO_VM_PAGE(pa);
m->wire_count--;
}
/*
* Free ptbl pages if there are no pte etries in this ptbl.
* wire_count has the same value for all ptbl pages, so check
* the last page.
*/
if (m->wire_count == 0) {
ptbl_free(mmu, pmap, pdir_idx);
//debugf("ptbl_unhold: e (freed ptbl)\n");
return (1);
}
//debugf("ptbl_unhold: e\n");
return (0);
}
/*
* Increment hold count for ptbl pages. This routine is used when
* new pte entry is being inserted into ptbl.
*/
static void
ptbl_hold(mmu_t mmu, pmap_t pmap, unsigned int pdir_idx)
{
vm_paddr_t pa;
pte_t *ptbl;
vm_page_t m;
int i;
//debugf("ptbl_hold: s (pmap = 0x%08x pdir_idx = %d)\n", (u_int32_t)pmap, pdir_idx);
KASSERT((pdir_idx <= (VM_MAXUSER_ADDRESS / PDIR_SIZE)),
("ptbl_hold: invalid pdir_idx"));
KASSERT((pmap != kernel_pmap),
("ptbl_hold: holding kernel ptbl!"));
ptbl = pmap->pm_pdir[pdir_idx];
KASSERT((ptbl != NULL), ("ptbl_hold: null ptbl"));
for (i = 0; i < PTBL_PAGES; i++) {
pa = pte_vatopa(mmu, kernel_pmap, (vm_offset_t)ptbl + (i * PAGE_SIZE));
m = PHYS_TO_VM_PAGE(pa);
m->wire_count++;
}
//debugf("ptbl_hold: e\n");
}
/* Allocate pv_entry structure. */
pv_entry_t
pv_alloc(void)
{
pv_entry_t pv;
debugf("pv_alloc: s\n");
pv_entry_count++;
if ((pv_entry_count > pv_entry_high_water) && (pagedaemon_waken == 0)) {
pagedaemon_waken = 1;
wakeup (&vm_pages_needed);
}
pv = uma_zalloc(pvzone, M_NOWAIT);
debugf("pv_alloc: e\n");
return (pv);
}
/* Free pv_entry structure. */
static __inline void
pv_free(pv_entry_t pve)
{
//debugf("pv_free: s\n");
pv_entry_count--;
uma_zfree(pvzone, pve);
//debugf("pv_free: e\n");
}
/* Allocate and initialize pv_entry structure. */
static void
pv_insert(pmap_t pmap, vm_offset_t va, vm_page_t m)
{
pv_entry_t pve;
//int su = (pmap == kernel_pmap);
//debugf("pv_insert: s (su = %d pmap = 0x%08x va = 0x%08x m = 0x%08x)\n", su,
// (u_int32_t)pmap, va, (u_int32_t)m);
pve = pv_alloc();
if (pve == NULL)
panic("pv_insert: no pv entries!");
pve->pv_pmap = pmap;
pve->pv_va = va;
/* add to pv_list */
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
TAILQ_INSERT_TAIL(&m->md.pv_list, pve, pv_link);
//debugf("pv_insert: e\n");
}
/* Destroy pv entry. */
static void
pv_remove(pmap_t pmap, vm_offset_t va, vm_page_t m)
{
pv_entry_t pve;
//int su = (pmap == kernel_pmap);
//debugf("pv_remove: s (su = %d pmap = 0x%08x va = 0x%08x)\n", su, (u_int32_t)pmap, va);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
/* find pv entry */
TAILQ_FOREACH(pve, &m->md.pv_list, pv_link) {
if ((pmap == pve->pv_pmap) && (va == pve->pv_va)) {
/* remove from pv_list */
TAILQ_REMOVE(&m->md.pv_list, pve, pv_link);
if (TAILQ_EMPTY(&m->md.pv_list))
vm_page_flag_clear(m, PG_WRITEABLE);
/* free pv entry struct */
pv_free(pve);
break;
}
}
//debugf("pv_remove: e\n");
}
/*
* Clean pte entry, try to free page table page if requested.
*
* Return 1 if ptbl pages were freed, otherwise return 0.
*/
static int
pte_remove(mmu_t mmu, pmap_t pmap, vm_offset_t va, u_int8_t flags)
{
unsigned int pdir_idx = PDIR_IDX(va);
unsigned int ptbl_idx = PTBL_IDX(va);
vm_page_t m;
pte_t *ptbl;
pte_t *pte;
//int su = (pmap == kernel_pmap);
//debugf("pte_remove: s (su = %d pmap = 0x%08x va = 0x%08x flags = %d)\n",
// su, (u_int32_t)pmap, va, flags);
ptbl = pmap->pm_pdir[pdir_idx];
KASSERT(ptbl, ("pte_remove: null ptbl"));
pte = &ptbl[ptbl_idx];
if (pte == NULL || !PTE_ISVALID(pte))
return (0);
/* Get vm_page_t for mapped pte. */
m = PHYS_TO_VM_PAGE(PTE_PA(pte));
if (PTE_ISWIRED(pte))
pmap->pm_stats.wired_count--;
if (!PTE_ISFAKE(pte)) {
/* Handle managed entry. */
if (PTE_ISMANAGED(pte)) {
/* Handle modified pages. */
if (PTE_ISMODIFIED(pte))
vm_page_dirty(m);
/* Referenced pages. */
if (PTE_ISREFERENCED(pte))
vm_page_flag_set(m, PG_REFERENCED);
/* Remove pv_entry from pv_list. */
pv_remove(pmap, va, m);
}
}
pte->flags = 0;
pte->rpn = 0;
pmap->pm_stats.resident_count--;
if (flags & PTBL_UNHOLD) {
//debugf("pte_remove: e (unhold)\n");
return (ptbl_unhold(mmu, pmap, pdir_idx));
}
//debugf("pte_remove: e\n");
return (0);
}
/*
* Insert PTE for a given page and virtual address.
*/
void
pte_enter(mmu_t mmu, pmap_t pmap, vm_page_t m, vm_offset_t va, u_int32_t flags)
{
unsigned int pdir_idx = PDIR_IDX(va);
unsigned int ptbl_idx = PTBL_IDX(va);
pte_t *ptbl;
pte_t *pte;
//int su = (pmap == kernel_pmap);
//debugf("pte_enter: s (su = %d pmap = 0x%08x va = 0x%08x)\n", su, (u_int32_t)pmap, va);
/* Get the page table pointer. */
ptbl = pmap->pm_pdir[pdir_idx];
if (ptbl) {
/*
* Check if there is valid mapping for requested
* va, if there is, remove it.
*/
pte = &pmap->pm_pdir[pdir_idx][ptbl_idx];
if (PTE_ISVALID(pte)) {
pte_remove(mmu, pmap, va, PTBL_HOLD);
} else {
/*
* pte is not used, increment hold count
* for ptbl pages.
*/
if (pmap != kernel_pmap)
ptbl_hold(mmu, pmap, pdir_idx);
}
} else {
/* Allocate page table pages. */
ptbl_alloc(mmu, pmap, pdir_idx);
}
/* Flush entry from TLB. */
tlb0_flush_entry(pmap, va);
pte = &(pmap->pm_pdir[pdir_idx][ptbl_idx]);
/*
* Insert pv_entry into pv_list for mapped page
* if part of managed memory.
*/
if ((m->flags & PG_FICTITIOUS) == 0) {
if ((m->flags & PG_UNMANAGED) == 0) {
pte->flags |= PTE_MANAGED;
/* Create and insert pv entry. */
pv_insert(pmap, va, m);
}
} else {
pte->flags |= PTE_FAKE;
}
pmap->pm_stats.resident_count++;
pte->rpn = VM_PAGE_TO_PHYS(m) & ~PTE_PA_MASK;
pte->flags |= (PTE_VALID | flags);
//debugf("pte_enter: e\n");
}
/* Return the pa for the given pmap/va. */
static vm_paddr_t
pte_vatopa(mmu_t mmu, pmap_t pmap, vm_offset_t va)
{
vm_paddr_t pa = 0;
pte_t *pte;
pte = pte_find(mmu, pmap, va);
if ((pte != NULL) && PTE_ISVALID(pte))
pa = (PTE_PA(pte) | (va & PTE_PA_MASK));
return (pa);
}
/* Get a pointer to a PTE in a page table. */
static pte_t *
pte_find(mmu_t mmu, pmap_t pmap, vm_offset_t va)
{
unsigned int pdir_idx = PDIR_IDX(va);
unsigned int ptbl_idx = PTBL_IDX(va);
KASSERT((pmap != NULL), ("pte_find: invalid pmap"));
if (pmap->pm_pdir[pdir_idx])
return (&(pmap->pm_pdir[pdir_idx][ptbl_idx]));
return (NULL);
}
/**************************************************************************/
/* PMAP related */
/**************************************************************************/
/*
* This is called during e500_init, before the system is really initialized.
*/
static void
mmu_booke_bootstrap(mmu_t mmu, vm_offset_t kernelstart, vm_offset_t kernelend)
{
vm_offset_t phys_kernelend;
struct mem_region *mp, *mp1;
int cnt, i, j;
u_int s, e, sz;
u_int phys_avail_count;
vm_size_t physsz, hwphyssz;
vm_offset_t kernel_pdir;
debugf("mmu_booke_bootstrap: entered\n");
/* Align kernel start and end address (kernel image). */
kernelstart = trunc_page(kernelstart);
kernelend = round_page(kernelend);
/* Allocate space for the message buffer. */
msgbufp = (struct msgbuf *)kernelend;
kernelend += MSGBUF_SIZE;
debugf(" msgbufp at 0x%08x end = 0x%08x\n", (u_int32_t)msgbufp,
kernelend);
kernelend = round_page(kernelend);
/* Allocate space for tlb0 table. */
tlb0_get_tlbconf(); /* Read TLB0 size and associativity. */
tlb0 = (tlb_entry_t *)kernelend;
kernelend += sizeof(tlb_entry_t) * tlb0_size;
memset((void *)tlb0, 0, sizeof(tlb_entry_t) * tlb0_size);
debugf(" tlb0 at 0x%08x end = 0x%08x\n", (u_int32_t)tlb0, kernelend);
kernelend = round_page(kernelend);
/* Allocate space for ptbl_bufs. */
ptbl_bufs = (struct ptbl_buf *)kernelend;
kernelend += sizeof(struct ptbl_buf) * PTBL_BUFS;
memset((void *)ptbl_bufs, 0, sizeof(struct ptbl_buf) * PTBL_SIZE);
debugf(" ptbl_bufs at 0x%08x end = 0x%08x\n", (u_int32_t)ptbl_bufs,
kernelend);
kernelend = round_page(kernelend);
/* Allocate PTE tables for kernel KVA. */
kernel_pdir = kernelend;
kernel_ptbls = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS +
PDIR_SIZE - 1) / PDIR_SIZE;
kernelend += kernel_ptbls * PTBL_PAGES * PAGE_SIZE;
memset((void *)kernel_pdir, 0, kernel_ptbls * PTBL_PAGES * PAGE_SIZE);
debugf(" kernel ptbls: %d\n", kernel_ptbls);
debugf(" kernel pdir at 0x%08x\n", kernel_pdir);
if (kernelend - kernelstart > 0x1000000) {
kernelend = (kernelend + 0x3fffff) & ~0x3fffff;
tlb1_mapin_region(kernelstart + 0x1000000,
kernload + 0x1000000, kernelend - kernelstart - 0x1000000);
} else
kernelend = (kernelend + 0xffffff) & ~0xffffff;
/*******************************************************/
/* Set the start and end of kva. */
/*******************************************************/
virtual_avail = kernelend;
virtual_end = VM_MAX_KERNEL_ADDRESS;
/* Allocate KVA space for page zero/copy operations. */
zero_page_va = virtual_avail;
virtual_avail += PAGE_SIZE;
zero_page_idle_va = virtual_avail;
virtual_avail += PAGE_SIZE;
copy_page_src_va = virtual_avail;
virtual_avail += PAGE_SIZE;
copy_page_dst_va = virtual_avail;
virtual_avail += PAGE_SIZE;
/* Initialize page zero/copy mutexes. */
mtx_init(&zero_page_mutex, "mmu_booke_zero_page", NULL, MTX_DEF);
mtx_init(&copy_page_mutex, "mmu_booke_copy_page", NULL, MTX_DEF);
/* Initialize tlb0 table mutex. */
mtx_init(&tlb0_mutex, "tlb0", NULL, MTX_SPIN | MTX_RECURSE);
/* Allocate KVA space for ptbl bufs. */
ptbl_buf_pool_vabase = virtual_avail;
virtual_avail += PTBL_BUFS * PTBL_PAGES * PAGE_SIZE;
debugf("ptbl_buf_pool_vabase = 0x%08x\n", ptbl_buf_pool_vabase);
debugf("virtual_avail = %08x\n", virtual_avail);
debugf("virtual_end = %08x\n", virtual_end);
/* Calculate corresponding physical addresses for the kernel region. */
phys_kernelend = kernload + (kernelend - kernelstart);
debugf("kernel image and allocated data:\n");
debugf(" kernload = 0x%08x\n", kernload);
debugf(" kernelstart = 0x%08x\n", kernelstart);
debugf(" kernelend = 0x%08x\n", kernelend);
debugf(" kernel size = 0x%08x\n", kernelend - kernelstart);
if (sizeof(phys_avail) / sizeof(phys_avail[0]) < availmem_regions_sz)
panic("mmu_booke_bootstrap: phys_avail too small");
/*
* Removed kernel physical address range from avail
* regions list. Page align all regions.
* Non-page aligned memory isn't very interesting to us.
* Also, sort the entries for ascending addresses.
*/
sz = 0;
cnt = availmem_regions_sz;
debugf("processing avail regions:\n");
for (mp = availmem_regions; mp->mr_size; mp++) {
s = mp->mr_start;
e = mp->mr_start + mp->mr_size;
debugf(" %08x-%08x -> ", s, e);
/* Check whether this region holds all of the kernel. */
if (s < kernload && e > phys_kernelend) {
availmem_regions[cnt].mr_start = phys_kernelend;
availmem_regions[cnt++].mr_size = e - phys_kernelend;
e = kernload;
}
/* Look whether this regions starts within the kernel. */
if (s >= kernload && s < phys_kernelend) {
if (e <= phys_kernelend)
goto empty;
s = phys_kernelend;
}
/* Now look whether this region ends within the kernel. */
if (e > kernload && e <= phys_kernelend) {
if (s >= kernload)
goto empty;
e = kernload;
}
/* Now page align the start and size of the region. */
s = round_page(s);
e = trunc_page(e);
if (e < s)
e = s;
sz = e - s;
debugf("%08x-%08x = %x\n", s, e, sz);
/* Check whether some memory is left here. */
if (sz == 0) {
empty:
memmove(mp, mp + 1,
(cnt - (mp - availmem_regions)) * sizeof(*mp));
cnt--;
mp--;
continue;
}
/* Do an insertion sort. */
for (mp1 = availmem_regions; mp1 < mp; mp1++)
if (s < mp1->mr_start)
break;
if (mp1 < mp) {
memmove(mp1 + 1, mp1, (char *)mp - (char *)mp1);
mp1->mr_start = s;
mp1->mr_size = sz;
} else {
mp->mr_start = s;
mp->mr_size = sz;
}
}
availmem_regions_sz = cnt;
/*******************************************************/
/* Fill in phys_avail table, based on availmem_regions */
/*******************************************************/
phys_avail_count = 0;
physsz = 0;
hwphyssz = 0;
TUNABLE_ULONG_FETCH("hw.physmem", (u_long *) &hwphyssz);
debugf("fill in phys_avail:\n");
for (i = 0, j = 0; i < availmem_regions_sz; i++, j += 2) {
debugf(" region: 0x%08x - 0x%08x (0x%08x)\n",
availmem_regions[i].mr_start,
availmem_regions[i].mr_start + availmem_regions[i].mr_size,
availmem_regions[i].mr_size);
if (hwphyssz != 0 && (physsz + availmem_regions[i].mr_size) >= hwphyssz) {
debugf(" hw.physmem adjust\n");
if (physsz < hwphyssz) {
phys_avail[j] = availmem_regions[i].mr_start;
phys_avail[j + 1] = availmem_regions[i].mr_start +
hwphyssz - physsz;
physsz = hwphyssz;
phys_avail_count++;
}
break;
}
phys_avail[j] = availmem_regions[i].mr_start;
phys_avail[j + 1] = availmem_regions[i].mr_start +
availmem_regions[i].mr_size;
phys_avail_count++;
physsz += availmem_regions[i].mr_size;
}
physmem = btoc(physsz);
/* Calculate the last available physical address. */
for (i = 0; phys_avail[i + 2] != 0; i += 2)
;
Maxmem = powerpc_btop(phys_avail[i + 1]);
debugf("Maxmem = 0x%08lx\n", Maxmem);
debugf("phys_avail_count = %d\n", phys_avail_count);
debugf("physsz = 0x%08x physmem = %ld (0x%08lx)\n", physsz, physmem, physmem);
/*******************************************************/
/* Initialize (statically allocated) kernel pmap. */
/*******************************************************/
PMAP_LOCK_INIT(kernel_pmap);
kptbl_min = VM_MIN_KERNEL_ADDRESS / PDIR_SIZE;
debugf("kernel_pmap = 0x%08x\n", (u_int32_t)kernel_pmap);
debugf("kptbl_min = %d, kernel_kptbls = %d\n", kptbl_min, kernel_ptbls);
debugf("kernel pdir range: 0x%08x - 0x%08x\n",
kptbl_min * PDIR_SIZE, (kptbl_min + kernel_ptbls) * PDIR_SIZE - 1);
/* Initialize kernel pdir */
for (i = 0; i < kernel_ptbls; i++)
kernel_pmap->pm_pdir[kptbl_min + i] =
(pte_t *)(kernel_pdir + (i * PAGE_SIZE * PTBL_PAGES));
kernel_pmap->pm_tid = KERNEL_TID;
kernel_pmap->pm_active = ~0;
/* Initialize tidbusy with kenel_pmap entry. */
tidbusy[0] = kernel_pmap;
/*******************************************************/
/* Final setup */
/*******************************************************/
/* Initialize TLB0 handling. */
tlb0_init();
debugf("mmu_booke_bootstrap: exit\n");
}
/*
* Get the physical page address for the given pmap/virtual address.
*/
static vm_paddr_t
mmu_booke_extract(mmu_t mmu, pmap_t pmap, vm_offset_t va)
{
vm_paddr_t pa;
PMAP_LOCK(pmap);
pa = pte_vatopa(mmu, pmap, va);
PMAP_UNLOCK(pmap);
return (pa);
}
/*
* Extract the physical page address associated with the given
* kernel virtual address.
*/
static vm_paddr_t
mmu_booke_kextract(mmu_t mmu, vm_offset_t va)
{
return (pte_vatopa(mmu, kernel_pmap, va));
}
/*
* Initialize the pmap module.
* Called by vm_init, to initialize any structures that the pmap
* system needs to map virtual memory.
*/
static void
mmu_booke_init(mmu_t mmu)
{
int shpgperproc = PMAP_SHPGPERPROC;
//debugf("mmu_booke_init: s\n");
/*
* Initialize the address space (zone) for the pv entries. Set a
* high water mark so that the system can recover from excessive
* numbers of pv entries.
*/
pvzone = uma_zcreate("PV ENTRY", sizeof(struct pv_entry), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE);
TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc);
pv_entry_max = shpgperproc * maxproc + cnt.v_page_count;
TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max);
pv_entry_high_water = 9 * (pv_entry_max / 10);
uma_zone_set_obj(pvzone, &pvzone_obj, pv_entry_max);
/* Pre-fill pvzone with initial number of pv entries. */
uma_prealloc(pvzone, PV_ENTRY_ZONE_MIN);
/* Initialize ptbl allocation. */
ptbl_init();
//debugf("mmu_booke_init: e\n");
}
/*
* Map a list of wired pages into kernel virtual address space. This is
* intended for temporary mappings which do not need page modification or
* references recorded. Existing mappings in the region are overwritten.
*/
static void
mmu_booke_qenter(mmu_t mmu, vm_offset_t sva, vm_page_t *m, int count)
{
vm_offset_t va;
//debugf("mmu_booke_qenter: s (sva = 0x%08x count = %d)\n", sva, count);
va = sva;
while (count-- > 0) {
mmu_booke_kenter(mmu, va, VM_PAGE_TO_PHYS(*m));
va += PAGE_SIZE;
m++;
}
//debugf("mmu_booke_qenter: e\n");
}
/*
* Remove page mappings from kernel virtual address space. Intended for
* temporary mappings entered by mmu_booke_qenter.
*/
static void
mmu_booke_qremove(mmu_t mmu, vm_offset_t sva, int count)
{
vm_offset_t va;
//debugf("mmu_booke_qremove: s (sva = 0x%08x count = %d)\n", sva, count);
va = sva;
while (count-- > 0) {
mmu_booke_kremove(mmu, va);
va += PAGE_SIZE;
}
//debugf("mmu_booke_qremove: e\n");
}
/*
* Map a wired page into kernel virtual address space.
*/
static void
mmu_booke_kenter(mmu_t mmu, vm_offset_t va, vm_offset_t pa)
{
unsigned int pdir_idx = PDIR_IDX(va);
unsigned int ptbl_idx = PTBL_IDX(va);
u_int32_t flags;
pte_t *pte;
//debugf("mmu_booke_kenter: s (pdir_idx = %d ptbl_idx = %d va=0x%08x pa=0x%08x)\n",
// pdir_idx, ptbl_idx, va, pa);
KASSERT(((va >= VM_MIN_KERNEL_ADDRESS) && (va <= VM_MAX_KERNEL_ADDRESS)),
("mmu_booke_kenter: invalid va"));
#if 0
/* assume IO mapping, set I, G bits */
flags = (PTE_G | PTE_I | PTE_FAKE);
/* if mapping is within system memory, do not set I, G bits */
for (i = 0; i < totalmem_regions_sz; i++) {
if ((pa >= totalmem_regions[i].mr_start) &&
(pa < (totalmem_regions[i].mr_start +
totalmem_regions[i].mr_size))) {
flags &= ~(PTE_I | PTE_G | PTE_FAKE);
break;
}
}
#else
flags = 0;
#endif
flags |= (PTE_SR | PTE_SW | PTE_SX | PTE_WIRED | PTE_VALID);
pte = &(kernel_pmap->pm_pdir[pdir_idx][ptbl_idx]);
if (PTE_ISVALID(pte)) {
//debugf("mmu_booke_kenter: replacing entry!\n");
/* Flush entry from TLB0 */
tlb0_flush_entry(kernel_pmap, va);
}
pte->rpn = pa & ~PTE_PA_MASK;
pte->flags = flags;
//debugf("mmu_booke_kenter: pdir_idx = %d ptbl_idx = %d va=0x%08x "
// "pa=0x%08x rpn=0x%08x flags=0x%08x\n",
// pdir_idx, ptbl_idx, va, pa, pte->rpn, pte->flags);
/* Flush the real memory from the instruction cache. */
if ((flags & (PTE_I | PTE_G)) == 0) {
__syncicache((void *)va, PAGE_SIZE);
}
//debugf("mmu_booke_kenter: e\n");
}
/*
* Remove a page from kernel page table.
*/
static void
mmu_booke_kremove(mmu_t mmu, vm_offset_t va)
{
unsigned int pdir_idx = PDIR_IDX(va);
unsigned int ptbl_idx = PTBL_IDX(va);
pte_t *pte;
//debugf("mmu_booke_kremove: s (va = 0x%08x)\n", va);
KASSERT(((va >= VM_MIN_KERNEL_ADDRESS) && (va <= VM_MAX_KERNEL_ADDRESS)),
("mmu_booke_kremove: invalid va"));
pte = &(kernel_pmap->pm_pdir[pdir_idx][ptbl_idx]);
if (!PTE_ISVALID(pte)) {
//debugf("mmu_booke_kremove: e (invalid pte)\n");
return;
}
/* Invalidate entry in TLB0. */
tlb0_flush_entry(kernel_pmap, va);
pte->flags = 0;
pte->rpn = 0;
//debugf("mmu_booke_kremove: e\n");
}
/*
* Initialize pmap associated with process 0.
*/
static void
mmu_booke_pinit0(mmu_t mmu, pmap_t pmap)
{
//debugf("mmu_booke_pinit0: s (pmap = 0x%08x)\n", (u_int32_t)pmap);
mmu_booke_pinit(mmu, pmap);
PCPU_SET(curpmap, pmap);
//debugf("mmu_booke_pinit0: e\n");
}
/*
* Initialize a preallocated and zeroed pmap structure,
* such as one in a vmspace structure.
*/
static void
mmu_booke_pinit(mmu_t mmu, pmap_t pmap)
{
//struct thread *td;
//struct proc *p;
//td = PCPU_GET(curthread);
//p = td->td_proc;
//debugf("mmu_booke_pinit: s (pmap = 0x%08x)\n", (u_int32_t)pmap);
//printf("mmu_booke_pinit: proc %d '%s'\n", p->p_pid, p->p_comm);
KASSERT((pmap != kernel_pmap), ("mmu_booke_pinit: initializing kernel_pmap"));
PMAP_LOCK_INIT(pmap);
pmap->pm_tid = 0;
pmap->pm_active = 0;
bzero(&pmap->pm_stats, sizeof(pmap->pm_stats));
bzero(&pmap->pm_pdir, sizeof(pte_t *) * PDIR_NENTRIES);
TAILQ_INIT(&pmap->ptbl_list);
//debugf("mmu_booke_pinit: e\n");
}
/*
* Release any resources held by the given physical map.
* Called when a pmap initialized by mmu_booke_pinit is being released.
* Should only be called if the map contains no valid mappings.
*/
static void
mmu_booke_release(mmu_t mmu, pmap_t pmap)
{
//debugf("mmu_booke_release: s\n");
PMAP_LOCK_DESTROY(pmap);
//debugf("mmu_booke_release: e\n");
}
#if 0
/* Not needed, kernel page tables are statically allocated. */
void
mmu_booke_growkernel(vm_offset_t maxkvaddr)
{
}
#endif
/*
* Insert the given physical page at the specified virtual address in the
* target physical map with the protection requested. If specified the page
* will be wired down.
*/
static void
mmu_booke_enter(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_prot_t prot, boolean_t wired)
{
vm_page_lock_queues();
PMAP_LOCK(pmap);
mmu_booke_enter_locked(mmu, pmap, va, m, prot, wired);
vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
static void
mmu_booke_enter_locked(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_prot_t prot, boolean_t wired)
{
pte_t *pte;
vm_paddr_t pa;
u_int32_t flags;
int su, sync;
pa = VM_PAGE_TO_PHYS(m);
su = (pmap == kernel_pmap);
sync = 0;
//debugf("mmu_booke_enter_locked: s (pmap=0x%08x su=%d tid=%d m=0x%08x va=0x%08x "
// "pa=0x%08x prot=0x%08x wired=%d)\n",
// (u_int32_t)pmap, su, pmap->pm_tid,
// (u_int32_t)m, va, pa, prot, wired);
if (su) {
KASSERT(((va >= virtual_avail) && (va <= VM_MAX_KERNEL_ADDRESS)),
("mmu_booke_enter_locked: kernel pmap, non kernel va"));
} else {
KASSERT((va <= VM_MAXUSER_ADDRESS),
("mmu_booke_enter_locked: user pmap, non user va"));
}
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
/*
* If there is an existing mapping, and the physical address has not
* changed, must be protection or wiring change.
*/
if (((pte = pte_find(mmu, pmap, va)) != NULL) &&
(PTE_ISVALID(pte)) && (PTE_PA(pte) == pa)) {
//debugf("mmu_booke_enter_locked: update\n");
/* Wiring change, just update stats. */
if (wired) {
if (!PTE_ISWIRED(pte)) {
pte->flags |= PTE_WIRED;
pmap->pm_stats.wired_count++;
}
} else {
if (PTE_ISWIRED(pte)) {
pte->flags &= ~PTE_WIRED;
pmap->pm_stats.wired_count--;
}
}
/* Save the old bits and clear the ones we're interested in. */
flags = pte->flags;
pte->flags &= ~(PTE_UW | PTE_UX | PTE_SW | PTE_SX | PTE_MODIFIED);
if (prot & VM_PROT_WRITE) {
/* Add write permissions. */
pte->flags |= PTE_SW;
if (!su)
pte->flags |= PTE_UW;
} else {
/* Handle modified pages, sense modify status. */
if (PTE_ISMODIFIED(pte))
vm_page_dirty(m);
}
/* If we're turning on execute permissions, flush the icache. */
if (prot & VM_PROT_EXECUTE) {
pte->flags |= PTE_SX;
if (!su)
pte->flags |= PTE_UX;
if ((flags & (PTE_UX | PTE_SX)) == 0)
sync++;
}
/* Flush the old mapping from TLB0. */
pte->flags &= ~PTE_REFERENCED;
tlb0_flush_entry(pmap, va);
} else {
/*
* If there is an existing mapping, but its for a different
* physical address, pte_enter() will delete the old mapping.
*/
//if ((pte != NULL) && PTE_ISVALID(pte))
// debugf("mmu_booke_enter_locked: replace\n");
//else
// debugf("mmu_booke_enter_locked: new\n");
/* Now set up the flags and install the new mapping. */
flags = (PTE_SR | PTE_VALID);
if (!su)
flags |= PTE_UR;
if (prot & VM_PROT_WRITE) {
flags |= PTE_SW;
if (!su)
flags |= PTE_UW;
}
if (prot & VM_PROT_EXECUTE) {
flags |= PTE_SX;
if (!su)
flags |= PTE_UX;
}
/* If its wired update stats. */
if (wired) {
pmap->pm_stats.wired_count++;
flags |= PTE_WIRED;
}
pte_enter(mmu, pmap, m, va, flags);
/* Flush the real memory from the instruction cache. */
if (prot & VM_PROT_EXECUTE)
sync++;
}
if (sync && (su || pmap == PCPU_GET(curpmap))) {
__syncicache((void *)va, PAGE_SIZE);
sync = 0;
}
if (sync) {
/* Create a temporary mapping. */
pmap = PCPU_GET(curpmap);
va = 0;
pte = pte_find(mmu, pmap, va);
KASSERT(pte == NULL, ("%s:%d", __func__, __LINE__));
flags = PTE_SR | PTE_VALID | PTE_UR;
pte_enter(mmu, pmap, m, va, flags);
__syncicache((void *)va, PAGE_SIZE);
pte_remove(mmu, pmap, va, PTBL_UNHOLD);
}
//debugf("mmu_booke_enter_locked: e\n");
}
/*
* Maps a sequence of resident pages belonging to the same object.
* The sequence begins with the given page m_start. This page is
* mapped at the given virtual address start. Each subsequent page is
* mapped at a virtual address that is offset from start by the same
* amount as the page is offset from m_start within the object. The
* last page in the sequence is the page with the largest offset from
* m_start that can be mapped at a virtual address less than the given
* virtual address end. Not every virtual page between start and end
* is mapped; only those for which a resident page exists with the
* corresponding offset from m_start are mapped.
*/
static void
mmu_booke_enter_object(mmu_t mmu, pmap_t pmap, vm_offset_t start,
vm_offset_t end, vm_page_t m_start, vm_prot_t prot)
{
vm_page_t m;
vm_pindex_t diff, psize;
psize = atop(end - start);
m = m_start;
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
mmu_booke_enter_locked(mmu, pmap, start + ptoa(diff), m, prot &
(VM_PROT_READ | VM_PROT_EXECUTE), FALSE);
m = TAILQ_NEXT(m, listq);
}
PMAP_UNLOCK(pmap);
}
static void
mmu_booke_enter_quick(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_prot_t prot)
{
//debugf("mmu_booke_enter_quick: s\n");
PMAP_LOCK(pmap);
mmu_booke_enter_locked(mmu, pmap, va, m,
prot & (VM_PROT_READ | VM_PROT_EXECUTE), FALSE);
PMAP_UNLOCK(pmap);
//debugf("mmu_booke_enter_quick e\n");
}
/*
* Remove the given range of addresses from the specified map.
*
* It is assumed that the start and end are properly rounded to the page size.
*/
static void
mmu_booke_remove(mmu_t mmu, pmap_t pmap, vm_offset_t va, vm_offset_t endva)
{
pte_t *pte;
u_int8_t hold_flag;
int su = (pmap == kernel_pmap);
//debugf("mmu_booke_remove: s (su = %d pmap=0x%08x tid=%d va=0x%08x endva=0x%08x)\n",
// su, (u_int32_t)pmap, pmap->pm_tid, va, endva);
if (su) {
KASSERT(((va >= virtual_avail) && (va <= VM_MAX_KERNEL_ADDRESS)),
("mmu_booke_enter: kernel pmap, non kernel va"));
} else {
KASSERT((va <= VM_MAXUSER_ADDRESS),
("mmu_booke_enter: user pmap, non user va"));
}
if (PMAP_REMOVE_DONE(pmap)) {
//debugf("mmu_booke_remove: e (empty)\n");
return;
}
hold_flag = PTBL_HOLD_FLAG(pmap);
//debugf("mmu_booke_remove: hold_flag = %d\n", hold_flag);
vm_page_lock_queues();
PMAP_LOCK(pmap);
for (; va < endva; va += PAGE_SIZE) {
pte = pte_find(mmu, pmap, va);
if ((pte != NULL) && PTE_ISVALID(pte)) {
pte_remove(mmu, pmap, va, hold_flag);
/* Flush mapping from TLB0. */
tlb0_flush_entry(pmap, va);
}
}
PMAP_UNLOCK(pmap);
vm_page_unlock_queues();
//debugf("mmu_booke_remove: e\n");
}
/*
* Remove physical page from all pmaps in which it resides.
*/
static void
mmu_booke_remove_all(mmu_t mmu, vm_page_t m)
{
pv_entry_t pv, pvn;
u_int8_t hold_flag;
//debugf("mmu_booke_remove_all: s\n");
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
for (pv = TAILQ_FIRST(&m->md.pv_list); pv != NULL; pv = pvn) {
pvn = TAILQ_NEXT(pv, pv_link);
PMAP_LOCK(pv->pv_pmap);
hold_flag = PTBL_HOLD_FLAG(pv->pv_pmap);
pte_remove(mmu, pv->pv_pmap, pv->pv_va, hold_flag);
/* Flush mapping from TLB0. */
tlb0_flush_entry(pv->pv_pmap, pv->pv_va);
PMAP_UNLOCK(pv->pv_pmap);
}
vm_page_flag_clear(m, PG_WRITEABLE);
//debugf("mmu_booke_remove_all: e\n");
}
/*
* Map a range of physical addresses into kernel virtual address space.
*
* The value passed in *virt is a suggested virtual address for the mapping.
* Architectures which can support a direct-mapped physical to virtual region
* can return the appropriate address within that region, leaving '*virt'
* unchanged. We cannot and therefore do not; *virt is updated with the
* first usable address after the mapped region.
*/
static vm_offset_t
mmu_booke_map(mmu_t mmu, vm_offset_t *virt, vm_offset_t pa_start,
vm_offset_t pa_end, int prot)
{
vm_offset_t sva = *virt;
vm_offset_t va = sva;
//debugf("mmu_booke_map: s (sva = 0x%08x pa_start = 0x%08x pa_end = 0x%08x)\n",
// sva, pa_start, pa_end);
while (pa_start < pa_end) {
mmu_booke_kenter(mmu, va, pa_start);
va += PAGE_SIZE;
pa_start += PAGE_SIZE;
}
*virt = va;
//debugf("mmu_booke_map: e (va = 0x%08x)\n", va);
return (sva);
}
/*
* The pmap must be activated before it's address space can be accessed in any
* way.
*/
static void
mmu_booke_activate(mmu_t mmu, struct thread *td)
{
pmap_t pmap;
pmap = &td->td_proc->p_vmspace->vm_pmap;
//debugf("mmu_booke_activate: s (proc = '%s', id = %d, pmap = 0x%08x)\n",
// td->td_proc->p_comm, td->td_proc->p_pid, pmap);
KASSERT((pmap != kernel_pmap), ("mmu_booke_activate: kernel_pmap!"));
mtx_lock_spin(&sched_lock);
pmap->pm_active |= PCPU_GET(cpumask);
PCPU_SET(curpmap, pmap);
if (!pmap->pm_tid)
tid_alloc(pmap);
/* Load PID0 register with pmap tid value. */
load_pid0(pmap->pm_tid);
mtx_unlock_spin(&sched_lock);
//debugf("mmu_booke_activate: e (tid = %d for '%s')\n", pmap->pm_tid,
// td->td_proc->p_comm);
}
/*
* Deactivate the specified process's address space.
*/
static void
mmu_booke_deactivate(mmu_t mmu, struct thread *td)
{
pmap_t pmap;
pmap = &td->td_proc->p_vmspace->vm_pmap;
pmap->pm_active &= ~(PCPU_GET(cpumask));
PCPU_SET(curpmap, NULL);
}
/*
* Copy the range specified by src_addr/len
* from the source map to the range dst_addr/len
* in the destination map.
*
* This routine is only advisory and need not do anything.
*/
static void
mmu_booke_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr,
vm_size_t len, vm_offset_t src_addr)
{
}
/*
* Set the physical protection on the specified range of this map as requested.
*/
static void
mmu_booke_protect(mmu_t mmu, pmap_t pmap, vm_offset_t sva, vm_offset_t eva,
vm_prot_t prot)
{
vm_offset_t va;
vm_page_t m;
pte_t *pte;
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
mmu_booke_remove(mmu, pmap, sva, eva);
return;
}
if (prot & VM_PROT_WRITE)
return;
vm_page_lock_queues();
PMAP_LOCK(pmap);
for (va = sva; va < eva; va += PAGE_SIZE) {
if ((pte = pte_find(mmu, pmap, va)) != NULL) {
if (PTE_ISVALID(pte)) {
m = PHYS_TO_VM_PAGE(PTE_PA(pte));
/* Handle modified pages. */
if (PTE_ISMODIFIED(pte))
vm_page_dirty(m);
/* Referenced pages. */
if (PTE_ISREFERENCED(pte))
vm_page_flag_set(m, PG_REFERENCED);
/* Flush mapping from TLB0. */
pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED |
PTE_REFERENCED);
tlb0_flush_entry(pmap, va);
}
}
}
PMAP_UNLOCK(pmap);
vm_page_unlock_queues();
}
/*
* Clear the write and modified bits in each of the given page's mappings.
*/
static void
mmu_booke_remove_write(mmu_t mmu, vm_page_t m)
{
pv_entry_t pv;
pte_t *pte;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0 ||
(m->flags & PG_WRITEABLE) == 0)
return;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL) {
if (PTE_ISVALID(pte)) {
m = PHYS_TO_VM_PAGE(PTE_PA(pte));
/* Handle modified pages. */
if (PTE_ISMODIFIED(pte))
vm_page_dirty(m);
/* Referenced pages. */
if (PTE_ISREFERENCED(pte))
vm_page_flag_set(m, PG_REFERENCED);
/* Flush mapping from TLB0. */
pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED |
PTE_REFERENCED);
tlb0_flush_entry(pv->pv_pmap, pv->pv_va);
}
}
PMAP_UNLOCK(pv->pv_pmap);
}
vm_page_flag_clear(m, PG_WRITEABLE);
}
static boolean_t
mmu_booke_page_executable(mmu_t mmu, vm_page_t m)
{
pv_entry_t pv;
pte_t *pte;
boolean_t executable;
executable = FALSE;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
pte = pte_find(mmu, pv->pv_pmap, pv->pv_va);
if (pte != NULL && PTE_ISVALID(pte) && (pte->flags & PTE_UX))
executable = TRUE;
PMAP_UNLOCK(pv->pv_pmap);
if (executable)
break;
}
return (executable);
}
/*
* Atomically extract and hold the physical page with the given
* pmap and virtual address pair if that mapping permits the given
* protection.
*/
static vm_page_t
mmu_booke_extract_and_hold(mmu_t mmu, pmap_t pmap, vm_offset_t va,
vm_prot_t prot)
{
pte_t *pte;
vm_page_t m;
u_int32_t pte_wbit;
m = NULL;
vm_page_lock_queues();
PMAP_LOCK(pmap);
pte = pte_find(mmu, pmap, va);
if ((pte != NULL) && PTE_ISVALID(pte)) {
if (pmap == kernel_pmap)
pte_wbit = PTE_SW;
else
pte_wbit = PTE_UW;
if ((pte->flags & pte_wbit) || ((prot & VM_PROT_WRITE) == 0)) {
m = PHYS_TO_VM_PAGE(PTE_PA(pte));
vm_page_hold(m);
}
}
vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
return (m);
}
/*
* Initialize a vm_page's machine-dependent fields.
*/
static void
mmu_booke_page_init(mmu_t mmu, vm_page_t m)
{
TAILQ_INIT(&m->md.pv_list);
}
/*
* mmu_booke_zero_page_area zeros the specified hardware page by
* mapping it into virtual memory and using bzero to clear
* its contents.
*
* off and size must reside within a single page.
*/
static void
mmu_booke_zero_page_area(mmu_t mmu, vm_page_t m, int off, int size)
{
vm_offset_t va;
//debugf("mmu_booke_zero_page_area: s\n");
mtx_lock(&zero_page_mutex);
va = zero_page_va;
mmu_booke_kenter(mmu, va, VM_PAGE_TO_PHYS(m));
bzero((caddr_t)va + off, size);
mmu_booke_kremove(mmu, va);
mtx_unlock(&zero_page_mutex);
//debugf("mmu_booke_zero_page_area: e\n");
}
/*
* mmu_booke_zero_page zeros the specified hardware page.
*/
static void
mmu_booke_zero_page(mmu_t mmu, vm_page_t m)
{
//debugf("mmu_booke_zero_page: s\n");
mmu_booke_zero_page_area(mmu, m, 0, PAGE_SIZE);
//debugf("mmu_booke_zero_page: e\n");
}
/*
* mmu_booke_copy_page copies the specified (machine independent) page by
* mapping the page into virtual memory and using memcopy to copy the page,
* one machine dependent page at a time.
*/
static void
mmu_booke_copy_page(mmu_t mmu, vm_page_t sm, vm_page_t dm)
{
vm_offset_t sva, dva;
//debugf("mmu_booke_copy_page: s\n");
mtx_lock(&copy_page_mutex);
sva = copy_page_src_va;
dva = copy_page_dst_va;
mmu_booke_kenter(mmu, sva, VM_PAGE_TO_PHYS(sm));
mmu_booke_kenter(mmu, dva, VM_PAGE_TO_PHYS(dm));
memcpy((caddr_t)dva, (caddr_t)sva, PAGE_SIZE);
mmu_booke_kremove(mmu, dva);
mmu_booke_kremove(mmu, sva);
mtx_unlock(&copy_page_mutex);
//debugf("mmu_booke_copy_page: e\n");
}
#if 0
/*
* Remove all pages from specified address space, this aids process exit
* speeds. This is much faster than mmu_booke_remove in the case of running
* down an entire address space. Only works for the current pmap.
*/
void
mmu_booke_remove_pages(pmap_t pmap)
{
}
#endif
/*
* mmu_booke_zero_page_idle zeros the specified hardware page by mapping it
* into virtual memory and using bzero to clear its contents. This is intended
* to be called from the vm_pagezero process only and outside of Giant. No
* lock is required.
*/
static void
mmu_booke_zero_page_idle(mmu_t mmu, vm_page_t m)
{
vm_offset_t va;
//debugf("mmu_booke_zero_page_idle: s\n");
va = zero_page_idle_va;
mmu_booke_kenter(mmu, va, VM_PAGE_TO_PHYS(m));
bzero((caddr_t)va, PAGE_SIZE);
mmu_booke_kremove(mmu, va);
//debugf("mmu_booke_zero_page_idle: e\n");
}
/*
* Return whether or not the specified physical page was modified
* in any of physical maps.
*/
static boolean_t
mmu_booke_is_modified(mmu_t mmu, vm_page_t m)
{
pte_t *pte;
pv_entry_t pv;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return (FALSE);
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL) {
if (!PTE_ISVALID(pte))
goto make_sure_to_unlock;
if (PTE_ISMODIFIED(pte)) {
PMAP_UNLOCK(pv->pv_pmap);
return (TRUE);
}
}
make_sure_to_unlock:
PMAP_UNLOCK(pv->pv_pmap);
}
return (FALSE);
}
/*
* Return whether or not the specified virtual address is elgible
* for prefault.
*/
static boolean_t
mmu_booke_is_prefaultable(mmu_t mmu, pmap_t pmap, vm_offset_t addr)
{
return (FALSE);
}
/*
* Clear the modify bits on the specified physical page.
*/
static void
mmu_booke_clear_modify(mmu_t mmu, vm_page_t m)
{
pte_t *pte;
pv_entry_t pv;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL) {
if (!PTE_ISVALID(pte))
goto make_sure_to_unlock;
if (pte->flags & (PTE_SW | PTE_UW | PTE_MODIFIED)) {
pte->flags &= ~(PTE_SW | PTE_UW | PTE_MODIFIED |
PTE_REFERENCED);
tlb0_flush_entry(pv->pv_pmap, pv->pv_va);
}
}
make_sure_to_unlock:
PMAP_UNLOCK(pv->pv_pmap);
}
}
/*
* Return a count of reference bits for a page, clearing those bits.
* It is not necessary for every reference bit to be cleared, but it
* is necessary that 0 only be returned when there are truly no
* reference bits set.
*
* XXX: The exact number of bits to check and clear is a matter that
* should be tested and standardized at some point in the future for
* optimal aging of shared pages.
*/
static int
mmu_booke_ts_referenced(mmu_t mmu, vm_page_t m)
{
pte_t *pte;
pv_entry_t pv;
int count;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return (0);
count = 0;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL) {
if (!PTE_ISVALID(pte))
goto make_sure_to_unlock;
if (PTE_ISREFERENCED(pte)) {
pte->flags &= ~PTE_REFERENCED;
tlb0_flush_entry(pv->pv_pmap, pv->pv_va);
if (++count > 4) {
PMAP_UNLOCK(pv->pv_pmap);
break;
}
}
}
make_sure_to_unlock:
PMAP_UNLOCK(pv->pv_pmap);
}
return (count);
}
/*
* Clear the reference bit on the specified physical page.
*/
static void
mmu_booke_clear_reference(mmu_t mmu, vm_page_t m)
{
pte_t *pte;
pv_entry_t pv;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL) {
if (!PTE_ISVALID(pte))
goto make_sure_to_unlock;
if (PTE_ISREFERENCED(pte)) {
pte->flags &= ~PTE_REFERENCED;
tlb0_flush_entry(pv->pv_pmap, pv->pv_va);
}
}
make_sure_to_unlock:
PMAP_UNLOCK(pv->pv_pmap);
}
}
/*
* Change wiring attribute for a map/virtual-address pair.
*/
static void
mmu_booke_change_wiring(mmu_t mmu, pmap_t pmap, vm_offset_t va, boolean_t wired)
{
pte_t *pte;;
PMAP_LOCK(pmap);
if ((pte = pte_find(mmu, pmap, va)) != NULL) {
if (wired) {
if (!PTE_ISWIRED(pte)) {
pte->flags |= PTE_WIRED;
pmap->pm_stats.wired_count++;
}
} else {
if (PTE_ISWIRED(pte)) {
pte->flags &= ~PTE_WIRED;
pmap->pm_stats.wired_count--;
}
}
}
PMAP_UNLOCK(pmap);
}
/*
* Return true if the pmap's pv is one of the first 16 pvs linked to from this
* page. This count may be changed upwards or downwards in the future; it is
* only necessary that true be returned for a small subset of pmaps for proper
* page aging.
*/
static boolean_t
mmu_booke_page_exists_quick(mmu_t mmu, pmap_t pmap, vm_page_t m)
{
pv_entry_t pv;
int loops;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return (FALSE);
loops = 0;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
if (pv->pv_pmap == pmap)
return (TRUE);
if (++loops >= 16)
break;
}
return (FALSE);
}
/*
* Return the number of managed mappings to the given physical page that are
* wired.
*/
static int
mmu_booke_page_wired_mappings(mmu_t mmu, vm_page_t m)
{
pv_entry_t pv;
pte_t *pte;
int count = 0;
if ((m->flags & PG_FICTITIOUS) != 0)
return (count);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL)
if (PTE_ISVALID(pte) && PTE_ISWIRED(pte))
count++;
PMAP_UNLOCK(pv->pv_pmap);
}
return (count);
}
static int
mmu_booke_dev_direct_mapped(mmu_t mmu, vm_offset_t pa, vm_size_t size)
{
int i;
vm_offset_t va;
/*
* This currently does not work for entries that
* overlap TLB1 entries.
*/
for (i = 0; i < tlb1_idx; i ++) {
if (tlb1_iomapped(i, pa, size, &va) == 0)
return (0);
}
return (EFAULT);
}
/*
* Map a set of physical memory pages into the kernel virtual address space.
* Return a pointer to where it is mapped. This routine is intended to be used
* for mapping device memory, NOT real memory.
*/
static void *
mmu_booke_mapdev(mmu_t mmu, vm_offset_t pa, vm_size_t size)
{
uintptr_t va;
va = (pa >= 0x80000000) ? pa : (0xe2000000 + pa);
if (bootverbose)
printf("Wiring VA=%x to PA=%x (size=%x), using TLB1[%d]\n",
va, pa, size, tlb1_idx);
tlb1_set_entry(va, pa, size, _TLB_ENTRY_IO);
return ((void *)va);
}
/*
* 'Unmap' a range mapped by mmu_booke_mapdev().
*/
static void
mmu_booke_unmapdev(mmu_t mmu, vm_offset_t va, vm_size_t size)
{
vm_offset_t base, offset;
//debugf("mmu_booke_unmapdev: s (va = 0x%08x)\n", va);
/*
* Unmap only if this is inside kernel virtual space.
*/
if ((va >= VM_MIN_KERNEL_ADDRESS) && (va <= VM_MAX_KERNEL_ADDRESS)) {
base = trunc_page(va);
offset = va & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);
kmem_free(kernel_map, base, size);
}
//debugf("mmu_booke_unmapdev: e\n");
}
/*
* mmu_booke_object_init_pt preloads the ptes for a given object
* into the specified pmap. This eliminates the blast of soft
* faults on process startup and immediately after an mmap.
*/
static void
mmu_booke_object_init_pt(mmu_t mmu, pmap_t pmap, vm_offset_t addr,
vm_object_t object, vm_pindex_t pindex, vm_size_t size)
{
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
KASSERT(object->type == OBJT_DEVICE,
("mmu_booke_object_init_pt: non-device object"));
}
/*
* Perform the pmap work for mincore.
*/
static int
mmu_booke_mincore(mmu_t mmu, pmap_t pmap, vm_offset_t addr)
{
TODO;
return (0);
}
static vm_offset_t
mmu_booke_addr_hint(mmu_t mmu, vm_object_t object, vm_offset_t va,
vm_size_t size)
{
return (va);
}
/**************************************************************************/
/* TID handling */
/**************************************************************************/
/*
* Flush all entries from TLB0 matching given tid.
*/
static void
tid_flush(tlbtid_t tid)
{
int i, entryidx, way;
//debugf("tid_flush: s (tid = %d)\n", tid);
mtx_lock_spin(&tlb0_mutex);
for (i = 0; i < TLB0_SIZE; i++) {
if (MAS1_GETTID(tlb0[i].mas1) == tid) {
way = i / TLB0_ENTRIES_PER_WAY;
entryidx = i - (way * TLB0_ENTRIES_PER_WAY);
//debugf("tid_flush: inval tlb0 entry %d\n", i);
tlb0_inval_entry(entryidx << MAS2_TLB0_ENTRY_IDX_SHIFT, way);
}
}
mtx_unlock_spin(&tlb0_mutex);
//debugf("tid_flush: e\n");
}
/*
* Allocate a TID. If necessary, steal one from someone else.
* The new TID is flushed from the TLB before returning.
*/
static tlbtid_t
tid_alloc(pmap_t pmap)
{
tlbtid_t tid;
static tlbtid_t next_tid = TID_MIN;
//struct thread *td;
//struct proc *p;
//td = PCPU_GET(curthread);
//p = td->td_proc;
//debugf("tid_alloc: s (pmap = 0x%08x)\n", (u_int32_t)pmap);
//printf("tid_alloc: proc %d '%s'\n", p->p_pid, p->p_comm);
KASSERT((pmap != kernel_pmap), ("tid_alloc: kernel pmap"));
/*
* Find a likely TID, allocate unused if possible,
* skip reserved entries.
*/
tid = next_tid;
while (tidbusy[tid] != NULL) {
if (tid == next_tid)
break;
if (tid == TID_MAX)
tid = TID_MIN;
else
tid++;
}
/* Now clean it out */
tid_flush(tid);
/* If we are stealing pmap then clear its tid */
if (tidbusy[tid]) {
//debugf("warning: stealing tid %d\n", tid);
tidbusy[tid]->pm_tid = 0;
}
/* Calculate next tid */
if (tid == TID_MAX)
next_tid = TID_MIN;
else
next_tid = tid + 1;
tidbusy[tid] = pmap;
pmap->pm_tid = tid;
//debugf("tid_alloc: e (%02d next = %02d)\n", tid, next_tid);
return (tid);
}
#if 0
/*
* Free this pmap's TID.
*/
static void
tid_free(pmap_t pmap)
{
tlbtid_t oldtid;
oldtid = pmap->pm_tid;
if (oldtid == 0) {
panic("tid_free: freeing kernel tid");
}
#ifdef DEBUG
if (tidbusy[oldtid] == 0)
debugf("tid_free: freeing free tid %d\n", oldtid);
if (tidbusy[oldtid] != pmap) {
debugf("tid_free: freeing someone esle's tid\n "
"tidbusy[%d] = 0x%08x pmap = 0x%08x\n",
oldtid, (u_int32_t)tidbusy[oldtid], (u_int32_t)pmap);
}
#endif
tidbusy[oldtid] = NULL;
tid_flush(oldtid);
}
#endif
#if 0
#if DEBUG
static void
tid_print_busy(void)
{
int i;
for (i = 0; i < TID_MAX; i++) {
debugf("tid %d = pmap 0x%08x", i, (u_int32_t)tidbusy[i]);
if (tidbusy[i])
debugf(" pmap->tid = %d", tidbusy[i]->pm_tid);
debugf("\n");
}
}
#endif /* DEBUG */
#endif
/**************************************************************************/
/* TLB0 handling */
/**************************************************************************/
static void
tlb_print_entry(int i, u_int32_t mas1, u_int32_t mas2, u_int32_t mas3, u_int32_t mas7)
{
int as;
char desc[3];
tlbtid_t tid;
vm_size_t size;
unsigned int tsize;
desc[2] = '\0';
if (mas1 & MAS1_VALID)
desc[0] = 'V';
else
desc[0] = ' ';
if (mas1 & MAS1_IPROT)
desc[1] = 'P';
else
desc[1] = ' ';
as = (mas1 & MAS1_TS) ? 1 : 0;
tid = MAS1_GETTID(mas1);
tsize = (mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
size = 0;
if (tsize)
size = tsize2size(tsize);
debugf("%3d: (%s) [AS=%d] "
"sz = 0x%08x tsz = %d tid = %d mas1 = 0x%08x "
"mas2(va) = 0x%08x mas3(pa) = 0x%08x mas7 = 0x%08x\n",
i, desc, as, size, tsize, tid, mas1, mas2, mas3, mas7);
}
/* Convert TLB0 va and way number to tlb0[] table index. */
static inline unsigned int
tlb0_tableidx(vm_offset_t va, unsigned int way)
{
unsigned int idx;
idx = (way * TLB0_ENTRIES_PER_WAY);
idx += (va & MAS2_TLB0_ENTRY_IDX_MASK) >> MAS2_TLB0_ENTRY_IDX_SHIFT;
return (idx);
}
/*
* Write given entry to TLB0 hardware.
* Use 32 bit pa, clear 4 high-order bits of RPN (mas7).
*/
static void
tlb0_write_entry(unsigned int idx, unsigned int way)
{
u_int32_t mas0, mas7, nv;
/* Clear high order RPN bits. */
mas7 = 0;
/* Preserve NV. */
mas0 = mfspr(SPR_MAS0);
nv = mas0 & (TLB0_NWAYS - 1);
/* Select entry. */
mas0 = MAS0_TLBSEL(0) | MAS0_ESEL(way) | nv;
//debugf("tlb0_write_entry: s (idx=%d way=%d mas0=0x%08x "
// "mas1=0x%08x mas2=0x%08x mas3=0x%08x)\n",
// idx, way, mas0, tlb0[idx].mas1,
// tlb0[idx].mas2, tlb0[idx].mas3);
mtspr(SPR_MAS0, mas0);
__asm volatile("isync");
mtspr(SPR_MAS1, tlb0[idx].mas1);
__asm volatile("isync");
mtspr(SPR_MAS2, tlb0[idx].mas2);
__asm volatile("isync");
mtspr(SPR_MAS3, tlb0[idx].mas3);
__asm volatile("isync");
mtspr(SPR_MAS7, mas7);
__asm volatile("isync; tlbwe; isync; msync");
//debugf("tlb0_write_entry: e\n");
}
/*
* Invalidate TLB0 entry, clear correspondig tlb0 table element.
*/
static void
tlb0_inval_entry(vm_offset_t va, unsigned int way)
{
int idx = tlb0_tableidx(va, way);
//debugf("tlb0_inval_entry: s (va=0x%08x way=%d idx=%d)\n",
// va, way, idx);
tlb0[idx].mas1 = 1 << MAS1_TSIZE_SHIFT; /* !MAS1_VALID */
tlb0[idx].mas2 = va & MAS2_EPN;
tlb0[idx].mas3 = 0;
tlb0_write_entry(idx, way);
//debugf("tlb0_inval_entry: e\n");
}
/*
* Invalidate TLB0 entry that corresponds to pmap/va.
*/
static void
tlb0_flush_entry(pmap_t pmap, vm_offset_t va)
{
int idx, way;
//debugf("tlb0_flush_entry: s (pmap=0x%08x va=0x%08x)\n",
// (u_int32_t)pmap, va);
mtx_lock_spin(&tlb0_mutex);
/* Check all TLB0 ways. */
for (way = 0; way < TLB0_NWAYS; way ++) {
idx = tlb0_tableidx(va, way);
/* Invalidate only if entry matches va and pmap tid. */
if (((MAS1_GETTID(tlb0[idx].mas1) == pmap->pm_tid) &&
((tlb0[idx].mas2 & MAS2_EPN) == va))) {
tlb0_inval_entry(va, way);
}
}
mtx_unlock_spin(&tlb0_mutex);
//debugf("tlb0_flush_entry: e\n");
}
/* Clean TLB0 hardware and tlb0[] table. */
static void
tlb0_init(void)
{
int entryidx, way;
debugf("tlb0_init: TLB0_SIZE = %d TLB0_NWAYS = %d\n",
TLB0_SIZE, TLB0_NWAYS);
mtx_lock_spin(&tlb0_mutex);
for (way = 0; way < TLB0_NWAYS; way ++) {
for (entryidx = 0; entryidx < TLB0_ENTRIES_PER_WAY; entryidx++) {
tlb0_inval_entry(entryidx << MAS2_TLB0_ENTRY_IDX_SHIFT, way);
}
}
mtx_unlock_spin(&tlb0_mutex);
}
#if 0
#if DEBUG
/* Print out tlb0 entries for given va. */
static void
tlb0_print_tlbentries_va(vm_offset_t va)
{
u_int32_t mas0, mas1, mas2, mas3, mas7;
int way, idx;
debugf("TLB0 entries for va = 0x%08x:\n", va);
for (way = 0; way < TLB0_NWAYS; way ++) {
mas0 = MAS0_TLBSEL(0) | MAS0_ESEL(way);
mtspr(SPR_MAS0, mas0);
__asm volatile("isync");
mas2 = va & MAS2_EPN;
mtspr(SPR_MAS2, mas2);
__asm volatile("isync; tlbre");
mas1 = mfspr(SPR_MAS1);
mas2 = mfspr(SPR_MAS2);
mas3 = mfspr(SPR_MAS3);
mas7 = mfspr(SPR_MAS7);
idx = tlb0_tableidx(va, way);
tlb_print_entry(idx, mas1, mas2, mas3, mas7);
}
}
/* Print out contents of the MAS registers for each TLB0 entry */
static void
tlb0_print_tlbentries(void)
{
u_int32_t mas0, mas1, mas2, mas3, mas7;
int entryidx, way, idx;
debugf("TLB0 entries:\n");
for (way = 0; way < TLB0_NWAYS; way ++) {
for (entryidx = 0; entryidx < TLB0_ENTRIES_PER_WAY; entryidx++) {
mas0 = MAS0_TLBSEL(0) | MAS0_ESEL(way);
mtspr(SPR_MAS0, mas0);
__asm volatile("isync");
mas2 = entryidx << MAS2_TLB0_ENTRY_IDX_SHIFT;
mtspr(SPR_MAS2, mas2);
__asm volatile("isync; tlbre");
mas1 = mfspr(SPR_MAS1);
mas2 = mfspr(SPR_MAS2);
mas3 = mfspr(SPR_MAS3);
mas7 = mfspr(SPR_MAS7);
idx = tlb0_tableidx(mas2, way);
tlb_print_entry(idx, mas1, mas2, mas3, mas7);
}
}
}
/* Print out kernel tlb0[] table. */
static void
tlb0_print_entries(void)
{
int i;
debugf("tlb0[] table entries:\n");
for (i = 0; i < TLB0_SIZE; i++) {
tlb_print_entry(i, tlb0[i].mas1,
tlb0[i].mas2, tlb0[i].mas3, 0);
}
}
#endif /* DEBUG */
#endif
/**************************************************************************/
/* TLB1 handling */
/**************************************************************************/
/*
* Write given entry to TLB1 hardware.
* Use 32 bit pa, clear 4 high-order bits of RPN (mas7).
*/
static void
tlb1_write_entry(unsigned int idx)
{
u_int32_t mas0, mas7;
//debugf("tlb1_write_entry: s\n");
/* Clear high order RPN bits */
mas7 = 0;
/* Select entry */
mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(idx);
//debugf("tlb1_write_entry: mas0 = 0x%08x\n", mas0);
mtspr(SPR_MAS0, mas0);
__asm volatile("isync");
mtspr(SPR_MAS1, tlb1[idx].mas1);
__asm volatile("isync");
mtspr(SPR_MAS2, tlb1[idx].mas2);
__asm volatile("isync");
mtspr(SPR_MAS3, tlb1[idx].mas3);
__asm volatile("isync");
mtspr(SPR_MAS7, mas7);
__asm volatile("isync; tlbwe; isync; msync");
//debugf("tlb1_write_entry: e\n");;
}
/*
* Return the largest uint value log such that 2^log <= num.
*/
static unsigned int
ilog2(unsigned int num)
{
int lz;
__asm ("cntlzw %0, %1" : "=r" (lz) : "r" (num));
return (31 - lz);
}
/*
* Convert TLB TSIZE value to mapped region size.
*/
static vm_size_t
tsize2size(unsigned int tsize)
{
/*
* size = 4^tsize KB
* size = 4^tsize * 2^10 = 2^(2 * tsize - 10)
*/
return ((1 << (2 * tsize)) * 1024);
}
/*
* Convert region size (must be power of 4) to TLB TSIZE value.
*/
static unsigned int
size2tsize(vm_size_t size)
{
/*
* tsize = log2(size) / 2 - 5
*/
return (ilog2(size) / 2 - 5);
}
/*
* Setup entry in a sw tlb1 table, write entry to TLB1 hardware.
* This routine is used for low level operations on the TLB1,
* for creating temporaray as well as permanent mappings (tlb_set_entry).
*
* We assume kernel mappings only, thus all entries created have supervisor
* permission bits set nad user permission bits cleared.
*
* Provided mapping size must be a power of 4.
* Mapping flags must be a combination of MAS2_[WIMG].
* Entry TID is set to _tid which must not exceed 8 bit value.
* Entry TS is set to either 0 or MAS1_TS based on provided _ts.
*/
static void
__tlb1_set_entry(unsigned int idx, vm_offset_t va, vm_offset_t pa,
vm_size_t size, u_int32_t flags, unsigned int _tid, unsigned int _ts)
{
int tsize;
u_int32_t ts, tid;
//debugf("__tlb1_set_entry: s (idx = %d va = 0x%08x pa = 0x%08x "
// "size = 0x%08x flags = 0x%08x _tid = %d _ts = %d\n",
// idx, va, pa, size, flags, _tid, _ts);
/* Convert size to TSIZE */
tsize = size2tsize(size);
//debugf("__tlb1_set_entry: tsize = %d\n", tsize);
tid = (_tid << MAS1_TID_SHIFT) & MAS1_TID_MASK;
ts = (_ts) ? MAS1_TS : 0;
tlb1[idx].mas1 = MAS1_VALID | MAS1_IPROT | ts | tid;
tlb1[idx].mas1 |= ((tsize << MAS1_TSIZE_SHIFT) & MAS1_TSIZE_MASK);
tlb1[idx].mas2 = (va & MAS2_EPN) | flags;
/* Set supervisor rwx permission bits */
tlb1[idx].mas3 = (pa & MAS3_RPN) | MAS3_SR | MAS3_SW | MAS3_SX;
//debugf("__tlb1_set_entry: mas1 = %08x mas2 = %08x mas3 = 0x%08x\n",
// tlb1[idx].mas1, tlb1[idx].mas2, tlb1[idx].mas3);
tlb1_write_entry(idx);
//debugf("__tlb1_set_entry: e\n");
}
/*
* Register permanent kernel mapping in TLB1.
*
* Entries are created starting from index 0 (current free entry is
* kept in tlb1_idx) and are not supposed to be invalidated.
*/
static int
tlb1_set_entry(vm_offset_t va, vm_offset_t pa, vm_size_t size, u_int32_t flags)
{
//debugf("tlb1_set_entry: s (tlb1_idx = %d va = 0x%08x pa = 0x%08x "
// "size = 0x%08x flags = 0x%08x\n",
// tlb1_idx, va, pa, size, flags);
if (tlb1_idx >= TLB1_SIZE) {
//debugf("tlb1_set_entry: e (tlb1 full!)\n");
return (-1);
}
/* TS = 0, TID = 0 */
__tlb1_set_entry(tlb1_idx++, va, pa, size, flags, KERNEL_TID, 0);
//debugf("tlb1_set_entry: e\n");
return (0);
}
/*
* Invalidate TLB1 entry, clear correspondig tlb1 table element.
* This routine is used to clear temporary entries created
* early in a locore.S or through the use of __tlb1_set_entry().
*/
void
tlb1_inval_entry(unsigned int idx)
{
vm_offset_t va;
va = tlb1[idx].mas2 & MAS2_EPN;
tlb1[idx].mas1 = 0; /* !MAS1_VALID */
tlb1[idx].mas2 = 0;
tlb1[idx].mas3 = 0;
tlb1_write_entry(idx);
}
static int
tlb1_entry_size_cmp(const void *a, const void *b)
{
const vm_size_t *sza;
const vm_size_t *szb;
sza = a;
szb = b;
if (*sza > *szb)
return (-1);
else if (*sza < *szb)
return (1);
else
return (0);
}
/*
* Mapin contiguous RAM region into the TLB1 using maximum of
* KERNEL_REGION_MAX_TLB_ENTRIES entries.
*
* If necessarry round up last entry size and return total size
* used by all allocated entries.
*/
vm_size_t
tlb1_mapin_region(vm_offset_t va, vm_offset_t pa, vm_size_t size)
{
vm_size_t entry_size[KERNEL_REGION_MAX_TLB_ENTRIES];
vm_size_t mapped_size, sz, esz;
unsigned int log;
int i;
debugf("tlb1_mapin_region:\n");
debugf(" region size = 0x%08x va = 0x%08x pa = 0x%08x\n", size, va, pa);
mapped_size = 0;
sz = size;
memset(entry_size, 0, sizeof(entry_size));
/* Calculate entry sizes. */
for (i = 0; i < KERNEL_REGION_MAX_TLB_ENTRIES && sz > 0; i++) {
/* Largest region that is power of 4 and fits within size */
log = ilog2(sz)/2;
esz = 1 << (2 * log);
/* Minimum region size is 4KB */
if (esz < (1 << 12))
esz = 1 << 12;
/* If this is last entry cover remaining size. */
if (i == KERNEL_REGION_MAX_TLB_ENTRIES - 1) {
while (esz < sz)
esz = esz << 2;
}
entry_size[i] = esz;
mapped_size += esz;
if (esz < sz)
sz -= esz;
else
sz = 0;
}
/* Sort entry sizes, required to get proper entry address alignment. */
qsort(entry_size, KERNEL_REGION_MAX_TLB_ENTRIES,
sizeof(vm_size_t), tlb1_entry_size_cmp);
/* Load TLB1 entries. */
for (i = 0; i < KERNEL_REGION_MAX_TLB_ENTRIES; i++) {
esz = entry_size[i];
if (!esz)
break;
debugf(" entry %d: sz = 0x%08x (va = 0x%08x pa = 0x%08x)\n",
tlb1_idx, esz, va, pa);
tlb1_set_entry(va, pa, esz, _TLB_ENTRY_MEM);
va += esz;
pa += esz;
}
debugf(" mapped size 0x%08x (wasted space 0x%08x)\n",
mapped_size, mapped_size - size);
return (mapped_size);
}
/*
* TLB1 initialization routine, to be called after the very first
* assembler level setup done in locore.S.
*/
void
tlb1_init(vm_offset_t ccsrbar)
{
uint32_t mas0;
/* TBL1[1] is used to map the kernel. Save that entry. */
mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(1);
mtspr(SPR_MAS0, mas0);
__asm __volatile("isync; tlbre");
tlb1[1].mas1 = mfspr(SPR_MAS1);
tlb1[1].mas2 = mfspr(SPR_MAS2);
tlb1[1].mas3 = mfspr(SPR_MAS3);
/* Mapin CCSRBAR in TLB1[0] */
__tlb1_set_entry(0, CCSRBAR_VA, ccsrbar, CCSRBAR_SIZE,
_TLB_ENTRY_IO, KERNEL_TID, 0);
/* Setup TLB miss defaults */
set_mas4_defaults();
/* Reset next available TLB1 entry index. */
tlb1_idx = 2;
}
/*
* Setup MAS4 defaults.
* These values are loaded to MAS0-2 on a TLB miss.
*/
static void
set_mas4_defaults(void)
{
u_int32_t mas4;
/* Defaults: TLB0, PID0, TSIZED=4K */
mas4 = MAS4_TLBSELD0;
mas4 |= (TLB_SIZE_4K << MAS4_TSIZED_SHIFT) & MAS4_TSIZED_MASK;
mtspr(SPR_MAS4, mas4);
__asm volatile("isync");
}
/*
* Print out contents of the MAS registers for each TLB1 entry
*/
void
tlb1_print_tlbentries(void)
{
u_int32_t mas0, mas1, mas2, mas3, mas7;
int i;
debugf("TLB1 entries:\n");
for (i = 0; i < TLB1_SIZE; i++) {
mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(i);
mtspr(SPR_MAS0, mas0);
__asm volatile("isync; tlbre");
mas1 = mfspr(SPR_MAS1);
mas2 = mfspr(SPR_MAS2);
mas3 = mfspr(SPR_MAS3);
mas7 = mfspr(SPR_MAS7);
tlb_print_entry(i, mas1, mas2, mas3, mas7);
}
}
/*
* Print out contents of the in-ram tlb1 table.
*/
void
tlb1_print_entries(void)
{
int i;
debugf("tlb1[] table entries:\n");
for (i = 0; i < TLB1_SIZE; i++)
tlb_print_entry(i, tlb1[i].mas1, tlb1[i].mas2, tlb1[i].mas3, 0);
}
/*
* Return 0 if the physical IO range is encompassed by one of the
* the TLB1 entries, otherwise return related error code.
*/
static int
tlb1_iomapped(int i, vm_paddr_t pa, vm_size_t size, vm_offset_t *va)
{
u_int32_t prot;
vm_paddr_t pa_start;
vm_paddr_t pa_end;
unsigned int entry_tsize;
vm_size_t entry_size;
*va = (vm_offset_t)NULL;
/* Skip invalid entries */
if (!(tlb1[i].mas1 & MAS1_VALID))
return (EINVAL);
/*
* The entry must be cache-inhibited, guarded, and r/w
* so it can function as an i/o page
*/
prot = tlb1[i].mas2 & (MAS2_I | MAS2_G);
if (prot != (MAS2_I | MAS2_G))
return (EPERM);
prot = tlb1[i].mas3 & (MAS3_SR | MAS3_SW);
if (prot != (MAS3_SR | MAS3_SW))
return (EPERM);
/* The address should be within the entry range. */
entry_tsize = (tlb1[i].mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
KASSERT((entry_tsize), ("tlb1_iomapped: invalid entry tsize"));
entry_size = tsize2size(entry_tsize);
pa_start = tlb1[i].mas3 & MAS3_RPN;
pa_end = pa_start + entry_size - 1;
if ((pa < pa_start) || ((pa + size) > pa_end))
return (ERANGE);
/* Return virtual address of this mapping. */
*va = (tlb1[i].mas2 & MAS2_EPN) + (pa - pa_start);
return (0);
}
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