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freebsd-nq/sys/powerpc/aim/mmu_oea.c
Peter Grehan 22f2fe59b9 Correctly initialise the 2nd kernel segment, and don't 
forget to actually install it in the segment register.
This may fix some of the weird panics seen when kernel VM
is heavily used.
2004-12-29 09:41:40 +00:00

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/*
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas <matt@3am-software.com> of Allegro Networks, Inc.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*
* $NetBSD: pmap.c,v 1.28 2000/03/26 20:42:36 kleink Exp $
*/
/*
* Copyright (C) 2001 Benno Rice.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Manages physical address maps.
*
* In addition to hardware address maps, this module is called upon to
* provide software-use-only maps which may or may not be stored in the
* same form as hardware maps. These pseudo-maps are used to store
* intermediate results from copy operations to and from address spaces.
*
* Since the information managed by this module is also stored by the
* logical address mapping module, this module may throw away valid virtual
* to physical mappings at almost any time. However, invalidations of
* mappings must be done as requested.
*
* In order to cope with hardware architectures which make virtual to
* physical map invalidates expensive, this module may delay invalidate
* reduced protection operations until such time as they are actually
* necessary. This module is given full information as to which processors
* are currently using which maps, and to when physical maps must be made
* correct.
*/
#include "opt_kstack_pages.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/msgbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/vmmeter.h>
#include <dev/ofw/openfirm.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>
#include <vm/uma.h>
#include <machine/cpu.h>
#include <machine/powerpc.h>
#include <machine/bat.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <machine/psl.h>
#include <machine/pte.h>
#include <machine/sr.h>
#define PMAP_DEBUG
#define TODO panic("%s: not implemented", __func__);
#define TLBIE(va) __asm __volatile("tlbie %0" :: "r"(va))
#define TLBSYNC() __asm __volatile("tlbsync");
#define SYNC() __asm __volatile("sync");
#define EIEIO() __asm __volatile("eieio");
#define VSID_MAKE(sr, hash) ((sr) | (((hash) & 0xfffff) << 4))
#define VSID_TO_SR(vsid) ((vsid) & 0xf)
#define VSID_TO_HASH(vsid) (((vsid) >> 4) & 0xfffff)
#define PVO_PTEGIDX_MASK 0x0007 /* which PTEG slot */
#define PVO_PTEGIDX_VALID 0x0008 /* slot is valid */
#define PVO_WIRED 0x0010 /* PVO entry is wired */
#define PVO_MANAGED 0x0020 /* PVO entry is managed */
#define PVO_EXECUTABLE 0x0040 /* PVO entry is executable */
#define PVO_BOOTSTRAP 0x0080 /* PVO entry allocated during
bootstrap */
#define PVO_VADDR(pvo) ((pvo)->pvo_vaddr & ~ADDR_POFF)
#define PVO_ISEXECUTABLE(pvo) ((pvo)->pvo_vaddr & PVO_EXECUTABLE)
#define PVO_PTEGIDX_GET(pvo) ((pvo)->pvo_vaddr & PVO_PTEGIDX_MASK)
#define PVO_PTEGIDX_ISSET(pvo) ((pvo)->pvo_vaddr & PVO_PTEGIDX_VALID)
#define PVO_PTEGIDX_CLR(pvo) \
((void)((pvo)->pvo_vaddr &= ~(PVO_PTEGIDX_VALID|PVO_PTEGIDX_MASK)))
#define PVO_PTEGIDX_SET(pvo, i) \
((void)((pvo)->pvo_vaddr |= (i)|PVO_PTEGIDX_VALID))
#define PMAP_PVO_CHECK(pvo)
struct ofw_map {
vm_offset_t om_va;
vm_size_t om_len;
vm_offset_t om_pa;
u_int om_mode;
};
int pmap_bootstrapped = 0;
/*
* Virtual and physical address of message buffer.
*/
struct msgbuf *msgbufp;
vm_offset_t msgbuf_phys;
int pmap_pagedaemon_waken;
/*
* Map of physical memory regions.
*/
vm_offset_t phys_avail[128];
u_int phys_avail_count;
static struct mem_region *regions;
static struct mem_region *pregions;
int regions_sz, pregions_sz;
static struct ofw_map *translations;
/*
* First and last available kernel virtual addresses.
*/
vm_offset_t virtual_avail;
vm_offset_t virtual_end;
vm_offset_t kernel_vm_end;
/*
* Kernel pmap.
*/
struct pmap kernel_pmap_store;
extern struct pmap ofw_pmap;
/*
* Lock for the pteg and pvo tables.
*/
struct mtx pmap_table_mutex;
/*
* PTEG data.
*/
static struct pteg *pmap_pteg_table;
u_int pmap_pteg_count;
u_int pmap_pteg_mask;
/*
* PVO data.
*/
struct pvo_head *pmap_pvo_table; /* pvo entries by pteg index */
struct pvo_head pmap_pvo_kunmanaged =
LIST_HEAD_INITIALIZER(pmap_pvo_kunmanaged); /* list of unmanaged pages */
struct pvo_head pmap_pvo_unmanaged =
LIST_HEAD_INITIALIZER(pmap_pvo_unmanaged); /* list of unmanaged pages */
uma_zone_t pmap_upvo_zone; /* zone for pvo entries for unmanaged pages */
uma_zone_t pmap_mpvo_zone; /* zone for pvo entries for managed pages */
#define BPVO_POOL_SIZE 32768
static struct pvo_entry *pmap_bpvo_pool;
static int pmap_bpvo_pool_index = 0;
#define VSID_NBPW (sizeof(u_int32_t) * 8)
static u_int pmap_vsid_bitmap[NPMAPS / VSID_NBPW];
static boolean_t pmap_initialized = FALSE;
/*
* Statistics.
*/
u_int pmap_pte_valid = 0;
u_int pmap_pte_overflow = 0;
u_int pmap_pte_replacements = 0;
u_int pmap_pvo_entries = 0;
u_int pmap_pvo_enter_calls = 0;
u_int pmap_pvo_remove_calls = 0;
u_int pmap_pte_spills = 0;
SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_valid, CTLFLAG_RD, &pmap_pte_valid,
0, "");
SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_overflow, CTLFLAG_RD,
&pmap_pte_overflow, 0, "");
SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_replacements, CTLFLAG_RD,
&pmap_pte_replacements, 0, "");
SYSCTL_INT(_machdep, OID_AUTO, pmap_pvo_entries, CTLFLAG_RD, &pmap_pvo_entries,
0, "");
SYSCTL_INT(_machdep, OID_AUTO, pmap_pvo_enter_calls, CTLFLAG_RD,
&pmap_pvo_enter_calls, 0, "");
SYSCTL_INT(_machdep, OID_AUTO, pmap_pvo_remove_calls, CTLFLAG_RD,
&pmap_pvo_remove_calls, 0, "");
SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_spills, CTLFLAG_RD,
&pmap_pte_spills, 0, "");
struct pvo_entry *pmap_pvo_zeropage;
vm_offset_t pmap_rkva_start = VM_MIN_KERNEL_ADDRESS;
u_int pmap_rkva_count = 4;
/*
* Allocate physical memory for use in pmap_bootstrap.
*/
static vm_offset_t pmap_bootstrap_alloc(vm_size_t, u_int);
/*
* PTE calls.
*/
static int pmap_pte_insert(u_int, struct pte *);
/*
* PVO calls.
*/
static int pmap_pvo_enter(pmap_t, uma_zone_t, struct pvo_head *,
vm_offset_t, vm_offset_t, u_int, int);
static void pmap_pvo_remove(struct pvo_entry *, int);
static struct pvo_entry *pmap_pvo_find_va(pmap_t, vm_offset_t, int *);
static struct pte *pmap_pvo_to_pte(const struct pvo_entry *, int);
/*
* Utility routines.
*/
static struct pvo_entry *pmap_rkva_alloc(void);
static void pmap_pa_map(struct pvo_entry *, vm_offset_t,
struct pte *, int *);
static void pmap_pa_unmap(struct pvo_entry *, struct pte *, int *);
static void pmap_syncicache(vm_offset_t, vm_size_t);
static boolean_t pmap_query_bit(vm_page_t, int);
static u_int pmap_clear_bit(vm_page_t, int, int *);
static void tlbia(void);
static __inline int
va_to_sr(u_int *sr, vm_offset_t va)
{
return (sr[(uintptr_t)va >> ADDR_SR_SHFT]);
}
static __inline u_int
va_to_pteg(u_int sr, vm_offset_t addr)
{
u_int hash;
hash = (sr & SR_VSID_MASK) ^ (((u_int)addr & ADDR_PIDX) >>
ADDR_PIDX_SHFT);
return (hash & pmap_pteg_mask);
}
static __inline struct pvo_head *
pa_to_pvoh(vm_offset_t pa, vm_page_t *pg_p)
{
struct vm_page *pg;
pg = PHYS_TO_VM_PAGE(pa);
if (pg_p != NULL)
*pg_p = pg;
if (pg == NULL)
return (&pmap_pvo_unmanaged);
return (&pg->md.mdpg_pvoh);
}
static __inline struct pvo_head *
vm_page_to_pvoh(vm_page_t m)
{
return (&m->md.mdpg_pvoh);
}
static __inline void
pmap_attr_clear(vm_page_t m, int ptebit)
{
m->md.mdpg_attrs &= ~ptebit;
}
static __inline int
pmap_attr_fetch(vm_page_t m)
{
return (m->md.mdpg_attrs);
}
static __inline void
pmap_attr_save(vm_page_t m, int ptebit)
{
m->md.mdpg_attrs |= ptebit;
}
static __inline int
pmap_pte_compare(const struct pte *pt, const struct pte *pvo_pt)
{
if (pt->pte_hi == pvo_pt->pte_hi)
return (1);
return (0);
}
static __inline int
pmap_pte_match(struct pte *pt, u_int sr, vm_offset_t va, int which)
{
return (pt->pte_hi & ~PTE_VALID) ==
(((sr & SR_VSID_MASK) << PTE_VSID_SHFT) |
((va >> ADDR_API_SHFT) & PTE_API) | which);
}
static __inline void
pmap_pte_create(struct pte *pt, u_int sr, vm_offset_t va, u_int pte_lo)
{
/*
* Construct a PTE. Default to IMB initially. Valid bit only gets
* set when the real pte is set in memory.
*
* Note: Don't set the valid bit for correct operation of tlb update.
*/
pt->pte_hi = ((sr & SR_VSID_MASK) << PTE_VSID_SHFT) |
(((va & ADDR_PIDX) >> ADDR_API_SHFT) & PTE_API);
pt->pte_lo = pte_lo;
}
static __inline void
pmap_pte_synch(struct pte *pt, struct pte *pvo_pt)
{
pvo_pt->pte_lo |= pt->pte_lo & (PTE_REF | PTE_CHG);
}
static __inline void
pmap_pte_clear(struct pte *pt, vm_offset_t va, int ptebit)
{
/*
* As shown in Section 7.6.3.2.3
*/
pt->pte_lo &= ~ptebit;
TLBIE(va);
EIEIO();
TLBSYNC();
SYNC();
}
static __inline void
pmap_pte_set(struct pte *pt, struct pte *pvo_pt)
{
pvo_pt->pte_hi |= PTE_VALID;
/*
* Update the PTE as defined in section 7.6.3.1.
* Note that the REF/CHG bits are from pvo_pt and thus should havce
* been saved so this routine can restore them (if desired).
*/
pt->pte_lo = pvo_pt->pte_lo;
EIEIO();
pt->pte_hi = pvo_pt->pte_hi;
SYNC();
pmap_pte_valid++;
}
static __inline void
pmap_pte_unset(struct pte *pt, struct pte *pvo_pt, vm_offset_t va)
{
pvo_pt->pte_hi &= ~PTE_VALID;
/*
* Force the reg & chg bits back into the PTEs.
*/
SYNC();
/*
* Invalidate the pte.
*/
pt->pte_hi &= ~PTE_VALID;
SYNC();
TLBIE(va);
EIEIO();
TLBSYNC();
SYNC();
/*
* Save the reg & chg bits.
*/
pmap_pte_synch(pt, pvo_pt);
pmap_pte_valid--;
}
static __inline void
pmap_pte_change(struct pte *pt, struct pte *pvo_pt, vm_offset_t va)
{
/*
* Invalidate the PTE
*/
pmap_pte_unset(pt, pvo_pt, va);
pmap_pte_set(pt, pvo_pt);
}
/*
* Quick sort callout for comparing memory regions.
*/
static int mr_cmp(const void *a, const void *b);
static int om_cmp(const void *a, const void *b);
static int
mr_cmp(const void *a, const void *b)
{
const struct mem_region *regiona;
const struct mem_region *regionb;
regiona = a;
regionb = b;
if (regiona->mr_start < regionb->mr_start)
return (-1);
else if (regiona->mr_start > regionb->mr_start)
return (1);
else
return (0);
}
static int
om_cmp(const void *a, const void *b)
{
const struct ofw_map *mapa;
const struct ofw_map *mapb;
mapa = a;
mapb = b;
if (mapa->om_pa < mapb->om_pa)
return (-1);
else if (mapa->om_pa > mapb->om_pa)
return (1);
else
return (0);
}
void
pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
{
ihandle_t mmui;
phandle_t chosen, mmu;
int sz;
int i, j;
int ofw_mappings;
vm_size_t size, physsz;
vm_offset_t pa, va, off;
u_int batl, batu;
/*
* Set up BAT0 to map the lowest 256 MB area
*/
battable[0x0].batl = BATL(0x00000000, BAT_M, BAT_PP_RW);
battable[0x0].batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs);
/*
* Map PCI memory space.
*/
battable[0x8].batl = BATL(0x80000000, BAT_I|BAT_G, BAT_PP_RW);
battable[0x8].batu = BATU(0x80000000, BAT_BL_256M, BAT_Vs);
battable[0x9].batl = BATL(0x90000000, BAT_I|BAT_G, BAT_PP_RW);
battable[0x9].batu = BATU(0x90000000, BAT_BL_256M, BAT_Vs);
battable[0xa].batl = BATL(0xa0000000, BAT_I|BAT_G, BAT_PP_RW);
battable[0xa].batu = BATU(0xa0000000, BAT_BL_256M, BAT_Vs);
battable[0xb].batl = BATL(0xb0000000, BAT_I|BAT_G, BAT_PP_RW);
battable[0xb].batu = BATU(0xb0000000, BAT_BL_256M, BAT_Vs);
/*
* Map obio devices.
*/
battable[0xf].batl = BATL(0xf0000000, BAT_I|BAT_G, BAT_PP_RW);
battable[0xf].batu = BATU(0xf0000000, BAT_BL_256M, BAT_Vs);
/*
* Use an IBAT and a DBAT to map the bottom segment of memory
* where we are.
*/
batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs);
batl = BATL(0x00000000, BAT_M, BAT_PP_RW);
__asm ("mtibatu 0,%0; mtibatl 0,%1; isync; \n"
"mtdbatu 0,%0; mtdbatl 0,%1; isync"
:: "r"(batu), "r"(batl));
#if 0
/* map frame buffer */
batu = BATU(0x90000000, BAT_BL_256M, BAT_Vs);
batl = BATL(0x90000000, BAT_I|BAT_G, BAT_PP_RW);
__asm ("mtdbatu 1,%0; mtdbatl 1,%1; isync"
:: "r"(batu), "r"(batl));
#endif
#if 1
/* map pci space */
batu = BATU(0x80000000, BAT_BL_256M, BAT_Vs);
batl = BATL(0x80000000, BAT_I|BAT_G, BAT_PP_RW);
__asm ("mtdbatu 1,%0; mtdbatl 1,%1; isync"
:: "r"(batu), "r"(batl));
#endif
/*
* Set the start and end of kva.
*/
virtual_avail = VM_MIN_KERNEL_ADDRESS;
virtual_end = VM_MAX_KERNEL_ADDRESS;
mem_regions(&pregions, &pregions_sz, &regions, &regions_sz);
CTR0(KTR_PMAP, "pmap_bootstrap: physical memory");
qsort(pregions, pregions_sz, sizeof(*pregions), mr_cmp);
for (i = 0; i < pregions_sz; i++) {
vm_offset_t pa;
vm_offset_t end;
CTR3(KTR_PMAP, "physregion: %#x - %#x (%#x)",
pregions[i].mr_start,
pregions[i].mr_start + pregions[i].mr_size,
pregions[i].mr_size);
/*
* Install entries into the BAT table to allow all
* of physmem to be convered by on-demand BAT entries.
* The loop will sometimes set the same battable element
* twice, but that's fine since they won't be used for
* a while yet.
*/
pa = pregions[i].mr_start & 0xf0000000;
end = pregions[i].mr_start + pregions[i].mr_size;
do {
u_int n = pa >> ADDR_SR_SHFT;
battable[n].batl = BATL(pa, BAT_M, BAT_PP_RW);
battable[n].batu = BATU(pa, BAT_BL_256M, BAT_Vs);
pa += SEGMENT_LENGTH;
} while (pa < end);
}
if (sizeof(phys_avail)/sizeof(phys_avail[0]) < regions_sz)
panic("pmap_bootstrap: phys_avail too small");
qsort(regions, regions_sz, sizeof(*regions), mr_cmp);
phys_avail_count = 0;
physsz = 0;
for (i = 0, j = 0; i < regions_sz; i++, j += 2) {
CTR3(KTR_PMAP, "region: %#x - %#x (%#x)", regions[i].mr_start,
regions[i].mr_start + regions[i].mr_size,
regions[i].mr_size);
phys_avail[j] = regions[i].mr_start;
phys_avail[j + 1] = regions[i].mr_start + regions[i].mr_size;
phys_avail_count++;
physsz += regions[i].mr_size;
}
physmem = btoc(physsz);
/*
* Allocate PTEG table.
*/
#ifdef PTEGCOUNT
pmap_pteg_count = PTEGCOUNT;
#else
pmap_pteg_count = 0x1000;
while (pmap_pteg_count < physmem)
pmap_pteg_count <<= 1;
pmap_pteg_count >>= 1;
#endif /* PTEGCOUNT */
size = pmap_pteg_count * sizeof(struct pteg);
CTR2(KTR_PMAP, "pmap_bootstrap: %d PTEGs, %d bytes", pmap_pteg_count,
size);
pmap_pteg_table = (struct pteg *)pmap_bootstrap_alloc(size, size);
CTR1(KTR_PMAP, "pmap_bootstrap: PTEG table at %p", pmap_pteg_table);
bzero((void *)pmap_pteg_table, pmap_pteg_count * sizeof(struct pteg));
pmap_pteg_mask = pmap_pteg_count - 1;
/*
* Allocate pv/overflow lists.
*/
size = sizeof(struct pvo_head) * pmap_pteg_count;
pmap_pvo_table = (struct pvo_head *)pmap_bootstrap_alloc(size,
PAGE_SIZE);
CTR1(KTR_PMAP, "pmap_bootstrap: PVO table at %p", pmap_pvo_table);
for (i = 0; i < pmap_pteg_count; i++)
LIST_INIT(&pmap_pvo_table[i]);
/*
* Initialize the lock that synchronizes access to the pteg and pvo
* tables.
*/
mtx_init(&pmap_table_mutex, "pmap table", NULL, MTX_DEF);
/*
* Allocate the message buffer.
*/
msgbuf_phys = pmap_bootstrap_alloc(MSGBUF_SIZE, 0);
/*
* Initialise the unmanaged pvo pool.
*/
pmap_bpvo_pool = (struct pvo_entry *)pmap_bootstrap_alloc(
BPVO_POOL_SIZE*sizeof(struct pvo_entry), 0);
pmap_bpvo_pool_index = 0;
/*
* Make sure kernel vsid is allocated as well as VSID 0.
*/
pmap_vsid_bitmap[(KERNEL_VSIDBITS & (NPMAPS - 1)) / VSID_NBPW]
|= 1 << (KERNEL_VSIDBITS % VSID_NBPW);
pmap_vsid_bitmap[0] |= 1;
/*
* Set up the Open Firmware pmap and add it's mappings.
*/
pmap_pinit(&ofw_pmap);
ofw_pmap.pm_sr[KERNEL_SR] = KERNEL_SEGMENT;
ofw_pmap.pm_sr[KERNEL2_SR] = KERNEL2_SEGMENT;
if ((chosen = OF_finddevice("/chosen")) == -1)
panic("pmap_bootstrap: can't find /chosen");
OF_getprop(chosen, "mmu", &mmui, 4);
if ((mmu = OF_instance_to_package(mmui)) == -1)
panic("pmap_bootstrap: can't get mmu package");
if ((sz = OF_getproplen(mmu, "translations")) == -1)
panic("pmap_bootstrap: can't get ofw translation count");
translations = NULL;
for (i = 0; phys_avail[i] != 0; i += 2) {
if (phys_avail[i + 1] >= sz) {
translations = (struct ofw_map *)phys_avail[i];
break;
}
}
if (translations == NULL)
panic("pmap_bootstrap: no space to copy translations");
bzero(translations, sz);
if (OF_getprop(mmu, "translations", translations, sz) == -1)
panic("pmap_bootstrap: can't get ofw translations");
CTR0(KTR_PMAP, "pmap_bootstrap: translations");
sz /= sizeof(*translations);
qsort(translations, sz, sizeof (*translations), om_cmp);
for (i = 0, ofw_mappings = 0; i < sz; i++) {
CTR3(KTR_PMAP, "translation: pa=%#x va=%#x len=%#x",
translations[i].om_pa, translations[i].om_va,
translations[i].om_len);
/*
* If the mapping is 1:1, let the RAM and device on-demand
* BAT tables take care of the translation.
*/
if (translations[i].om_va == translations[i].om_pa)
continue;
/* Enter the pages */
for (off = 0; off < translations[i].om_len; off += PAGE_SIZE) {
struct vm_page m;
m.phys_addr = translations[i].om_pa + off;
pmap_enter(&ofw_pmap, translations[i].om_va + off, &m,
VM_PROT_ALL, 1);
ofw_mappings++;
}
}
#ifdef SMP
TLBSYNC();
#endif
/*
* Initialize the kernel pmap (which is statically allocated).
*/
PMAP_LOCK_INIT(kernel_pmap);
for (i = 0; i < 16; i++) {
kernel_pmap->pm_sr[i] = EMPTY_SEGMENT;
}
kernel_pmap->pm_sr[KERNEL_SR] = KERNEL_SEGMENT;
kernel_pmap->pm_sr[KERNEL2_SR] = KERNEL2_SEGMENT;
kernel_pmap->pm_active = ~0;
/*
* Allocate a kernel stack with a guard page for thread0 and map it
* into the kernel page map.
*/
pa = pmap_bootstrap_alloc(KSTACK_PAGES * PAGE_SIZE, 0);
kstack0_phys = pa;
kstack0 = virtual_avail + (KSTACK_GUARD_PAGES * PAGE_SIZE);
CTR2(KTR_PMAP, "pmap_bootstrap: kstack0 at %#x (%#x)", kstack0_phys,
kstack0);
virtual_avail += (KSTACK_PAGES + KSTACK_GUARD_PAGES) * PAGE_SIZE;
for (i = 0; i < KSTACK_PAGES; i++) {
pa = kstack0_phys + i * PAGE_SIZE;
va = kstack0 + i * PAGE_SIZE;
pmap_kenter(va, pa);
TLBIE(va);
}
/*
* Calculate the last available physical address.
*/
for (i = 0; phys_avail[i + 2] != 0; i += 2)
;
Maxmem = powerpc_btop(phys_avail[i + 1]);
/*
* Allocate virtual address space for the message buffer.
*/
msgbufp = (struct msgbuf *)virtual_avail;
virtual_avail += round_page(MSGBUF_SIZE);
/*
* Initialize hardware.
*/
for (i = 0; i < 16; i++) {
mtsrin(i << ADDR_SR_SHFT, EMPTY_SEGMENT);
}
__asm __volatile ("mtsr %0,%1"
:: "n"(KERNEL_SR), "r"(KERNEL_SEGMENT));
__asm __volatile ("mtsr %0,%1"
:: "n"(KERNEL2_SR), "r"(KERNEL2_SEGMENT));
__asm __volatile ("sync; mtsdr1 %0; isync"
:: "r"((u_int)pmap_pteg_table | (pmap_pteg_mask >> 10)));
tlbia();
pmap_bootstrapped++;
}
/*
* Activate a user pmap. The pmap must be activated before it's address
* space can be accessed in any way.
*/
void
pmap_activate(struct thread *td)
{
pmap_t pm, pmr;
/*
* Load all the data we need up front to encourage the compiler to
* not issue any loads while we have interrupts disabled below.
*/
pm = &td->td_proc->p_vmspace->vm_pmap;
if ((pmr = (pmap_t)pmap_kextract((vm_offset_t)pm)) == NULL)
pmr = pm;
pm->pm_active |= PCPU_GET(cpumask);
PCPU_SET(curpmap, pmr);
}
void
pmap_deactivate(struct thread *td)
{
pmap_t pm;
pm = &td->td_proc->p_vmspace->vm_pmap;
pm->pm_active &= ~(PCPU_GET(cpumask));
PCPU_SET(curpmap, NULL);
}
vm_offset_t
pmap_addr_hint(vm_object_t object, vm_offset_t va, vm_size_t size)
{
return (va);
}
void
pmap_change_wiring(pmap_t pm, vm_offset_t va, boolean_t wired)
{
struct pvo_entry *pvo;
PMAP_LOCK(pm);
pvo = pmap_pvo_find_va(pm, va & ~ADDR_POFF, NULL);
if (pvo != NULL) {
if (wired) {
if ((pvo->pvo_vaddr & PVO_WIRED) == 0)
pm->pm_stats.wired_count++;
pvo->pvo_vaddr |= PVO_WIRED;
} else {
if ((pvo->pvo_vaddr & PVO_WIRED) != 0)
pm->pm_stats.wired_count--;
pvo->pvo_vaddr &= ~PVO_WIRED;
}
}
PMAP_UNLOCK(pm);
}
void
pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr,
vm_size_t len, vm_offset_t src_addr)
{
/*
* This is not needed as it's mainly an optimisation.
* It may want to be implemented later though.
*/
}
void
pmap_copy_page(vm_page_t msrc, vm_page_t mdst)
{
vm_offset_t dst;
vm_offset_t src;
dst = VM_PAGE_TO_PHYS(mdst);
src = VM_PAGE_TO_PHYS(msrc);
kcopy((void *)src, (void *)dst, PAGE_SIZE);
}
/*
* Zero a page of physical memory by temporarily mapping it into the tlb.
*/
void
pmap_zero_page(vm_page_t m)
{
vm_offset_t pa = VM_PAGE_TO_PHYS(m);
caddr_t va;
if (pa < SEGMENT_LENGTH) {
va = (caddr_t) pa;
} else if (pmap_initialized) {
if (pmap_pvo_zeropage == NULL)
pmap_pvo_zeropage = pmap_rkva_alloc();
pmap_pa_map(pmap_pvo_zeropage, pa, NULL, NULL);
va = (caddr_t)PVO_VADDR(pmap_pvo_zeropage);
} else {
panic("pmap_zero_page: can't zero pa %#x", pa);
}
bzero(va, PAGE_SIZE);
if (pa >= SEGMENT_LENGTH)
pmap_pa_unmap(pmap_pvo_zeropage, NULL, NULL);
}
void
pmap_zero_page_area(vm_page_t m, int off, int size)
{
vm_offset_t pa = VM_PAGE_TO_PHYS(m);
caddr_t va;
if (pa < SEGMENT_LENGTH) {
va = (caddr_t) pa;
} else if (pmap_initialized) {
if (pmap_pvo_zeropage == NULL)
pmap_pvo_zeropage = pmap_rkva_alloc();
pmap_pa_map(pmap_pvo_zeropage, pa, NULL, NULL);
va = (caddr_t)PVO_VADDR(pmap_pvo_zeropage);
} else {
panic("pmap_zero_page: can't zero pa %#x", pa);
}
bzero(va + off, size);
if (pa >= SEGMENT_LENGTH)
pmap_pa_unmap(pmap_pvo_zeropage, NULL, NULL);
}
void
pmap_zero_page_idle(vm_page_t m)
{
/* XXX this is called outside of Giant, is pmap_zero_page safe? */
/* XXX maybe have a dedicated mapping for this to avoid the problem? */
mtx_lock(&Giant);
pmap_zero_page(m);
mtx_unlock(&Giant);
}
/*
* Map the given physical page at the specified virtual address in the
* target pmap with the protection requested. If specified the page
* will be wired down.
*/
void
pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
boolean_t wired)
{
struct pvo_head *pvo_head;
uma_zone_t zone;
vm_page_t pg;
u_int pte_lo, pvo_flags, was_exec, i;
int error;
if (!pmap_initialized) {
pvo_head = &pmap_pvo_kunmanaged;
zone = pmap_upvo_zone;
pvo_flags = 0;
pg = NULL;
was_exec = PTE_EXEC;
} else {
pvo_head = vm_page_to_pvoh(m);
pg = m;
zone = pmap_mpvo_zone;
pvo_flags = PVO_MANAGED;
was_exec = 0;
}
if (pmap_bootstrapped)
vm_page_lock_queues();
PMAP_LOCK(pmap);
/*
* If this is a managed page, and it's the first reference to the page,
* clear the execness of the page. Otherwise fetch the execness.
*/
if (pg != NULL) {
if (LIST_EMPTY(pvo_head)) {
pmap_attr_clear(pg, PTE_EXEC);
} else {
was_exec = pmap_attr_fetch(pg) & PTE_EXEC;
}
}
/*
* Assume the page is cache inhibited and access is guarded unless
* it's in our available memory array.
*/
pte_lo = PTE_I | PTE_G;
for (i = 0; i < pregions_sz; i++) {
if ((VM_PAGE_TO_PHYS(m) >= pregions[i].mr_start) &&
(VM_PAGE_TO_PHYS(m) <
(pregions[i].mr_start + pregions[i].mr_size))) {
pte_lo &= ~(PTE_I | PTE_G);
break;
}
}
if (prot & VM_PROT_WRITE)
pte_lo |= PTE_BW;
else
pte_lo |= PTE_BR;
pvo_flags |= (prot & VM_PROT_EXECUTE);
if (wired)
pvo_flags |= PVO_WIRED;
error = pmap_pvo_enter(pmap, zone, pvo_head, va, VM_PAGE_TO_PHYS(m),
pte_lo, pvo_flags);
/*
* Flush the real page from the instruction cache if this page is
* mapped executable and cacheable and was not previously mapped (or
* was not mapped executable).
*/
if (error == 0 && (pvo_flags & PVO_EXECUTABLE) &&
(pte_lo & PTE_I) == 0 && was_exec == 0) {
/*
* Flush the real memory from the cache.
*/
pmap_syncicache(VM_PAGE_TO_PHYS(m), PAGE_SIZE);
if (pg != NULL)
pmap_attr_save(pg, PTE_EXEC);
}
if (pmap_bootstrapped)
vm_page_unlock_queues();
/* XXX syncicache always until problems are sorted */
pmap_syncicache(VM_PAGE_TO_PHYS(m), PAGE_SIZE);
PMAP_UNLOCK(pmap);
}
vm_page_t
pmap_enter_quick(pmap_t pm, vm_offset_t va, vm_page_t m, vm_page_t mpte)
{
vm_page_busy(m);
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(m->object);
mtx_lock(&Giant);
pmap_enter(pm, va, m, VM_PROT_READ | VM_PROT_EXECUTE, FALSE);
mtx_unlock(&Giant);
VM_OBJECT_LOCK(m->object);
vm_page_lock_queues();
vm_page_wakeup(m);
return (NULL);
}
vm_paddr_t
pmap_extract(pmap_t pm, vm_offset_t va)
{
struct pvo_entry *pvo;
vm_paddr_t pa;
PMAP_LOCK(pm);
pvo = pmap_pvo_find_va(pm, va & ~ADDR_POFF, NULL);
if (pvo == NULL)
pa = 0;
else
pa = (pvo->pvo_pte.pte_lo & PTE_RPGN) | (va & ADDR_POFF);
PMAP_UNLOCK(pm);
return (pa);
}
/*
* Atomically extract and hold the physical page with the given
* pmap and virtual address pair if that mapping permits the given
* protection.
*/
vm_page_t
pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
{
struct pvo_entry *pvo;
vm_page_t m;
m = NULL;
mtx_lock(&Giant);
vm_page_lock_queues();
PMAP_LOCK(pmap);
pvo = pmap_pvo_find_va(pmap, va & ~ADDR_POFF, NULL);
if (pvo != NULL && (pvo->pvo_pte.pte_hi & PTE_VALID) &&
((pvo->pvo_pte.pte_lo & PTE_PP) == PTE_RW ||
(prot & VM_PROT_WRITE) == 0)) {
m = PHYS_TO_VM_PAGE(pvo->pvo_pte.pte_lo & PTE_RPGN);
vm_page_hold(m);
}
vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
mtx_unlock(&Giant);
return (m);
}
/*
* Grow the number of kernel page table entries. Unneeded.
*/
void
pmap_growkernel(vm_offset_t addr)
{
}
void
pmap_init(void)
{
CTR0(KTR_PMAP, "pmap_init");
pmap_upvo_zone = uma_zcreate("UPVO entry", sizeof (struct pvo_entry),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
UMA_ZONE_VM | UMA_ZONE_NOFREE);
pmap_mpvo_zone = uma_zcreate("MPVO entry", sizeof(struct pvo_entry),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
UMA_ZONE_VM | UMA_ZONE_NOFREE);
pmap_initialized = TRUE;
}
void
pmap_init2(void)
{
CTR0(KTR_PMAP, "pmap_init2");
}
boolean_t
pmap_is_modified(vm_page_t m)
{
if ((m->flags & (PG_FICTITIOUS |PG_UNMANAGED)) != 0)
return (FALSE);
return (pmap_query_bit(m, PTE_CHG));
}
/*
* pmap_is_prefaultable:
*
* Return whether or not the specified virtual address is elgible
* for prefault.
*/
boolean_t
pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr)
{
return (FALSE);
}
void
pmap_clear_reference(vm_page_t m)
{
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return;
pmap_clear_bit(m, PTE_REF, NULL);
}
void
pmap_clear_modify(vm_page_t m)
{
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return;
pmap_clear_bit(m, PTE_CHG, NULL);
}
/*
* pmap_ts_referenced:
*
* 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.
*/
int
pmap_ts_referenced(vm_page_t m)
{
int count;
if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
return (0);
count = pmap_clear_bit(m, PTE_REF, NULL);
return (count);
}
/*
* Map a wired page into kernel virtual address space.
*/
void
pmap_kenter(vm_offset_t va, vm_offset_t pa)
{
u_int pte_lo;
int error;
int i;
#if 0
if (va < VM_MIN_KERNEL_ADDRESS)
panic("pmap_kenter: attempt to enter non-kernel address %#x",
va);
#endif
pte_lo = PTE_I | PTE_G;
for (i = 0; i < pregions_sz; i++) {
if ((pa >= pregions[i].mr_start) &&
(pa < (pregions[i].mr_start + pregions[i].mr_size))) {
pte_lo &= ~(PTE_I | PTE_G);
break;
}
}
PMAP_LOCK(kernel_pmap);
error = pmap_pvo_enter(kernel_pmap, pmap_upvo_zone,
&pmap_pvo_kunmanaged, va, pa, pte_lo, PVO_WIRED);
if (error != 0 && error != ENOENT)
panic("pmap_kenter: failed to enter va %#x pa %#x: %d", va,
pa, error);
/*
* Flush the real memory from the instruction cache.
*/
if ((pte_lo & (PTE_I | PTE_G)) == 0) {
pmap_syncicache(pa, PAGE_SIZE);
}
PMAP_UNLOCK(kernel_pmap);
}
/*
* Extract the physical page address associated with the given kernel virtual
* address.
*/
vm_offset_t
pmap_kextract(vm_offset_t va)
{
struct pvo_entry *pvo;
vm_paddr_t pa;
#ifdef UMA_MD_SMALL_ALLOC
/*
* Allow direct mappings
*/
if (va < VM_MIN_KERNEL_ADDRESS) {
return (va);
}
#endif
PMAP_LOCK(kernel_pmap);
pvo = pmap_pvo_find_va(kernel_pmap, va & ~ADDR_POFF, NULL);
KASSERT(pvo != NULL, ("pmap_kextract: no addr found"));
pa = (pvo->pvo_pte.pte_lo & PTE_RPGN) | (va & ADDR_POFF);
PMAP_UNLOCK(kernel_pmap);
return (pa);
}
/*
* Remove a wired page from kernel virtual address space.
*/
void
pmap_kremove(vm_offset_t va)
{
pmap_remove(kernel_pmap, va, va + PAGE_SIZE);
}
/*
* 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.
*/
vm_offset_t
pmap_map(vm_offset_t *virt, vm_offset_t pa_start, vm_offset_t pa_end, int prot)
{
vm_offset_t sva, va;
sva = *virt;
va = sva;
for (; pa_start < pa_end; pa_start += PAGE_SIZE, va += PAGE_SIZE)
pmap_kenter(va, pa_start);
*virt = va;
return (sva);
}
int
pmap_mincore(pmap_t pmap, vm_offset_t addr)
{
TODO;
return (0);
}
void
pmap_object_init_pt(pmap_t pm, 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,
("pmap_object_init_pt: non-device object"));
KASSERT(pm == &curproc->p_vmspace->vm_pmap || pm == kernel_pmap,
("pmap_object_init_pt: non current pmap"));
}
/*
* Lower the permission for all mappings to a given page.
*/
void
pmap_page_protect(vm_page_t m, vm_prot_t prot)
{
struct pvo_head *pvo_head;
struct pvo_entry *pvo, *next_pvo;
struct pte *pt;
pmap_t pmap;
/*
* Since the routine only downgrades protection, if the
* maximal protection is desired, there isn't any change
* to be made.
*/
if ((prot & (VM_PROT_READ|VM_PROT_WRITE)) ==
(VM_PROT_READ|VM_PROT_WRITE))
return;
pvo_head = vm_page_to_pvoh(m);
for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) {
next_pvo = LIST_NEXT(pvo, pvo_vlink);
PMAP_PVO_CHECK(pvo); /* sanity check */
pmap = pvo->pvo_pmap;
PMAP_LOCK(pmap);
/*
* Downgrading to no mapping at all, we just remove the entry.
*/
if ((prot & VM_PROT_READ) == 0) {
pmap_pvo_remove(pvo, -1);
PMAP_UNLOCK(pmap);
continue;
}
/*
* If EXEC permission is being revoked, just clear the flag
* in the PVO.
*/
if ((prot & VM_PROT_EXECUTE) == 0)
pvo->pvo_vaddr &= ~PVO_EXECUTABLE;
/*
* If this entry is already RO, don't diddle with the page
* table.
*/
if ((pvo->pvo_pte.pte_lo & PTE_PP) == PTE_BR) {
PMAP_UNLOCK(pmap);
PMAP_PVO_CHECK(pvo);
continue;
}
/*
* Grab the PTE before we diddle the bits so pvo_to_pte can
* verify the pte contents are as expected.
*/
pt = pmap_pvo_to_pte(pvo, -1);
pvo->pvo_pte.pte_lo &= ~PTE_PP;
pvo->pvo_pte.pte_lo |= PTE_BR;
if (pt != NULL)
pmap_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PMAP_UNLOCK(pmap);
PMAP_PVO_CHECK(pvo); /* sanity check */
}
/*
* Downgrading from writeable: clear the VM page flag
*/
if ((prot & VM_PROT_WRITE) != VM_PROT_WRITE)
vm_page_flag_clear(m, PG_WRITEABLE);
}
/*
* Returns 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.
*/
boolean_t
pmap_page_exists_quick(pmap_t pmap, vm_page_t m)
{
int loops;
struct pvo_entry *pvo;
if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
return FALSE;
loops = 0;
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
if (pvo->pvo_pmap == pmap)
return (TRUE);
if (++loops >= 16)
break;
}
return (FALSE);
}
static u_int pmap_vsidcontext;
void
pmap_pinit(pmap_t pmap)
{
int i, mask;
u_int entropy;
KASSERT((int)pmap < VM_MIN_KERNEL_ADDRESS, ("pmap_pinit: virt pmap"));
PMAP_LOCK_INIT(pmap);
entropy = 0;
__asm __volatile("mftb %0" : "=r"(entropy));
/*
* Allocate some segment registers for this pmap.
*/
for (i = 0; i < NPMAPS; i += VSID_NBPW) {
u_int hash, n;
/*
* Create a new value by mutiplying by a prime and adding in
* entropy from the timebase register. This is to make the
* VSID more random so that the PT hash function collides
* less often. (Note that the prime casues gcc to do shifts
* instead of a multiply.)
*/
pmap_vsidcontext = (pmap_vsidcontext * 0x1105) + entropy;
hash = pmap_vsidcontext & (NPMAPS - 1);
if (hash == 0) /* 0 is special, avoid it */
continue;
n = hash >> 5;
mask = 1 << (hash & (VSID_NBPW - 1));
hash = (pmap_vsidcontext & 0xfffff);
if (pmap_vsid_bitmap[n] & mask) { /* collision? */
/* anything free in this bucket? */
if (pmap_vsid_bitmap[n] == 0xffffffff) {
entropy = (pmap_vsidcontext >> 20);
continue;
}
i = ffs(~pmap_vsid_bitmap[i]) - 1;
mask = 1 << i;
hash &= 0xfffff & ~(VSID_NBPW - 1);
hash |= i;
}
pmap_vsid_bitmap[n] |= mask;
for (i = 0; i < 16; i++)
pmap->pm_sr[i] = VSID_MAKE(i, hash);
return;
}
panic("pmap_pinit: out of segments");
}
/*
* Initialize the pmap associated with process 0.
*/
void
pmap_pinit0(pmap_t pm)
{
pmap_pinit(pm);
bzero(&pm->pm_stats, sizeof(pm->pm_stats));
}
/*
* Set the physical protection on the specified range of this map as requested.
*/
void
pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
{
struct pvo_entry *pvo;
struct pte *pt;
int pteidx;
CTR4(KTR_PMAP, "pmap_protect: pm=%p sva=%#x eva=%#x prot=%#x", pm, sva,
eva, prot);
KASSERT(pm == &curproc->p_vmspace->vm_pmap || pm == kernel_pmap,
("pmap_protect: non current pmap"));
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
mtx_lock(&Giant);
pmap_remove(pm, sva, eva);
mtx_unlock(&Giant);
return;
}
mtx_lock(&Giant);
vm_page_lock_queues();
PMAP_LOCK(pm);
for (; sva < eva; sva += PAGE_SIZE) {
pvo = pmap_pvo_find_va(pm, sva, &pteidx);
if (pvo == NULL)
continue;
if ((prot & VM_PROT_EXECUTE) == 0)
pvo->pvo_vaddr &= ~PVO_EXECUTABLE;
/*
* Grab the PTE pointer before we diddle with the cached PTE
* copy.
*/
pt = pmap_pvo_to_pte(pvo, pteidx);
/*
* Change the protection of the page.
*/
pvo->pvo_pte.pte_lo &= ~PTE_PP;
pvo->pvo_pte.pte_lo |= PTE_BR;
/*
* If the PVO is in the page table, update that pte as well.
*/
if (pt != NULL)
pmap_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
}
vm_page_unlock_queues();
PMAP_UNLOCK(pm);
mtx_unlock(&Giant);
}
/*
* 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.
*/
void
pmap_qenter(vm_offset_t sva, vm_page_t *m, int count)
{
vm_offset_t va;
va = sva;
while (count-- > 0) {
pmap_kenter(va, VM_PAGE_TO_PHYS(*m));
va += PAGE_SIZE;
m++;
}
}
/*
* Remove page mappings from kernel virtual address space. Intended for
* temporary mappings entered by pmap_qenter.
*/
void
pmap_qremove(vm_offset_t sva, int count)
{
vm_offset_t va;
va = sva;
while (count-- > 0) {
pmap_kremove(va);
va += PAGE_SIZE;
}
}
void
pmap_release(pmap_t pmap)
{
int idx, mask;
/*
* Free segment register's VSID
*/
if (pmap->pm_sr[0] == 0)
panic("pmap_release");
idx = VSID_TO_HASH(pmap->pm_sr[0]) & (NPMAPS-1);
mask = 1 << (idx % VSID_NBPW);
idx /= VSID_NBPW;
pmap_vsid_bitmap[idx] &= ~mask;
PMAP_LOCK_DESTROY(pmap);
}
/*
* Remove the given range of addresses from the specified map.
*/
void
pmap_remove(pmap_t pm, vm_offset_t sva, vm_offset_t eva)
{
struct pvo_entry *pvo;
int pteidx;
vm_page_lock_queues();
PMAP_LOCK(pm);
for (; sva < eva; sva += PAGE_SIZE) {
pvo = pmap_pvo_find_va(pm, sva, &pteidx);
if (pvo != NULL) {
pmap_pvo_remove(pvo, pteidx);
}
}
vm_page_unlock_queues();
PMAP_UNLOCK(pm);
}
/*
* Remove physical page from all pmaps in which it resides. pmap_pvo_remove()
* will reflect changes in pte's back to the vm_page.
*/
void
pmap_remove_all(vm_page_t m)
{
struct pvo_head *pvo_head;
struct pvo_entry *pvo, *next_pvo;
pmap_t pmap;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
pvo_head = vm_page_to_pvoh(m);
for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) {
next_pvo = LIST_NEXT(pvo, pvo_vlink);
PMAP_PVO_CHECK(pvo); /* sanity check */
pmap = pvo->pvo_pmap;
PMAP_LOCK(pmap);
pmap_pvo_remove(pvo, -1);
PMAP_UNLOCK(pmap);
}
vm_page_flag_clear(m, PG_WRITEABLE);
}
/*
* Remove all pages from specified address space, this aids process exit
* speeds. This is much faster than pmap_remove in the case of running down
* an entire address space. Only works for the current pmap.
*/
void
pmap_remove_pages(pmap_t pm, vm_offset_t sva, vm_offset_t eva)
{
}
/*
* Allocate a physical page of memory directly from the phys_avail map.
* Can only be called from pmap_bootstrap before avail start and end are
* calculated.
*/
static vm_offset_t
pmap_bootstrap_alloc(vm_size_t size, u_int align)
{
vm_offset_t s, e;
int i, j;
size = round_page(size);
for (i = 0; phys_avail[i + 1] != 0; i += 2) {
if (align != 0)
s = (phys_avail[i] + align - 1) & ~(align - 1);
else
s = phys_avail[i];
e = s + size;
if (s < phys_avail[i] || e > phys_avail[i + 1])
continue;
if (s == phys_avail[i]) {
phys_avail[i] += size;
} else if (e == phys_avail[i + 1]) {
phys_avail[i + 1] -= size;
} else {
for (j = phys_avail_count * 2; j > i; j -= 2) {
phys_avail[j] = phys_avail[j - 2];
phys_avail[j + 1] = phys_avail[j - 1];
}
phys_avail[i + 3] = phys_avail[i + 1];
phys_avail[i + 1] = s;
phys_avail[i + 2] = e;
phys_avail_count++;
}
return (s);
}
panic("pmap_bootstrap_alloc: could not allocate memory");
}
/*
* Return an unmapped pvo for a kernel virtual address.
* Used by pmap functions that operate on physical pages.
*/
static struct pvo_entry *
pmap_rkva_alloc(void)
{
struct pvo_entry *pvo;
struct pte *pt;
vm_offset_t kva;
int pteidx;
if (pmap_rkva_count == 0)
panic("pmap_rkva_alloc: no more reserved KVAs");
kva = pmap_rkva_start + (PAGE_SIZE * --pmap_rkva_count);
pmap_kenter(kva, 0);
pvo = pmap_pvo_find_va(kernel_pmap, kva, &pteidx);
if (pvo == NULL)
panic("pmap_kva_alloc: pmap_pvo_find_va failed");
pt = pmap_pvo_to_pte(pvo, pteidx);
if (pt == NULL)
panic("pmap_kva_alloc: pmap_pvo_to_pte failed");
pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PVO_PTEGIDX_CLR(pvo);
pmap_pte_overflow++;
return (pvo);
}
static void
pmap_pa_map(struct pvo_entry *pvo, vm_offset_t pa, struct pte *saved_pt,
int *depth_p)
{
struct pte *pt;
/*
* If this pvo already has a valid pte, we need to save it so it can
* be restored later. We then just reload the new PTE over the old
* slot.
*/
if (saved_pt != NULL) {
pt = pmap_pvo_to_pte(pvo, -1);
if (pt != NULL) {
pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PVO_PTEGIDX_CLR(pvo);
pmap_pte_overflow++;
}
*saved_pt = pvo->pvo_pte;
pvo->pvo_pte.pte_lo &= ~PTE_RPGN;
}
pvo->pvo_pte.pte_lo |= pa;
if (!pmap_pte_spill(pvo->pvo_vaddr))
panic("pmap_pa_map: could not spill pvo %p", pvo);
if (depth_p != NULL)
(*depth_p)++;
}
static void
pmap_pa_unmap(struct pvo_entry *pvo, struct pte *saved_pt, int *depth_p)
{
struct pte *pt;
pt = pmap_pvo_to_pte(pvo, -1);
if (pt != NULL) {
pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PVO_PTEGIDX_CLR(pvo);
pmap_pte_overflow++;
}
pvo->pvo_pte.pte_lo &= ~PTE_RPGN;
/*
* If there is a saved PTE and it's valid, restore it and return.
*/
if (saved_pt != NULL && (saved_pt->pte_lo & PTE_RPGN) != 0) {
if (depth_p != NULL && --(*depth_p) == 0)
panic("pmap_pa_unmap: restoring but depth == 0");
pvo->pvo_pte = *saved_pt;
if (!pmap_pte_spill(pvo->pvo_vaddr))
panic("pmap_pa_unmap: could not spill pvo %p", pvo);
}
}
static void
pmap_syncicache(vm_offset_t pa, vm_size_t len)
{
__syncicache((void *)pa, len);
}
static void
tlbia(void)
{
caddr_t i;
SYNC();
for (i = 0; i < (caddr_t)0x00040000; i += 0x00001000) {
TLBIE(i);
EIEIO();
}
TLBSYNC();
SYNC();
}
static int
pmap_pvo_enter(pmap_t pm, uma_zone_t zone, struct pvo_head *pvo_head,
vm_offset_t va, vm_offset_t pa, u_int pte_lo, int flags)
{
struct pvo_entry *pvo;
u_int sr;
int first;
u_int ptegidx;
int i;
int bootstrap;
pmap_pvo_enter_calls++;
first = 0;
bootstrap = 0;
/*
* Compute the PTE Group index.
*/
va &= ~ADDR_POFF;
sr = va_to_sr(pm->pm_sr, va);
ptegidx = va_to_pteg(sr, va);
/*
* Remove any existing mapping for this page. Reuse the pvo entry if
* there is a mapping.
*/
mtx_lock(&pmap_table_mutex);
LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx], pvo_olink) {
if (pvo->pvo_pmap == pm && PVO_VADDR(pvo) == va) {
if ((pvo->pvo_pte.pte_lo & PTE_RPGN) == pa &&
(pvo->pvo_pte.pte_lo & PTE_PP) ==
(pte_lo & PTE_PP)) {
mtx_unlock(&pmap_table_mutex);
return (0);
}
pmap_pvo_remove(pvo, -1);
break;
}
}
/*
* If we aren't overwriting a mapping, try to allocate.
*/
if (pmap_initialized) {
pvo = uma_zalloc(zone, M_NOWAIT);
} else {
if (pmap_bpvo_pool_index >= BPVO_POOL_SIZE) {
panic("pmap_enter: bpvo pool exhausted, %d, %d, %d",
pmap_bpvo_pool_index, BPVO_POOL_SIZE,
BPVO_POOL_SIZE * sizeof(struct pvo_entry));
}
pvo = &pmap_bpvo_pool[pmap_bpvo_pool_index];
pmap_bpvo_pool_index++;
bootstrap = 1;
}
if (pvo == NULL) {
mtx_unlock(&pmap_table_mutex);
return (ENOMEM);
}
pmap_pvo_entries++;
pvo->pvo_vaddr = va;
pvo->pvo_pmap = pm;
LIST_INSERT_HEAD(&pmap_pvo_table[ptegidx], pvo, pvo_olink);
pvo->pvo_vaddr &= ~ADDR_POFF;
if (flags & VM_PROT_EXECUTE)
pvo->pvo_vaddr |= PVO_EXECUTABLE;
if (flags & PVO_WIRED)
pvo->pvo_vaddr |= PVO_WIRED;
if (pvo_head != &pmap_pvo_kunmanaged)
pvo->pvo_vaddr |= PVO_MANAGED;
if (bootstrap)
pvo->pvo_vaddr |= PVO_BOOTSTRAP;
pmap_pte_create(&pvo->pvo_pte, sr, va, pa | pte_lo);
/*
* Remember if the list was empty and therefore will be the first
* item.
*/
if (LIST_FIRST(pvo_head) == NULL)
first = 1;
LIST_INSERT_HEAD(pvo_head, pvo, pvo_vlink);
if (pvo->pvo_pte.pte_lo & PVO_WIRED)
pm->pm_stats.wired_count++;
pm->pm_stats.resident_count++;
/*
* We hope this succeeds but it isn't required.
*/
i = pmap_pte_insert(ptegidx, &pvo->pvo_pte);
if (i >= 0) {
PVO_PTEGIDX_SET(pvo, i);
} else {
panic("pmap_pvo_enter: overflow");
pmap_pte_overflow++;
}
mtx_unlock(&pmap_table_mutex);
return (first ? ENOENT : 0);
}
static void
pmap_pvo_remove(struct pvo_entry *pvo, int pteidx)
{
struct pte *pt;
/*
* If there is an active pte entry, we need to deactivate it (and
* save the ref & cfg bits).
*/
pt = pmap_pvo_to_pte(pvo, pteidx);
if (pt != NULL) {
pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PVO_PTEGIDX_CLR(pvo);
} else {
pmap_pte_overflow--;
}
/*
* Update our statistics.
*/
pvo->pvo_pmap->pm_stats.resident_count--;
if (pvo->pvo_pte.pte_lo & PVO_WIRED)
pvo->pvo_pmap->pm_stats.wired_count--;
/*
* Save the REF/CHG bits into their cache if the page is managed.
*/
if (pvo->pvo_vaddr & PVO_MANAGED) {
struct vm_page *pg;
pg = PHYS_TO_VM_PAGE(pvo->pvo_pte.pte_lo & PTE_RPGN);
if (pg != NULL) {
pmap_attr_save(pg, pvo->pvo_pte.pte_lo &
(PTE_REF | PTE_CHG));
}
}
/*
* Remove this PVO from the PV list.
*/
LIST_REMOVE(pvo, pvo_vlink);
/*
* Remove this from the overflow list and return it to the pool
* if we aren't going to reuse it.
*/
LIST_REMOVE(pvo, pvo_olink);
if (!(pvo->pvo_vaddr & PVO_BOOTSTRAP))
uma_zfree(pvo->pvo_vaddr & PVO_MANAGED ? pmap_mpvo_zone :
pmap_upvo_zone, pvo);
pmap_pvo_entries--;
pmap_pvo_remove_calls++;
}
static __inline int
pmap_pvo_pte_index(const struct pvo_entry *pvo, int ptegidx)
{
int pteidx;
/*
* We can find the actual pte entry without searching by grabbing
* the PTEG index from 3 unused bits in pte_lo[11:9] and by
* noticing the HID bit.
*/
pteidx = ptegidx * 8 + PVO_PTEGIDX_GET(pvo);
if (pvo->pvo_pte.pte_hi & PTE_HID)
pteidx ^= pmap_pteg_mask * 8;
return (pteidx);
}
static struct pvo_entry *
pmap_pvo_find_va(pmap_t pm, vm_offset_t va, int *pteidx_p)
{
struct pvo_entry *pvo;
int ptegidx;
u_int sr;
va &= ~ADDR_POFF;
sr = va_to_sr(pm->pm_sr, va);
ptegidx = va_to_pteg(sr, va);
mtx_lock(&pmap_table_mutex);
LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx], pvo_olink) {
if (pvo->pvo_pmap == pm && PVO_VADDR(pvo) == va) {
if (pteidx_p)
*pteidx_p = pmap_pvo_pte_index(pvo, ptegidx);
break;
}
}
mtx_unlock(&pmap_table_mutex);
return (pvo);
}
static struct pte *
pmap_pvo_to_pte(const struct pvo_entry *pvo, int pteidx)
{
struct pte *pt;
/*
* If we haven't been supplied the ptegidx, calculate it.
*/
if (pteidx == -1) {
int ptegidx;
u_int sr;
sr = va_to_sr(pvo->pvo_pmap->pm_sr, pvo->pvo_vaddr);
ptegidx = va_to_pteg(sr, pvo->pvo_vaddr);
pteidx = pmap_pvo_pte_index(pvo, ptegidx);
}
pt = &pmap_pteg_table[pteidx >> 3].pt[pteidx & 7];
if ((pvo->pvo_pte.pte_hi & PTE_VALID) && !PVO_PTEGIDX_ISSET(pvo)) {
panic("pmap_pvo_to_pte: pvo %p has valid pte in pvo but no "
"valid pte index", pvo);
}
if ((pvo->pvo_pte.pte_hi & PTE_VALID) == 0 && PVO_PTEGIDX_ISSET(pvo)) {
panic("pmap_pvo_to_pte: pvo %p has valid pte index in pvo "
"pvo but no valid pte", pvo);
}
if ((pt->pte_hi ^ (pvo->pvo_pte.pte_hi & ~PTE_VALID)) == PTE_VALID) {
if ((pvo->pvo_pte.pte_hi & PTE_VALID) == 0) {
panic("pmap_pvo_to_pte: pvo %p has valid pte in "
"pmap_pteg_table %p but invalid in pvo", pvo, pt);
}
if (((pt->pte_lo ^ pvo->pvo_pte.pte_lo) & ~(PTE_CHG|PTE_REF))
!= 0) {
panic("pmap_pvo_to_pte: pvo %p pte does not match "
"pte %p in pmap_pteg_table", pvo, pt);
}
return (pt);
}
if (pvo->pvo_pte.pte_hi & PTE_VALID) {
panic("pmap_pvo_to_pte: pvo %p has invalid pte %p in "
"pmap_pteg_table but valid in pvo", pvo, pt);
}
return (NULL);
}
/*
* XXX: THIS STUFF SHOULD BE IN pte.c?
*/
int
pmap_pte_spill(vm_offset_t addr)
{
struct pvo_entry *source_pvo, *victim_pvo;
struct pvo_entry *pvo;
int ptegidx, i, j;
u_int sr;
struct pteg *pteg;
struct pte *pt;
pmap_pte_spills++;
sr = mfsrin(addr);
ptegidx = va_to_pteg(sr, addr);
/*
* Have to substitute some entry. Use the primary hash for this.
* Use low bits of timebase as random generator.
*/
pteg = &pmap_pteg_table[ptegidx];
mtx_lock(&pmap_table_mutex);
__asm __volatile("mftb %0" : "=r"(i));
i &= 7;
pt = &pteg->pt[i];
source_pvo = NULL;
victim_pvo = NULL;
LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx], pvo_olink) {
/*
* We need to find a pvo entry for this address.
*/
PMAP_PVO_CHECK(pvo);
if (source_pvo == NULL &&
pmap_pte_match(&pvo->pvo_pte, sr, addr,
pvo->pvo_pte.pte_hi & PTE_HID)) {
/*
* Now found an entry to be spilled into the pteg.
* The PTE is now valid, so we know it's active.
*/
j = pmap_pte_insert(ptegidx, &pvo->pvo_pte);
if (j >= 0) {
PVO_PTEGIDX_SET(pvo, j);
pmap_pte_overflow--;
PMAP_PVO_CHECK(pvo);
mtx_unlock(&pmap_table_mutex);
return (1);
}
source_pvo = pvo;
if (victim_pvo != NULL)
break;
}
/*
* We also need the pvo entry of the victim we are replacing
* so save the R & C bits of the PTE.
*/
if ((pt->pte_hi & PTE_HID) == 0 && victim_pvo == NULL &&
pmap_pte_compare(pt, &pvo->pvo_pte)) {
victim_pvo = pvo;
if (source_pvo != NULL)
break;
}
}
if (source_pvo == NULL) {
mtx_unlock(&pmap_table_mutex);
return (0);
}
if (victim_pvo == NULL) {
if ((pt->pte_hi & PTE_HID) == 0)
panic("pmap_pte_spill: victim p-pte (%p) has no pvo"
"entry", pt);
/*
* If this is a secondary PTE, we need to search it's primary
* pvo bucket for the matching PVO.
*/
LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx ^ pmap_pteg_mask],
pvo_olink) {
PMAP_PVO_CHECK(pvo);
/*
* We also need the pvo entry of the victim we are
* replacing so save the R & C bits of the PTE.
*/
if (pmap_pte_compare(pt, &pvo->pvo_pte)) {
victim_pvo = pvo;
break;
}
}
if (victim_pvo == NULL)
panic("pmap_pte_spill: victim s-pte (%p) has no pvo"
"entry", pt);
}
/*
* We are invalidating the TLB entry for the EA we are replacing even
* though it's valid. If we don't, we lose any ref/chg bit changes
* contained in the TLB entry.
*/
source_pvo->pvo_pte.pte_hi &= ~PTE_HID;
pmap_pte_unset(pt, &victim_pvo->pvo_pte, victim_pvo->pvo_vaddr);
pmap_pte_set(pt, &source_pvo->pvo_pte);
PVO_PTEGIDX_CLR(victim_pvo);
PVO_PTEGIDX_SET(source_pvo, i);
pmap_pte_replacements++;
PMAP_PVO_CHECK(victim_pvo);
PMAP_PVO_CHECK(source_pvo);
mtx_unlock(&pmap_table_mutex);
return (1);
}
static int
pmap_pte_insert(u_int ptegidx, struct pte *pvo_pt)
{
struct pte *pt;
int i;
/*
* First try primary hash.
*/
for (pt = pmap_pteg_table[ptegidx].pt, i = 0; i < 8; i++, pt++) {
if ((pt->pte_hi & PTE_VALID) == 0) {
pvo_pt->pte_hi &= ~PTE_HID;
pmap_pte_set(pt, pvo_pt);
return (i);
}
}
/*
* Now try secondary hash.
*/
ptegidx ^= pmap_pteg_mask;
ptegidx++;
for (pt = pmap_pteg_table[ptegidx].pt, i = 0; i < 8; i++, pt++) {
if ((pt->pte_hi & PTE_VALID) == 0) {
pvo_pt->pte_hi |= PTE_HID;
pmap_pte_set(pt, pvo_pt);
return (i);
}
}
panic("pmap_pte_insert: overflow");
return (-1);
}
static boolean_t
pmap_query_bit(vm_page_t m, int ptebit)
{
struct pvo_entry *pvo;
struct pte *pt;
#if 0
if (pmap_attr_fetch(m) & ptebit)
return (TRUE);
#endif
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
PMAP_PVO_CHECK(pvo); /* sanity check */
/*
* See if we saved the bit off. If so, cache it and return
* success.
*/
if (pvo->pvo_pte.pte_lo & ptebit) {
pmap_attr_save(m, ptebit);
PMAP_PVO_CHECK(pvo); /* sanity check */
return (TRUE);
}
}
/*
* No luck, now go through the hard part of looking at the PTEs
* themselves. Sync so that any pending REF/CHG bits are flushed to
* the PTEs.
*/
SYNC();
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
PMAP_PVO_CHECK(pvo); /* sanity check */
/*
* See if this pvo has a valid PTE. if so, fetch the
* REF/CHG bits from the valid PTE. If the appropriate
* ptebit is set, cache it and return success.
*/
pt = pmap_pvo_to_pte(pvo, -1);
if (pt != NULL) {
pmap_pte_synch(pt, &pvo->pvo_pte);
if (pvo->pvo_pte.pte_lo & ptebit) {
pmap_attr_save(m, ptebit);
PMAP_PVO_CHECK(pvo); /* sanity check */
return (TRUE);
}
}
}
return (FALSE);
}
static u_int
pmap_clear_bit(vm_page_t m, int ptebit, int *origbit)
{
u_int count;
struct pvo_entry *pvo;
struct pte *pt;
int rv;
/*
* Clear the cached value.
*/
rv = pmap_attr_fetch(m);
pmap_attr_clear(m, ptebit);
/*
* Sync so that any pending REF/CHG bits are flushed to the PTEs (so
* we can reset the right ones). note that since the pvo entries and
* list heads are accessed via BAT0 and are never placed in the page
* table, we don't have to worry about further accesses setting the
* REF/CHG bits.
*/
SYNC();
/*
* For each pvo entry, clear the pvo's ptebit. If this pvo has a
* valid pte clear the ptebit from the valid pte.
*/
count = 0;
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
PMAP_PVO_CHECK(pvo); /* sanity check */
pt = pmap_pvo_to_pte(pvo, -1);
if (pt != NULL) {
pmap_pte_synch(pt, &pvo->pvo_pte);
if (pvo->pvo_pte.pte_lo & ptebit) {
count++;
pmap_pte_clear(pt, PVO_VADDR(pvo), ptebit);
}
}
rv |= pvo->pvo_pte.pte_lo;
pvo->pvo_pte.pte_lo &= ~ptebit;
PMAP_PVO_CHECK(pvo); /* sanity check */
}
if (origbit != NULL) {
*origbit = rv;
}
return (count);
}
/*
* Return true if the physical range is encompassed by the battable[idx]
*/
static int
pmap_bat_mapped(int idx, vm_offset_t pa, vm_size_t size)
{
u_int prot;
u_int32_t start;
u_int32_t end;
u_int32_t bat_ble;
/*
* Return immediately if not a valid mapping
*/
if (!battable[idx].batu & BAT_Vs)
return (EINVAL);
/*
* The BAT entry must be cache-inhibited, guarded, and r/w
* so it can function as an i/o page
*/
prot = battable[idx].batl & (BAT_I|BAT_G|BAT_PP_RW);
if (prot != (BAT_I|BAT_G|BAT_PP_RW))
return (EPERM);
/*
* The address should be within the BAT range. Assume that the
* start address in the BAT has the correct alignment (thus
* not requiring masking)
*/
start = battable[idx].batl & BAT_PBS;
bat_ble = (battable[idx].batu & ~(BAT_EBS)) | 0x03;
end = start | (bat_ble << 15) | 0x7fff;
if ((pa < start) || ((pa + size) > end))
return (ERANGE);
return (0);
}
int
pmap_dev_direct_mapped(vm_offset_t pa, vm_size_t size)
{
int i;
/*
* This currently does not work for entries that
* overlap 256M BAT segments.
*/
for(i = 0; i < 16; i++)
if (pmap_bat_mapped(i, pa, size) == 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.
*/
void *
pmap_mapdev(vm_offset_t pa, vm_size_t size)
{
vm_offset_t va, tmpva, ppa, offset;
int i;
ppa = trunc_page(pa);
offset = pa & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);
GIANT_REQUIRED;
/*
* If the physical address lies within a valid BAT table entry,
* return the 1:1 mapping. This currently doesn't work
* for regions that overlap 256M BAT segments.
*/
for (i = 0; i < 16; i++) {
if (pmap_bat_mapped(i, pa, size) == 0)
return ((void *) pa);
}
va = kmem_alloc_nofault(kernel_map, size);
if (!va)
panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
for (tmpva = va; size > 0;) {
pmap_kenter(tmpva, ppa);
TLBIE(tmpva); /* XXX or should it be invalidate-all ? */
size -= PAGE_SIZE;
tmpva += PAGE_SIZE;
ppa += PAGE_SIZE;
}
return ((void *)(va + offset));
}
void
pmap_unmapdev(vm_offset_t va, vm_size_t size)
{
vm_offset_t base, offset;
/*
* If this is outside kernel virtual space, then it's a
* battable entry and doesn't require unmapping
*/
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);
}
}
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