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freebsd-skq/sys/i386/include/pmap.h
Alan Cox 3153e878dd Add support to the virtual memory system for configuring machine- 
dependent memory attributes:

Rename vm_cache_mode_t to vm_memattr_t.  The new name reflects the
fact that there are machine-dependent memory attributes that have
nothing to do with controlling the cache's behavior.

Introduce vm_object_set_memattr() for setting the default memory
attributes that will be given to an object's pages.

Introduce and use pmap_page_{get,set}_memattr() for getting and
setting a page's machine-dependent memory attributes.  Add full
support for these functions on amd64 and i386 and stubs for them on
the other architectures.  The function pmap_page_set_memattr() is also
responsible for any other machine-dependent aspects of changing a
page's memory attributes, such as flushing the cache or updating the
direct map.  The uses include kmem_alloc_contig(), vm_page_alloc(),
and the device pager:

  kmem_alloc_contig() can now be used to allocate kernel memory with
  non-default memory attributes on amd64 and i386.

  vm_page_alloc() and the device pager will set the memory attributes
  for the real or fictitious page according to the object's default
  memory attributes.

Update the various pmap functions on amd64 and i386 that map pages to
incorporate each page's memory attributes in the mapping.

Notes: (1) Inherent to this design are safety features that prevent
the specification of inconsistent memory attributes by different
mappings on amd64 and i386.  In addition, the device pager provides a
warning when a device driver creates a fictitious page with memory
attributes that are inconsistent with the real page that the
fictitious page is an alias for. (2) Storing the machine-dependent
memory attributes for amd64 and i386 as a dedicated "int" in "struct
md_page" represents a compromise between space efficiency and the ease
of MFCing these changes to RELENG_7.

In collaboration with: jhb

Approved by:	re (kib)
2009-07-12 23:31:20 +00:00

489 lines
13 KiB
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/*-
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and William Jolitz of UUNET Technologies 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.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* Derived from hp300 version by Mike Hibler, this version by William
* Jolitz uses a recursive map [a pde points to the page directory] to
* map the page tables using the pagetables themselves. This is done to
* reduce the impact on kernel virtual memory for lots of sparse address
* space, and to reduce the cost of memory to each process.
*
* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
* $FreeBSD$
*/
#ifndef _MACHINE_PMAP_H_
#define _MACHINE_PMAP_H_
/*
* Page-directory and page-table entries follow this format, with a few
* of the fields not present here and there, depending on a lot of things.
*/
/* ---- Intel Nomenclature ---- */
#define PG_V 0x001 /* P Valid */
#define PG_RW 0x002 /* R/W Read/Write */
#define PG_U 0x004 /* U/S User/Supervisor */
#define PG_NC_PWT 0x008 /* PWT Write through */
#define PG_NC_PCD 0x010 /* PCD Cache disable */
#define PG_A 0x020 /* A Accessed */
#define PG_M 0x040 /* D Dirty */
#define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
#define PG_PTE_PAT 0x080 /* PAT PAT index */
#define PG_G 0x100 /* G Global */
#define PG_AVAIL1 0x200 /* / Available for system */
#define PG_AVAIL2 0x400 /* < programmers use */
#define PG_AVAIL3 0x800 /* \ */
#define PG_PDE_PAT 0x1000 /* PAT PAT index */
#ifdef PAE
#define PG_NX (1ull<<63) /* No-execute */
#endif
/* Our various interpretations of the above */
#define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
#define PG_MANAGED PG_AVAIL2
#ifdef PAE
#define PG_FRAME (0x000ffffffffff000ull)
#define PG_PS_FRAME (0x000fffffffe00000ull)
#else
#define PG_FRAME (~PAGE_MASK)
#define PG_PS_FRAME (0xffc00000)
#endif
#define PG_PROT (PG_RW|PG_U) /* all protection bits . */
#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
/*
* Promotion to a 2 or 4MB (PDE) page mapping requires that the corresponding
* 4KB (PTE) page mappings have identical settings for the following fields:
*/
#define PG_PTE_PROMOTE (PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \
PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V)
/*
* Page Protection Exception bits
*/
#define PGEX_P 0x01 /* Protection violation vs. not present */
#define PGEX_W 0x02 /* during a Write cycle */
#define PGEX_U 0x04 /* access from User mode (UPL) */
#define PGEX_RSV 0x08 /* reserved PTE field is non-zero */
#define PGEX_I 0x10 /* during an instruction fetch */
/*
* Size of Kernel address space. This is the number of page table pages
* (4MB each) to use for the kernel. 256 pages == 1 Gigabyte.
* This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
* For PAE, the page table page unit size is 2MB. This means that 512 pages
* is 1 Gigabyte. Double everything. It must be a multiple of 8 for PAE.
*/
#ifndef KVA_PAGES
#ifdef PAE
#define KVA_PAGES 512
#else
#define KVA_PAGES 256
#endif
#endif
/*
* Pte related macros
*/
#define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
/* Initial number of kernel page tables. */
#ifndef NKPT
#ifdef PAE
/* 152 page tables needed to map 16G (76B "struct vm_page", 2M page tables). */
#define NKPT 240
#else
/* 18 page tables needed to map 4G (72B "struct vm_page", 4M page tables). */
#define NKPT 30
#endif
#endif
#ifndef NKPDE
#define NKPDE (KVA_PAGES) /* number of page tables/pde's */
#endif
/*
* The *PTDI values control the layout of virtual memory
*
* XXX This works for now, but I am not real happy with it, I'll fix it
* right after I fix locore.s and the magic 28K hole
*/
#define KPTDI (NPDEPTD-NKPDE) /* start of kernel virtual pde's */
#define PTDPTDI (KPTDI-NPGPTD) /* ptd entry that points to ptd! */
/*
* XXX doesn't really belong here I guess...
*/
#define ISA_HOLE_START 0xa0000
#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
#ifndef LOCORE
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#ifdef PAE
typedef uint64_t pdpt_entry_t;
typedef uint64_t pd_entry_t;
typedef uint64_t pt_entry_t;
#define PTESHIFT (3)
#define PDESHIFT (3)
#else
typedef uint32_t pd_entry_t;
typedef uint32_t pt_entry_t;
#define PTESHIFT (2)
#define PDESHIFT (2)
#endif
/*
* Address of current address space page table maps and directories.
*/
#ifdef _KERNEL
extern pt_entry_t PTmap[];
extern pd_entry_t PTD[];
extern pd_entry_t PTDpde[];
#ifdef PAE
extern pdpt_entry_t *IdlePDPT;
#endif
extern pd_entry_t *IdlePTD; /* physical address of "Idle" state directory */
/*
* virtual address to page table entry and
* to physical address.
* Note: these work recursively, thus vtopte of a pte will give
* the corresponding pde that in turn maps it.
*/
#define vtopte(va) (PTmap + i386_btop(va))
#define vtophys(va) pmap_kextract((vm_offset_t)(va))
#ifdef XEN
#include <sys/param.h>
#include <machine/xen/xen-os.h>
#include <machine/xen/xenvar.h>
#include <machine/xen/xenpmap.h>
extern pt_entry_t pg_nx;
#define PG_KERNEL (PG_V | PG_A | PG_RW | PG_M)
#define MACH_TO_VM_PAGE(ma) PHYS_TO_VM_PAGE(xpmap_mtop((ma)))
#define VM_PAGE_TO_MACH(m) xpmap_ptom(VM_PAGE_TO_PHYS((m)))
static __inline vm_paddr_t
pmap_kextract_ma(vm_offset_t va)
{
vm_paddr_t ma;
if ((ma = PTD[va >> PDRSHIFT]) & PG_PS) {
ma = (ma & ~(NBPDR - 1)) | (va & (NBPDR - 1));
} else {
ma = (*vtopte(va) & PG_FRAME) | (va & PAGE_MASK);
}
return ma;
}
static __inline vm_paddr_t
pmap_kextract(vm_offset_t va)
{
return xpmap_mtop(pmap_kextract_ma(va));
}
#define vtomach(va) pmap_kextract_ma(((vm_offset_t) (va)))
vm_paddr_t pmap_extract_ma(struct pmap *pmap, vm_offset_t va);
void pmap_kenter_ma(vm_offset_t va, vm_paddr_t pa);
void pmap_map_readonly(struct pmap *pmap, vm_offset_t va, int len);
void pmap_map_readwrite(struct pmap *pmap, vm_offset_t va, int len);
static __inline pt_entry_t
pte_load_store(pt_entry_t *ptep, pt_entry_t v)
{
pt_entry_t r;
v = xpmap_ptom(v);
r = *ptep;
PT_SET_VA(ptep, v, TRUE);
return (r);
}
static __inline pt_entry_t
pte_load_store_ma(pt_entry_t *ptep, pt_entry_t v)
{
pt_entry_t r;
r = *ptep;
PT_SET_VA_MA(ptep, v, TRUE);
return (r);
}
#define pte_load_clear(ptep) pte_load_store((ptep), (pt_entry_t)0ULL)
#define pte_store(ptep, pte) pte_load_store((ptep), (pt_entry_t)pte)
#define pte_store_ma(ptep, pte) pte_load_store_ma((ptep), (pt_entry_t)pte)
#define pde_store_ma(ptep, pte) pte_load_store_ma((ptep), (pt_entry_t)pte)
#elif !defined(XEN)
/*
* Routine: pmap_kextract
* Function:
* Extract the physical page address associated
* kernel virtual address.
*/
static __inline vm_paddr_t
pmap_kextract(vm_offset_t va)
{
vm_paddr_t pa;
if ((pa = PTD[va >> PDRSHIFT]) & PG_PS) {
pa = (pa & PG_PS_FRAME) | (va & PDRMASK);
} else {
pa = *vtopte(va);
pa = (pa & PG_FRAME) | (va & PAGE_MASK);
}
return pa;
}
#define PT_UPDATES_FLUSH()
#endif
#if defined(PAE) && !defined(XEN)
#define pde_cmpset(pdep, old, new) \
atomic_cmpset_64((pdep), (old), (new))
static __inline pt_entry_t
pte_load(pt_entry_t *ptep)
{
pt_entry_t r;
__asm __volatile(
"lock; cmpxchg8b %1"
: "=A" (r)
: "m" (*ptep), "a" (0), "d" (0), "b" (0), "c" (0));
return (r);
}
static __inline pt_entry_t
pte_load_store(pt_entry_t *ptep, pt_entry_t v)
{
pt_entry_t r;
r = *ptep;
__asm __volatile(
"1:\n"
"\tlock; cmpxchg8b %1\n"
"\tjnz 1b"
: "+A" (r)
: "m" (*ptep), "b" ((uint32_t)v), "c" ((uint32_t)(v >> 32)));
return (r);
}
/* XXXRU move to atomic.h? */
static __inline int
atomic_cmpset_64(volatile uint64_t *dst, uint64_t exp, uint64_t src)
{
int64_t res = exp;
__asm __volatile (
" lock ; "
" cmpxchg8b %2 ; "
" setz %%al ; "
" movzbl %%al,%0 ; "
"# atomic_cmpset_64"
: "+A" (res), /* 0 (result) */
"=m" (*dst) /* 1 */
: "m" (*dst), /* 2 */
"b" ((uint32_t)src),
"c" ((uint32_t)(src >> 32)));
return (res);
}
#define pte_load_clear(ptep) pte_load_store((ptep), (pt_entry_t)0ULL)
#define pte_store(ptep, pte) pte_load_store((ptep), (pt_entry_t)pte)
extern pt_entry_t pg_nx;
#elif !defined(PAE) && !defined (XEN)
#define pde_cmpset(pdep, old, new) \
atomic_cmpset_int((pdep), (old), (new))
static __inline pt_entry_t
pte_load(pt_entry_t *ptep)
{
pt_entry_t r;
r = *ptep;
return (r);
}
static __inline pt_entry_t
pte_load_store(pt_entry_t *ptep, pt_entry_t pte)
{
__asm volatile("xchgl %0, %1" : "+m" (*ptep), "+r" (pte));
return (pte);
}
#define pte_load_clear(pte) atomic_readandclear_int(pte)
static __inline void
pte_store(pt_entry_t *ptep, pt_entry_t pte)
{
*ptep = pte;
}
#endif /* PAE */
#define pte_clear(ptep) pte_store((ptep), (pt_entry_t)0ULL)
#define pde_store(pdep, pde) pte_store((pdep), (pde))
#endif /* _KERNEL */
/*
* Pmap stuff
*/
struct pv_entry;
struct pv_chunk;
struct md_page {
TAILQ_HEAD(,pv_entry) pv_list;
int pat_mode;
};
struct pmap {
struct mtx pm_mtx;
pd_entry_t *pm_pdir; /* KVA of page directory */
TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
u_int pm_active; /* active on cpus */
struct pmap_statistics pm_stats; /* pmap statistics */
LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
#ifdef PAE
pdpt_entry_t *pm_pdpt; /* KVA of page director pointer
table */
#endif
vm_page_t pm_root; /* spare page table pages */
};
typedef struct pmap *pmap_t;
#ifdef _KERNEL
extern struct pmap kernel_pmap_store;
#define kernel_pmap (&kernel_pmap_store)
#define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
#define PMAP_LOCK_ASSERT(pmap, type) \
mtx_assert(&(pmap)->pm_mtx, (type))
#define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
#define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
NULL, MTX_DEF | MTX_DUPOK)
#define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
#define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
#define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
#define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
#endif
/*
* For each vm_page_t, there is a list of all currently valid virtual
* mappings of that page. An entry is a pv_entry_t, the list is pv_list.
*/
typedef struct pv_entry {
vm_offset_t pv_va; /* virtual address for mapping */
TAILQ_ENTRY(pv_entry) pv_list;
} *pv_entry_t;
/*
* pv_entries are allocated in chunks per-process. This avoids the
* need to track per-pmap assignments.
*/
#define _NPCM 11
#define _NPCPV 336
struct pv_chunk {
pmap_t pc_pmap;
TAILQ_ENTRY(pv_chunk) pc_list;
uint32_t pc_map[_NPCM]; /* bitmap; 1 = free */
uint32_t pc_spare[2];
struct pv_entry pc_pventry[_NPCPV];
};
#ifdef _KERNEL
extern caddr_t CADDR1;
extern pt_entry_t *CMAP1;
extern vm_paddr_t phys_avail[];
extern vm_paddr_t dump_avail[];
extern int pseflag;
extern int pgeflag;
extern char *ptvmmap; /* poor name! */
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
#define pmap_page_get_memattr(m) ((vm_memattr_t)(m)->md.pat_mode)
#define pmap_unmapbios(va, sz) pmap_unmapdev((va), (sz))
void pmap_bootstrap(vm_paddr_t);
int pmap_change_attr(vm_offset_t, vm_size_t, int);
void pmap_init_pat(void);
void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
void *pmap_kenter_temporary(vm_paddr_t pa, int i);
void pmap_kremove(vm_offset_t);
void *pmap_mapbios(vm_paddr_t, vm_size_t);
void *pmap_mapdev(vm_paddr_t, vm_size_t);
void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
boolean_t pmap_page_is_mapped(vm_page_t m);
void pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma);
void pmap_unmapdev(vm_offset_t, vm_size_t);
pt_entry_t *pmap_pte(pmap_t, vm_offset_t) __pure2;
void pmap_set_pg(void);
void pmap_invalidate_page(pmap_t, vm_offset_t);
void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
void pmap_invalidate_all(pmap_t);
void pmap_invalidate_cache(void);
#endif /* _KERNEL */
#endif /* !LOCORE */
#endif /* !_MACHINE_PMAP_H_ */
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