3153e878dd
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)
329 lines
10 KiB
C
329 lines
10 KiB
C
/*-
|
|
* Copyright (c) 2003 Peter Wemm.
|
|
* 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=2M) */
|
|
#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 */
|
|
#define PG_NX (1ul<<63) /* No-execute */
|
|
|
|
|
|
/* Our various interpretations of the above */
|
|
#define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
|
|
#define PG_MANAGED PG_AVAIL2
|
|
#define PG_FRAME (0x000ffffffffff000ul)
|
|
#define PG_PS_FRAME (0x000fffffffe00000ul)
|
|
#define PG_PROT (PG_RW|PG_U) /* all protection bits . */
|
|
#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
|
|
|
|
/* Page level cache control fields used to determine the PAT type */
|
|
#define PG_PDE_CACHE (PG_PDE_PAT | PG_NC_PWT | PG_NC_PCD)
|
|
#define PG_PTE_CACHE (PG_PTE_PAT | PG_NC_PWT | PG_NC_PCD)
|
|
|
|
/*
|
|
* Promotion to a 2MB (PDE) page mapping requires that the corresponding 4KB
|
|
* (PTE) page mappings have identical settings for the following fields:
|
|
*/
|
|
#define PG_PTE_PROMOTE (PG_NX | 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 */
|
|
|
|
/*
|
|
* Pte related macros. This is complicated by having to deal with
|
|
* the sign extension of the 48th bit.
|
|
*/
|
|
#define KVADDR(l4, l3, l2, l1) ( \
|
|
((unsigned long)-1 << 47) | \
|
|
((unsigned long)(l4) << PML4SHIFT) | \
|
|
((unsigned long)(l3) << PDPSHIFT) | \
|
|
((unsigned long)(l2) << PDRSHIFT) | \
|
|
((unsigned long)(l1) << PAGE_SHIFT))
|
|
|
|
#define UVADDR(l4, l3, l2, l1) ( \
|
|
((unsigned long)(l4) << PML4SHIFT) | \
|
|
((unsigned long)(l3) << PDPSHIFT) | \
|
|
((unsigned long)(l2) << PDRSHIFT) | \
|
|
((unsigned long)(l1) << PAGE_SHIFT))
|
|
|
|
/* Initial number of kernel page tables. */
|
|
#ifndef NKPT
|
|
#define NKPT 32
|
|
#endif
|
|
|
|
#define NKPML4E 1 /* number of kernel PML4 slots */
|
|
#define NKPDPE howmany(NKPT, NPDEPG)/* number of kernel PDP slots */
|
|
|
|
#define NUPML4E (NPML4EPG/2) /* number of userland PML4 pages */
|
|
#define NUPDPE (NUPML4E*NPDPEPG)/* number of userland PDP pages */
|
|
#define NUPDE (NUPDPE*NPDEPG) /* number of userland PD entries */
|
|
|
|
#define NDMPML4E 1 /* number of dmap PML4 slots */
|
|
|
|
/*
|
|
* The *PDI values control the layout of virtual memory
|
|
*/
|
|
#define PML4PML4I (NPML4EPG/2) /* Index of recursive pml4 mapping */
|
|
|
|
#define KPML4I (NPML4EPG-1) /* Top 512GB for KVM */
|
|
#define DMPML4I (KPML4I-1) /* Next 512GB down for direct map */
|
|
|
|
#define KPDPI (NPDPEPG-2) /* kernbase at -2GB */
|
|
|
|
/*
|
|
* 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>
|
|
|
|
typedef u_int64_t pd_entry_t;
|
|
typedef u_int64_t pt_entry_t;
|
|
typedef u_int64_t pdp_entry_t;
|
|
typedef u_int64_t pml4_entry_t;
|
|
|
|
#define PML4ESHIFT (3)
|
|
#define PDPESHIFT (3)
|
|
#define PTESHIFT (3)
|
|
#define PDESHIFT (3)
|
|
|
|
/*
|
|
* Address of current address space page table maps and directories.
|
|
*/
|
|
#ifdef _KERNEL
|
|
#define addr_PTmap (KVADDR(PML4PML4I, 0, 0, 0))
|
|
#define addr_PDmap (KVADDR(PML4PML4I, PML4PML4I, 0, 0))
|
|
#define addr_PDPmap (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, 0))
|
|
#define addr_PML4map (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I))
|
|
#define addr_PML4pml4e (addr_PML4map + (PML4PML4I * sizeof(pml4_entry_t)))
|
|
#define PTmap ((pt_entry_t *)(addr_PTmap))
|
|
#define PDmap ((pd_entry_t *)(addr_PDmap))
|
|
#define PDPmap ((pd_entry_t *)(addr_PDPmap))
|
|
#define PML4map ((pd_entry_t *)(addr_PML4map))
|
|
#define PML4pml4e ((pd_entry_t *)(addr_PML4pml4e))
|
|
|
|
extern u_int64_t KPML4phys; /* physical address of kernel level 4 */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
pt_entry_t *vtopte(vm_offset_t);
|
|
#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
|
|
|
|
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)
|
|
{
|
|
pt_entry_t r;
|
|
|
|
__asm __volatile(
|
|
"xchgq %0,%1"
|
|
: "=m" (*ptep),
|
|
"=r" (r)
|
|
: "1" (pte),
|
|
"m" (*ptep));
|
|
return (r);
|
|
}
|
|
|
|
#define pte_load_clear(pte) atomic_readandclear_long(pte)
|
|
|
|
static __inline void
|
|
pte_store(pt_entry_t *ptep, pt_entry_t pte)
|
|
{
|
|
|
|
*ptep = pte;
|
|
}
|
|
|
|
#define pte_clear(ptep) pte_store((ptep), (pt_entry_t)0ULL)
|
|
|
|
#define pde_store(pdep, pde) pte_store((pdep), (pde))
|
|
|
|
extern pt_entry_t pg_nx;
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Pmap stuff
|
|
*/
|
|
struct pv_entry;
|
|
struct pv_chunk;
|
|
|
|
struct md_page {
|
|
TAILQ_HEAD(,pv_entry) pv_list;
|
|
int pat_mode;
|
|
};
|
|
|
|
/*
|
|
* The kernel virtual address (KVA) of the level 4 page table page is always
|
|
* within the direct map (DMAP) region.
|
|
*/
|
|
struct pmap {
|
|
struct mtx pm_mtx;
|
|
pml4_entry_t *pm_pml4; /* KVA of level 4 page table */
|
|
TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
|
|
u_int pm_active; /* active on cpus */
|
|
/* spare u_int here due to padding */
|
|
struct pmap_statistics pm_stats; /* pmap statistics */
|
|
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 3
|
|
#define _NPCPV 168
|
|
struct pv_chunk {
|
|
pmap_t pc_pmap;
|
|
TAILQ_ENTRY(pv_chunk) pc_list;
|
|
uint64_t pc_map[_NPCM]; /* bitmap; 1 = free */
|
|
uint64_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 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);
|
|
vm_paddr_t pmap_kextract(vm_offset_t);
|
|
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);
|
|
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_ */
|