mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Dave McCracken](/assets/img/avatar_default.png)
One of the changes necessary for shared page tables is to standardize the pxx_page macros. pte_page and pmd_page have always returned the struct page associated with their entry, while pte_page_kernel and pmd_page_kernel have returned the kernel virtual address. pud_page and pgd_page, on the other hand, return the kernel virtual address. Shared page tables needs pud_page and pgd_page to return the actual page structures. There are very few actual users of these functions, so it is simple to standardize their usage. Since this is basic cleanup, I am submitting these changes as a standalone patch. Per Hugh Dickins' comments about it, I am also changing the pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning. Signed-off-by: Dave McCracken <dmccr@us.ibm.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
461 lines
14 KiB
C
461 lines
14 KiB
C
/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */
|
|
#ifndef _SPARC_PGTABLE_H
|
|
#define _SPARC_PGTABLE_H
|
|
|
|
/* asm-sparc/pgtable.h: Defines and functions used to work
|
|
* with Sparc page tables.
|
|
*
|
|
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
|
* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
*/
|
|
|
|
#include <asm-generic/4level-fixup.h>
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/swap.h>
|
|
#include <asm/types.h>
|
|
#ifdef CONFIG_SUN4
|
|
#include <asm/pgtsun4.h>
|
|
#else
|
|
#include <asm/pgtsun4c.h>
|
|
#endif
|
|
#include <asm/pgtsrmmu.h>
|
|
#include <asm/vac-ops.h>
|
|
#include <asm/oplib.h>
|
|
#include <asm/btfixup.h>
|
|
#include <asm/system.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
struct vm_area_struct;
|
|
struct page;
|
|
|
|
extern void load_mmu(void);
|
|
extern unsigned long calc_highpages(void);
|
|
|
|
BTFIXUPDEF_SIMM13(pgdir_shift)
|
|
BTFIXUPDEF_SETHI(pgdir_size)
|
|
BTFIXUPDEF_SETHI(pgdir_mask)
|
|
|
|
BTFIXUPDEF_SIMM13(ptrs_per_pmd)
|
|
BTFIXUPDEF_SIMM13(ptrs_per_pgd)
|
|
BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
|
|
|
|
#define pte_ERROR(e) __builtin_trap()
|
|
#define pmd_ERROR(e) __builtin_trap()
|
|
#define pgd_ERROR(e) __builtin_trap()
|
|
|
|
BTFIXUPDEF_INT(page_none)
|
|
BTFIXUPDEF_INT(page_shared)
|
|
BTFIXUPDEF_INT(page_copy)
|
|
BTFIXUPDEF_INT(page_readonly)
|
|
BTFIXUPDEF_INT(page_kernel)
|
|
|
|
#define PMD_SHIFT SUN4C_PMD_SHIFT
|
|
#define PMD_SIZE (1UL << PMD_SHIFT)
|
|
#define PMD_MASK (~(PMD_SIZE-1))
|
|
#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
|
|
#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
|
|
#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
|
|
#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
|
|
#define PTRS_PER_PTE 1024
|
|
#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
|
|
#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
|
|
#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
|
|
#define FIRST_USER_ADDRESS 0
|
|
#define PTE_SIZE (PTRS_PER_PTE*4)
|
|
|
|
#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
|
|
#define PAGE_SHARED __pgprot(BTFIXUP_INT(page_shared))
|
|
#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
|
|
#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
|
|
|
|
extern unsigned long page_kernel;
|
|
|
|
#ifdef MODULE
|
|
#define PAGE_KERNEL page_kernel
|
|
#else
|
|
#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
|
|
#endif
|
|
|
|
/* Top-level page directory */
|
|
extern pgd_t swapper_pg_dir[1024];
|
|
|
|
extern void paging_init(void);
|
|
|
|
/* Page table for 0-4MB for everybody, on the Sparc this
|
|
* holds the same as on the i386.
|
|
*/
|
|
extern pte_t pg0[1024];
|
|
extern pte_t pg1[1024];
|
|
extern pte_t pg2[1024];
|
|
extern pte_t pg3[1024];
|
|
|
|
extern unsigned long ptr_in_current_pgd;
|
|
|
|
/* Here is a trick, since mmap.c need the initializer elements for
|
|
* protection_map[] to be constant at compile time, I set the following
|
|
* to all zeros. I set it to the real values after I link in the
|
|
* appropriate MMU page table routines at boot time.
|
|
*/
|
|
#define __P000 __pgprot(0)
|
|
#define __P001 __pgprot(0)
|
|
#define __P010 __pgprot(0)
|
|
#define __P011 __pgprot(0)
|
|
#define __P100 __pgprot(0)
|
|
#define __P101 __pgprot(0)
|
|
#define __P110 __pgprot(0)
|
|
#define __P111 __pgprot(0)
|
|
|
|
#define __S000 __pgprot(0)
|
|
#define __S001 __pgprot(0)
|
|
#define __S010 __pgprot(0)
|
|
#define __S011 __pgprot(0)
|
|
#define __S100 __pgprot(0)
|
|
#define __S101 __pgprot(0)
|
|
#define __S110 __pgprot(0)
|
|
#define __S111 __pgprot(0)
|
|
|
|
extern int num_contexts;
|
|
|
|
/* First physical page can be anywhere, the following is needed so that
|
|
* va-->pa and vice versa conversions work properly without performance
|
|
* hit for all __pa()/__va() operations.
|
|
*/
|
|
extern unsigned long phys_base;
|
|
extern unsigned long pfn_base;
|
|
|
|
/*
|
|
* BAD_PAGETABLE is used when we need a bogus page-table, while
|
|
* BAD_PAGE is used for a bogus page.
|
|
*
|
|
* ZERO_PAGE is a global shared page that is always zero: used
|
|
* for zero-mapped memory areas etc..
|
|
*/
|
|
extern pte_t * __bad_pagetable(void);
|
|
extern pte_t __bad_page(void);
|
|
extern unsigned long empty_zero_page;
|
|
|
|
#define BAD_PAGETABLE __bad_pagetable()
|
|
#define BAD_PAGE __bad_page()
|
|
#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
|
|
|
|
/*
|
|
*/
|
|
BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
|
|
BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
|
|
|
|
#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
|
|
#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
|
|
|
|
BTFIXUPDEF_SETHI(none_mask)
|
|
BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
|
|
BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
|
|
BTFIXUPDEF_CALL(int, pte_read, pte_t)
|
|
|
|
static inline int pte_none(pte_t pte)
|
|
{
|
|
return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
|
|
}
|
|
|
|
#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
|
|
#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
|
|
#define pte_read(pte) BTFIXUP_CALL(pte_read)(pte)
|
|
|
|
BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
|
|
BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
|
|
BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
|
|
|
|
static inline int pmd_none(pmd_t pmd)
|
|
{
|
|
return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
|
|
}
|
|
|
|
#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
|
|
#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
|
|
#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
|
|
|
|
BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
|
|
BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
|
|
BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
|
|
BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
|
|
|
|
#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
|
|
#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
|
|
#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
|
|
#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
|
|
|
|
/*
|
|
* The following only work if pte_present() is true.
|
|
* Undefined behaviour if not..
|
|
*/
|
|
BTFIXUPDEF_HALF(pte_writei)
|
|
BTFIXUPDEF_HALF(pte_dirtyi)
|
|
BTFIXUPDEF_HALF(pte_youngi)
|
|
|
|
static int pte_write(pte_t pte) __attribute_const__;
|
|
static inline int pte_write(pte_t pte)
|
|
{
|
|
return pte_val(pte) & BTFIXUP_HALF(pte_writei);
|
|
}
|
|
|
|
static int pte_dirty(pte_t pte) __attribute_const__;
|
|
static inline int pte_dirty(pte_t pte)
|
|
{
|
|
return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
|
|
}
|
|
|
|
static int pte_young(pte_t pte) __attribute_const__;
|
|
static inline int pte_young(pte_t pte)
|
|
{
|
|
return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
|
|
}
|
|
|
|
/*
|
|
* The following only work if pte_present() is not true.
|
|
*/
|
|
BTFIXUPDEF_HALF(pte_filei)
|
|
|
|
static int pte_file(pte_t pte) __attribute_const__;
|
|
static inline int pte_file(pte_t pte)
|
|
{
|
|
return pte_val(pte) & BTFIXUP_HALF(pte_filei);
|
|
}
|
|
|
|
/*
|
|
*/
|
|
BTFIXUPDEF_HALF(pte_wrprotecti)
|
|
BTFIXUPDEF_HALF(pte_mkcleani)
|
|
BTFIXUPDEF_HALF(pte_mkoldi)
|
|
|
|
static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
|
|
static inline pte_t pte_wrprotect(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
|
|
}
|
|
|
|
static pte_t pte_mkclean(pte_t pte) __attribute_const__;
|
|
static inline pte_t pte_mkclean(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
|
|
}
|
|
|
|
static pte_t pte_mkold(pte_t pte) __attribute_const__;
|
|
static inline pte_t pte_mkold(pte_t pte)
|
|
{
|
|
return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
|
|
}
|
|
|
|
BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
|
|
BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
|
|
BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
|
|
|
|
#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
|
|
#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
|
|
#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
|
|
|
|
#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
|
|
|
|
BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
|
|
#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
|
|
#define pte_page(pte) pfn_to_page(pte_pfn(pte))
|
|
|
|
/*
|
|
* Conversion functions: convert a page and protection to a page entry,
|
|
* and a page entry and page directory to the page they refer to.
|
|
*/
|
|
BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
|
|
|
|
BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
|
|
BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
|
|
BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
|
|
|
|
#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
|
|
#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
|
|
#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
|
|
|
|
#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
|
|
|
|
BTFIXUPDEF_INT(pte_modify_mask)
|
|
|
|
static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
|
{
|
|
return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
|
|
pgprot_val(newprot));
|
|
}
|
|
|
|
#define pgd_index(address) ((address) >> PGDIR_SHIFT)
|
|
|
|
/* to find an entry in a page-table-directory */
|
|
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
|
|
|
|
/* to find an entry in a kernel page-table-directory */
|
|
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
|
|
|
|
/* Find an entry in the second-level page table.. */
|
|
BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
|
|
#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
|
|
|
|
/* Find an entry in the third-level page table.. */
|
|
BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
|
|
#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
|
|
|
|
/*
|
|
* This shortcut works on sun4m (and sun4d) because the nocache area is static,
|
|
* and sun4c is guaranteed to have no highmem anyway.
|
|
*/
|
|
#define pte_offset_map(d, a) pte_offset_kernel(d,a)
|
|
#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
|
|
|
|
#define pte_unmap(pte) do{}while(0)
|
|
#define pte_unmap_nested(pte) do{}while(0)
|
|
|
|
/* Certain architectures need to do special things when pte's
|
|
* within a page table are directly modified. Thus, the following
|
|
* hook is made available.
|
|
*/
|
|
|
|
BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
|
|
|
|
#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
|
|
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
|
|
|
|
struct seq_file;
|
|
BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
|
|
|
|
#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
|
|
|
|
/* Fault handler stuff... */
|
|
#define FAULT_CODE_PROT 0x1
|
|
#define FAULT_CODE_WRITE 0x2
|
|
#define FAULT_CODE_USER 0x4
|
|
|
|
BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
|
|
|
|
#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
|
|
|
|
BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
|
|
unsigned long, unsigned int)
|
|
BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
|
|
#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
|
|
#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
|
|
|
|
extern int invalid_segment;
|
|
|
|
/* Encode and de-code a swap entry */
|
|
BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
|
|
BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
|
|
BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
|
|
|
|
#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
|
|
#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
|
|
#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
|
|
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
|
|
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
|
|
|
|
/* file-offset-in-pte helpers */
|
|
BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
|
|
BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
|
|
|
|
#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
|
|
#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
|
|
|
|
/*
|
|
* This is made a constant because mm/fremap.c required a constant.
|
|
* Note that layout of these bits is different between sun4c.c and srmmu.c.
|
|
*/
|
|
#define PTE_FILE_MAX_BITS 24
|
|
|
|
/*
|
|
*/
|
|
struct ctx_list {
|
|
struct ctx_list *next;
|
|
struct ctx_list *prev;
|
|
unsigned int ctx_number;
|
|
struct mm_struct *ctx_mm;
|
|
};
|
|
|
|
extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
|
|
extern struct ctx_list ctx_free; /* Head of free list */
|
|
extern struct ctx_list ctx_used; /* Head of used contexts list */
|
|
|
|
#define NO_CONTEXT -1
|
|
|
|
static inline void remove_from_ctx_list(struct ctx_list *entry)
|
|
{
|
|
entry->next->prev = entry->prev;
|
|
entry->prev->next = entry->next;
|
|
}
|
|
|
|
static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
|
|
{
|
|
entry->next = head;
|
|
(entry->prev = head->prev)->next = entry;
|
|
head->prev = entry;
|
|
}
|
|
#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
|
|
#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
|
|
|
|
static inline unsigned long
|
|
__get_phys (unsigned long addr)
|
|
{
|
|
switch (sparc_cpu_model){
|
|
case sun4:
|
|
case sun4c:
|
|
return sun4c_get_pte (addr) << PAGE_SHIFT;
|
|
case sun4m:
|
|
case sun4d:
|
|
return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static inline int
|
|
__get_iospace (unsigned long addr)
|
|
{
|
|
switch (sparc_cpu_model){
|
|
case sun4:
|
|
case sun4c:
|
|
return -1; /* Don't check iospace on sun4c */
|
|
case sun4m:
|
|
case sun4d:
|
|
return (srmmu_get_pte (addr) >> 28);
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
extern unsigned long *sparc_valid_addr_bitmap;
|
|
|
|
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
|
|
#define kern_addr_valid(addr) \
|
|
(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
|
|
|
|
extern int io_remap_pfn_range(struct vm_area_struct *vma,
|
|
unsigned long from, unsigned long pfn,
|
|
unsigned long size, pgprot_t prot);
|
|
|
|
/*
|
|
* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
|
|
* its high 4 bits. These macros/functions put it there or get it from there.
|
|
*/
|
|
#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
|
|
#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
|
|
#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
|
|
#endif /* !(__ASSEMBLY__) */
|
|
|
|
/* We provide our own get_unmapped_area to cope with VA holes for userland */
|
|
#define HAVE_ARCH_UNMAPPED_AREA
|
|
|
|
/*
|
|
* No page table caches to initialise
|
|
*/
|
|
#define pgtable_cache_init() do { } while (0)
|
|
|
|
#endif /* !(_SPARC_PGTABLE_H) */
|