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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-um/pgtable.h | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-um/pgtable.h')
-rw-r--r-- | include/asm-um/pgtable.h | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/include/asm-um/pgtable.h b/include/asm-um/pgtable.h new file mode 100644 index 0000000..71f9c0c --- /dev/null +++ b/include/asm-um/pgtable.h @@ -0,0 +1,386 @@ +/* + * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) + * Copyright 2003 PathScale, Inc. + * Derived from include/asm-i386/pgtable.h + * Licensed under the GPL + */ + +#ifndef __UM_PGTABLE_H +#define __UM_PGTABLE_H + +#include "linux/sched.h" +#include "linux/linkage.h" +#include "asm/processor.h" +#include "asm/page.h" +#include "asm/fixmap.h" + +#define _PAGE_PRESENT 0x001 +#define _PAGE_NEWPAGE 0x002 +#define _PAGE_NEWPROT 0x004 +#define _PAGE_FILE 0x008 /* set:pagecache unset:swap */ +#define _PAGE_PROTNONE 0x010 /* If not present */ +#define _PAGE_RW 0x020 +#define _PAGE_USER 0x040 +#define _PAGE_ACCESSED 0x080 +#define _PAGE_DIRTY 0x100 + +#ifdef CONFIG_3_LEVEL_PGTABLES +#include "asm/pgtable-3level.h" +#else +#include "asm/pgtable-2level.h" +#endif + +extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; + +extern void *um_virt_to_phys(struct task_struct *task, unsigned long virt, + pte_t *pte_out); + +/* zero page used for uninitialized stuff */ +extern unsigned long *empty_zero_page; + +#define pgtable_cache_init() do ; while (0) + +/* + * pgd entries used up by user/kernel: + */ + +#define USER_PGD_PTRS (TASK_SIZE >> PGDIR_SHIFT) +#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS) + +#ifndef __ASSEMBLY__ +/* Just any arbitrary offset to the start of the vmalloc VM area: the + * current 8MB value just means that there will be a 8MB "hole" after the + * physical memory until the kernel virtual memory starts. That means that + * any out-of-bounds memory accesses will hopefully be caught. + * The vmalloc() routines leaves a hole of 4kB between each vmalloced + * area for the same reason. ;) + */ + +extern unsigned long end_iomem; + +#define VMALLOC_OFFSET (__va_space) +#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) + +#ifdef CONFIG_HIGHMEM +# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE) +#else +# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) +#endif + +#define REGION_SHIFT (sizeof(pte_t) * 8 - 4) +#define REGION_MASK (((unsigned long) 0xf) << REGION_SHIFT) + +#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) +#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) +#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) + +#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) +#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED) +#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) +#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) +#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) +#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED) + +/* + * The i386 can't do page protection for execute, and considers that the same are read. + * Also, write permissions imply read permissions. This is the closest we can get.. + */ +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_COPY +#define __P011 PAGE_COPY +#define __P100 PAGE_READONLY +#define __P101 PAGE_READONLY +#define __P110 PAGE_COPY +#define __P111 PAGE_COPY + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED +#define __S011 PAGE_SHARED +#define __S100 PAGE_READONLY +#define __S101 PAGE_READONLY +#define __S110 PAGE_SHARED +#define __S111 PAGE_SHARED + +/* + * Define this if things work differently on an i386 and an i486: + * it will (on an i486) warn about kernel memory accesses that are + * done without a 'verify_area(VERIFY_WRITE,..)' + */ +#undef TEST_VERIFY_AREA + +/* page table for 0-4MB for everybody */ +extern unsigned long pg0[1024]; + +/* + * 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_page(void); +extern pte_t * __bad_pagetable(void); + +#define BAD_PAGETABLE __bad_pagetable() +#define BAD_PAGE __bad_page() + +#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) + +/* number of bits that fit into a memory pointer */ +#define BITS_PER_PTR (8*sizeof(unsigned long)) + +/* to align the pointer to a pointer address */ +#define PTR_MASK (~(sizeof(void*)-1)) + +/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */ +/* 64-bit machines, beware! SRB. */ +#define SIZEOF_PTR_LOG2 3 + +/* to find an entry in a page-table */ +#define PAGE_PTR(address) \ +((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK) + +#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE)) + +#define pmd_none(x) (!(pmd_val(x) & ~_PAGE_NEWPAGE)) +#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) +#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) +#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0) + +#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE) +#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE) + +#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE) +#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE) + +#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) + +#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK) + +#define pte_address(x) (__va(pte_val(x) & PAGE_MASK)) +#define mk_phys(a, r) ((a) + (((unsigned long) r) << REGION_SHIFT)) +#define phys_addr(p) ((p) & ~REGION_MASK) + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not.. + */ +static inline int pte_user(pte_t pte) +{ + return((pte_get_bits(pte, _PAGE_USER)) && + !(pte_get_bits(pte, _PAGE_PROTNONE))); +} + +static inline int pte_read(pte_t pte) +{ + return((pte_get_bits(pte, _PAGE_USER)) && + !(pte_get_bits(pte, _PAGE_PROTNONE))); +} + +static inline int pte_exec(pte_t pte){ + return((pte_get_bits(pte, _PAGE_USER)) && + !(pte_get_bits(pte, _PAGE_PROTNONE))); +} + +static inline int pte_write(pte_t pte) +{ + return((pte_get_bits(pte, _PAGE_RW)) && + !(pte_get_bits(pte, _PAGE_PROTNONE))); +} + +/* + * The following only works if pte_present() is not true. + */ +static inline int pte_file(pte_t pte) +{ + return pte_get_bits(pte, _PAGE_FILE); +} + +static inline int pte_dirty(pte_t pte) +{ + return pte_get_bits(pte, _PAGE_DIRTY); +} + +static inline int pte_young(pte_t pte) +{ + return pte_get_bits(pte, _PAGE_ACCESSED); +} + +static inline int pte_newpage(pte_t pte) +{ + return pte_get_bits(pte, _PAGE_NEWPAGE); +} + +static inline int pte_newprot(pte_t pte) +{ + return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT))); +} + +static inline pte_t pte_rdprotect(pte_t pte) +{ + pte_clear_bits(pte, _PAGE_USER); + return(pte_mknewprot(pte)); +} + +static inline pte_t pte_exprotect(pte_t pte) +{ + pte_clear_bits(pte, _PAGE_USER); + return(pte_mknewprot(pte)); +} + +static inline pte_t pte_mkclean(pte_t pte) +{ + pte_clear_bits(pte, _PAGE_DIRTY); + return(pte); +} + +static inline pte_t pte_mkold(pte_t pte) +{ + pte_clear_bits(pte, _PAGE_ACCESSED); + return(pte); +} + +static inline pte_t pte_wrprotect(pte_t pte) +{ + pte_clear_bits(pte, _PAGE_RW); + return(pte_mknewprot(pte)); +} + +static inline pte_t pte_mkread(pte_t pte) +{ + pte_set_bits(pte, _PAGE_RW); + return(pte_mknewprot(pte)); +} + +static inline pte_t pte_mkexec(pte_t pte) +{ + pte_set_bits(pte, _PAGE_USER); + return(pte_mknewprot(pte)); +} + +static inline pte_t pte_mkdirty(pte_t pte) +{ + pte_set_bits(pte, _PAGE_DIRTY); + return(pte); +} + +static inline pte_t pte_mkyoung(pte_t pte) +{ + pte_set_bits(pte, _PAGE_ACCESSED); + return(pte); +} + +static inline pte_t pte_mkwrite(pte_t pte) +{ + pte_set_bits(pte, _PAGE_RW); + return(pte_mknewprot(pte)); +} + +static inline pte_t pte_mkuptodate(pte_t pte) +{ + pte_clear_bits(pte, _PAGE_NEWPAGE); + if(pte_present(pte)) + pte_clear_bits(pte, _PAGE_NEWPROT); + return(pte); +} + +extern phys_t page_to_phys(struct page *page); + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + */ + +extern pte_t mk_pte(struct page *page, pgprot_t pgprot); + +static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) +{ + pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot); + if(pte_present(pte)) pte = pte_mknewpage(pte_mknewprot(pte)); + return pte; +} + +#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) + +/* + * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] + * + * this macro returns the index of the entry in the pgd page which would + * control the given virtual address + */ +#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) + +#define pgd_index_k(addr) pgd_index(addr) + +/* + * pgd_offset() returns a (pgd_t *) + * pgd_index() is used get the offset into the pgd page's array of pgd_t's; + */ +#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) + +/* + * a shortcut which implies the use of the kernel's pgd, instead + * of a process's + */ +#define pgd_offset_k(address) pgd_offset(&init_mm, address) + +/* + * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] + * + * this macro returns the index of the entry in the pmd page which would + * control the given virtual address + */ +#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) + +/* + * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] + * + * this macro returns the index of the entry in the pte page which would + * control the given virtual address + */ +#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_offset_kernel(dir, address) \ + ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address)) +#define pte_offset_map(dir, address) \ + ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address)) +#define pte_offset_map_nested(dir, address) pte_offset_map(dir, address) +#define pte_unmap(pte) do { } while (0) +#define pte_unmap_nested(pte) do { } while (0) + +#define update_mmu_cache(vma,address,pte) do ; while (0) + +/* Encode and de-code a swap entry */ +#define __swp_type(x) (((x).val >> 4) & 0x3f) +#define __swp_offset(x) ((x).val >> 11) + +#define __swp_entry(type, offset) \ + ((swp_entry_t) { ((type) << 4) | ((offset) << 11) }) +#define __pte_to_swp_entry(pte) \ + ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +#define kern_addr_valid(addr) (1) + +#include <asm-generic/pgtable.h> + +#include <asm-generic/pgtable-nopud.h> + +#endif +#endif + +extern struct page *phys_to_page(const unsigned long phys); +extern struct page *__virt_to_page(const unsigned long virt); +#define virt_to_page(addr) __virt_to_page((const unsigned long) addr) + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ |