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Diffstat (limited to 'include/asm-arm26/pgtable.h')
| -rw-r--r-- | include/asm-arm26/pgtable.h | 298 |
1 files changed, 0 insertions, 298 deletions
diff --git a/include/asm-arm26/pgtable.h b/include/asm-arm26/pgtable.h deleted file mode 100644 index 55a1a697d12b..000000000000 --- a/include/asm-arm26/pgtable.h +++ /dev/null @@ -1,298 +0,0 @@ -/* - * linux/include/asm-arm26/pgtable.h - * - * Copyright (C) 2000-2002 Russell King - * Copyright (C) 2003 Ian Molton - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#ifndef _ASMARM_PGTABLE_H -#define _ASMARM_PGTABLE_H - -#include <asm-generic/4level-fixup.h> - -#include <asm/memory.h> - -/* - * The table below defines the page protection levels that we insert into our - * Linux page table version. These get translated into the best that the - * architecture can perform. Note that on most ARM hardware: - * 1) We cannot do execute protection - * 2) If we could do execute protection, then read is implied - * 3) write implies read permissions - */ -#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 - -/* - * PMD_SHIFT determines the size of the area a second-level page table can map - * PGDIR_SHIFT determines what a third-level page table entry can map - */ -#define PGD_SHIFT 25 -#define PMD_SHIFT 20 - -#define PGD_SIZE (1UL << PGD_SHIFT) -#define PGD_MASK (~(PGD_SIZE-1)) -#define PMD_SIZE (1UL << PMD_SHIFT) -#define PMD_MASK (~(PMD_SIZE-1)) - -/* The kernel likes to use these names for the above (ick) */ -#define PGDIR_SIZE PGD_SIZE -#define PGDIR_MASK PGD_MASK - -#define PTRS_PER_PGD 32 -#define PTRS_PER_PMD 1 -#define PTRS_PER_PTE 32 - -/* - * This is the lowest virtual address we can permit any user space - * mapping to be mapped at. This is particularly important for - * non-high vector CPUs. - */ -#define FIRST_USER_ADDRESS PAGE_SIZE - -#define FIRST_USER_PGD_NR 1 -#define USER_PTRS_PER_PGD ((TASK_SIZE/PGD_SIZE) - FIRST_USER_PGD_NR) - -// FIXME - WTF? -#define LIBRARY_TEXT_START 0x0c000000 - - - -#ifndef __ASSEMBLY__ -extern void __pte_error(const char *file, int line, unsigned long val); -extern void __pmd_error(const char *file, int line, unsigned long val); -extern void __pgd_error(const char *file, int line, unsigned long val); - -#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) -#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) -#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) - -/* - * ZERO_PAGE is a global shared page that is always zero: used - * for zero-mapped memory areas etc.. - */ -extern struct page *empty_zero_page; -#define ZERO_PAGE(vaddr) (empty_zero_page) - -#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) -#define pte_page(pte) (pfn_to_page(pte_pfn(pte))) -#define pfn_pte(pfn,prot) (__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))) -#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) -#define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) - -/* - * Terminology: PGD = Page Directory, PMD = Page Middle Directory, - * PTE = Page Table Entry - * - * on arm26 we have no 2nd level page table. we simulate this by removing the - * PMD. - * - * pgd_none is 0 to prevernt pmd_alloc() calling __pmd_alloc(). This causes it - * to return pmd_offset(pgd,addr) which is a pointer to the pgd (IOW, a no-op). - * - * however, to work this way, whilst we are allocating 32 pgds, containing 32 - * PTEs, the actual work is done on the PMDs, thus: - * - * instead of mm->pgd->pmd->pte - * we have mm->pgdpmd->pte - * - * IOW, think of PGD operations and PMD ones as being the same thing, just - * that PGD stuff deals with the mm_struct side of things, wheras PMD stuff - * deals with the pte side of things. - * - * additionally, we store some bits in the PGD and PTE pointers: - * PGDs: - * o The lowest (1) bit of the PGD is to determine if it is present or swap. - * o The 2nd bit of the PGD is unused and must be zero. - * o The top 6 bits of the PGD must be zero. - * PTEs: - * o The lower 5 bits of a pte are flags. bit 1 is the 'present' flag. The - * others determine the pages attributes. - * - * the pgd_val, pmd_val, and pte_val macros seem to be private to our code. - * They get the RAW value of the PGD/PMD/PTE entry, including our flags - * encoded into the pointers. - * - * The pgd_offset, pmd_offset, and pte_offset macros are used by the kernel, - * so they shouldnt have our flags attached. - * - * If you understood that, feel free to explain it to me... - * - */ - -#define _PMD_PRESENT (0x01) - -/* These definitions allow us to optimise out stuff like pmd_alloc() */ -#define pgd_none(pgd) (0) -#define pgd_bad(pgd) (0) -#define pgd_present(pgd) (1) -#define pgd_clear(pgdp) do { } while (0) - -/* Whilst these handle our actual 'page directory' (the agglomeration of pgd and pmd) - */ -#define pmd_none(pmd) (!pmd_val(pmd)) -#define pmd_bad(pmd) ((pmd_val(pmd) & 0xfc000002)) -#define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT) -#define set_pmd(pmd_ptr, pmd) ((*(pmd_ptr)) = (pmd)) -#define pmd_clear(pmdp) set_pmd(pmdp, __pmd(0)) - -/* and these handle our pte tables */ -#define pte_none(pte) (!pte_val(pte)) -#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) -#define set_pte(pte_ptr, pte) ((*(pte_ptr)) = (pte)) -#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) -#define pte_clear(mm,addr,ptep) set_pte_at((mm),(addr),(ptep), __pte(0)) - -/* macros to ease the getting of pointers to stuff... */ -#define pgd_offset(mm, addr) ((pgd_t *)(mm)->pgd + __pgd_index(addr)) -#define pmd_offset(pgd, addr) ((pmd_t *)(pgd)) -#define pte_offset(pmd, addr) ((pte_t *)pmd_page(*(pmd)) + __pte_index(addr)) - -/* there is no __pmd_index as we dont use pmds */ -#define __pgd_index(addr) ((addr) >> PGD_SHIFT) -#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) - - -/* Keep the kernel happy */ -#define pgd_index(addr) __pgd_index(addr) -#define pgd_offset_k(addr) (pgd_offset(&init_mm, addr)) - -/* - * The vmalloc() routines leaves a hole of 4kB between each vmalloced - * area for the same reason. ;) FIXME: surely 1 page not 4k ? - */ -#define VMALLOC_START 0x01a00000 -#define VMALLOC_END 0x01c00000 - -/* Is pmd_page supposed to return a pointer to a page in some arches? ours seems to - * return a pointer to memory (no special alignment) - */ -#define pmd_page(pmd) ((struct page *)(pmd_val((pmd)) & ~_PMD_PRESENT)) -#define pmd_page_vaddr(pmd) ((pte_t *)(pmd_val((pmd)) & ~_PMD_PRESENT)) - -#define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) - -#define pte_offset_map(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) -#define pte_offset_map_nested(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) -#define pte_unmap(pte) do { } while (0) -#define pte_unmap_nested(pte) do { } while (0) - - -#define _PAGE_PRESENT 0x01 -#define _PAGE_READONLY 0x02 -#define _PAGE_NOT_USER 0x04 -#define _PAGE_OLD 0x08 -#define _PAGE_CLEAN 0x10 - -// an old page has never been read. -// a clean page has never been written. - -/* -- present -- -- !dirty -- --- !write --- ---- !user --- */ -#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY | _PAGE_NOT_USER) -#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CLEAN ) -#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY ) -#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY ) -#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_NOT_USER) - -#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_OLD | _PAGE_CLEAN) - -/* - * The following only work if pte_present() is true. - * Undefined behaviour if not.. - */ -#define pte_write(pte) (!(pte_val(pte) & _PAGE_READONLY)) -#define pte_dirty(pte) (!(pte_val(pte) & _PAGE_CLEAN)) -#define pte_young(pte) (!(pte_val(pte) & _PAGE_OLD)) -//ONLY when !pte_present() I think. nicked from arm32 (FIXME!) -#define pte_file(pte) (!(pte_val(pte) & _PAGE_OLD)) - -#define PTE_BIT_FUNC(fn,op) \ -static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } - -PTE_BIT_FUNC(wrprotect, |= _PAGE_READONLY); -PTE_BIT_FUNC(mkwrite, &= ~_PAGE_READONLY); -PTE_BIT_FUNC(mkclean, |= _PAGE_CLEAN); -PTE_BIT_FUNC(mkdirty, &= ~_PAGE_CLEAN); -PTE_BIT_FUNC(mkold, |= _PAGE_OLD); -PTE_BIT_FUNC(mkyoung, &= ~_PAGE_OLD); - -/* - * We don't store cache state bits in the page table here. FIXME - or do we? - */ -#define pgprot_noncached(prot) (prot) -#define pgprot_writecombine(prot) (prot) //FIXME - is a no-op? - -extern void pgtable_cache_init(void); - -//FIXME - nicked from arm32 and brutally hacked. probably wrong. -#define pte_to_pgoff(x) (pte_val(x) >> 2) -#define pgoff_to_pte(x) __pte(((x) << 2) & ~_PAGE_OLD) - -//FIXME - next line borrowed from arm32. is it right? -#define PTE_FILE_MAX_BITS 30 - - -static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) -{ - pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); - return pte; -} - -extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; - -/* Encode and decode a swap entry. - * - * We support up to 32GB of swap on 4k machines - */ -#define __swp_type(x) (((x).val >> 2) & 0x7f) -#define __swp_offset(x) ((x).val >> 9) -#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 2) | ((offset) << 9) }) -#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) -#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) - -/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ -/* FIXME: this is not correct */ -#define kern_addr_valid(addr) (1) - -/* - * Conversion functions: convert a page and protection to a page entry, - * and a page entry and page directory to the page they refer to. - */ -static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) -{ - pte_t pte; - pte_val(pte) = physpage | pgprot_val(pgprot); - return pte; -} - - -#include <asm-generic/pgtable.h> - -/* - * remap a physical page `pfn' of size `size' with page protection `prot' - * into virtual address `from' - */ -#define io_remap_pfn_range(vma,from,pfn,size,prot) \ - remap_pfn_range(vma, from, pfn, size, prot) - -#endif /* !__ASSEMBLY__ */ - -#endif /* _ASMARM_PGTABLE_H */ |