diff options
Diffstat (limited to 'include/asm-avr32/pgtable.h')
| -rw-r--r-- | include/asm-avr32/pgtable.h | 377 |
1 files changed, 0 insertions, 377 deletions
diff --git a/include/asm-avr32/pgtable.h b/include/asm-avr32/pgtable.h deleted file mode 100644 index fecdda1..0000000 --- a/include/asm-avr32/pgtable.h +++ /dev/null @@ -1,377 +0,0 @@ -/* - * Copyright (C) 2004-2006 Atmel Corporation - * - * 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 __ASM_AVR32_PGTABLE_H -#define __ASM_AVR32_PGTABLE_H - -#include <asm/addrspace.h> - -#ifndef __ASSEMBLY__ -#include <linux/sched.h> - -#endif /* !__ASSEMBLY__ */ - -/* - * Use two-level page tables just as the i386 (without PAE) - */ -#include <asm/pgtable-2level.h> - -/* - * The following code might need some cleanup when the values are - * final... - */ -#define PMD_SIZE (1UL << PMD_SHIFT) -#define PMD_MASK (~(PMD_SIZE-1)) -#define PGDIR_SIZE (1UL << PGDIR_SHIFT) -#define PGDIR_MASK (~(PGDIR_SIZE-1)) - -#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) -#define FIRST_USER_ADDRESS 0 - -#ifndef __ASSEMBLY__ -extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; -extern void paging_init(void); - -/* - * 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) - -/* - * Just any arbitrary offset to the start of the vmalloc VM area: the - * current 8 MiB value just means that there will be a 8 MiB "hole" - * after the uncached physical memory (P2 segment) until the vmalloc - * area starts. That means that any out-of-bounds memory accesses will - * hopefully be caught; we don't know if the end of the P1/P2 segments - * are actually used for anything, but it is anyway safer to let the - * MMU catch these kinds of errors than to rely on the memory bus. - * - * A "hole" of the same size is added to the end of the P3 segment as - * well. It might seem wasteful to use 16 MiB of virtual address space - * on this, but we do have 512 MiB of it... - * - * The vmalloc() routines leave a hole of 4 KiB between each vmalloced - * area for the same reason. - */ -#define VMALLOC_OFFSET (8 * 1024 * 1024) -#define VMALLOC_START (P3SEG + VMALLOC_OFFSET) -#define VMALLOC_END (P4SEG - VMALLOC_OFFSET) -#endif /* !__ASSEMBLY__ */ - -/* - * Page flags. Some of these flags are not directly supported by - * hardware, so we have to emulate them. - */ -#define _TLBEHI_BIT_VALID 9 -#define _TLBEHI_VALID (1 << _TLBEHI_BIT_VALID) - -#define _PAGE_BIT_WT 0 /* W-bit : write-through */ -#define _PAGE_BIT_DIRTY 1 /* D-bit : page changed */ -#define _PAGE_BIT_SZ0 2 /* SZ0-bit : Size of page */ -#define _PAGE_BIT_SZ1 3 /* SZ1-bit : Size of page */ -#define _PAGE_BIT_EXECUTE 4 /* X-bit : execute access allowed */ -#define _PAGE_BIT_RW 5 /* AP0-bit : write access allowed */ -#define _PAGE_BIT_USER 6 /* AP1-bit : user space access allowed */ -#define _PAGE_BIT_BUFFER 7 /* B-bit : bufferable */ -#define _PAGE_BIT_GLOBAL 8 /* G-bit : global (ignore ASID) */ -#define _PAGE_BIT_CACHABLE 9 /* C-bit : cachable */ - -/* If we drop support for 1K pages, we get two extra bits */ -#define _PAGE_BIT_PRESENT 10 -#define _PAGE_BIT_ACCESSED 11 /* software: page was accessed */ - -/* The following flags are only valid when !PRESENT */ -#define _PAGE_BIT_FILE 0 /* software: pagecache or swap? */ - -#define _PAGE_WT (1 << _PAGE_BIT_WT) -#define _PAGE_DIRTY (1 << _PAGE_BIT_DIRTY) -#define _PAGE_EXECUTE (1 << _PAGE_BIT_EXECUTE) -#define _PAGE_RW (1 << _PAGE_BIT_RW) -#define _PAGE_USER (1 << _PAGE_BIT_USER) -#define _PAGE_BUFFER (1 << _PAGE_BIT_BUFFER) -#define _PAGE_GLOBAL (1 << _PAGE_BIT_GLOBAL) -#define _PAGE_CACHABLE (1 << _PAGE_BIT_CACHABLE) - -/* Software flags */ -#define _PAGE_ACCESSED (1 << _PAGE_BIT_ACCESSED) -#define _PAGE_PRESENT (1 << _PAGE_BIT_PRESENT) -#define _PAGE_FILE (1 << _PAGE_BIT_FILE) - -/* - * Page types, i.e. sizes. _PAGE_TYPE_NONE corresponds to what is - * usually called _PAGE_PROTNONE on other architectures. - * - * XXX: Find out if _PAGE_PROTNONE is equivalent with !_PAGE_USER. If - * so, we can encode all possible page sizes (although we can't really - * support 1K pages anyway due to the _PAGE_PRESENT and _PAGE_ACCESSED - * bits) - * - */ -#define _PAGE_TYPE_MASK ((1 << _PAGE_BIT_SZ0) | (1 << _PAGE_BIT_SZ1)) -#define _PAGE_TYPE_NONE (0 << _PAGE_BIT_SZ0) -#define _PAGE_TYPE_SMALL (1 << _PAGE_BIT_SZ0) -#define _PAGE_TYPE_MEDIUM (2 << _PAGE_BIT_SZ0) -#define _PAGE_TYPE_LARGE (3 << _PAGE_BIT_SZ0) - -/* - * Mask which drop software flags. We currently can't handle more than - * 512 MiB of physical memory, so we can use bits 29-31 for other - * stuff. With a fixed 4K page size, we can use bits 10-11 as well as - * bits 2-3 (SZ) - */ -#define _PAGE_FLAGS_HARDWARE_MASK 0xfffff3ff - -#define _PAGE_FLAGS_CACHE_MASK (_PAGE_CACHABLE | _PAGE_BUFFER | _PAGE_WT) - -/* Flags that may be modified by software */ -#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY \ - | _PAGE_FLAGS_CACHE_MASK) - -#define _PAGE_FLAGS_READ (_PAGE_CACHABLE | _PAGE_BUFFER) -#define _PAGE_FLAGS_WRITE (_PAGE_FLAGS_READ | _PAGE_RW | _PAGE_DIRTY) - -#define _PAGE_NORMAL(x) __pgprot((x) | _PAGE_PRESENT | _PAGE_TYPE_SMALL \ - | _PAGE_ACCESSED) - -#define PAGE_NONE (_PAGE_ACCESSED | _PAGE_TYPE_NONE) -#define PAGE_READ (_PAGE_FLAGS_READ | _PAGE_USER) -#define PAGE_EXEC (_PAGE_FLAGS_READ | _PAGE_EXECUTE | _PAGE_USER) -#define PAGE_WRITE (_PAGE_FLAGS_WRITE | _PAGE_USER) -#define PAGE_KERNEL _PAGE_NORMAL(_PAGE_FLAGS_WRITE | _PAGE_EXECUTE | _PAGE_GLOBAL) -#define PAGE_KERNEL_RO _PAGE_NORMAL(_PAGE_FLAGS_READ | _PAGE_EXECUTE | _PAGE_GLOBAL) - -#define _PAGE_P(x) _PAGE_NORMAL((x) & ~(_PAGE_RW | _PAGE_DIRTY)) -#define _PAGE_S(x) _PAGE_NORMAL(x) - -#define PAGE_COPY _PAGE_P(PAGE_WRITE | PAGE_READ) -#define PAGE_SHARED _PAGE_S(PAGE_WRITE | PAGE_READ) - -#ifndef __ASSEMBLY__ -/* - * The hardware supports flags for write- and execute access. Read is - * always allowed if the page is loaded into the TLB, so the "-w-", - * "--x" and "-wx" mappings are implemented as "rw-", "r-x" and "rwx", - * respectively. - * - * The "---" case is handled by software; the page will simply not be - * loaded into the TLB if the page type is _PAGE_TYPE_NONE. - */ - -#define __P000 __pgprot(PAGE_NONE) -#define __P001 _PAGE_P(PAGE_READ) -#define __P010 _PAGE_P(PAGE_WRITE) -#define __P011 _PAGE_P(PAGE_WRITE | PAGE_READ) -#define __P100 _PAGE_P(PAGE_EXEC) -#define __P101 _PAGE_P(PAGE_EXEC | PAGE_READ) -#define __P110 _PAGE_P(PAGE_EXEC | PAGE_WRITE) -#define __P111 _PAGE_P(PAGE_EXEC | PAGE_WRITE | PAGE_READ) - -#define __S000 __pgprot(PAGE_NONE) -#define __S001 _PAGE_S(PAGE_READ) -#define __S010 _PAGE_S(PAGE_WRITE) -#define __S011 _PAGE_S(PAGE_WRITE | PAGE_READ) -#define __S100 _PAGE_S(PAGE_EXEC) -#define __S101 _PAGE_S(PAGE_EXEC | PAGE_READ) -#define __S110 _PAGE_S(PAGE_EXEC | PAGE_WRITE) -#define __S111 _PAGE_S(PAGE_EXEC | PAGE_WRITE | PAGE_READ) - -#define pte_none(x) (!pte_val(x)) -#define pte_present(x) (pte_val(x) & _PAGE_PRESENT) - -#define pte_clear(mm,addr,xp) \ - do { \ - set_pte_at(mm, addr, xp, __pte(0)); \ - } while (0) - -/* - * The following only work if pte_present() is true. - * Undefined behaviour if not.. - */ -static inline int pte_write(pte_t pte) -{ - return pte_val(pte) & _PAGE_RW; -} -static inline int pte_dirty(pte_t pte) -{ - return pte_val(pte) & _PAGE_DIRTY; -} -static inline int pte_young(pte_t pte) -{ - return pte_val(pte) & _PAGE_ACCESSED; -} -static inline int pte_special(pte_t pte) -{ - return 0; -} - -/* - * The following only work if pte_present() is not true. - */ -static inline int pte_file(pte_t pte) -{ - return pte_val(pte) & _PAGE_FILE; -} - -/* Mutator functions for PTE bits */ -static inline pte_t pte_wrprotect(pte_t pte) -{ - set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); - return pte; -} -static inline pte_t pte_mkclean(pte_t pte) -{ - set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); - return pte; -} -static inline pte_t pte_mkold(pte_t pte) -{ - set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); - return pte; -} -static inline pte_t pte_mkwrite(pte_t pte) -{ - set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); - return pte; -} -static inline pte_t pte_mkdirty(pte_t pte) -{ - set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); - return pte; -} -static inline pte_t pte_mkyoung(pte_t pte) -{ - set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); - return pte; -} -static inline pte_t pte_mkspecial(pte_t pte) -{ - return pte; -} - -#define pmd_none(x) (!pmd_val(x)) -#define pmd_present(x) (pmd_val(x)) - -static inline void pmd_clear(pmd_t *pmdp) -{ - set_pmd(pmdp, __pmd(0)); -} - -#define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) - -/* - * Permanent address of a page. We don't support highmem, so this is - * trivial. - */ -#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) -#define pte_page(x) (pfn_to_page(pte_pfn(x))) - -/* - * Mark the prot value as uncacheable and unbufferable - */ -#define pgprot_noncached(prot) \ - __pgprot(pgprot_val(prot) & ~(_PAGE_BUFFER | _PAGE_CACHABLE)) - -/* - * Mark the prot value as uncacheable but bufferable - */ -#define pgprot_writecombine(prot) \ - __pgprot((pgprot_val(prot) & ~_PAGE_CACHABLE) | _PAGE_BUFFER) - -/* - * 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) - */ -#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) - -static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) -{ - set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) - | pgprot_val(newprot))); - return pte; -} - -#define page_pte(page) page_pte_prot(page, __pgprot(0)) - -#define pmd_page_vaddr(pmd) pmd_val(pmd) -#define pmd_page(pmd) (virt_to_page(pmd_val(pmd))) - -/* to find an entry in a page-table-directory. */ -#define pgd_index(address) (((address) >> PGDIR_SHIFT) \ - & (PTRS_PER_PGD - 1)) -#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 third-level page table.. */ -#define pte_index(address) \ - ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) -#define pte_offset(dir, address) \ - ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) -#define pte_offset_kernel(dir, address) \ - ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) -#define pte_offset_map(dir, address) pte_offset_kernel(dir, address) -#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address) -#define pte_unmap(pte) do { } while (0) -#define pte_unmap_nested(pte) do { } while (0) - -struct vm_area_struct; -extern void update_mmu_cache(struct vm_area_struct * vma, - unsigned long address, pte_t pte); - -/* - * Encode and decode a swap entry - * - * Constraints: - * _PAGE_FILE at bit 0 - * _PAGE_TYPE_* at bits 2-3 (for emulating _PAGE_PROTNONE) - * _PAGE_PRESENT at bit 10 - * - * We encode the type into bits 4-9 and offset into bits 11-31. This - * gives us a 21 bits offset, or 2**21 * 4K = 8G usable swap space per - * device, and 64 possible types. - * - * NOTE: We should set ZEROs at the position of _PAGE_PRESENT - * and _PAGE_PROTNONE bits - */ -#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) }) -#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) - -/* - * Encode and decode a nonlinear file mapping entry. We have to - * preserve _PAGE_FILE and _PAGE_PRESENT here. _PAGE_TYPE_* isn't - * necessary, since _PAGE_FILE implies !_PAGE_PROTNONE (?) - */ -#define PTE_FILE_MAX_BITS 30 -#define pte_to_pgoff(pte) (((pte_val(pte) >> 1) & 0x1ff) \ - | ((pte_val(pte) >> 11) << 9)) -#define pgoff_to_pte(off) ((pte_t) { ((((off) & 0x1ff) << 1) \ - | (((off) >> 9) << 11) \ - | _PAGE_FILE) }) - -typedef pte_t *pte_addr_t; - -#define kern_addr_valid(addr) (1) - -#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ - remap_pfn_range(vma, vaddr, pfn, size, prot) - -/* No page table caches to initialize (?) */ -#define pgtable_cache_init() do { } while(0) - -#include <asm-generic/pgtable.h> - -#endif /* !__ASSEMBLY__ */ - -#endif /* __ASM_AVR32_PGTABLE_H */ |
