pgtable.h
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上传日期:2013-04-10
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- #ifndef _PPC64_PGTABLE_H
- #define _PPC64_PGTABLE_H
- /*
- * This file contains the functions and defines necessary to modify and use
- * the ppc64 hashed page table.
- */
- #ifndef __ASSEMBLY__
- #include <asm/processor.h> /* For TASK_SIZE */
- #include <asm/mmu.h>
- #include <asm/page.h>
- #endif /* __ASSEMBLY__ */
- /* PMD_SHIFT determines what a second-level page table entry can map */
- #define PMD_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
- #define PMD_SIZE (1UL << PMD_SHIFT)
- #define PMD_MASK (~(PMD_SIZE-1))
- /* PGDIR_SHIFT determines what a third-level page table entry can map */
- #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3) + (PAGE_SHIFT - 2))
- #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
- #define PGDIR_MASK (~(PGDIR_SIZE-1))
- /*
- * Entries per page directory level. The PTE level must use a 64b record
- * for each page table entry. The PMD and PGD level use a 32b record for
- * each entry by assuming that each entry is page aligned.
- */
- #define PTE_INDEX_SIZE 9
- #define PMD_INDEX_SIZE 10
- #define PGD_INDEX_SIZE 10
- #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
- #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
- #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
- #if 0
- /* DRENG / PPPBBB This is a compiler bug!!! */
- #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
- #else
- #define USER_PTRS_PER_PGD (1024)
- #endif
- #define FIRST_USER_PGD_NR 0
- #define EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE +
- PGD_INDEX_SIZE + PAGE_SHIFT)
- /*
- * Define the address range of the vmalloc VM area.
- */
- #define VMALLOC_START (0xD000000000000000)
- #define VMALLOC_VMADDR(x) ((unsigned long)(x))
- #define VMALLOC_END (VMALLOC_START + VALID_EA_BITS)
- /*
- * Define the address range of the imalloc VM area.
- * (used for ioremap)
- */
- #define IMALLOC_START (ioremap_bot)
- #define IMALLOC_VMADDR(x) ((unsigned long)(x))
- #define IMALLOC_BASE (0xE000000000000000)
- #define IMALLOC_END (IMALLOC_BASE + VALID_EA_BITS)
- /*
- * Define the address range mapped virt <-> physical
- */
- #define KRANGE_START KERNELBASE
- #define KRANGE_END (KRANGE_START + VALID_EA_BITS)
- /*
- * Define the user address range
- */
- #define USER_START (0UL)
- #define USER_END (USER_START + VALID_EA_BITS)
- /*
- * Bits in a linux-style PTE. These match the bits in the
- * (hardware-defined) PowerPC PTE as closely as possible.
- */
- #define _PAGE_PRESENT 0x001UL /* software: pte contains a translation */
- #define _PAGE_USER 0x002UL /* matches one of the PP bits */
- #define _PAGE_RW 0x004UL /* software: user write access allowed */
- #define _PAGE_GUARDED 0x008UL
- #define _PAGE_COHERENT 0x010UL /* M: enforce memory coherence (SMP systems) */
- #define _PAGE_NO_CACHE 0x020UL /* I: cache inhibit */
- #define _PAGE_WRITETHRU 0x040UL /* W: cache write-through */
- #define _PAGE_DIRTY 0x080UL /* C: page changed */
- #define _PAGE_ACCESSED 0x100UL /* R: page referenced */
- #define _PAGE_HPTENOIX 0x200UL /* software: pte HPTE slot unknown */
- #define _PAGE_HASHPTE 0x400UL /* software: pte has an associated HPTE */
- #define _PAGE_EXEC 0x800UL /* software: i-cache coherence required */
- #define _PAGE_SECONDARY 0x8000UL /* software: HPTE is in secondary group */
- #define _PAGE_GROUP_IX 0x7000UL /* software: HPTE index within group */
- /* Bits 0x7000 identify the index within an HPT Group */
- #define _PAGE_HPTEFLAGS (_PAGE_HASHPTE | _PAGE_HPTENOIX | _PAGE_SECONDARY | _PAGE_GROUP_IX)
- /* PAGE_MASK gives the right answer below, but only by accident */
- /* It should be preserving the high 48 bits and then specifically */
- /* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
- #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HPTEFLAGS)
- #define _PAGE_BASE _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT
- #define _PAGE_WRENABLE _PAGE_RW | _PAGE_DIRTY
- /* __pgprot defined in asm-ppc64/page.h */
- #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
- #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
- #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
- #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
- #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
- #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
- #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
- #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_WRENABLE)
- #define PAGE_KERNEL_CI __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED |
- _PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
- /*
- * The PowerPC can only do execute protection on a segment (256MB) basis,
- * not on a page basis. So we consider execute permission the same as read.
- * Also, write permissions imply read permissions.
- * This is the closest we can get..
- */
- #define __P000 PAGE_NONE
- #define __P001 PAGE_READONLY_X
- #define __P010 PAGE_COPY
- #define __P011 PAGE_COPY_X
- #define __P100 PAGE_READONLY
- #define __P101 PAGE_READONLY_X
- #define __P110 PAGE_COPY
- #define __P111 PAGE_COPY_X
- #define __S000 PAGE_NONE
- #define __S001 PAGE_READONLY_X
- #define __S010 PAGE_SHARED
- #define __S011 PAGE_SHARED_X
- #define __S100 PAGE_READONLY
- #define __S101 PAGE_READONLY_X
- #define __S110 PAGE_SHARED
- #define __S111 PAGE_SHARED_X
- #ifndef __ASSEMBLY__
- /*
- * ZERO_PAGE is a global shared page that is always zero: used
- * for zero-mapped memory areas etc..
- */
- extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
- #define ZERO_PAGE(vaddr) (mem_map + MAP_NR(empty_zero_page))
- #endif /* __ASSEMBLY__ */
- /* shift to put page number into pte */
- #define PTE_SHIFT (16)
- #ifndef __ASSEMBLY__
- /*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- *
- * mk_pte_phys takes a physical address as input
- *
- * mk_pte takes a (struct page *) as input
- */
- #define mk_pte_phys(physpage,pgprot)
- ({
- pte_t pte;
- pte_val(pte) = (((physpage)<<(PTE_SHIFT-PAGE_SHIFT)) | pgprot_val(pgprot));
- pte;
- })
- #define mk_pte(page,pgprot)
- ({
- pte_t pte;
- pte_val(pte) = ((unsigned long)((page) - mem_map) << PTE_SHIFT) |
- pgprot_val(pgprot);
- pte;
- })
- #define pte_modify(_pte, newprot)
- (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
- #define pte_none(pte) ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
- #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
- /* pte_clear moved to later in this file */
- #define pte_pagenr(x) ((unsigned long)((pte_val(x) >> PTE_SHIFT)))
- #define pte_page(x) (mem_map+pte_pagenr(x))
- #define pmd_set(pmdp, ptep) (pmd_val(*(pmdp)) = (__ba_to_bpn(ptep)))
- #define pmd_none(pmd) (!pmd_val(pmd))
- #define pmd_bad(pmd) ((pmd_val(pmd)) == 0)
- #define pmd_present(pmd) ((pmd_val(pmd)) != 0)
- #define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0)
- #define pmd_page(pmd) (__bpn_to_ba(pmd_val(pmd)))
- #define pgd_set(pgdp, pmdp) (pgd_val(*(pgdp)) = (__ba_to_bpn(pmdp)))
- #define pgd_none(pgd) (!pgd_val(pgd))
- #define pgd_bad(pgd) ((pgd_val(pgd)) == 0)
- #define pgd_present(pgd) (pgd_val(pgd) != 0UL)
- #define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL)
- #define pgd_page(pgd) (__bpn_to_ba(pgd_val(pgd)))
- /*
- * Find an entry in a page-table-directory. We combine the address region
- * (the high order N bits) and the pgd portion of the address.
- */
- #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD -1))
- #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
- /* Find an entry in the second-level page table.. */
- #define pmd_offset(dir,addr)
- ((pmd_t *) pgd_page(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
- /* Find an entry in the third-level page table.. */
- #define pte_offset(dir,addr)
- ((pte_t *) pmd_page(*(dir)) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
- /* to find an entry in a kernel page-table-directory */
- /* This now only contains the vmalloc pages */
- #define pgd_offset_k(address) pgd_offset(&init_mm, address)
- /* to find an entry in the ioremap page-table-directory */
- #define pgd_offset_i(address) (ioremap_pgd + pgd_index(address))
- #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
- /*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
- */
- static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER;}
- static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
- static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC;}
- 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 void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
- static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; }
- static inline pte_t pte_rdprotect(pte_t pte) {
- pte_val(pte) &= ~_PAGE_USER; return pte; }
- static inline pte_t pte_exprotect(pte_t pte) {
- pte_val(pte) &= ~_PAGE_EXEC; return pte; }
- static inline pte_t pte_wrprotect(pte_t pte) {
- pte_val(pte) &= ~(_PAGE_RW); return pte; }
- static inline pte_t pte_mkclean(pte_t pte) {
- pte_val(pte) &= ~(_PAGE_DIRTY); return pte; }
- static inline pte_t pte_mkold(pte_t pte) {
- pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
- static inline pte_t pte_mkread(pte_t pte) {
- pte_val(pte) |= _PAGE_USER; return pte; }
- static inline pte_t pte_mkexec(pte_t pte) {
- pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
- static inline pte_t pte_mkwrite(pte_t pte) {
- pte_val(pte) |= _PAGE_RW; return pte; }
- static inline pte_t pte_mkdirty(pte_t pte) {
- pte_val(pte) |= _PAGE_DIRTY; return pte; }
- static inline pte_t pte_mkyoung(pte_t pte) {
- pte_val(pte) |= _PAGE_ACCESSED; return pte; }
- /* Atomic PTE updates */
- static inline unsigned long pte_update( pte_t *p, unsigned long clr,
- unsigned long set )
- {
- unsigned long old, tmp;
- __asm__ __volatile__("n
- 1: ldarx %0,0,%3 n
- andc %1,%0,%4 n
- or %1,%1,%5 n
- stdcx. %1,0,%3 n
- bne- 1b"
- : "=&r" (old), "=&r" (tmp), "=m" (*p)
- : "r" (p), "r" (clr), "r" (set), "m" (*p)
- : "cc" );
- return old;
- }
- static inline int ptep_test_and_clear_young(pte_t *ptep)
- {
- return (pte_update(ptep, _PAGE_ACCESSED, 0) & _PAGE_ACCESSED) != 0;
- }
- static inline int ptep_test_and_clear_dirty(pte_t *ptep)
- {
- return (pte_update(ptep, _PAGE_DIRTY, 0) & _PAGE_DIRTY) != 0;
- }
- static inline pte_t ptep_get_and_clear(pte_t *ptep)
- {
- return __pte(pte_update(ptep, ~_PAGE_HPTEFLAGS, 0));
- }
- static inline void ptep_set_wrprotect(pte_t *ptep)
- {
- pte_update(ptep, _PAGE_RW, 0);
- }
- static inline void ptep_mkdirty(pte_t *ptep)
- {
- pte_update(ptep, 0, _PAGE_DIRTY);
- }
- #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
- /*
- * set_pte stores a linux PTE into the linux page table.
- * On machines which use an MMU hash table we avoid changing the
- * _PAGE_HASHPTE bit.
- */
- static inline void set_pte(pte_t *ptep, pte_t pte)
- {
- pte_update(ptep, ~_PAGE_HPTEFLAGS, pte_val(pte) & ~_PAGE_HPTEFLAGS);
- }
- static inline void pte_clear(pte_t * ptep)
- {
- pte_update(ptep, ~_PAGE_HPTEFLAGS, 0);
- }
- struct mm_struct;
- struct vm_area_struct;
- extern void local_flush_tlb_all(void);
- extern void local_flush_tlb_mm(struct mm_struct *mm);
- extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
- extern void local_flush_tlb_range(struct mm_struct *mm, unsigned long start,
- unsigned long end);
- #define flush_tlb_all local_flush_tlb_all
- #define flush_tlb_mm local_flush_tlb_mm
- #define flush_tlb_page local_flush_tlb_page
- #define flush_tlb_range local_flush_tlb_range
- static inline void flush_tlb_pgtables(struct mm_struct *mm,
- unsigned long start, unsigned long end)
- {
- /* PPC has hw page tables. */
- }
- /*
- * No cache flushing is required when address mappings are
- * changed, because the caches on PowerPCs are physically
- * addressed.
- */
- #define flush_cache_all() do { } while (0)
- #define flush_cache_mm(mm) do { } while (0)
- #define flush_cache_range(mm, a, b) do { } while (0)
- #define flush_cache_page(vma, p) do { } while (0)
- #define flush_page_to_ram(page) do { } while (0)
- extern void flush_icache_user_range(struct vm_area_struct *vma,
- struct page *page, unsigned long addr, int len);
- extern void flush_icache_range(unsigned long, unsigned long);
- extern void __flush_dcache_icache(void *page_va);
- extern void flush_dcache_page(struct page *page);
- extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
- extern unsigned long va_to_phys(unsigned long address);
- extern pte_t *va_to_pte(unsigned long address);
- extern unsigned long ioremap_bot, ioremap_base;
- #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
- #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
- #define pte_ERROR(e)
- printk("%s:%d: bad pte %016lx.n", __FILE__, __LINE__, pte_val(e))
- #define pmd_ERROR(e)
- printk("%s:%d: bad pmd %08x.n", __FILE__, __LINE__, pmd_val(e))
- #define pgd_ERROR(e)
- printk("%s:%d: bad pgd %08x.n", __FILE__, __LINE__, pgd_val(e))
- extern pgd_t swapper_pg_dir[1024];
- extern pgd_t ioremap_dir[1024];
- extern void paging_init(void);
- /*
- * Page tables may have changed. We don't need to do anything here
- * as entries are faulted into the hash table by the low-level
- * data/instruction access exception handlers.
- */
- /*
- * We won't be able to use update_mmu_cache to update the
- * hardware page table because we need to update the pte
- * as well, but we don't get the address of the pte, only
- * its value.
- */
- #define update_mmu_cache(vma, addr, pte) do { } while (0)
- extern void flush_hash_segments(unsigned low_vsid, unsigned high_vsid);
- extern void flush_hash_page(unsigned long context, unsigned long ea, pte_t *ptep);
- extern void build_valid_hpte(unsigned long vsid, unsigned long ea,
- unsigned long pa, pte_t * ptep,
- unsigned hpteflags, unsigned bolted );
- /* Encode and de-code a swap entry */
- #define SWP_TYPE(entry) (((entry).val >> 1) & 0x3f)
- #define SWP_OFFSET(entry) ((entry).val >> 8)
- #define SWP_ENTRY(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
- #define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> PTE_SHIFT })
- #define swp_entry_to_pte(x) ((pte_t) { (x).val << PTE_SHIFT })
- /*
- * kern_addr_valid is intended to indicate whether an address is a valid
- * kernel address. Most 32-bit archs define it as always true (like this)
- * but most 64-bit archs actually perform a test. What should we do here?
- * The only use is in fs/ncpfs/dir.c
- */
- #define kern_addr_valid(addr) (1)
- #define io_remap_page_range remap_page_range
- /*
- * No page table caches to initialise
- */
- #define pgtable_cache_init() do { } while (0)
- extern void updateBoltedHptePP(unsigned long newpp, unsigned long ea);
- extern void hpte_init_pSeries(void);
- extern void hpte_init_iSeries(void);
- extern void make_pte(HPTE * htab, unsigned long va, unsigned long pa,
- int mode, unsigned long hash_mask, int large);
- #endif /* __ASSEMBLY__ */
- #endif /* _PPC64_PGTABLE_H */