| /* $Id: pgtable.h,v 1.156 2002/02/09 19:49:31 davem Exp $ |
| * pgtable.h: SpitFire page table operations. |
| * |
| * Copyright 1996,1997 David S. Miller (davem@caip.rutgers.edu) |
| * Copyright 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| */ |
| |
| #ifndef _SPARC64_PGTABLE_H |
| #define _SPARC64_PGTABLE_H |
| |
| /* This file contains the functions and defines necessary to modify and use |
| * the SpitFire page tables. |
| */ |
| |
| #include <asm-generic/pgtable-nopud.h> |
| |
| #include <linux/config.h> |
| #include <linux/compiler.h> |
| #include <asm/types.h> |
| #include <asm/spitfire.h> |
| #include <asm/asi.h> |
| #include <asm/system.h> |
| #include <asm/page.h> |
| #include <asm/processor.h> |
| #include <asm/const.h> |
| |
| /* The kernel image occupies 0x4000000 to 0x1000000 (4MB --> 32MB). |
| * The page copy blockops can use 0x2000000 to 0x10000000. |
| * The PROM resides in an area spanning 0xf0000000 to 0x100000000. |
| * The vmalloc area spans 0x100000000 to 0x200000000. |
| * Since modules need to be in the lowest 32-bits of the address space, |
| * we place them right before the OBP area from 0x10000000 to 0xf0000000. |
| * There is a single static kernel PMD which maps from 0x0 to address |
| * 0x400000000. |
| */ |
| #define TLBTEMP_BASE _AC(0x0000000002000000,UL) |
| #define MODULES_VADDR _AC(0x0000000010000000,UL) |
| #define MODULES_LEN _AC(0x00000000e0000000,UL) |
| #define MODULES_END _AC(0x00000000f0000000,UL) |
| #define LOW_OBP_ADDRESS _AC(0x00000000f0000000,UL) |
| #define HI_OBP_ADDRESS _AC(0x0000000100000000,UL) |
| #define VMALLOC_START _AC(0x0000000100000000,UL) |
| #define VMALLOC_END _AC(0x0000000200000000,UL) |
| |
| /* XXX All of this needs to be rethought so we can take advantage |
| * XXX cheetah's full 64-bit virtual address space, ie. no more hole |
| * XXX in the middle like on spitfire. -DaveM |
| */ |
| /* |
| * Given a virtual address, the lowest PAGE_SHIFT bits determine offset |
| * into the page; the next higher PAGE_SHIFT-3 bits determine the pte# |
| * in the proper pagetable (the -3 is from the 8 byte ptes, and each page |
| * table is a single page long). The next higher PMD_BITS determine pmd# |
| * in the proper pmdtable (where we must have PMD_BITS <= (PAGE_SHIFT-2) |
| * since the pmd entries are 4 bytes, and each pmd page is a single page |
| * long). Finally, the higher few bits determine pgde#. |
| */ |
| |
| /* PMD_SHIFT determines the size of the area a second-level page |
| * table can map |
| */ |
| #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3)) |
| #define PMD_SIZE (1UL << PMD_SHIFT) |
| #define PMD_MASK (~(PMD_SIZE-1)) |
| #define PMD_BITS (PAGE_SHIFT - 2) |
| |
| /* PGDIR_SHIFT determines what a third-level page table entry can map */ |
| #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS) |
| #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| #define PGDIR_BITS (PAGE_SHIFT - 2) |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <linux/sched.h> |
| |
| /* Entries per page directory level. */ |
| #define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3)) |
| #define PTRS_PER_PMD (1UL << PMD_BITS) |
| #define PTRS_PER_PGD (1UL << PGDIR_BITS) |
| |
| /* Kernel has a separate 44bit address space. */ |
| #define FIRST_USER_ADDRESS 0 |
| |
| #define pte_ERROR(e) __builtin_trap() |
| #define pmd_ERROR(e) __builtin_trap() |
| #define pgd_ERROR(e) __builtin_trap() |
| |
| #endif /* !(__ASSEMBLY__) */ |
| |
| /* Spitfire/Cheetah TTE bits. */ |
| #define _PAGE_VALID _AC(0x8000000000000000,UL) /* Valid TTE */ |
| #define _PAGE_R _AC(0x8000000000000000,UL) /* Keep ref bit up to date*/ |
| #define _PAGE_SZ4MB _AC(0x6000000000000000,UL) /* 4MB Page */ |
| #define _PAGE_SZ512K _AC(0x4000000000000000,UL) /* 512K Page */ |
| #define _PAGE_SZ64K _AC(0x2000000000000000,UL) /* 64K Page */ |
| #define _PAGE_SZ8K _AC(0x0000000000000000,UL) /* 8K Page */ |
| #define _PAGE_NFO _AC(0x1000000000000000,UL) /* No Fault Only */ |
| #define _PAGE_IE _AC(0x0800000000000000,UL) /* Invert Endianness */ |
| #define _PAGE_SOFT2 _AC(0x07FC000000000000,UL) /* Software bits, set 2 */ |
| #define _PAGE_RES1 _AC(0x0003000000000000,UL) /* Reserved */ |
| #define _PAGE_SN _AC(0x0000800000000000,UL) /* (Cheetah) Snoop */ |
| #define _PAGE_RES2 _AC(0x0000780000000000,UL) /* Reserved */ |
| #define _PAGE_PADDR_SF _AC(0x000001FFFFFFE000,UL) /* (Spitfire) paddr[40:13]*/ |
| #define _PAGE_PADDR _AC(0x000007FFFFFFE000,UL) /* (Cheetah) paddr[42:13] */ |
| #define _PAGE_SOFT _AC(0x0000000000001F80,UL) /* Software bits */ |
| #define _PAGE_L _AC(0x0000000000000040,UL) /* Locked TTE */ |
| #define _PAGE_CP _AC(0x0000000000000020,UL) /* Cacheable in P-Cache */ |
| #define _PAGE_CV _AC(0x0000000000000010,UL) /* Cacheable in V-Cache */ |
| #define _PAGE_E _AC(0x0000000000000008,UL) /* side-Effect */ |
| #define _PAGE_P _AC(0x0000000000000004,UL) /* Privileged Page */ |
| #define _PAGE_W _AC(0x0000000000000002,UL) /* Writable */ |
| #define _PAGE_G _AC(0x0000000000000001,UL) /* Global */ |
| |
| /* Here are the SpitFire software bits we use in the TTE's. |
| * |
| * WARNING: If you are going to try and start using some |
| * of the soft2 bits, you will need to make |
| * modifications to the swap entry implementation. |
| * For example, one thing that could happen is that |
| * swp_entry_to_pte() would BUG_ON() if you tried |
| * to use one of the soft2 bits for _PAGE_FILE. |
| * |
| * Like other architectures, I have aliased _PAGE_FILE with |
| * _PAGE_MODIFIED. This works because _PAGE_FILE is never |
| * interpreted that way unless _PAGE_PRESENT is clear. |
| */ |
| #define _PAGE_EXEC _AC(0x0000000000001000,UL) /* Executable SW bit */ |
| #define _PAGE_MODIFIED _AC(0x0000000000000800,UL) /* Modified (dirty) */ |
| #define _PAGE_FILE _AC(0x0000000000000800,UL) /* Pagecache page */ |
| #define _PAGE_ACCESSED _AC(0x0000000000000400,UL) /* Accessed (ref'd) */ |
| #define _PAGE_READ _AC(0x0000000000000200,UL) /* Readable SW Bit */ |
| #define _PAGE_WRITE _AC(0x0000000000000100,UL) /* Writable SW Bit */ |
| #define _PAGE_PRESENT _AC(0x0000000000000080,UL) /* Present */ |
| |
| #if PAGE_SHIFT == 13 |
| #define _PAGE_SZBITS _PAGE_SZ8K |
| #elif PAGE_SHIFT == 16 |
| #define _PAGE_SZBITS _PAGE_SZ64K |
| #elif PAGE_SHIFT == 19 |
| #define _PAGE_SZBITS _PAGE_SZ512K |
| #elif PAGE_SHIFT == 22 |
| #define _PAGE_SZBITS _PAGE_SZ4MB |
| #else |
| #error Wrong PAGE_SHIFT specified |
| #endif |
| |
| #if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) |
| #define _PAGE_SZHUGE _PAGE_SZ4MB |
| #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K) |
| #define _PAGE_SZHUGE _PAGE_SZ512K |
| #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K) |
| #define _PAGE_SZHUGE _PAGE_SZ64K |
| #endif |
| |
| #define _PAGE_CACHE (_PAGE_CP | _PAGE_CV) |
| |
| #define __DIRTY_BITS (_PAGE_MODIFIED | _PAGE_WRITE | _PAGE_W) |
| #define __ACCESS_BITS (_PAGE_ACCESSED | _PAGE_READ | _PAGE_R) |
| #define __PRIV_BITS _PAGE_P |
| |
| #define PAGE_NONE __pgprot (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_CACHE) |
| |
| /* Don't set the TTE _PAGE_W bit here, else the dirty bit never gets set. */ |
| #define PAGE_SHARED __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \ |
| __ACCESS_BITS | _PAGE_WRITE | _PAGE_EXEC) |
| |
| #define PAGE_COPY __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \ |
| __ACCESS_BITS | _PAGE_EXEC) |
| |
| #define PAGE_READONLY __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \ |
| __ACCESS_BITS | _PAGE_EXEC) |
| |
| #define PAGE_KERNEL __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \ |
| __PRIV_BITS | \ |
| __ACCESS_BITS | __DIRTY_BITS | _PAGE_EXEC) |
| |
| #define PAGE_SHARED_NOEXEC __pgprot (_PAGE_PRESENT | _PAGE_VALID | \ |
| _PAGE_CACHE | \ |
| __ACCESS_BITS | _PAGE_WRITE) |
| |
| #define PAGE_COPY_NOEXEC __pgprot (_PAGE_PRESENT | _PAGE_VALID | \ |
| _PAGE_CACHE | __ACCESS_BITS) |
| |
| #define PAGE_READONLY_NOEXEC __pgprot (_PAGE_PRESENT | _PAGE_VALID | \ |
| _PAGE_CACHE | __ACCESS_BITS) |
| |
| #define _PFN_MASK _PAGE_PADDR |
| |
| #define pg_iobits (_PAGE_VALID | _PAGE_PRESENT | __DIRTY_BITS | \ |
| __ACCESS_BITS | _PAGE_E) |
| |
| #define __P000 PAGE_NONE |
| #define __P001 PAGE_READONLY_NOEXEC |
| #define __P010 PAGE_COPY_NOEXEC |
| #define __P011 PAGE_COPY_NOEXEC |
| #define __P100 PAGE_READONLY |
| #define __P101 PAGE_READONLY |
| #define __P110 PAGE_COPY |
| #define __P111 PAGE_COPY |
| |
| #define __S000 PAGE_NONE |
| #define __S001 PAGE_READONLY_NOEXEC |
| #define __S010 PAGE_SHARED_NOEXEC |
| #define __S011 PAGE_SHARED_NOEXEC |
| #define __S100 PAGE_READONLY |
| #define __S101 PAGE_READONLY |
| #define __S110 PAGE_SHARED |
| #define __S111 PAGE_SHARED |
| |
| #ifndef __ASSEMBLY__ |
| |
| extern unsigned long phys_base; |
| extern unsigned long pfn_base; |
| |
| extern struct page *mem_map_zero; |
| #define ZERO_PAGE(vaddr) (mem_map_zero) |
| |
| /* PFNs are real physical page numbers. However, mem_map only begins to record |
| * per-page information starting at pfn_base. This is to handle systems where |
| * the first physical page in the machine is at some huge physical address, |
| * such as 4GB. This is common on a partitioned E10000, for example. |
| */ |
| |
| #define pfn_pte(pfn, prot) \ |
| __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot) | _PAGE_SZBITS) |
| #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) |
| |
| #define pte_pfn(x) ((pte_val(x) & _PAGE_PADDR)>>PAGE_SHIFT) |
| #define pte_page(x) pfn_to_page(pte_pfn(x)) |
| |
| #define page_pte_prot(page, prot) mk_pte(page, prot) |
| #define page_pte(page) page_pte_prot(page, __pgprot(0)) |
| |
| static inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot) |
| { |
| pte_t __pte; |
| const unsigned long preserve_mask = (_PFN_MASK | |
| _PAGE_MODIFIED | _PAGE_ACCESSED | |
| _PAGE_CACHE | _PAGE_E | |
| _PAGE_PRESENT | _PAGE_SZBITS); |
| |
| pte_val(__pte) = (pte_val(orig_pte) & preserve_mask) | |
| (pgprot_val(new_prot) & ~preserve_mask); |
| |
| return __pte; |
| } |
| #define pmd_set(pmdp, ptep) \ |
| (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL)) |
| #define pud_set(pudp, pmdp) \ |
| (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> 11UL)) |
| #define __pmd_page(pmd) \ |
| ((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL))) |
| #define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd)) |
| #define pud_page(pud) \ |
| ((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL))) |
| #define pte_none(pte) (!pte_val(pte)) |
| #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) |
| #define pmd_none(pmd) (!pmd_val(pmd)) |
| #define pmd_bad(pmd) (0) |
| #define pmd_present(pmd) (pmd_val(pmd) != 0U) |
| #define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0U) |
| #define pud_none(pud) (!pud_val(pud)) |
| #define pud_bad(pud) (0) |
| #define pud_present(pud) (pud_val(pud) != 0U) |
| #define pud_clear(pudp) (pud_val(*(pudp)) = 0U) |
| |
| /* The following only work if pte_present() is true. |
| * Undefined behaviour if not.. |
| */ |
| #define pte_read(pte) (pte_val(pte) & _PAGE_READ) |
| #define pte_exec(pte) (pte_val(pte) & _PAGE_EXEC) |
| #define pte_write(pte) (pte_val(pte) & _PAGE_WRITE) |
| #define pte_dirty(pte) (pte_val(pte) & _PAGE_MODIFIED) |
| #define pte_young(pte) (pte_val(pte) & _PAGE_ACCESSED) |
| #define pte_wrprotect(pte) (__pte(pte_val(pte) & ~(_PAGE_WRITE|_PAGE_W))) |
| #define pte_rdprotect(pte) \ |
| (__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_READ)) |
| #define pte_mkclean(pte) \ |
| (__pte(pte_val(pte) & ~(_PAGE_MODIFIED|_PAGE_W))) |
| #define pte_mkold(pte) \ |
| (__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_ACCESSED)) |
| |
| /* Permanent address of a page. */ |
| #define __page_address(page) page_address(page) |
| |
| /* Be very careful when you change these three, they are delicate. */ |
| #define pte_mkyoung(pte) (__pte(pte_val(pte) | _PAGE_ACCESSED | _PAGE_R)) |
| #define pte_mkwrite(pte) (__pte(pte_val(pte) | _PAGE_WRITE)) |
| #define pte_mkdirty(pte) (__pte(pte_val(pte) | _PAGE_MODIFIED | _PAGE_W)) |
| #define pte_mkhuge(pte) (__pte(pte_val(pte) | _PAGE_SZHUGE)) |
| |
| /* 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) |
| |
| /* extract the pgd cache used for optimizing the tlb miss |
| * slow path when executing 32-bit compat processes |
| */ |
| #define get_pgd_cache(pgd) ((unsigned long) pgd_val(*pgd) << 11) |
| |
| /* Find an entry in the second-level page table.. */ |
| #define pmd_offset(pudp, address) \ |
| ((pmd_t *) pud_page(*(pudp)) + \ |
| (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))) |
| |
| /* Find an entry in the third-level page table.. */ |
| #define pte_index(dir, address) \ |
| ((pte_t *) __pmd_page(*(dir)) + \ |
| ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) |
| #define pte_offset_kernel pte_index |
| #define pte_offset_map pte_index |
| #define pte_offset_map_nested pte_index |
| #define pte_unmap(pte) do { } while (0) |
| #define pte_unmap_nested(pte) do { } while (0) |
| |
| /* Actual page table PTE updates. */ |
| extern void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig); |
| |
| static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) |
| { |
| pte_t orig = *ptep; |
| |
| *ptep = pte; |
| |
| /* It is more efficient to let flush_tlb_kernel_range() |
| * handle init_mm tlb flushes. |
| */ |
| if (likely(mm != &init_mm) && (pte_val(orig) & _PAGE_VALID)) |
| tlb_batch_add(mm, addr, ptep, orig); |
| } |
| |
| #define pte_clear(mm,addr,ptep) \ |
| set_pte_at((mm), (addr), (ptep), __pte(0UL)) |
| |
| extern pgd_t swapper_pg_dir[1]; |
| |
| /* These do nothing with the way I have things setup. */ |
| #define mmu_lockarea(vaddr, len) (vaddr) |
| #define mmu_unlockarea(vaddr, len) do { } while(0) |
| |
| struct vm_area_struct; |
| extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t); |
| |
| /* Make a non-present pseudo-TTE. */ |
| static inline pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space) |
| { |
| pte_t pte; |
| pte_val(pte) = (((page) | pgprot_val(prot) | _PAGE_E) & |
| ~(unsigned long)_PAGE_CACHE); |
| pte_val(pte) |= (((unsigned long)space) << 32); |
| return pte; |
| } |
| |
| /* Encode and de-code a swap entry */ |
| #define __swp_type(entry) (((entry).val >> PAGE_SHIFT) & 0xffUL) |
| #define __swp_offset(entry) ((entry).val >> (PAGE_SHIFT + 8UL)) |
| #define __swp_entry(type, offset) \ |
| ( (swp_entry_t) \ |
| { \ |
| (((long)(type) << PAGE_SHIFT) | \ |
| ((long)(offset) << (PAGE_SHIFT + 8UL))) \ |
| } ) |
| #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 support. */ |
| #define pte_file(pte) (pte_val(pte) & _PAGE_FILE) |
| #define pte_to_pgoff(pte) (pte_val(pte) >> PAGE_SHIFT) |
| #define pgoff_to_pte(off) (__pte(((off) << PAGE_SHIFT) | _PAGE_FILE)) |
| #define PTE_FILE_MAX_BITS (64UL - PAGE_SHIFT - 1UL) |
| |
| extern unsigned long prom_virt_to_phys(unsigned long, int *); |
| |
| static __inline__ unsigned long |
| sun4u_get_pte (unsigned long addr) |
| { |
| pgd_t *pgdp; |
| pud_t *pudp; |
| pmd_t *pmdp; |
| pte_t *ptep; |
| |
| if (addr >= PAGE_OFFSET) |
| return addr & _PAGE_PADDR; |
| if ((addr >= LOW_OBP_ADDRESS) && (addr < HI_OBP_ADDRESS)) |
| return prom_virt_to_phys(addr, NULL); |
| pgdp = pgd_offset_k(addr); |
| pudp = pud_offset(pgdp, addr); |
| pmdp = pmd_offset(pudp, addr); |
| ptep = pte_offset_kernel(pmdp, addr); |
| return pte_val(*ptep) & _PAGE_PADDR; |
| } |
| |
| static __inline__ unsigned long |
| __get_phys (unsigned long addr) |
| { |
| return sun4u_get_pte (addr); |
| } |
| |
| static __inline__ int |
| __get_iospace (unsigned long addr) |
| { |
| return ((sun4u_get_pte (addr) & 0xf0000000) >> 28); |
| } |
| |
| extern unsigned long *sparc64_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))>>22, sparc64_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); |
| |
| /* Clear virtual and physical cachability, set side-effect bit. */ |
| #define pgprot_noncached(prot) \ |
| (__pgprot((pgprot_val(prot) & ~(_PAGE_CP | _PAGE_CV)) | \ |
| _PAGE_E)) |
| |
| /* |
| * 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 & 0x0fffffffffffffffUL) |
| |
| #include <asm-generic/pgtable.h> |
| |
| /* We provide our own get_unmapped_area to cope with VA holes for userland */ |
| #define HAVE_ARCH_UNMAPPED_AREA |
| |
| /* We provide a special get_unmapped_area for framebuffer mmaps to try and use |
| * the largest alignment possible such that larget PTEs can be used. |
| */ |
| extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long, |
| unsigned long, unsigned long, |
| unsigned long); |
| #define HAVE_ARCH_FB_UNMAPPED_AREA |
| |
| /* |
| * No page table caches to initialise |
| */ |
| #define pgtable_cache_init() do { } while (0) |
| |
| extern void check_pgt_cache(void); |
| |
| #endif /* !(__ASSEMBLY__) */ |
| |
| #endif /* !(_SPARC64_PGTABLE_H) */ |