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Diffstat (limited to 'include/asm-sparc64/pgtable.h')
| -rw-r--r-- | include/asm-sparc64/pgtable.h | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h new file mode 100644 index 0000000..ca04ac1 --- /dev/null +++ b/include/asm-sparc64/pgtable.h @@ -0,0 +1,464 @@ +/* $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 --> 16MB). + * The page copy blockops use 0x1000000 to 0x18000000 (16MB --> 24MB). + * The PROM resides in an area spanning 0xf0000000 to 0x100000000. + * The vmalloc area spans 0x140000000 to 0x200000000. + * There is a single static kernel PMD which maps from 0x0 to address + * 0x400000000. + */ +#define TLBTEMP_BASE _AC(0x0000000001000000,UL) +#define MODULES_VADDR _AC(0x0000000002000000,UL) +#define MODULES_LEN _AC(0x000000007e000000,UL) +#define MODULES_END _AC(0x0000000080000000,UL) +#define VMALLOC_START _AC(0x0000000140000000,UL) +#define VMALLOC_END _AC(0x0000000200000000,UL) +#define LOW_OBP_ADDRESS _AC(0x00000000f0000000,UL) +#define HI_OBP_ADDRESS _AC(0x0000000100000000,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_PGD_NR 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)) + +/* 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_page_range(struct vm_area_struct *vma, unsigned long from, + unsigned long offset, + unsigned long size, pgprot_t prot, int space); +extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, + unsigned long pfn, + unsigned long size, pgprot_t prot); + +/* + * 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) + +/* Override for {pgd,pmd}_addr_end() to deal with the virtual address + * space hole. We simply sign extend bit 43. + */ +#define pgd_addr_end(addr, end) \ +({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ + __boundary = ((long) (__boundary << 20)) >> 20; \ + (__boundary - 1 < (end) - 1)? __boundary: (end); \ +}) + +#define pmd_addr_end(addr, end) \ +({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ + __boundary = ((long) (__boundary << 20)) >> 20; \ + (__boundary - 1 < (end) - 1)? __boundary: (end); \ +}) + +#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) */ |