pgtable.h
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- /* $Id: pgtable.h,v 1.154 2001/12/05 06:05:36 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/spitfire.h>
- #include <asm/asi.h>
- #include <asm/mmu_context.h>
- #include <asm/system.h>
- #include <asm/page.h>
- #include <asm/processor.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 0x0000000001000000
- #define MODULES_VADDR 0x0000000002000000
- #define MODULES_LEN 0x000000007e000000
- #define MODULES_END 0x0000000080000000
- #define VMALLOC_START 0x0000000140000000
- #define VMALLOC_VMADDR(x) ((unsigned long)(x))
- #define VMALLOC_END 0x0000000200000000
- #define LOW_OBP_ADDRESS 0x00000000f0000000
- #define HI_OBP_ADDRESS 0x0000000100000000
- /* 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 11
- /* 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))
- #ifndef __ASSEMBLY__
- /* Certain architectures need to do special things when pte's
- * within a page table are directly modified. Thus, the following
- * hook is made available.
- */
- #define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
- /* Entries per page directory level. */
- #define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3))
- /* We the first one in this file, what we export to the kernel
- * is different so we can optimize correctly for 32-bit tasks.
- */
- #define REAL_PTRS_PER_PMD (1UL << PMD_BITS)
- #define PTRS_PER_PMD ((const int)((current->thread.flags & SPARC_FLAG_32BIT) ?
- (1UL << (32 - (PAGE_SHIFT-3) - PAGE_SHIFT)) : (REAL_PTRS_PER_PMD)))
- /*
- * We cannot use the top address range because VPTE table lives there. This
- * formula finds the total legal virtual space in the processor, subtracts the
- * vpte size, then aligns it to the number of bytes mapped by one pgde, and
- * thus calculates the number of pgdes needed.
- */
- #define PTRS_PER_PGD (((1UL << VA_BITS) - VPTE_SIZE + (1UL << (PAGE_SHIFT +
- (PAGE_SHIFT-3) + PMD_BITS)) - 1) / (1UL << (PAGE_SHIFT +
- (PAGE_SHIFT-3) + PMD_BITS)))
- /* Kernel has a separate 44bit address space. */
- #define USER_PTRS_PER_PGD ((const int)((current->thread.flags & SPARC_FLAG_32BIT) ?
- (1) : (PTRS_PER_PGD)))
- #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 0x8000000000000000 /* Valid TTE */
- #define _PAGE_R 0x8000000000000000 /* Used to keep ref bit up to date */
- #define _PAGE_SZ4MB 0x6000000000000000 /* 4MB Page */
- #define _PAGE_SZ512K 0x4000000000000000 /* 512K Page */
- #define _PAGE_SZ64K 0x2000000000000000 /* 64K Page */
- #define _PAGE_SZ8K 0x0000000000000000 /* 8K Page */
- #define _PAGE_NFO 0x1000000000000000 /* No Fault Only */
- #define _PAGE_IE 0x0800000000000000 /* Invert Endianness */
- #define _PAGE_SN 0x0000800000000000 /* (Cheetah) Snoop */
- #define _PAGE_PADDR_SF 0x000001FFFFFFE000 /* (Spitfire) Phys Address [40:13] */
- #define _PAGE_PADDR 0x000007FFFFFFE000 /* (Cheetah) Phys Address [42:13] */
- #define _PAGE_SOFT 0x0000000000001F80 /* Software bits */
- #define _PAGE_L 0x0000000000000040 /* Locked TTE */
- #define _PAGE_CP 0x0000000000000020 /* Cacheable in Physical Cache */
- #define _PAGE_CV 0x0000000000000010 /* Cacheable in Virtual Cache */
- #define _PAGE_E 0x0000000000000008 /* side-Effect */
- #define _PAGE_P 0x0000000000000004 /* Privileged Page */
- #define _PAGE_W 0x0000000000000002 /* Writable */
- #define _PAGE_G 0x0000000000000001 /* Global */
- /* Here are the SpitFire software bits we use in the TTE's. */
- #define _PAGE_MODIFIED 0x0000000000000800 /* Modified Page (ie. dirty) */
- #define _PAGE_ACCESSED 0x0000000000000400 /* Accessed Page (ie. referenced) */
- #define _PAGE_READ 0x0000000000000200 /* Readable SW Bit */
- #define _PAGE_WRITE 0x0000000000000100 /* Writable SW Bit */
- #define _PAGE_PRESENT 0x0000000000000080 /* Present Page (ie. not swapped out) */
- #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_SZ4M
- #else
- #error Wrong PAGE_SHIFT specified
- #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)
- /* 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)
- #define PAGE_COPY __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE |
- __ACCESS_BITS)
- #define PAGE_READONLY __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE |
- __ACCESS_BITS)
- #define PAGE_KERNEL __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE |
- __PRIV_BITS | __ACCESS_BITS | __DIRTY_BITS)
- #define PAGE_INVALID __pgprot (0)
- #define _PFN_MASK _PAGE_PADDR
- #define _PAGE_CHG_MASK (_PFN_MASK | _PAGE_MODIFIED | _PAGE_ACCESSED | _PAGE_PRESENT | _PAGE_SZBITS)
- #define pg_iobits (_PAGE_VALID | _PAGE_PRESENT | __DIRTY_BITS | __ACCESS_BITS | _PAGE_E)
- #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
- #ifndef __ASSEMBLY__
- extern unsigned long phys_base;
- extern struct page *mem_map_zero;
- #define ZERO_PAGE(vaddr) (mem_map_zero)
- /* Warning: These take pointers to page structs now... */
- #define mk_pte(page, pgprot)
- __pte((((page - mem_map) << PAGE_SHIFT)+phys_base) | pgprot_val(pgprot) | _PAGE_SZBITS)
- #define page_pte_prot(page, prot) mk_pte(page, prot)
- #define page_pte(page) page_pte_prot(page, __pgprot(0))
- #define mk_pte_phys(physpage, pgprot) (__pte((physpage) | pgprot_val(pgprot) | _PAGE_SZBITS))
- extern inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
- {
- pte_t __pte;
- pte_val(__pte) = (pte_val(orig_pte) & _PAGE_CHG_MASK) |
- pgprot_val(new_prot);
- return __pte;
- }
- #define pmd_set(pmdp, ptep)
- (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL))
- #define pgd_set(pgdp, pmdp)
- (pgd_val(*(pgdp)) = (__pa((unsigned long) (pmdp)) >> 11UL))
- #define pmd_page(pmd) ((unsigned long) __va((pmd_val(pmd)<<11UL)))
- #define pgd_page(pgd) ((unsigned long) __va((pgd_val(pgd)<<11UL)))
- #define pte_none(pte) (!pte_val(pte))
- #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
- #define pte_clear(pte) (pte_val(*(pte)) = 0UL)
- #define pmd_none(pmd) (!pmd_val(pmd))
- #define pmd_bad(pmd) (0)
- #define pmd_present(pmd) (pmd_val(pmd) != 0UL)
- #define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0UL)
- #define pgd_none(pgd) (!pgd_val(pgd))
- #define pgd_bad(pgd) (0)
- #define pgd_present(pgd) (pgd_val(pgd) != 0UL)
- #define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL)
- /* 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_read(pte)
- #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)
- #define pte_page(x) (mem_map+(((pte_val(x)&_PAGE_PADDR)-phys_base)>>PAGE_SHIFT))
- /* 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))
- #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 second-level page table.. */
- #define pmd_offset(dir, address) ((pmd_t *) pgd_page(*(dir)) +
- ((address >> PMD_SHIFT) & (REAL_PTRS_PER_PMD-1)))
- /* Find an entry in the third-level page table.. */
- #define pte_offset(dir, address) ((pte_t *) pmd_page(*(dir)) +
- ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
- 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)
- extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
- #define flush_icache_page(vma, pg) do { } while(0)
- #define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
- /* Make a non-present pseudo-TTE. */
- extern 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 })
- extern unsigned long prom_virt_to_phys(unsigned long, int *);
- extern __inline__ unsigned long
- sun4u_get_pte (unsigned long addr)
- {
- pgd_t *pgdp;
- 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, 0);
- pgdp = pgd_offset_k (addr);
- pmdp = pmd_offset (pgdp, addr);
- ptep = pte_offset (pmdp, addr);
- return pte_val (*ptep) & _PAGE_PADDR;
- }
- extern __inline__ unsigned long
- __get_phys (unsigned long addr)
- {
- return sun4u_get_pte (addr);
- }
- extern __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(unsigned long from, unsigned long offset,
- unsigned long size, pgprot_t prot, int space);
- #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
- #endif /* !(__ASSEMBLY__) */
- /*
- * No page table caches to initialise
- */
- #define pgtable_cache_init() do { } while (0)
- #endif /* !(_SPARC64_PGTABLE_H) */