1deae26bfSKyle McMartin #ifndef _PARISC_PGTABLE_H 2deae26bfSKyle McMartin #define _PARISC_PGTABLE_H 3deae26bfSKyle McMartin 4deae26bfSKyle McMartin #include <asm-generic/4level-fixup.h> 5deae26bfSKyle McMartin 6deae26bfSKyle McMartin #include <asm/fixmap.h> 7deae26bfSKyle McMartin 8deae26bfSKyle McMartin #ifndef __ASSEMBLY__ 9deae26bfSKyle McMartin /* 10deae26bfSKyle McMartin * we simulate an x86-style page table for the linux mm code 11deae26bfSKyle McMartin */ 12deae26bfSKyle McMartin 13deae26bfSKyle McMartin #include <linux/mm.h> /* for vm_area_struct */ 14deae26bfSKyle McMartin #include <linux/bitops.h> 15deae26bfSKyle McMartin #include <asm/processor.h> 16deae26bfSKyle McMartin #include <asm/cache.h> 17deae26bfSKyle McMartin 18deae26bfSKyle McMartin /* 19deae26bfSKyle McMartin * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel 20deae26bfSKyle McMartin * memory. For the return value to be meaningful, ADDR must be >= 21deae26bfSKyle McMartin * PAGE_OFFSET. This operation can be relatively expensive (e.g., 22deae26bfSKyle McMartin * require a hash-, or multi-level tree-lookup or something of that 23deae26bfSKyle McMartin * sort) but it guarantees to return TRUE only if accessing the page 24deae26bfSKyle McMartin * at that address does not cause an error. Note that there may be 25deae26bfSKyle McMartin * addresses for which kern_addr_valid() returns FALSE even though an 26deae26bfSKyle McMartin * access would not cause an error (e.g., this is typically true for 27deae26bfSKyle McMartin * memory mapped I/O regions. 28deae26bfSKyle McMartin * 29deae26bfSKyle McMartin * XXX Need to implement this for parisc. 30deae26bfSKyle McMartin */ 31deae26bfSKyle McMartin #define kern_addr_valid(addr) (1) 32deae26bfSKyle McMartin 33deae26bfSKyle McMartin /* Certain architectures need to do special things when PTEs 34deae26bfSKyle McMartin * within a page table are directly modified. Thus, the following 35deae26bfSKyle McMartin * hook is made available. 36deae26bfSKyle McMartin */ 37deae26bfSKyle McMartin #define set_pte(pteptr, pteval) \ 38deae26bfSKyle McMartin do{ \ 39deae26bfSKyle McMartin *(pteptr) = (pteval); \ 40deae26bfSKyle McMartin } while(0) 41deae26bfSKyle McMartin #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 42deae26bfSKyle McMartin 43deae26bfSKyle McMartin #endif /* !__ASSEMBLY__ */ 44deae26bfSKyle McMartin 45deae26bfSKyle McMartin #define pte_ERROR(e) \ 46deae26bfSKyle McMartin printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 47deae26bfSKyle McMartin #define pmd_ERROR(e) \ 48deae26bfSKyle McMartin printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, (unsigned long)pmd_val(e)) 49deae26bfSKyle McMartin #define pgd_ERROR(e) \ 50deae26bfSKyle McMartin printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e)) 51deae26bfSKyle McMartin 52deae26bfSKyle McMartin /* This is the size of the initially mapped kernel memory */ 53deae26bfSKyle McMartin #define KERNEL_INITIAL_ORDER 24 /* 0 to 1<<24 = 16MB */ 54deae26bfSKyle McMartin #define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER) 55deae26bfSKyle McMartin 56deae26bfSKyle McMartin #if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB) 57deae26bfSKyle McMartin #define PT_NLEVELS 3 58deae26bfSKyle McMartin #define PGD_ORDER 1 /* Number of pages per pgd */ 59deae26bfSKyle McMartin #define PMD_ORDER 1 /* Number of pages per pmd */ 60deae26bfSKyle McMartin #define PGD_ALLOC_ORDER 2 /* first pgd contains pmd */ 61deae26bfSKyle McMartin #else 62deae26bfSKyle McMartin #define PT_NLEVELS 2 63deae26bfSKyle McMartin #define PGD_ORDER 1 /* Number of pages per pgd */ 64deae26bfSKyle McMartin #define PGD_ALLOC_ORDER PGD_ORDER 65deae26bfSKyle McMartin #endif 66deae26bfSKyle McMartin 67deae26bfSKyle McMartin /* Definitions for 3rd level (we use PLD here for Page Lower directory 68deae26bfSKyle McMartin * because PTE_SHIFT is used lower down to mean shift that has to be 69deae26bfSKyle McMartin * done to get usable bits out of the PTE) */ 70deae26bfSKyle McMartin #define PLD_SHIFT PAGE_SHIFT 71deae26bfSKyle McMartin #define PLD_SIZE PAGE_SIZE 72deae26bfSKyle McMartin #define BITS_PER_PTE (PAGE_SHIFT - BITS_PER_PTE_ENTRY) 73deae26bfSKyle McMartin #define PTRS_PER_PTE (1UL << BITS_PER_PTE) 74deae26bfSKyle McMartin 75deae26bfSKyle McMartin /* Definitions for 2nd level */ 76deae26bfSKyle McMartin #define pgtable_cache_init() do { } while (0) 77deae26bfSKyle McMartin 78deae26bfSKyle McMartin #define PMD_SHIFT (PLD_SHIFT + BITS_PER_PTE) 79deae26bfSKyle McMartin #define PMD_SIZE (1UL << PMD_SHIFT) 80deae26bfSKyle McMartin #define PMD_MASK (~(PMD_SIZE-1)) 81deae26bfSKyle McMartin #if PT_NLEVELS == 3 82deae26bfSKyle McMartin #define BITS_PER_PMD (PAGE_SHIFT + PMD_ORDER - BITS_PER_PMD_ENTRY) 83deae26bfSKyle McMartin #else 84deae26bfSKyle McMartin #define BITS_PER_PMD 0 85deae26bfSKyle McMartin #endif 86deae26bfSKyle McMartin #define PTRS_PER_PMD (1UL << BITS_PER_PMD) 87deae26bfSKyle McMartin 88deae26bfSKyle McMartin /* Definitions for 1st level */ 89deae26bfSKyle McMartin #define PGDIR_SHIFT (PMD_SHIFT + BITS_PER_PMD) 9048d27cb2SHelge Deller #if (PGDIR_SHIFT + PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) > BITS_PER_LONG 9148d27cb2SHelge Deller #define BITS_PER_PGD (BITS_PER_LONG - PGDIR_SHIFT) 9248d27cb2SHelge Deller #else 93deae26bfSKyle McMartin #define BITS_PER_PGD (PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) 9448d27cb2SHelge Deller #endif 95deae26bfSKyle McMartin #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 96deae26bfSKyle McMartin #define PGDIR_MASK (~(PGDIR_SIZE-1)) 97deae26bfSKyle McMartin #define PTRS_PER_PGD (1UL << BITS_PER_PGD) 98deae26bfSKyle McMartin #define USER_PTRS_PER_PGD PTRS_PER_PGD 99deae26bfSKyle McMartin 10048d27cb2SHelge Deller #ifdef CONFIG_64BIT 101deae26bfSKyle McMartin #define MAX_ADDRBITS (PGDIR_SHIFT + BITS_PER_PGD) 102deae26bfSKyle McMartin #define MAX_ADDRESS (1UL << MAX_ADDRBITS) 103deae26bfSKyle McMartin #define SPACEID_SHIFT (MAX_ADDRBITS - 32) 10448d27cb2SHelge Deller #else 10548d27cb2SHelge Deller #define MAX_ADDRBITS (BITS_PER_LONG) 10648d27cb2SHelge Deller #define MAX_ADDRESS (1UL << MAX_ADDRBITS) 10748d27cb2SHelge Deller #define SPACEID_SHIFT 0 10848d27cb2SHelge Deller #endif 109deae26bfSKyle McMartin 110deae26bfSKyle McMartin /* This calculates the number of initial pages we need for the initial 111deae26bfSKyle McMartin * page tables */ 112deae26bfSKyle McMartin #if (KERNEL_INITIAL_ORDER) >= (PMD_SHIFT) 113deae26bfSKyle McMartin # define PT_INITIAL (1 << (KERNEL_INITIAL_ORDER - PMD_SHIFT)) 114deae26bfSKyle McMartin #else 115deae26bfSKyle McMartin # define PT_INITIAL (1) /* all initial PTEs fit into one page */ 116deae26bfSKyle McMartin #endif 117deae26bfSKyle McMartin 118deae26bfSKyle McMartin /* 119deae26bfSKyle McMartin * pgd entries used up by user/kernel: 120deae26bfSKyle McMartin */ 121deae26bfSKyle McMartin 122deae26bfSKyle McMartin #define FIRST_USER_ADDRESS 0 123deae26bfSKyle McMartin 124deae26bfSKyle McMartin /* NB: The tlb miss handlers make certain assumptions about the order */ 125deae26bfSKyle McMartin /* of the following bits, so be careful (One example, bits 25-31 */ 126deae26bfSKyle McMartin /* are moved together in one instruction). */ 127deae26bfSKyle McMartin 128deae26bfSKyle McMartin #define _PAGE_READ_BIT 31 /* (0x001) read access allowed */ 129deae26bfSKyle McMartin #define _PAGE_WRITE_BIT 30 /* (0x002) write access allowed */ 130deae26bfSKyle McMartin #define _PAGE_EXEC_BIT 29 /* (0x004) execute access allowed */ 131deae26bfSKyle McMartin #define _PAGE_GATEWAY_BIT 28 /* (0x008) privilege promotion allowed */ 132deae26bfSKyle McMartin #define _PAGE_DMB_BIT 27 /* (0x010) Data Memory Break enable (B bit) */ 133deae26bfSKyle McMartin #define _PAGE_DIRTY_BIT 26 /* (0x020) Page Dirty (D bit) */ 134deae26bfSKyle McMartin #define _PAGE_FILE_BIT _PAGE_DIRTY_BIT /* overload this bit */ 135deae26bfSKyle McMartin #define _PAGE_REFTRAP_BIT 25 /* (0x040) Page Ref. Trap enable (T bit) */ 136deae26bfSKyle McMartin #define _PAGE_NO_CACHE_BIT 24 /* (0x080) Uncached Page (U bit) */ 137deae26bfSKyle McMartin #define _PAGE_ACCESSED_BIT 23 /* (0x100) Software: Page Accessed */ 138deae26bfSKyle McMartin #define _PAGE_PRESENT_BIT 22 /* (0x200) Software: translation valid */ 139deae26bfSKyle McMartin #define _PAGE_FLUSH_BIT 21 /* (0x400) Software: translation valid */ 140deae26bfSKyle McMartin /* for cache flushing only */ 141deae26bfSKyle McMartin #define _PAGE_USER_BIT 20 /* (0x800) Software: User accessible page */ 142deae26bfSKyle McMartin 143deae26bfSKyle McMartin /* N.B. The bits are defined in terms of a 32 bit word above, so the */ 144deae26bfSKyle McMartin /* following macro is ok for both 32 and 64 bit. */ 145deae26bfSKyle McMartin 146deae26bfSKyle McMartin #define xlate_pabit(x) (31 - x) 147deae26bfSKyle McMartin 148deae26bfSKyle McMartin /* this defines the shift to the usable bits in the PTE it is set so 149deae26bfSKyle McMartin * that the valid bits _PAGE_PRESENT_BIT and _PAGE_USER_BIT are set 150deae26bfSKyle McMartin * to zero */ 151deae26bfSKyle McMartin #define PTE_SHIFT xlate_pabit(_PAGE_USER_BIT) 152deae26bfSKyle McMartin 153deae26bfSKyle McMartin /* PFN_PTE_SHIFT defines the shift of a PTE value to access the PFN field */ 154deae26bfSKyle McMartin #define PFN_PTE_SHIFT 12 155deae26bfSKyle McMartin 156deae26bfSKyle McMartin 157deae26bfSKyle McMartin /* this is how many bits may be used by the file functions */ 158deae26bfSKyle McMartin #define PTE_FILE_MAX_BITS (BITS_PER_LONG - PTE_SHIFT) 159deae26bfSKyle McMartin 160deae26bfSKyle McMartin #define pte_to_pgoff(pte) (pte_val(pte) >> PTE_SHIFT) 161deae26bfSKyle McMartin #define pgoff_to_pte(off) ((pte_t) { ((off) << PTE_SHIFT) | _PAGE_FILE }) 162deae26bfSKyle McMartin 163deae26bfSKyle McMartin #define _PAGE_READ (1 << xlate_pabit(_PAGE_READ_BIT)) 164deae26bfSKyle McMartin #define _PAGE_WRITE (1 << xlate_pabit(_PAGE_WRITE_BIT)) 165deae26bfSKyle McMartin #define _PAGE_RW (_PAGE_READ | _PAGE_WRITE) 166deae26bfSKyle McMartin #define _PAGE_EXEC (1 << xlate_pabit(_PAGE_EXEC_BIT)) 167deae26bfSKyle McMartin #define _PAGE_GATEWAY (1 << xlate_pabit(_PAGE_GATEWAY_BIT)) 168deae26bfSKyle McMartin #define _PAGE_DMB (1 << xlate_pabit(_PAGE_DMB_BIT)) 169deae26bfSKyle McMartin #define _PAGE_DIRTY (1 << xlate_pabit(_PAGE_DIRTY_BIT)) 170deae26bfSKyle McMartin #define _PAGE_REFTRAP (1 << xlate_pabit(_PAGE_REFTRAP_BIT)) 171deae26bfSKyle McMartin #define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT)) 172deae26bfSKyle McMartin #define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT)) 173deae26bfSKyle McMartin #define _PAGE_PRESENT (1 << xlate_pabit(_PAGE_PRESENT_BIT)) 174deae26bfSKyle McMartin #define _PAGE_FLUSH (1 << xlate_pabit(_PAGE_FLUSH_BIT)) 175deae26bfSKyle McMartin #define _PAGE_USER (1 << xlate_pabit(_PAGE_USER_BIT)) 176deae26bfSKyle McMartin #define _PAGE_FILE (1 << xlate_pabit(_PAGE_FILE_BIT)) 177deae26bfSKyle McMartin 178deae26bfSKyle McMartin #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED) 179deae26bfSKyle McMartin #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) 180deae26bfSKyle McMartin #define _PAGE_KERNEL (_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED) 181deae26bfSKyle McMartin 182deae26bfSKyle McMartin /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds 183deae26bfSKyle McMartin * are page-aligned, we don't care about the PAGE_OFFSET bits, except 184deae26bfSKyle McMartin * for a few meta-information bits, so we shift the address to be 185deae26bfSKyle McMartin * able to effectively address 40/42/44-bits of physical address space 186deae26bfSKyle McMartin * depending on 4k/16k/64k PAGE_SIZE */ 187deae26bfSKyle McMartin #define _PxD_PRESENT_BIT 31 188deae26bfSKyle McMartin #define _PxD_ATTACHED_BIT 30 189deae26bfSKyle McMartin #define _PxD_VALID_BIT 29 190deae26bfSKyle McMartin 191deae26bfSKyle McMartin #define PxD_FLAG_PRESENT (1 << xlate_pabit(_PxD_PRESENT_BIT)) 192deae26bfSKyle McMartin #define PxD_FLAG_ATTACHED (1 << xlate_pabit(_PxD_ATTACHED_BIT)) 193deae26bfSKyle McMartin #define PxD_FLAG_VALID (1 << xlate_pabit(_PxD_VALID_BIT)) 194deae26bfSKyle McMartin #define PxD_FLAG_MASK (0xf) 195deae26bfSKyle McMartin #define PxD_FLAG_SHIFT (4) 196deae26bfSKyle McMartin #define PxD_VALUE_SHIFT (8) /* (PAGE_SHIFT-PxD_FLAG_SHIFT) */ 197deae26bfSKyle McMartin 198deae26bfSKyle McMartin #ifndef __ASSEMBLY__ 199deae26bfSKyle McMartin 200deae26bfSKyle McMartin #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) 201deae26bfSKyle McMartin #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_ACCESSED) 202deae26bfSKyle McMartin /* Others seem to make this executable, I don't know if that's correct 203deae26bfSKyle McMartin or not. The stack is mapped this way though so this is necessary 204deae26bfSKyle McMartin in the short term - dhd@linuxcare.com, 2000-08-08 */ 205deae26bfSKyle McMartin #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_ACCESSED) 206deae26bfSKyle McMartin #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE | _PAGE_ACCESSED) 207deae26bfSKyle McMartin #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC |_PAGE_ACCESSED) 208deae26bfSKyle McMartin #define PAGE_COPY PAGE_EXECREAD 209deae26bfSKyle McMartin #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC |_PAGE_ACCESSED) 210deae26bfSKyle McMartin #define PAGE_KERNEL __pgprot(_PAGE_KERNEL) 211deae26bfSKyle McMartin #define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL & ~_PAGE_WRITE) 212deae26bfSKyle McMartin #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE) 213deae26bfSKyle McMartin #define PAGE_GATEWAY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ) 214deae26bfSKyle McMartin #define PAGE_FLUSH __pgprot(_PAGE_FLUSH) 215deae26bfSKyle McMartin 216deae26bfSKyle McMartin 217deae26bfSKyle McMartin /* 218deae26bfSKyle McMartin * We could have an execute only page using "gateway - promote to priv 219deae26bfSKyle McMartin * level 3", but that is kind of silly. So, the way things are defined 220deae26bfSKyle McMartin * now, we must always have read permission for pages with execute 221deae26bfSKyle McMartin * permission. For the fun of it we'll go ahead and support write only 222deae26bfSKyle McMartin * pages. 223deae26bfSKyle McMartin */ 224deae26bfSKyle McMartin 225deae26bfSKyle McMartin /*xwr*/ 226deae26bfSKyle McMartin #define __P000 PAGE_NONE 227deae26bfSKyle McMartin #define __P001 PAGE_READONLY 228deae26bfSKyle McMartin #define __P010 __P000 /* copy on write */ 229deae26bfSKyle McMartin #define __P011 __P001 /* copy on write */ 230deae26bfSKyle McMartin #define __P100 PAGE_EXECREAD 231deae26bfSKyle McMartin #define __P101 PAGE_EXECREAD 232deae26bfSKyle McMartin #define __P110 __P100 /* copy on write */ 233deae26bfSKyle McMartin #define __P111 __P101 /* copy on write */ 234deae26bfSKyle McMartin 235deae26bfSKyle McMartin #define __S000 PAGE_NONE 236deae26bfSKyle McMartin #define __S001 PAGE_READONLY 237deae26bfSKyle McMartin #define __S010 PAGE_WRITEONLY 238deae26bfSKyle McMartin #define __S011 PAGE_SHARED 239deae26bfSKyle McMartin #define __S100 PAGE_EXECREAD 240deae26bfSKyle McMartin #define __S101 PAGE_EXECREAD 241deae26bfSKyle McMartin #define __S110 PAGE_RWX 242deae26bfSKyle McMartin #define __S111 PAGE_RWX 243deae26bfSKyle McMartin 244deae26bfSKyle McMartin 245deae26bfSKyle McMartin extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */ 246deae26bfSKyle McMartin 247deae26bfSKyle McMartin /* initial page tables for 0-8MB for kernel */ 248deae26bfSKyle McMartin 249deae26bfSKyle McMartin extern pte_t pg0[]; 250deae26bfSKyle McMartin 251deae26bfSKyle McMartin /* zero page used for uninitialized stuff */ 252deae26bfSKyle McMartin 253deae26bfSKyle McMartin extern unsigned long *empty_zero_page; 254deae26bfSKyle McMartin 255deae26bfSKyle McMartin /* 256deae26bfSKyle McMartin * ZERO_PAGE is a global shared page that is always zero: used 257deae26bfSKyle McMartin * for zero-mapped memory areas etc.. 258deae26bfSKyle McMartin */ 259deae26bfSKyle McMartin 260deae26bfSKyle McMartin #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 261deae26bfSKyle McMartin 262deae26bfSKyle McMartin #define pte_none(x) ((pte_val(x) == 0) || (pte_val(x) & _PAGE_FLUSH)) 263deae26bfSKyle McMartin #define pte_present(x) (pte_val(x) & _PAGE_PRESENT) 264deae26bfSKyle McMartin #define pte_clear(mm,addr,xp) do { pte_val(*(xp)) = 0; } while (0) 265deae26bfSKyle McMartin 266deae26bfSKyle McMartin #define pmd_flag(x) (pmd_val(x) & PxD_FLAG_MASK) 267deae26bfSKyle McMartin #define pmd_address(x) ((unsigned long)(pmd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 268deae26bfSKyle McMartin #define pgd_flag(x) (pgd_val(x) & PxD_FLAG_MASK) 269deae26bfSKyle McMartin #define pgd_address(x) ((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 270deae26bfSKyle McMartin 271deae26bfSKyle McMartin #if PT_NLEVELS == 3 272deae26bfSKyle McMartin /* The first entry of the permanent pmd is not there if it contains 273deae26bfSKyle McMartin * the gateway marker */ 274deae26bfSKyle McMartin #define pmd_none(x) (!pmd_val(x) || pmd_flag(x) == PxD_FLAG_ATTACHED) 275deae26bfSKyle McMartin #else 276deae26bfSKyle McMartin #define pmd_none(x) (!pmd_val(x)) 277deae26bfSKyle McMartin #endif 278deae26bfSKyle McMartin #define pmd_bad(x) (!(pmd_flag(x) & PxD_FLAG_VALID)) 279deae26bfSKyle McMartin #define pmd_present(x) (pmd_flag(x) & PxD_FLAG_PRESENT) 280deae26bfSKyle McMartin static inline void pmd_clear(pmd_t *pmd) { 281deae26bfSKyle McMartin #if PT_NLEVELS == 3 282deae26bfSKyle McMartin if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) 283deae26bfSKyle McMartin /* This is the entry pointing to the permanent pmd 284deae26bfSKyle McMartin * attached to the pgd; cannot clear it */ 285deae26bfSKyle McMartin __pmd_val_set(*pmd, PxD_FLAG_ATTACHED); 286deae26bfSKyle McMartin else 287deae26bfSKyle McMartin #endif 288deae26bfSKyle McMartin __pmd_val_set(*pmd, 0); 289deae26bfSKyle McMartin } 290deae26bfSKyle McMartin 291deae26bfSKyle McMartin 292deae26bfSKyle McMartin 293deae26bfSKyle McMartin #if PT_NLEVELS == 3 294deae26bfSKyle McMartin #define pgd_page_vaddr(pgd) ((unsigned long) __va(pgd_address(pgd))) 295deae26bfSKyle McMartin #define pgd_page(pgd) virt_to_page((void *)pgd_page_vaddr(pgd)) 296deae26bfSKyle McMartin 297deae26bfSKyle McMartin /* For 64 bit we have three level tables */ 298deae26bfSKyle McMartin 299deae26bfSKyle McMartin #define pgd_none(x) (!pgd_val(x)) 300deae26bfSKyle McMartin #define pgd_bad(x) (!(pgd_flag(x) & PxD_FLAG_VALID)) 301deae26bfSKyle McMartin #define pgd_present(x) (pgd_flag(x) & PxD_FLAG_PRESENT) 302deae26bfSKyle McMartin static inline void pgd_clear(pgd_t *pgd) { 303deae26bfSKyle McMartin #if PT_NLEVELS == 3 304deae26bfSKyle McMartin if(pgd_flag(*pgd) & PxD_FLAG_ATTACHED) 305deae26bfSKyle McMartin /* This is the permanent pmd attached to the pgd; cannot 306deae26bfSKyle McMartin * free it */ 307deae26bfSKyle McMartin return; 308deae26bfSKyle McMartin #endif 309deae26bfSKyle McMartin __pgd_val_set(*pgd, 0); 310deae26bfSKyle McMartin } 311deae26bfSKyle McMartin #else 312deae26bfSKyle McMartin /* 313deae26bfSKyle McMartin * The "pgd_xxx()" functions here are trivial for a folded two-level 314deae26bfSKyle McMartin * setup: the pgd is never bad, and a pmd always exists (as it's folded 315deae26bfSKyle McMartin * into the pgd entry) 316deae26bfSKyle McMartin */ 317deae26bfSKyle McMartin static inline int pgd_none(pgd_t pgd) { return 0; } 318deae26bfSKyle McMartin static inline int pgd_bad(pgd_t pgd) { return 0; } 319deae26bfSKyle McMartin static inline int pgd_present(pgd_t pgd) { return 1; } 320deae26bfSKyle McMartin static inline void pgd_clear(pgd_t * pgdp) { } 321deae26bfSKyle McMartin #endif 322deae26bfSKyle McMartin 323deae26bfSKyle McMartin /* 324deae26bfSKyle McMartin * The following only work if pte_present() is true. 325deae26bfSKyle McMartin * Undefined behaviour if not.. 326deae26bfSKyle McMartin */ 327deae26bfSKyle McMartin static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 328deae26bfSKyle McMartin static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 329deae26bfSKyle McMartin static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 330deae26bfSKyle McMartin static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 331deae26bfSKyle McMartin static inline int pte_special(pte_t pte) { return 0; } 332deae26bfSKyle McMartin 333deae26bfSKyle McMartin static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } 334deae26bfSKyle McMartin static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 335deae26bfSKyle McMartin static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; return pte; } 336deae26bfSKyle McMartin static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } 337deae26bfSKyle McMartin static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } 338deae26bfSKyle McMartin static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; } 339deae26bfSKyle McMartin static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 340deae26bfSKyle McMartin 341deae26bfSKyle McMartin /* 342deae26bfSKyle McMartin * Conversion functions: convert a page and protection to a page entry, 343deae26bfSKyle McMartin * and a page entry and page directory to the page they refer to. 344deae26bfSKyle McMartin */ 345deae26bfSKyle McMartin #define __mk_pte(addr,pgprot) \ 346deae26bfSKyle McMartin ({ \ 347deae26bfSKyle McMartin pte_t __pte; \ 348deae26bfSKyle McMartin \ 349deae26bfSKyle McMartin pte_val(__pte) = ((((addr)>>PAGE_SHIFT)<<PFN_PTE_SHIFT) + pgprot_val(pgprot)); \ 350deae26bfSKyle McMartin \ 351deae26bfSKyle McMartin __pte; \ 352deae26bfSKyle McMartin }) 353deae26bfSKyle McMartin 354deae26bfSKyle McMartin #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 355deae26bfSKyle McMartin 356deae26bfSKyle McMartin static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) 357deae26bfSKyle McMartin { 358deae26bfSKyle McMartin pte_t pte; 359deae26bfSKyle McMartin pte_val(pte) = (pfn << PFN_PTE_SHIFT) | pgprot_val(pgprot); 360deae26bfSKyle McMartin return pte; 361deae26bfSKyle McMartin } 362deae26bfSKyle McMartin 363deae26bfSKyle McMartin static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 364deae26bfSKyle McMartin { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } 365deae26bfSKyle McMartin 366deae26bfSKyle McMartin /* Permanent address of a page. On parisc we don't have highmem. */ 367deae26bfSKyle McMartin 368deae26bfSKyle McMartin #define pte_pfn(x) (pte_val(x) >> PFN_PTE_SHIFT) 369deae26bfSKyle McMartin 370deae26bfSKyle McMartin #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 371deae26bfSKyle McMartin 372deae26bfSKyle McMartin #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_address(pmd))) 373deae26bfSKyle McMartin 374deae26bfSKyle McMartin #define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd))) 375deae26bfSKyle McMartin #define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd)) 376deae26bfSKyle McMartin 377deae26bfSKyle McMartin #define pgd_index(address) ((address) >> PGDIR_SHIFT) 378deae26bfSKyle McMartin 379deae26bfSKyle McMartin /* to find an entry in a page-table-directory */ 380deae26bfSKyle McMartin #define pgd_offset(mm, address) \ 381deae26bfSKyle McMartin ((mm)->pgd + ((address) >> PGDIR_SHIFT)) 382deae26bfSKyle McMartin 383deae26bfSKyle McMartin /* to find an entry in a kernel page-table-directory */ 384deae26bfSKyle McMartin #define pgd_offset_k(address) pgd_offset(&init_mm, address) 385deae26bfSKyle McMartin 386deae26bfSKyle McMartin /* Find an entry in the second-level page table.. */ 387deae26bfSKyle McMartin 388deae26bfSKyle McMartin #if PT_NLEVELS == 3 389deae26bfSKyle McMartin #define pmd_offset(dir,address) \ 390deae26bfSKyle McMartin ((pmd_t *) pgd_page_vaddr(*(dir)) + (((address)>>PMD_SHIFT) & (PTRS_PER_PMD-1))) 391deae26bfSKyle McMartin #else 392deae26bfSKyle McMartin #define pmd_offset(dir,addr) ((pmd_t *) dir) 393deae26bfSKyle McMartin #endif 394deae26bfSKyle McMartin 395deae26bfSKyle McMartin /* Find an entry in the third-level page table.. */ 396deae26bfSKyle McMartin #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) 397deae26bfSKyle McMartin #define pte_offset_kernel(pmd, address) \ 398deae26bfSKyle McMartin ((pte_t *) pmd_page_vaddr(*(pmd)) + pte_index(address)) 399deae26bfSKyle McMartin #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) 400deae26bfSKyle McMartin #define pte_offset_map_nested(pmd, address) pte_offset_kernel(pmd, address) 401deae26bfSKyle McMartin #define pte_unmap(pte) do { } while (0) 402deae26bfSKyle McMartin #define pte_unmap_nested(pte) do { } while (0) 403deae26bfSKyle McMartin 404deae26bfSKyle McMartin #define pte_unmap(pte) do { } while (0) 405deae26bfSKyle McMartin #define pte_unmap_nested(pte) do { } while (0) 406deae26bfSKyle McMartin 407deae26bfSKyle McMartin extern void paging_init (void); 408deae26bfSKyle McMartin 409deae26bfSKyle McMartin /* Used for deferring calls to flush_dcache_page() */ 410deae26bfSKyle McMartin 411deae26bfSKyle McMartin #define PG_dcache_dirty PG_arch_1 412deae26bfSKyle McMartin 4134b3073e1SRussell King extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *); 414deae26bfSKyle McMartin 415deae26bfSKyle McMartin /* Encode and de-code a swap entry */ 416deae26bfSKyle McMartin 417deae26bfSKyle McMartin #define __swp_type(x) ((x).val & 0x1f) 418deae26bfSKyle McMartin #define __swp_offset(x) ( (((x).val >> 6) & 0x7) | \ 419deae26bfSKyle McMartin (((x).val >> 8) & ~0x7) ) 420deae26bfSKyle McMartin #define __swp_entry(type, offset) ((swp_entry_t) { (type) | \ 421deae26bfSKyle McMartin ((offset & 0x7) << 6) | \ 422deae26bfSKyle McMartin ((offset & ~0x7) << 8) }) 423deae26bfSKyle McMartin #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 424deae26bfSKyle McMartin #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 425deae26bfSKyle McMartin 426deae26bfSKyle McMartin static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) 427deae26bfSKyle McMartin { 428deae26bfSKyle McMartin #ifdef CONFIG_SMP 429deae26bfSKyle McMartin if (!pte_young(*ptep)) 430deae26bfSKyle McMartin return 0; 431deae26bfSKyle McMartin return test_and_clear_bit(xlate_pabit(_PAGE_ACCESSED_BIT), &pte_val(*ptep)); 432deae26bfSKyle McMartin #else 433deae26bfSKyle McMartin pte_t pte = *ptep; 434deae26bfSKyle McMartin if (!pte_young(pte)) 435deae26bfSKyle McMartin return 0; 436deae26bfSKyle McMartin set_pte_at(vma->vm_mm, addr, ptep, pte_mkold(pte)); 437deae26bfSKyle McMartin return 1; 438deae26bfSKyle McMartin #endif 439deae26bfSKyle McMartin } 440deae26bfSKyle McMartin 441deae26bfSKyle McMartin extern spinlock_t pa_dbit_lock; 442deae26bfSKyle McMartin 443deae26bfSKyle McMartin struct mm_struct; 444deae26bfSKyle McMartin static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 445deae26bfSKyle McMartin { 446deae26bfSKyle McMartin pte_t old_pte; 447deae26bfSKyle McMartin pte_t pte; 448deae26bfSKyle McMartin 449deae26bfSKyle McMartin spin_lock(&pa_dbit_lock); 450deae26bfSKyle McMartin pte = old_pte = *ptep; 451deae26bfSKyle McMartin pte_val(pte) &= ~_PAGE_PRESENT; 452deae26bfSKyle McMartin pte_val(pte) |= _PAGE_FLUSH; 453deae26bfSKyle McMartin set_pte_at(mm,addr,ptep,pte); 454deae26bfSKyle McMartin spin_unlock(&pa_dbit_lock); 455deae26bfSKyle McMartin 456deae26bfSKyle McMartin return old_pte; 457deae26bfSKyle McMartin } 458deae26bfSKyle McMartin 459deae26bfSKyle McMartin static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 460deae26bfSKyle McMartin { 461deae26bfSKyle McMartin #ifdef CONFIG_SMP 462deae26bfSKyle McMartin unsigned long new, old; 463deae26bfSKyle McMartin 464deae26bfSKyle McMartin do { 465deae26bfSKyle McMartin old = pte_val(*ptep); 466deae26bfSKyle McMartin new = pte_val(pte_wrprotect(__pte (old))); 467deae26bfSKyle McMartin } while (cmpxchg((unsigned long *) ptep, old, new) != old); 468deae26bfSKyle McMartin #else 469deae26bfSKyle McMartin pte_t old_pte = *ptep; 470deae26bfSKyle McMartin set_pte_at(mm, addr, ptep, pte_wrprotect(old_pte)); 471deae26bfSKyle McMartin #endif 472deae26bfSKyle McMartin } 473deae26bfSKyle McMartin 474deae26bfSKyle McMartin #define pte_same(A,B) (pte_val(A) == pte_val(B)) 475deae26bfSKyle McMartin 476deae26bfSKyle McMartin #endif /* !__ASSEMBLY__ */ 477deae26bfSKyle McMartin 478deae26bfSKyle McMartin 479deae26bfSKyle McMartin /* TLB page size encoding - see table 3-1 in parisc20.pdf */ 480deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_4K 0 481deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_16K 1 482deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_64K 2 483deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_256K 3 484deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_1M 4 485deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_4M 5 486deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_16M 6 487deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_64M 7 488deae26bfSKyle McMartin 489deae26bfSKyle McMartin #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 490deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4K 491deae26bfSKyle McMartin #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB) 492deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16K 493deae26bfSKyle McMartin #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB) 494deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_64K 495deae26bfSKyle McMartin #endif 496deae26bfSKyle McMartin 497deae26bfSKyle McMartin 498deae26bfSKyle McMartin #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 499deae26bfSKyle McMartin remap_pfn_range(vma, vaddr, pfn, size, prot) 500deae26bfSKyle McMartin 501deae26bfSKyle McMartin #define pgprot_noncached(prot) __pgprot(pgprot_val(prot) | _PAGE_NO_CACHE) 502deae26bfSKyle McMartin 503deae26bfSKyle McMartin /* We provide our own get_unmapped_area to provide cache coherency */ 504deae26bfSKyle McMartin 505deae26bfSKyle McMartin #define HAVE_ARCH_UNMAPPED_AREA 506deae26bfSKyle McMartin 507deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 508deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 509deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_SET_WRPROTECT 510deae26bfSKyle McMartin #define __HAVE_ARCH_PTE_SAME 511deae26bfSKyle McMartin #include <asm-generic/pgtable.h> 512deae26bfSKyle McMartin 513deae26bfSKyle McMartin #endif /* _PARISC_PGTABLE_H */ 514