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/bitops.h> 1411537421SJames Bottomley #include <linux/spinlock.h> 157139bc15SJohn David Anglin #include <linux/mm_types.h> 16deae26bfSKyle McMartin #include <asm/processor.h> 17deae26bfSKyle McMartin #include <asm/cache.h> 18deae26bfSKyle McMartin 19bda079d3SJohn David Anglin extern spinlock_t pa_dbit_lock; 20bda079d3SJohn David Anglin 21deae26bfSKyle McMartin /* 22deae26bfSKyle McMartin * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel 23deae26bfSKyle McMartin * memory. For the return value to be meaningful, ADDR must be >= 24deae26bfSKyle McMartin * PAGE_OFFSET. This operation can be relatively expensive (e.g., 25deae26bfSKyle McMartin * require a hash-, or multi-level tree-lookup or something of that 26deae26bfSKyle McMartin * sort) but it guarantees to return TRUE only if accessing the page 27deae26bfSKyle McMartin * at that address does not cause an error. Note that there may be 28deae26bfSKyle McMartin * addresses for which kern_addr_valid() returns FALSE even though an 29deae26bfSKyle McMartin * access would not cause an error (e.g., this is typically true for 30deae26bfSKyle McMartin * memory mapped I/O regions. 31deae26bfSKyle McMartin * 32deae26bfSKyle McMartin * XXX Need to implement this for parisc. 33deae26bfSKyle McMartin */ 34deae26bfSKyle McMartin #define kern_addr_valid(addr) (1) 35deae26bfSKyle McMartin 36deae26bfSKyle McMartin /* Certain architectures need to do special things when PTEs 37deae26bfSKyle McMartin * within a page table are directly modified. Thus, the following 38deae26bfSKyle McMartin * hook is made available. 39deae26bfSKyle McMartin */ 40deae26bfSKyle McMartin #define set_pte(pteptr, pteval) \ 41deae26bfSKyle McMartin do{ \ 42deae26bfSKyle McMartin *(pteptr) = (pteval); \ 43deae26bfSKyle McMartin } while(0) 447139bc15SJohn David Anglin 457139bc15SJohn David Anglin extern void purge_tlb_entries(struct mm_struct *, unsigned long); 467139bc15SJohn David Anglin 477139bc15SJohn David Anglin #define set_pte_at(mm, addr, ptep, pteval) \ 487139bc15SJohn David Anglin do { \ 49bda079d3SJohn David Anglin unsigned long flags; \ 50bda079d3SJohn David Anglin spin_lock_irqsave(&pa_dbit_lock, flags); \ 517139bc15SJohn David Anglin set_pte(ptep, pteval); \ 527139bc15SJohn David Anglin purge_tlb_entries(mm, addr); \ 53bda079d3SJohn David Anglin spin_unlock_irqrestore(&pa_dbit_lock, flags); \ 547139bc15SJohn David Anglin } while (0) 55deae26bfSKyle McMartin 56deae26bfSKyle McMartin #endif /* !__ASSEMBLY__ */ 57deae26bfSKyle McMartin 589b05b1ecSRolf Eike Beer #include <asm/page.h> 599b05b1ecSRolf Eike Beer 60deae26bfSKyle McMartin #define pte_ERROR(e) \ 61deae26bfSKyle McMartin printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 62deae26bfSKyle McMartin #define pmd_ERROR(e) \ 63deae26bfSKyle McMartin printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, (unsigned long)pmd_val(e)) 64deae26bfSKyle McMartin #define pgd_ERROR(e) \ 65deae26bfSKyle McMartin printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e)) 66deae26bfSKyle McMartin 67deae26bfSKyle McMartin /* This is the size of the initially mapped kernel memory */ 68deae26bfSKyle McMartin #define KERNEL_INITIAL_ORDER 24 /* 0 to 1<<24 = 16MB */ 69deae26bfSKyle McMartin #define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER) 70deae26bfSKyle McMartin 71deae26bfSKyle McMartin #if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB) 72deae26bfSKyle McMartin #define PT_NLEVELS 3 73deae26bfSKyle McMartin #define PGD_ORDER 1 /* Number of pages per pgd */ 74deae26bfSKyle McMartin #define PMD_ORDER 1 /* Number of pages per pmd */ 75deae26bfSKyle McMartin #define PGD_ALLOC_ORDER 2 /* first pgd contains pmd */ 76deae26bfSKyle McMartin #else 77deae26bfSKyle McMartin #define PT_NLEVELS 2 78deae26bfSKyle McMartin #define PGD_ORDER 1 /* Number of pages per pgd */ 79deae26bfSKyle McMartin #define PGD_ALLOC_ORDER PGD_ORDER 80deae26bfSKyle McMartin #endif 81deae26bfSKyle McMartin 82deae26bfSKyle McMartin /* Definitions for 3rd level (we use PLD here for Page Lower directory 83deae26bfSKyle McMartin * because PTE_SHIFT is used lower down to mean shift that has to be 84deae26bfSKyle McMartin * done to get usable bits out of the PTE) */ 85deae26bfSKyle McMartin #define PLD_SHIFT PAGE_SHIFT 86deae26bfSKyle McMartin #define PLD_SIZE PAGE_SIZE 87deae26bfSKyle McMartin #define BITS_PER_PTE (PAGE_SHIFT - BITS_PER_PTE_ENTRY) 88deae26bfSKyle McMartin #define PTRS_PER_PTE (1UL << BITS_PER_PTE) 89deae26bfSKyle McMartin 90deae26bfSKyle McMartin /* Definitions for 2nd level */ 91deae26bfSKyle McMartin #define pgtable_cache_init() do { } while (0) 92deae26bfSKyle McMartin 93deae26bfSKyle McMartin #define PMD_SHIFT (PLD_SHIFT + BITS_PER_PTE) 94deae26bfSKyle McMartin #define PMD_SIZE (1UL << PMD_SHIFT) 95deae26bfSKyle McMartin #define PMD_MASK (~(PMD_SIZE-1)) 96deae26bfSKyle McMartin #if PT_NLEVELS == 3 97deae26bfSKyle McMartin #define BITS_PER_PMD (PAGE_SHIFT + PMD_ORDER - BITS_PER_PMD_ENTRY) 98deae26bfSKyle McMartin #else 99deae26bfSKyle McMartin #define BITS_PER_PMD 0 100deae26bfSKyle McMartin #endif 101deae26bfSKyle McMartin #define PTRS_PER_PMD (1UL << BITS_PER_PMD) 102deae26bfSKyle McMartin 103deae26bfSKyle McMartin /* Definitions for 1st level */ 104deae26bfSKyle McMartin #define PGDIR_SHIFT (PMD_SHIFT + BITS_PER_PMD) 10548d27cb2SHelge Deller #if (PGDIR_SHIFT + PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) > BITS_PER_LONG 10648d27cb2SHelge Deller #define BITS_PER_PGD (BITS_PER_LONG - PGDIR_SHIFT) 10748d27cb2SHelge Deller #else 108deae26bfSKyle McMartin #define BITS_PER_PGD (PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) 10948d27cb2SHelge Deller #endif 110deae26bfSKyle McMartin #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 111deae26bfSKyle McMartin #define PGDIR_MASK (~(PGDIR_SIZE-1)) 112deae26bfSKyle McMartin #define PTRS_PER_PGD (1UL << BITS_PER_PGD) 113deae26bfSKyle McMartin #define USER_PTRS_PER_PGD PTRS_PER_PGD 114deae26bfSKyle McMartin 11548d27cb2SHelge Deller #ifdef CONFIG_64BIT 116deae26bfSKyle McMartin #define MAX_ADDRBITS (PGDIR_SHIFT + BITS_PER_PGD) 117deae26bfSKyle McMartin #define MAX_ADDRESS (1UL << MAX_ADDRBITS) 118deae26bfSKyle McMartin #define SPACEID_SHIFT (MAX_ADDRBITS - 32) 11948d27cb2SHelge Deller #else 12048d27cb2SHelge Deller #define MAX_ADDRBITS (BITS_PER_LONG) 12148d27cb2SHelge Deller #define MAX_ADDRESS (1UL << MAX_ADDRBITS) 12248d27cb2SHelge Deller #define SPACEID_SHIFT 0 12348d27cb2SHelge Deller #endif 124deae26bfSKyle McMartin 125deae26bfSKyle McMartin /* This calculates the number of initial pages we need for the initial 126deae26bfSKyle McMartin * page tables */ 127deae26bfSKyle McMartin #if (KERNEL_INITIAL_ORDER) >= (PMD_SHIFT) 128deae26bfSKyle McMartin # define PT_INITIAL (1 << (KERNEL_INITIAL_ORDER - PMD_SHIFT)) 129deae26bfSKyle McMartin #else 130deae26bfSKyle McMartin # define PT_INITIAL (1) /* all initial PTEs fit into one page */ 131deae26bfSKyle McMartin #endif 132deae26bfSKyle McMartin 133deae26bfSKyle McMartin /* 134deae26bfSKyle McMartin * pgd entries used up by user/kernel: 135deae26bfSKyle McMartin */ 136deae26bfSKyle McMartin 137deae26bfSKyle McMartin #define FIRST_USER_ADDRESS 0 138deae26bfSKyle McMartin 139deae26bfSKyle McMartin /* NB: The tlb miss handlers make certain assumptions about the order */ 140deae26bfSKyle McMartin /* of the following bits, so be careful (One example, bits 25-31 */ 141deae26bfSKyle McMartin /* are moved together in one instruction). */ 142deae26bfSKyle McMartin 143deae26bfSKyle McMartin #define _PAGE_READ_BIT 31 /* (0x001) read access allowed */ 144deae26bfSKyle McMartin #define _PAGE_WRITE_BIT 30 /* (0x002) write access allowed */ 145deae26bfSKyle McMartin #define _PAGE_EXEC_BIT 29 /* (0x004) execute access allowed */ 146deae26bfSKyle McMartin #define _PAGE_GATEWAY_BIT 28 /* (0x008) privilege promotion allowed */ 147deae26bfSKyle McMartin #define _PAGE_DMB_BIT 27 /* (0x010) Data Memory Break enable (B bit) */ 148deae26bfSKyle McMartin #define _PAGE_DIRTY_BIT 26 /* (0x020) Page Dirty (D bit) */ 149deae26bfSKyle McMartin #define _PAGE_FILE_BIT _PAGE_DIRTY_BIT /* overload this bit */ 150deae26bfSKyle McMartin #define _PAGE_REFTRAP_BIT 25 /* (0x040) Page Ref. Trap enable (T bit) */ 151deae26bfSKyle McMartin #define _PAGE_NO_CACHE_BIT 24 /* (0x080) Uncached Page (U bit) */ 152deae26bfSKyle McMartin #define _PAGE_ACCESSED_BIT 23 /* (0x100) Software: Page Accessed */ 153deae26bfSKyle McMartin #define _PAGE_PRESENT_BIT 22 /* (0x200) Software: translation valid */ 1548b4ae334SJames Bottomley /* bit 21 was formerly the FLUSH bit but is now unused */ 155deae26bfSKyle McMartin #define _PAGE_USER_BIT 20 /* (0x800) Software: User accessible page */ 156deae26bfSKyle McMartin 157deae26bfSKyle McMartin /* N.B. The bits are defined in terms of a 32 bit word above, so the */ 158deae26bfSKyle McMartin /* following macro is ok for both 32 and 64 bit. */ 159deae26bfSKyle McMartin 160deae26bfSKyle McMartin #define xlate_pabit(x) (31 - x) 161deae26bfSKyle McMartin 162deae26bfSKyle McMartin /* this defines the shift to the usable bits in the PTE it is set so 163deae26bfSKyle McMartin * that the valid bits _PAGE_PRESENT_BIT and _PAGE_USER_BIT are set 164deae26bfSKyle McMartin * to zero */ 165deae26bfSKyle McMartin #define PTE_SHIFT xlate_pabit(_PAGE_USER_BIT) 166deae26bfSKyle McMartin 167deae26bfSKyle McMartin /* PFN_PTE_SHIFT defines the shift of a PTE value to access the PFN field */ 168deae26bfSKyle McMartin #define PFN_PTE_SHIFT 12 169deae26bfSKyle McMartin 170deae26bfSKyle McMartin 171deae26bfSKyle McMartin /* this is how many bits may be used by the file functions */ 172deae26bfSKyle McMartin #define PTE_FILE_MAX_BITS (BITS_PER_LONG - PTE_SHIFT) 173deae26bfSKyle McMartin 174deae26bfSKyle McMartin #define pte_to_pgoff(pte) (pte_val(pte) >> PTE_SHIFT) 175deae26bfSKyle McMartin #define pgoff_to_pte(off) ((pte_t) { ((off) << PTE_SHIFT) | _PAGE_FILE }) 176deae26bfSKyle McMartin 177deae26bfSKyle McMartin #define _PAGE_READ (1 << xlate_pabit(_PAGE_READ_BIT)) 178deae26bfSKyle McMartin #define _PAGE_WRITE (1 << xlate_pabit(_PAGE_WRITE_BIT)) 179deae26bfSKyle McMartin #define _PAGE_RW (_PAGE_READ | _PAGE_WRITE) 180deae26bfSKyle McMartin #define _PAGE_EXEC (1 << xlate_pabit(_PAGE_EXEC_BIT)) 181deae26bfSKyle McMartin #define _PAGE_GATEWAY (1 << xlate_pabit(_PAGE_GATEWAY_BIT)) 182deae26bfSKyle McMartin #define _PAGE_DMB (1 << xlate_pabit(_PAGE_DMB_BIT)) 183deae26bfSKyle McMartin #define _PAGE_DIRTY (1 << xlate_pabit(_PAGE_DIRTY_BIT)) 184deae26bfSKyle McMartin #define _PAGE_REFTRAP (1 << xlate_pabit(_PAGE_REFTRAP_BIT)) 185deae26bfSKyle McMartin #define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT)) 186deae26bfSKyle McMartin #define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT)) 187deae26bfSKyle McMartin #define _PAGE_PRESENT (1 << xlate_pabit(_PAGE_PRESENT_BIT)) 188deae26bfSKyle McMartin #define _PAGE_USER (1 << xlate_pabit(_PAGE_USER_BIT)) 189deae26bfSKyle McMartin #define _PAGE_FILE (1 << xlate_pabit(_PAGE_FILE_BIT)) 190deae26bfSKyle McMartin 191deae26bfSKyle McMartin #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED) 192deae26bfSKyle McMartin #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) 193d7dd2ff1SJames Bottomley #define _PAGE_KERNEL_RO (_PAGE_PRESENT | _PAGE_READ | _PAGE_DIRTY | _PAGE_ACCESSED) 194d7dd2ff1SJames Bottomley #define _PAGE_KERNEL_EXEC (_PAGE_KERNEL_RO | _PAGE_EXEC) 195d7dd2ff1SJames Bottomley #define _PAGE_KERNEL_RWX (_PAGE_KERNEL_EXEC | _PAGE_WRITE) 196d7dd2ff1SJames Bottomley #define _PAGE_KERNEL (_PAGE_KERNEL_RO | _PAGE_WRITE) 197deae26bfSKyle McMartin 198deae26bfSKyle McMartin /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds 199deae26bfSKyle McMartin * are page-aligned, we don't care about the PAGE_OFFSET bits, except 200deae26bfSKyle McMartin * for a few meta-information bits, so we shift the address to be 201deae26bfSKyle McMartin * able to effectively address 40/42/44-bits of physical address space 202deae26bfSKyle McMartin * depending on 4k/16k/64k PAGE_SIZE */ 203deae26bfSKyle McMartin #define _PxD_PRESENT_BIT 31 204deae26bfSKyle McMartin #define _PxD_ATTACHED_BIT 30 205deae26bfSKyle McMartin #define _PxD_VALID_BIT 29 206deae26bfSKyle McMartin 207deae26bfSKyle McMartin #define PxD_FLAG_PRESENT (1 << xlate_pabit(_PxD_PRESENT_BIT)) 208deae26bfSKyle McMartin #define PxD_FLAG_ATTACHED (1 << xlate_pabit(_PxD_ATTACHED_BIT)) 209deae26bfSKyle McMartin #define PxD_FLAG_VALID (1 << xlate_pabit(_PxD_VALID_BIT)) 210deae26bfSKyle McMartin #define PxD_FLAG_MASK (0xf) 211deae26bfSKyle McMartin #define PxD_FLAG_SHIFT (4) 212deae26bfSKyle McMartin #define PxD_VALUE_SHIFT (8) /* (PAGE_SHIFT-PxD_FLAG_SHIFT) */ 213deae26bfSKyle McMartin 214deae26bfSKyle McMartin #ifndef __ASSEMBLY__ 215deae26bfSKyle McMartin 216deae26bfSKyle McMartin #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) 217deae26bfSKyle McMartin #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_ACCESSED) 218deae26bfSKyle McMartin /* Others seem to make this executable, I don't know if that's correct 219deae26bfSKyle McMartin or not. The stack is mapped this way though so this is necessary 220deae26bfSKyle McMartin in the short term - dhd@linuxcare.com, 2000-08-08 */ 221deae26bfSKyle McMartin #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_ACCESSED) 222deae26bfSKyle McMartin #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE | _PAGE_ACCESSED) 223deae26bfSKyle McMartin #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC |_PAGE_ACCESSED) 224deae26bfSKyle McMartin #define PAGE_COPY PAGE_EXECREAD 225deae26bfSKyle McMartin #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC |_PAGE_ACCESSED) 226deae26bfSKyle McMartin #define PAGE_KERNEL __pgprot(_PAGE_KERNEL) 227d7dd2ff1SJames Bottomley #define PAGE_KERNEL_EXEC __pgprot(_PAGE_KERNEL_EXEC) 228d7dd2ff1SJames Bottomley #define PAGE_KERNEL_RWX __pgprot(_PAGE_KERNEL_RWX) 229d7dd2ff1SJames Bottomley #define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL_RO) 230deae26bfSKyle McMartin #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE) 231deae26bfSKyle McMartin #define PAGE_GATEWAY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ) 232deae26bfSKyle McMartin 233deae26bfSKyle McMartin 234deae26bfSKyle McMartin /* 235deae26bfSKyle McMartin * We could have an execute only page using "gateway - promote to priv 236deae26bfSKyle McMartin * level 3", but that is kind of silly. So, the way things are defined 237deae26bfSKyle McMartin * now, we must always have read permission for pages with execute 238deae26bfSKyle McMartin * permission. For the fun of it we'll go ahead and support write only 239deae26bfSKyle McMartin * pages. 240deae26bfSKyle McMartin */ 241deae26bfSKyle McMartin 242deae26bfSKyle McMartin /*xwr*/ 243deae26bfSKyle McMartin #define __P000 PAGE_NONE 244deae26bfSKyle McMartin #define __P001 PAGE_READONLY 245deae26bfSKyle McMartin #define __P010 __P000 /* copy on write */ 246deae26bfSKyle McMartin #define __P011 __P001 /* copy on write */ 247deae26bfSKyle McMartin #define __P100 PAGE_EXECREAD 248deae26bfSKyle McMartin #define __P101 PAGE_EXECREAD 249deae26bfSKyle McMartin #define __P110 __P100 /* copy on write */ 250deae26bfSKyle McMartin #define __P111 __P101 /* copy on write */ 251deae26bfSKyle McMartin 252deae26bfSKyle McMartin #define __S000 PAGE_NONE 253deae26bfSKyle McMartin #define __S001 PAGE_READONLY 254deae26bfSKyle McMartin #define __S010 PAGE_WRITEONLY 255deae26bfSKyle McMartin #define __S011 PAGE_SHARED 256deae26bfSKyle McMartin #define __S100 PAGE_EXECREAD 257deae26bfSKyle McMartin #define __S101 PAGE_EXECREAD 258deae26bfSKyle McMartin #define __S110 PAGE_RWX 259deae26bfSKyle McMartin #define __S111 PAGE_RWX 260deae26bfSKyle McMartin 261deae26bfSKyle McMartin 262deae26bfSKyle McMartin extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */ 263deae26bfSKyle McMartin 264deae26bfSKyle McMartin /* initial page tables for 0-8MB for kernel */ 265deae26bfSKyle McMartin 266deae26bfSKyle McMartin extern pte_t pg0[]; 267deae26bfSKyle McMartin 268deae26bfSKyle McMartin /* zero page used for uninitialized stuff */ 269deae26bfSKyle McMartin 270deae26bfSKyle McMartin extern unsigned long *empty_zero_page; 271deae26bfSKyle McMartin 272deae26bfSKyle McMartin /* 273deae26bfSKyle McMartin * ZERO_PAGE is a global shared page that is always zero: used 274deae26bfSKyle McMartin * for zero-mapped memory areas etc.. 275deae26bfSKyle McMartin */ 276deae26bfSKyle McMartin 277deae26bfSKyle McMartin #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 278deae26bfSKyle McMartin 2798b4ae334SJames Bottomley #define pte_none(x) (pte_val(x) == 0) 280deae26bfSKyle McMartin #define pte_present(x) (pte_val(x) & _PAGE_PRESENT) 281deae26bfSKyle McMartin #define pte_clear(mm,addr,xp) do { pte_val(*(xp)) = 0; } while (0) 282deae26bfSKyle McMartin 283deae26bfSKyle McMartin #define pmd_flag(x) (pmd_val(x) & PxD_FLAG_MASK) 284deae26bfSKyle McMartin #define pmd_address(x) ((unsigned long)(pmd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 285deae26bfSKyle McMartin #define pgd_flag(x) (pgd_val(x) & PxD_FLAG_MASK) 286deae26bfSKyle McMartin #define pgd_address(x) ((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 287deae26bfSKyle McMartin 288deae26bfSKyle McMartin #if PT_NLEVELS == 3 289deae26bfSKyle McMartin /* The first entry of the permanent pmd is not there if it contains 290deae26bfSKyle McMartin * the gateway marker */ 291deae26bfSKyle McMartin #define pmd_none(x) (!pmd_val(x) || pmd_flag(x) == PxD_FLAG_ATTACHED) 292deae26bfSKyle McMartin #else 293deae26bfSKyle McMartin #define pmd_none(x) (!pmd_val(x)) 294deae26bfSKyle McMartin #endif 295deae26bfSKyle McMartin #define pmd_bad(x) (!(pmd_flag(x) & PxD_FLAG_VALID)) 296deae26bfSKyle McMartin #define pmd_present(x) (pmd_flag(x) & PxD_FLAG_PRESENT) 297deae26bfSKyle McMartin static inline void pmd_clear(pmd_t *pmd) { 298deae26bfSKyle McMartin #if PT_NLEVELS == 3 299deae26bfSKyle McMartin if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) 300deae26bfSKyle McMartin /* This is the entry pointing to the permanent pmd 301deae26bfSKyle McMartin * attached to the pgd; cannot clear it */ 302deae26bfSKyle McMartin __pmd_val_set(*pmd, PxD_FLAG_ATTACHED); 303deae26bfSKyle McMartin else 304deae26bfSKyle McMartin #endif 305deae26bfSKyle McMartin __pmd_val_set(*pmd, 0); 306deae26bfSKyle McMartin } 307deae26bfSKyle McMartin 308deae26bfSKyle McMartin 309deae26bfSKyle McMartin 310deae26bfSKyle McMartin #if PT_NLEVELS == 3 311deae26bfSKyle McMartin #define pgd_page_vaddr(pgd) ((unsigned long) __va(pgd_address(pgd))) 312deae26bfSKyle McMartin #define pgd_page(pgd) virt_to_page((void *)pgd_page_vaddr(pgd)) 313deae26bfSKyle McMartin 314deae26bfSKyle McMartin /* For 64 bit we have three level tables */ 315deae26bfSKyle McMartin 316deae26bfSKyle McMartin #define pgd_none(x) (!pgd_val(x)) 317deae26bfSKyle McMartin #define pgd_bad(x) (!(pgd_flag(x) & PxD_FLAG_VALID)) 318deae26bfSKyle McMartin #define pgd_present(x) (pgd_flag(x) & PxD_FLAG_PRESENT) 319deae26bfSKyle McMartin static inline void pgd_clear(pgd_t *pgd) { 320deae26bfSKyle McMartin #if PT_NLEVELS == 3 321deae26bfSKyle McMartin if(pgd_flag(*pgd) & PxD_FLAG_ATTACHED) 322deae26bfSKyle McMartin /* This is the permanent pmd attached to the pgd; cannot 323deae26bfSKyle McMartin * free it */ 324deae26bfSKyle McMartin return; 325deae26bfSKyle McMartin #endif 326deae26bfSKyle McMartin __pgd_val_set(*pgd, 0); 327deae26bfSKyle McMartin } 328deae26bfSKyle McMartin #else 329deae26bfSKyle McMartin /* 330deae26bfSKyle McMartin * The "pgd_xxx()" functions here are trivial for a folded two-level 331deae26bfSKyle McMartin * setup: the pgd is never bad, and a pmd always exists (as it's folded 332deae26bfSKyle McMartin * into the pgd entry) 333deae26bfSKyle McMartin */ 334deae26bfSKyle McMartin static inline int pgd_none(pgd_t pgd) { return 0; } 335deae26bfSKyle McMartin static inline int pgd_bad(pgd_t pgd) { return 0; } 336deae26bfSKyle McMartin static inline int pgd_present(pgd_t pgd) { return 1; } 337deae26bfSKyle McMartin static inline void pgd_clear(pgd_t * pgdp) { } 338deae26bfSKyle McMartin #endif 339deae26bfSKyle McMartin 340deae26bfSKyle McMartin /* 341deae26bfSKyle McMartin * The following only work if pte_present() is true. 342deae26bfSKyle McMartin * Undefined behaviour if not.. 343deae26bfSKyle McMartin */ 344deae26bfSKyle McMartin static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 345deae26bfSKyle McMartin static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 346deae26bfSKyle McMartin static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 347deae26bfSKyle McMartin static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 348deae26bfSKyle McMartin static inline int pte_special(pte_t pte) { return 0; } 349deae26bfSKyle McMartin 350deae26bfSKyle McMartin static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } 351deae26bfSKyle McMartin static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 352deae26bfSKyle McMartin static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; return pte; } 353deae26bfSKyle McMartin static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } 354deae26bfSKyle McMartin static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } 355deae26bfSKyle McMartin static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; } 356deae26bfSKyle McMartin static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 357deae26bfSKyle McMartin 358deae26bfSKyle McMartin /* 359deae26bfSKyle McMartin * Conversion functions: convert a page and protection to a page entry, 360deae26bfSKyle McMartin * and a page entry and page directory to the page they refer to. 361deae26bfSKyle McMartin */ 362deae26bfSKyle McMartin #define __mk_pte(addr,pgprot) \ 363deae26bfSKyle McMartin ({ \ 364deae26bfSKyle McMartin pte_t __pte; \ 365deae26bfSKyle McMartin \ 366deae26bfSKyle McMartin pte_val(__pte) = ((((addr)>>PAGE_SHIFT)<<PFN_PTE_SHIFT) + pgprot_val(pgprot)); \ 367deae26bfSKyle McMartin \ 368deae26bfSKyle McMartin __pte; \ 369deae26bfSKyle McMartin }) 370deae26bfSKyle McMartin 371deae26bfSKyle McMartin #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 372deae26bfSKyle McMartin 373deae26bfSKyle McMartin static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) 374deae26bfSKyle McMartin { 375deae26bfSKyle McMartin pte_t pte; 376deae26bfSKyle McMartin pte_val(pte) = (pfn << PFN_PTE_SHIFT) | pgprot_val(pgprot); 377deae26bfSKyle McMartin return pte; 378deae26bfSKyle McMartin } 379deae26bfSKyle McMartin 380deae26bfSKyle McMartin static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 381deae26bfSKyle McMartin { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } 382deae26bfSKyle McMartin 383deae26bfSKyle McMartin /* Permanent address of a page. On parisc we don't have highmem. */ 384deae26bfSKyle McMartin 385deae26bfSKyle McMartin #define pte_pfn(x) (pte_val(x) >> PFN_PTE_SHIFT) 386deae26bfSKyle McMartin 387deae26bfSKyle McMartin #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 388deae26bfSKyle McMartin 389deae26bfSKyle McMartin #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_address(pmd))) 390deae26bfSKyle McMartin 391deae26bfSKyle McMartin #define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd))) 392deae26bfSKyle McMartin #define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd)) 393deae26bfSKyle McMartin 394deae26bfSKyle McMartin #define pgd_index(address) ((address) >> PGDIR_SHIFT) 395deae26bfSKyle McMartin 396deae26bfSKyle McMartin /* to find an entry in a page-table-directory */ 397deae26bfSKyle McMartin #define pgd_offset(mm, address) \ 398deae26bfSKyle McMartin ((mm)->pgd + ((address) >> PGDIR_SHIFT)) 399deae26bfSKyle McMartin 400deae26bfSKyle McMartin /* to find an entry in a kernel page-table-directory */ 401deae26bfSKyle McMartin #define pgd_offset_k(address) pgd_offset(&init_mm, address) 402deae26bfSKyle McMartin 403deae26bfSKyle McMartin /* Find an entry in the second-level page table.. */ 404deae26bfSKyle McMartin 405deae26bfSKyle McMartin #if PT_NLEVELS == 3 406deae26bfSKyle McMartin #define pmd_offset(dir,address) \ 407deae26bfSKyle McMartin ((pmd_t *) pgd_page_vaddr(*(dir)) + (((address)>>PMD_SHIFT) & (PTRS_PER_PMD-1))) 408deae26bfSKyle McMartin #else 409deae26bfSKyle McMartin #define pmd_offset(dir,addr) ((pmd_t *) dir) 410deae26bfSKyle McMartin #endif 411deae26bfSKyle McMartin 412deae26bfSKyle McMartin /* Find an entry in the third-level page table.. */ 413deae26bfSKyle McMartin #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) 414deae26bfSKyle McMartin #define pte_offset_kernel(pmd, address) \ 415deae26bfSKyle McMartin ((pte_t *) pmd_page_vaddr(*(pmd)) + pte_index(address)) 416deae26bfSKyle McMartin #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) 417deae26bfSKyle McMartin #define pte_unmap(pte) do { } while (0) 418deae26bfSKyle McMartin 419deae26bfSKyle McMartin #define pte_unmap(pte) do { } while (0) 420deae26bfSKyle McMartin #define pte_unmap_nested(pte) do { } while (0) 421deae26bfSKyle McMartin 422deae26bfSKyle McMartin extern void paging_init (void); 423deae26bfSKyle McMartin 424deae26bfSKyle McMartin /* Used for deferring calls to flush_dcache_page() */ 425deae26bfSKyle McMartin 426deae26bfSKyle McMartin #define PG_dcache_dirty PG_arch_1 427deae26bfSKyle McMartin 4284b3073e1SRussell King extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *); 429deae26bfSKyle McMartin 430deae26bfSKyle McMartin /* Encode and de-code a swap entry */ 431deae26bfSKyle McMartin 432deae26bfSKyle McMartin #define __swp_type(x) ((x).val & 0x1f) 433deae26bfSKyle McMartin #define __swp_offset(x) ( (((x).val >> 6) & 0x7) | \ 434deae26bfSKyle McMartin (((x).val >> 8) & ~0x7) ) 435deae26bfSKyle McMartin #define __swp_entry(type, offset) ((swp_entry_t) { (type) | \ 436deae26bfSKyle McMartin ((offset & 0x7) << 6) | \ 437deae26bfSKyle McMartin ((offset & ~0x7) << 8) }) 438deae26bfSKyle McMartin #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 439deae26bfSKyle McMartin #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 440deae26bfSKyle McMartin 441deae26bfSKyle McMartin static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) 442deae26bfSKyle McMartin { 443bda079d3SJohn David Anglin pte_t pte; 444bda079d3SJohn David Anglin unsigned long flags; 445bda079d3SJohn David Anglin 446deae26bfSKyle McMartin if (!pte_young(*ptep)) 447deae26bfSKyle McMartin return 0; 448deae26bfSKyle McMartin 449bda079d3SJohn David Anglin spin_lock_irqsave(&pa_dbit_lock, flags); 450bda079d3SJohn David Anglin pte = *ptep; 451bda079d3SJohn David Anglin if (!pte_young(pte)) { 452bda079d3SJohn David Anglin spin_unlock_irqrestore(&pa_dbit_lock, flags); 453bda079d3SJohn David Anglin return 0; 454bda079d3SJohn David Anglin } 455bda079d3SJohn David Anglin set_pte(ptep, pte_mkold(pte)); 456bda079d3SJohn David Anglin purge_tlb_entries(vma->vm_mm, addr); 457bda079d3SJohn David Anglin spin_unlock_irqrestore(&pa_dbit_lock, flags); 458bda079d3SJohn David Anglin return 1; 459bda079d3SJohn David Anglin } 460deae26bfSKyle McMartin 461deae26bfSKyle McMartin struct mm_struct; 462deae26bfSKyle McMartin static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 463deae26bfSKyle McMartin { 464deae26bfSKyle McMartin pte_t old_pte; 465bda079d3SJohn David Anglin unsigned long flags; 466deae26bfSKyle McMartin 467bda079d3SJohn David Anglin spin_lock_irqsave(&pa_dbit_lock, flags); 4688b4ae334SJames Bottomley old_pte = *ptep; 4698b4ae334SJames Bottomley pte_clear(mm,addr,ptep); 470bda079d3SJohn David Anglin purge_tlb_entries(mm, addr); 471bda079d3SJohn David Anglin spin_unlock_irqrestore(&pa_dbit_lock, flags); 472deae26bfSKyle McMartin 473deae26bfSKyle McMartin return old_pte; 474deae26bfSKyle McMartin } 475deae26bfSKyle McMartin 476deae26bfSKyle McMartin static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 477deae26bfSKyle McMartin { 478bda079d3SJohn David Anglin unsigned long flags; 479bda079d3SJohn David Anglin spin_lock_irqsave(&pa_dbit_lock, flags); 480bda079d3SJohn David Anglin set_pte(ptep, pte_wrprotect(*ptep)); 4817139bc15SJohn David Anglin purge_tlb_entries(mm, addr); 482bda079d3SJohn David Anglin spin_unlock_irqrestore(&pa_dbit_lock, flags); 483deae26bfSKyle McMartin } 484deae26bfSKyle McMartin 485deae26bfSKyle McMartin #define pte_same(A,B) (pte_val(A) == pte_val(B)) 486deae26bfSKyle McMartin 487deae26bfSKyle McMartin #endif /* !__ASSEMBLY__ */ 488deae26bfSKyle McMartin 489deae26bfSKyle McMartin 490deae26bfSKyle McMartin /* TLB page size encoding - see table 3-1 in parisc20.pdf */ 491deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_4K 0 492deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_16K 1 493deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_64K 2 494deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_256K 3 495deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_1M 4 496deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_4M 5 497deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_16M 6 498deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_64M 7 499deae26bfSKyle McMartin 500deae26bfSKyle McMartin #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 501deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4K 502deae26bfSKyle McMartin #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB) 503deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16K 504deae26bfSKyle McMartin #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB) 505deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_64K 506deae26bfSKyle McMartin #endif 507deae26bfSKyle McMartin 508deae26bfSKyle McMartin 509deae26bfSKyle McMartin #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 510deae26bfSKyle McMartin remap_pfn_range(vma, vaddr, pfn, size, prot) 511deae26bfSKyle McMartin 512deae26bfSKyle McMartin #define pgprot_noncached(prot) __pgprot(pgprot_val(prot) | _PAGE_NO_CACHE) 513deae26bfSKyle McMartin 514deae26bfSKyle McMartin /* We provide our own get_unmapped_area to provide cache coherency */ 515deae26bfSKyle McMartin 516deae26bfSKyle McMartin #define HAVE_ARCH_UNMAPPED_AREA 517deae26bfSKyle McMartin 518deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 519deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 520deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_SET_WRPROTECT 521deae26bfSKyle McMartin #define __HAVE_ARCH_PTE_SAME 522deae26bfSKyle McMartin #include <asm-generic/pgtable.h> 523deae26bfSKyle McMartin 524deae26bfSKyle McMartin #endif /* _PARISC_PGTABLE_H */ 525