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 1901ab6057SJohn David Anglin extern spinlock_t pa_tlb_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 3601ab6057SJohn David Anglin /* Purge data and instruction TLB entries. Must be called holding 3701ab6057SJohn David Anglin * the pa_tlb_lock. The TLB purge instructions are slow on SMP 3801ab6057SJohn David Anglin * machines since the purge must be broadcast to all CPUs. 3901ab6057SJohn David Anglin */ 4001ab6057SJohn David Anglin 4101ab6057SJohn David Anglin static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr) 4201ab6057SJohn David Anglin { 4301ab6057SJohn David Anglin mtsp(mm->context, 1); 4401ab6057SJohn David Anglin pdtlb(addr); 4501ab6057SJohn David Anglin if (unlikely(split_tlb)) 4601ab6057SJohn David Anglin pitlb(addr); 4701ab6057SJohn David Anglin } 4801ab6057SJohn David Anglin 49deae26bfSKyle McMartin /* Certain architectures need to do special things when PTEs 50deae26bfSKyle McMartin * within a page table are directly modified. Thus, the following 51deae26bfSKyle McMartin * hook is made available. 52deae26bfSKyle McMartin */ 53deae26bfSKyle McMartin #define set_pte(pteptr, pteval) \ 54deae26bfSKyle McMartin do{ \ 55deae26bfSKyle McMartin *(pteptr) = (pteval); \ 56deae26bfSKyle McMartin } while(0) 577139bc15SJohn David Anglin 5801ab6057SJohn David Anglin #define pte_inserted(x) \ 5901ab6057SJohn David Anglin ((pte_val(x) & (_PAGE_PRESENT|_PAGE_ACCESSED)) \ 6001ab6057SJohn David Anglin == (_PAGE_PRESENT|_PAGE_ACCESSED)) 617139bc15SJohn David Anglin 627139bc15SJohn David Anglin #define set_pte_at(mm, addr, ptep, pteval) \ 637139bc15SJohn David Anglin do { \ 6401ab6057SJohn David Anglin pte_t old_pte; \ 65bda079d3SJohn David Anglin unsigned long flags; \ 6601ab6057SJohn David Anglin spin_lock_irqsave(&pa_tlb_lock, flags); \ 6701ab6057SJohn David Anglin old_pte = *ptep; \ 687139bc15SJohn David Anglin set_pte(ptep, pteval); \ 6901ab6057SJohn David Anglin if (pte_inserted(old_pte)) \ 707139bc15SJohn David Anglin purge_tlb_entries(mm, addr); \ 7101ab6057SJohn David Anglin spin_unlock_irqrestore(&pa_tlb_lock, flags); \ 727139bc15SJohn David Anglin } while (0) 73deae26bfSKyle McMartin 74deae26bfSKyle McMartin #endif /* !__ASSEMBLY__ */ 75deae26bfSKyle McMartin 769b05b1ecSRolf Eike Beer #include <asm/page.h> 779b05b1ecSRolf Eike Beer 78deae26bfSKyle McMartin #define pte_ERROR(e) \ 79deae26bfSKyle McMartin printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 80deae26bfSKyle McMartin #define pmd_ERROR(e) \ 81deae26bfSKyle McMartin printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, (unsigned long)pmd_val(e)) 82deae26bfSKyle McMartin #define pgd_ERROR(e) \ 83deae26bfSKyle McMartin printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e)) 84deae26bfSKyle McMartin 85deae26bfSKyle McMartin /* This is the size of the initially mapped kernel memory */ 86332b42e4SHelge Deller #ifdef CONFIG_64BIT 87332b42e4SHelge Deller #define KERNEL_INITIAL_ORDER 25 /* 1<<25 = 32MB */ 88332b42e4SHelge Deller #else 89332b42e4SHelge Deller #define KERNEL_INITIAL_ORDER 24 /* 1<<24 = 16MB */ 90332b42e4SHelge Deller #endif 91deae26bfSKyle McMartin #define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER) 92deae26bfSKyle McMartin 93f24ffde4SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS == 3 94deae26bfSKyle McMartin #define PGD_ORDER 1 /* Number of pages per pgd */ 95deae26bfSKyle McMartin #define PMD_ORDER 1 /* Number of pages per pmd */ 96deae26bfSKyle McMartin #define PGD_ALLOC_ORDER 2 /* first pgd contains pmd */ 97deae26bfSKyle McMartin #else 98deae26bfSKyle McMartin #define PGD_ORDER 1 /* Number of pages per pgd */ 99deae26bfSKyle McMartin #define PGD_ALLOC_ORDER PGD_ORDER 100deae26bfSKyle McMartin #endif 101deae26bfSKyle McMartin 102deae26bfSKyle McMartin /* Definitions for 3rd level (we use PLD here for Page Lower directory 103deae26bfSKyle McMartin * because PTE_SHIFT is used lower down to mean shift that has to be 104deae26bfSKyle McMartin * done to get usable bits out of the PTE) */ 105deae26bfSKyle McMartin #define PLD_SHIFT PAGE_SHIFT 106deae26bfSKyle McMartin #define PLD_SIZE PAGE_SIZE 107deae26bfSKyle McMartin #define BITS_PER_PTE (PAGE_SHIFT - BITS_PER_PTE_ENTRY) 108deae26bfSKyle McMartin #define PTRS_PER_PTE (1UL << BITS_PER_PTE) 109deae26bfSKyle McMartin 110deae26bfSKyle McMartin /* Definitions for 2nd level */ 111deae26bfSKyle McMartin #define pgtable_cache_init() do { } while (0) 112deae26bfSKyle McMartin 113deae26bfSKyle McMartin #define PMD_SHIFT (PLD_SHIFT + BITS_PER_PTE) 114deae26bfSKyle McMartin #define PMD_SIZE (1UL << PMD_SHIFT) 115deae26bfSKyle McMartin #define PMD_MASK (~(PMD_SIZE-1)) 116f24ffde4SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS == 3 117deae26bfSKyle McMartin #define BITS_PER_PMD (PAGE_SHIFT + PMD_ORDER - BITS_PER_PMD_ENTRY) 118deae26bfSKyle McMartin #else 119c07af4f1SKirill A. Shutemov #define __PAGETABLE_PMD_FOLDED 120deae26bfSKyle McMartin #define BITS_PER_PMD 0 121deae26bfSKyle McMartin #endif 122deae26bfSKyle McMartin #define PTRS_PER_PMD (1UL << BITS_PER_PMD) 123deae26bfSKyle McMartin 124deae26bfSKyle McMartin /* Definitions for 1st level */ 125deae26bfSKyle McMartin #define PGDIR_SHIFT (PMD_SHIFT + BITS_PER_PMD) 12648d27cb2SHelge Deller #if (PGDIR_SHIFT + PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) > BITS_PER_LONG 12748d27cb2SHelge Deller #define BITS_PER_PGD (BITS_PER_LONG - PGDIR_SHIFT) 12848d27cb2SHelge Deller #else 129deae26bfSKyle McMartin #define BITS_PER_PGD (PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) 13048d27cb2SHelge Deller #endif 131deae26bfSKyle McMartin #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 132deae26bfSKyle McMartin #define PGDIR_MASK (~(PGDIR_SIZE-1)) 133deae26bfSKyle McMartin #define PTRS_PER_PGD (1UL << BITS_PER_PGD) 134deae26bfSKyle McMartin #define USER_PTRS_PER_PGD PTRS_PER_PGD 135deae26bfSKyle McMartin 13648d27cb2SHelge Deller #ifdef CONFIG_64BIT 137deae26bfSKyle McMartin #define MAX_ADDRBITS (PGDIR_SHIFT + BITS_PER_PGD) 138deae26bfSKyle McMartin #define MAX_ADDRESS (1UL << MAX_ADDRBITS) 139deae26bfSKyle McMartin #define SPACEID_SHIFT (MAX_ADDRBITS - 32) 14048d27cb2SHelge Deller #else 14148d27cb2SHelge Deller #define MAX_ADDRBITS (BITS_PER_LONG) 14248d27cb2SHelge Deller #define MAX_ADDRESS (1UL << MAX_ADDRBITS) 14348d27cb2SHelge Deller #define SPACEID_SHIFT 0 14448d27cb2SHelge Deller #endif 145deae26bfSKyle McMartin 146deae26bfSKyle McMartin /* This calculates the number of initial pages we need for the initial 147deae26bfSKyle McMartin * page tables */ 148deae26bfSKyle McMartin #if (KERNEL_INITIAL_ORDER) >= (PMD_SHIFT) 149deae26bfSKyle McMartin # define PT_INITIAL (1 << (KERNEL_INITIAL_ORDER - PMD_SHIFT)) 150deae26bfSKyle McMartin #else 151deae26bfSKyle McMartin # define PT_INITIAL (1) /* all initial PTEs fit into one page */ 152deae26bfSKyle McMartin #endif 153deae26bfSKyle McMartin 154deae26bfSKyle McMartin /* 155deae26bfSKyle McMartin * pgd entries used up by user/kernel: 156deae26bfSKyle McMartin */ 157deae26bfSKyle McMartin 158d016bf7eSKirill A. Shutemov #define FIRST_USER_ADDRESS 0UL 159deae26bfSKyle McMartin 160deae26bfSKyle McMartin /* NB: The tlb miss handlers make certain assumptions about the order */ 161deae26bfSKyle McMartin /* of the following bits, so be careful (One example, bits 25-31 */ 162deae26bfSKyle McMartin /* are moved together in one instruction). */ 163deae26bfSKyle McMartin 164deae26bfSKyle McMartin #define _PAGE_READ_BIT 31 /* (0x001) read access allowed */ 165deae26bfSKyle McMartin #define _PAGE_WRITE_BIT 30 /* (0x002) write access allowed */ 166deae26bfSKyle McMartin #define _PAGE_EXEC_BIT 29 /* (0x004) execute access allowed */ 167deae26bfSKyle McMartin #define _PAGE_GATEWAY_BIT 28 /* (0x008) privilege promotion allowed */ 168deae26bfSKyle McMartin #define _PAGE_DMB_BIT 27 /* (0x010) Data Memory Break enable (B bit) */ 169deae26bfSKyle McMartin #define _PAGE_DIRTY_BIT 26 /* (0x020) Page Dirty (D bit) */ 170deae26bfSKyle McMartin #define _PAGE_REFTRAP_BIT 25 /* (0x040) Page Ref. Trap enable (T bit) */ 171deae26bfSKyle McMartin #define _PAGE_NO_CACHE_BIT 24 /* (0x080) Uncached Page (U bit) */ 172deae26bfSKyle McMartin #define _PAGE_ACCESSED_BIT 23 /* (0x100) Software: Page Accessed */ 173deae26bfSKyle McMartin #define _PAGE_PRESENT_BIT 22 /* (0x200) Software: translation valid */ 1741f25ad26SHelge Deller #define _PAGE_HPAGE_BIT 21 /* (0x400) Software: Huge Page */ 175deae26bfSKyle McMartin #define _PAGE_USER_BIT 20 /* (0x800) Software: User accessible page */ 176deae26bfSKyle McMartin 177deae26bfSKyle McMartin /* N.B. The bits are defined in terms of a 32 bit word above, so the */ 178deae26bfSKyle McMartin /* following macro is ok for both 32 and 64 bit. */ 179deae26bfSKyle McMartin 180deae26bfSKyle McMartin #define xlate_pabit(x) (31 - x) 181deae26bfSKyle McMartin 182deae26bfSKyle McMartin /* this defines the shift to the usable bits in the PTE it is set so 183deae26bfSKyle McMartin * that the valid bits _PAGE_PRESENT_BIT and _PAGE_USER_BIT are set 184deae26bfSKyle McMartin * to zero */ 185deae26bfSKyle McMartin #define PTE_SHIFT xlate_pabit(_PAGE_USER_BIT) 186deae26bfSKyle McMartin 187deae26bfSKyle McMartin /* PFN_PTE_SHIFT defines the shift of a PTE value to access the PFN field */ 188deae26bfSKyle McMartin #define PFN_PTE_SHIFT 12 189deae26bfSKyle McMartin 190deae26bfSKyle McMartin #define _PAGE_READ (1 << xlate_pabit(_PAGE_READ_BIT)) 191deae26bfSKyle McMartin #define _PAGE_WRITE (1 << xlate_pabit(_PAGE_WRITE_BIT)) 192deae26bfSKyle McMartin #define _PAGE_RW (_PAGE_READ | _PAGE_WRITE) 193deae26bfSKyle McMartin #define _PAGE_EXEC (1 << xlate_pabit(_PAGE_EXEC_BIT)) 194deae26bfSKyle McMartin #define _PAGE_GATEWAY (1 << xlate_pabit(_PAGE_GATEWAY_BIT)) 195deae26bfSKyle McMartin #define _PAGE_DMB (1 << xlate_pabit(_PAGE_DMB_BIT)) 196deae26bfSKyle McMartin #define _PAGE_DIRTY (1 << xlate_pabit(_PAGE_DIRTY_BIT)) 197deae26bfSKyle McMartin #define _PAGE_REFTRAP (1 << xlate_pabit(_PAGE_REFTRAP_BIT)) 198deae26bfSKyle McMartin #define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT)) 199deae26bfSKyle McMartin #define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT)) 200deae26bfSKyle McMartin #define _PAGE_PRESENT (1 << xlate_pabit(_PAGE_PRESENT_BIT)) 2011f25ad26SHelge Deller #define _PAGE_HUGE (1 << xlate_pabit(_PAGE_HPAGE_BIT)) 202deae26bfSKyle McMartin #define _PAGE_USER (1 << xlate_pabit(_PAGE_USER_BIT)) 203deae26bfSKyle McMartin 204deae26bfSKyle McMartin #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED) 205deae26bfSKyle McMartin #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) 206d7dd2ff1SJames Bottomley #define _PAGE_KERNEL_RO (_PAGE_PRESENT | _PAGE_READ | _PAGE_DIRTY | _PAGE_ACCESSED) 207d7dd2ff1SJames Bottomley #define _PAGE_KERNEL_EXEC (_PAGE_KERNEL_RO | _PAGE_EXEC) 208d7dd2ff1SJames Bottomley #define _PAGE_KERNEL_RWX (_PAGE_KERNEL_EXEC | _PAGE_WRITE) 209d7dd2ff1SJames Bottomley #define _PAGE_KERNEL (_PAGE_KERNEL_RO | _PAGE_WRITE) 210deae26bfSKyle McMartin 211deae26bfSKyle McMartin /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds 212deae26bfSKyle McMartin * are page-aligned, we don't care about the PAGE_OFFSET bits, except 213deae26bfSKyle McMartin * for a few meta-information bits, so we shift the address to be 214deae26bfSKyle McMartin * able to effectively address 40/42/44-bits of physical address space 215deae26bfSKyle McMartin * depending on 4k/16k/64k PAGE_SIZE */ 216deae26bfSKyle McMartin #define _PxD_PRESENT_BIT 31 217deae26bfSKyle McMartin #define _PxD_ATTACHED_BIT 30 218deae26bfSKyle McMartin #define _PxD_VALID_BIT 29 219deae26bfSKyle McMartin 220deae26bfSKyle McMartin #define PxD_FLAG_PRESENT (1 << xlate_pabit(_PxD_PRESENT_BIT)) 221deae26bfSKyle McMartin #define PxD_FLAG_ATTACHED (1 << xlate_pabit(_PxD_ATTACHED_BIT)) 222deae26bfSKyle McMartin #define PxD_FLAG_VALID (1 << xlate_pabit(_PxD_VALID_BIT)) 223deae26bfSKyle McMartin #define PxD_FLAG_MASK (0xf) 224deae26bfSKyle McMartin #define PxD_FLAG_SHIFT (4) 2251f25ad26SHelge Deller #define PxD_VALUE_SHIFT (PFN_PTE_SHIFT-PxD_FLAG_SHIFT) 226deae26bfSKyle McMartin 227deae26bfSKyle McMartin #ifndef __ASSEMBLY__ 228deae26bfSKyle McMartin 229deae26bfSKyle McMartin #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) 230deae26bfSKyle McMartin #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_ACCESSED) 231deae26bfSKyle McMartin /* Others seem to make this executable, I don't know if that's correct 232deae26bfSKyle McMartin or not. The stack is mapped this way though so this is necessary 233deae26bfSKyle McMartin in the short term - dhd@linuxcare.com, 2000-08-08 */ 234deae26bfSKyle McMartin #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_ACCESSED) 235deae26bfSKyle McMartin #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE | _PAGE_ACCESSED) 236deae26bfSKyle McMartin #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC |_PAGE_ACCESSED) 237deae26bfSKyle McMartin #define PAGE_COPY PAGE_EXECREAD 238deae26bfSKyle McMartin #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC |_PAGE_ACCESSED) 239deae26bfSKyle McMartin #define PAGE_KERNEL __pgprot(_PAGE_KERNEL) 240d7dd2ff1SJames Bottomley #define PAGE_KERNEL_EXEC __pgprot(_PAGE_KERNEL_EXEC) 241d7dd2ff1SJames Bottomley #define PAGE_KERNEL_RWX __pgprot(_PAGE_KERNEL_RWX) 242d7dd2ff1SJames Bottomley #define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL_RO) 243deae26bfSKyle McMartin #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE) 244deae26bfSKyle McMartin #define PAGE_GATEWAY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ) 245deae26bfSKyle McMartin 246deae26bfSKyle McMartin 247deae26bfSKyle McMartin /* 248deae26bfSKyle McMartin * We could have an execute only page using "gateway - promote to priv 249deae26bfSKyle McMartin * level 3", but that is kind of silly. So, the way things are defined 250deae26bfSKyle McMartin * now, we must always have read permission for pages with execute 251deae26bfSKyle McMartin * permission. For the fun of it we'll go ahead and support write only 252deae26bfSKyle McMartin * pages. 253deae26bfSKyle McMartin */ 254deae26bfSKyle McMartin 255deae26bfSKyle McMartin /*xwr*/ 256deae26bfSKyle McMartin #define __P000 PAGE_NONE 257deae26bfSKyle McMartin #define __P001 PAGE_READONLY 258deae26bfSKyle McMartin #define __P010 __P000 /* copy on write */ 259deae26bfSKyle McMartin #define __P011 __P001 /* copy on write */ 260deae26bfSKyle McMartin #define __P100 PAGE_EXECREAD 261deae26bfSKyle McMartin #define __P101 PAGE_EXECREAD 262deae26bfSKyle McMartin #define __P110 __P100 /* copy on write */ 263deae26bfSKyle McMartin #define __P111 __P101 /* copy on write */ 264deae26bfSKyle McMartin 265deae26bfSKyle McMartin #define __S000 PAGE_NONE 266deae26bfSKyle McMartin #define __S001 PAGE_READONLY 267deae26bfSKyle McMartin #define __S010 PAGE_WRITEONLY 268deae26bfSKyle McMartin #define __S011 PAGE_SHARED 269deae26bfSKyle McMartin #define __S100 PAGE_EXECREAD 270deae26bfSKyle McMartin #define __S101 PAGE_EXECREAD 271deae26bfSKyle McMartin #define __S110 PAGE_RWX 272deae26bfSKyle McMartin #define __S111 PAGE_RWX 273deae26bfSKyle McMartin 274deae26bfSKyle McMartin 275deae26bfSKyle McMartin extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */ 276deae26bfSKyle McMartin 277deae26bfSKyle McMartin /* initial page tables for 0-8MB for kernel */ 278deae26bfSKyle McMartin 279deae26bfSKyle McMartin extern pte_t pg0[]; 280deae26bfSKyle McMartin 281deae26bfSKyle McMartin /* zero page used for uninitialized stuff */ 282deae26bfSKyle McMartin 283deae26bfSKyle McMartin extern unsigned long *empty_zero_page; 284deae26bfSKyle McMartin 285deae26bfSKyle McMartin /* 286deae26bfSKyle McMartin * ZERO_PAGE is a global shared page that is always zero: used 287deae26bfSKyle McMartin * for zero-mapped memory areas etc.. 288deae26bfSKyle McMartin */ 289deae26bfSKyle McMartin 290deae26bfSKyle McMartin #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 291deae26bfSKyle McMartin 2928b4ae334SJames Bottomley #define pte_none(x) (pte_val(x) == 0) 293deae26bfSKyle McMartin #define pte_present(x) (pte_val(x) & _PAGE_PRESENT) 29401ab6057SJohn David Anglin #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0)) 295deae26bfSKyle McMartin 296deae26bfSKyle McMartin #define pmd_flag(x) (pmd_val(x) & PxD_FLAG_MASK) 297deae26bfSKyle McMartin #define pmd_address(x) ((unsigned long)(pmd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 298deae26bfSKyle McMartin #define pgd_flag(x) (pgd_val(x) & PxD_FLAG_MASK) 299deae26bfSKyle McMartin #define pgd_address(x) ((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 300deae26bfSKyle McMartin 301f24ffde4SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS == 3 302deae26bfSKyle McMartin /* The first entry of the permanent pmd is not there if it contains 303deae26bfSKyle McMartin * the gateway marker */ 304deae26bfSKyle McMartin #define pmd_none(x) (!pmd_val(x) || pmd_flag(x) == PxD_FLAG_ATTACHED) 305deae26bfSKyle McMartin #else 306deae26bfSKyle McMartin #define pmd_none(x) (!pmd_val(x)) 307deae26bfSKyle McMartin #endif 308deae26bfSKyle McMartin #define pmd_bad(x) (!(pmd_flag(x) & PxD_FLAG_VALID)) 309deae26bfSKyle McMartin #define pmd_present(x) (pmd_flag(x) & PxD_FLAG_PRESENT) 310deae26bfSKyle McMartin static inline void pmd_clear(pmd_t *pmd) { 311f24ffde4SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS == 3 312deae26bfSKyle McMartin if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) 313deae26bfSKyle McMartin /* This is the entry pointing to the permanent pmd 314deae26bfSKyle McMartin * attached to the pgd; cannot clear it */ 315deae26bfSKyle McMartin __pmd_val_set(*pmd, PxD_FLAG_ATTACHED); 316deae26bfSKyle McMartin else 317deae26bfSKyle McMartin #endif 318deae26bfSKyle McMartin __pmd_val_set(*pmd, 0); 319deae26bfSKyle McMartin } 320deae26bfSKyle McMartin 321deae26bfSKyle McMartin 322deae26bfSKyle McMartin 323f24ffde4SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS == 3 324deae26bfSKyle McMartin #define pgd_page_vaddr(pgd) ((unsigned long) __va(pgd_address(pgd))) 325deae26bfSKyle McMartin #define pgd_page(pgd) virt_to_page((void *)pgd_page_vaddr(pgd)) 326deae26bfSKyle McMartin 327deae26bfSKyle McMartin /* For 64 bit we have three level tables */ 328deae26bfSKyle McMartin 329deae26bfSKyle McMartin #define pgd_none(x) (!pgd_val(x)) 330deae26bfSKyle McMartin #define pgd_bad(x) (!(pgd_flag(x) & PxD_FLAG_VALID)) 331deae26bfSKyle McMartin #define pgd_present(x) (pgd_flag(x) & PxD_FLAG_PRESENT) 332deae26bfSKyle McMartin static inline void pgd_clear(pgd_t *pgd) { 333f24ffde4SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS == 3 334deae26bfSKyle McMartin if(pgd_flag(*pgd) & PxD_FLAG_ATTACHED) 335deae26bfSKyle McMartin /* This is the permanent pmd attached to the pgd; cannot 336deae26bfSKyle McMartin * free it */ 337deae26bfSKyle McMartin return; 338deae26bfSKyle McMartin #endif 339deae26bfSKyle McMartin __pgd_val_set(*pgd, 0); 340deae26bfSKyle McMartin } 341deae26bfSKyle McMartin #else 342deae26bfSKyle McMartin /* 343deae26bfSKyle McMartin * The "pgd_xxx()" functions here are trivial for a folded two-level 344deae26bfSKyle McMartin * setup: the pgd is never bad, and a pmd always exists (as it's folded 345deae26bfSKyle McMartin * into the pgd entry) 346deae26bfSKyle McMartin */ 347deae26bfSKyle McMartin static inline int pgd_none(pgd_t pgd) { return 0; } 348deae26bfSKyle McMartin static inline int pgd_bad(pgd_t pgd) { return 0; } 349deae26bfSKyle McMartin static inline int pgd_present(pgd_t pgd) { return 1; } 350deae26bfSKyle McMartin static inline void pgd_clear(pgd_t * pgdp) { } 351deae26bfSKyle McMartin #endif 352deae26bfSKyle McMartin 353deae26bfSKyle McMartin /* 354deae26bfSKyle McMartin * The following only work if pte_present() is true. 355deae26bfSKyle McMartin * Undefined behaviour if not.. 356deae26bfSKyle McMartin */ 357deae26bfSKyle McMartin static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 358deae26bfSKyle McMartin static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 359deae26bfSKyle McMartin static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 360deae26bfSKyle McMartin static inline int pte_special(pte_t pte) { return 0; } 361deae26bfSKyle McMartin 362deae26bfSKyle McMartin static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } 363deae26bfSKyle McMartin static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 364deae26bfSKyle McMartin static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; return pte; } 365deae26bfSKyle McMartin static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } 366deae26bfSKyle McMartin static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } 367deae26bfSKyle McMartin static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; } 368deae26bfSKyle McMartin static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 369deae26bfSKyle McMartin 370deae26bfSKyle McMartin /* 3711f25ad26SHelge Deller * Huge pte definitions. 3721f25ad26SHelge Deller */ 3731f25ad26SHelge Deller #ifdef CONFIG_HUGETLB_PAGE 3741f25ad26SHelge Deller #define pte_huge(pte) (pte_val(pte) & _PAGE_HUGE) 3751f25ad26SHelge Deller #define pte_mkhuge(pte) (__pte(pte_val(pte) | _PAGE_HUGE)) 3761f25ad26SHelge Deller #else 3771f25ad26SHelge Deller #define pte_huge(pte) (0) 3781f25ad26SHelge Deller #define pte_mkhuge(pte) (pte) 3791f25ad26SHelge Deller #endif 3801f25ad26SHelge Deller 3811f25ad26SHelge Deller 3821f25ad26SHelge Deller /* 383deae26bfSKyle McMartin * Conversion functions: convert a page and protection to a page entry, 384deae26bfSKyle McMartin * and a page entry and page directory to the page they refer to. 385deae26bfSKyle McMartin */ 386deae26bfSKyle McMartin #define __mk_pte(addr,pgprot) \ 387deae26bfSKyle McMartin ({ \ 388deae26bfSKyle McMartin pte_t __pte; \ 389deae26bfSKyle McMartin \ 390deae26bfSKyle McMartin pte_val(__pte) = ((((addr)>>PAGE_SHIFT)<<PFN_PTE_SHIFT) + pgprot_val(pgprot)); \ 391deae26bfSKyle McMartin \ 392deae26bfSKyle McMartin __pte; \ 393deae26bfSKyle McMartin }) 394deae26bfSKyle McMartin 395deae26bfSKyle McMartin #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 396deae26bfSKyle McMartin 397deae26bfSKyle McMartin static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) 398deae26bfSKyle McMartin { 399deae26bfSKyle McMartin pte_t pte; 400deae26bfSKyle McMartin pte_val(pte) = (pfn << PFN_PTE_SHIFT) | pgprot_val(pgprot); 401deae26bfSKyle McMartin return pte; 402deae26bfSKyle McMartin } 403deae26bfSKyle McMartin 404deae26bfSKyle McMartin static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 405deae26bfSKyle McMartin { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } 406deae26bfSKyle McMartin 407deae26bfSKyle McMartin /* Permanent address of a page. On parisc we don't have highmem. */ 408deae26bfSKyle McMartin 409deae26bfSKyle McMartin #define pte_pfn(x) (pte_val(x) >> PFN_PTE_SHIFT) 410deae26bfSKyle McMartin 411deae26bfSKyle McMartin #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 412deae26bfSKyle McMartin 413deae26bfSKyle McMartin #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_address(pmd))) 414deae26bfSKyle McMartin 415deae26bfSKyle McMartin #define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd))) 416deae26bfSKyle McMartin #define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd)) 417deae26bfSKyle McMartin 418deae26bfSKyle McMartin #define pgd_index(address) ((address) >> PGDIR_SHIFT) 419deae26bfSKyle McMartin 420deae26bfSKyle McMartin /* to find an entry in a page-table-directory */ 421deae26bfSKyle McMartin #define pgd_offset(mm, address) \ 422deae26bfSKyle McMartin ((mm)->pgd + ((address) >> PGDIR_SHIFT)) 423deae26bfSKyle McMartin 424deae26bfSKyle McMartin /* to find an entry in a kernel page-table-directory */ 425deae26bfSKyle McMartin #define pgd_offset_k(address) pgd_offset(&init_mm, address) 426deae26bfSKyle McMartin 427deae26bfSKyle McMartin /* Find an entry in the second-level page table.. */ 428deae26bfSKyle McMartin 429f24ffde4SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS == 3 4301f25ad26SHelge Deller #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 431deae26bfSKyle McMartin #define pmd_offset(dir,address) \ 4321f25ad26SHelge Deller ((pmd_t *) pgd_page_vaddr(*(dir)) + pmd_index(address)) 433deae26bfSKyle McMartin #else 434deae26bfSKyle McMartin #define pmd_offset(dir,addr) ((pmd_t *) dir) 435deae26bfSKyle McMartin #endif 436deae26bfSKyle McMartin 437deae26bfSKyle McMartin /* Find an entry in the third-level page table.. */ 438deae26bfSKyle McMartin #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) 439deae26bfSKyle McMartin #define pte_offset_kernel(pmd, address) \ 440deae26bfSKyle McMartin ((pte_t *) pmd_page_vaddr(*(pmd)) + pte_index(address)) 441deae26bfSKyle McMartin #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) 442deae26bfSKyle McMartin #define pte_unmap(pte) do { } while (0) 443deae26bfSKyle McMartin 444deae26bfSKyle McMartin #define pte_unmap(pte) do { } while (0) 445deae26bfSKyle McMartin #define pte_unmap_nested(pte) do { } while (0) 446deae26bfSKyle McMartin 447deae26bfSKyle McMartin extern void paging_init (void); 448deae26bfSKyle McMartin 449deae26bfSKyle McMartin /* Used for deferring calls to flush_dcache_page() */ 450deae26bfSKyle McMartin 451deae26bfSKyle McMartin #define PG_dcache_dirty PG_arch_1 452deae26bfSKyle McMartin 4534b3073e1SRussell King extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *); 454deae26bfSKyle McMartin 455deae26bfSKyle McMartin /* Encode and de-code a swap entry */ 456deae26bfSKyle McMartin 457deae26bfSKyle McMartin #define __swp_type(x) ((x).val & 0x1f) 458deae26bfSKyle McMartin #define __swp_offset(x) ( (((x).val >> 6) & 0x7) | \ 459deae26bfSKyle McMartin (((x).val >> 8) & ~0x7) ) 460deae26bfSKyle McMartin #define __swp_entry(type, offset) ((swp_entry_t) { (type) | \ 461deae26bfSKyle McMartin ((offset & 0x7) << 6) | \ 462deae26bfSKyle McMartin ((offset & ~0x7) << 8) }) 463deae26bfSKyle McMartin #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 464deae26bfSKyle McMartin #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 465deae26bfSKyle McMartin 466deae26bfSKyle McMartin static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) 467deae26bfSKyle McMartin { 468bda079d3SJohn David Anglin pte_t pte; 469bda079d3SJohn David Anglin unsigned long flags; 470bda079d3SJohn David Anglin 471deae26bfSKyle McMartin if (!pte_young(*ptep)) 472deae26bfSKyle McMartin return 0; 473deae26bfSKyle McMartin 47401ab6057SJohn David Anglin spin_lock_irqsave(&pa_tlb_lock, flags); 475bda079d3SJohn David Anglin pte = *ptep; 476bda079d3SJohn David Anglin if (!pte_young(pte)) { 47701ab6057SJohn David Anglin spin_unlock_irqrestore(&pa_tlb_lock, flags); 478bda079d3SJohn David Anglin return 0; 479bda079d3SJohn David Anglin } 480bda079d3SJohn David Anglin set_pte(ptep, pte_mkold(pte)); 481bda079d3SJohn David Anglin purge_tlb_entries(vma->vm_mm, addr); 48201ab6057SJohn David Anglin spin_unlock_irqrestore(&pa_tlb_lock, flags); 483bda079d3SJohn David Anglin return 1; 484bda079d3SJohn David Anglin } 485deae26bfSKyle McMartin 486deae26bfSKyle McMartin struct mm_struct; 487deae26bfSKyle McMartin static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 488deae26bfSKyle McMartin { 489deae26bfSKyle McMartin pte_t old_pte; 490bda079d3SJohn David Anglin unsigned long flags; 491deae26bfSKyle McMartin 49201ab6057SJohn David Anglin spin_lock_irqsave(&pa_tlb_lock, flags); 4938b4ae334SJames Bottomley old_pte = *ptep; 49401ab6057SJohn David Anglin set_pte(ptep, __pte(0)); 49501ab6057SJohn David Anglin if (pte_inserted(old_pte)) 496bda079d3SJohn David Anglin purge_tlb_entries(mm, addr); 49701ab6057SJohn David Anglin spin_unlock_irqrestore(&pa_tlb_lock, flags); 498deae26bfSKyle McMartin 499deae26bfSKyle McMartin return old_pte; 500deae26bfSKyle McMartin } 501deae26bfSKyle McMartin 502deae26bfSKyle McMartin static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 503deae26bfSKyle McMartin { 504bda079d3SJohn David Anglin unsigned long flags; 50501ab6057SJohn David Anglin spin_lock_irqsave(&pa_tlb_lock, flags); 506bda079d3SJohn David Anglin set_pte(ptep, pte_wrprotect(*ptep)); 5077139bc15SJohn David Anglin purge_tlb_entries(mm, addr); 50801ab6057SJohn David Anglin spin_unlock_irqrestore(&pa_tlb_lock, flags); 509deae26bfSKyle McMartin } 510deae26bfSKyle McMartin 511deae26bfSKyle McMartin #define pte_same(A,B) (pte_val(A) == pte_val(B)) 512deae26bfSKyle McMartin 513deae26bfSKyle McMartin #endif /* !__ASSEMBLY__ */ 514deae26bfSKyle McMartin 515deae26bfSKyle McMartin 516deae26bfSKyle McMartin /* TLB page size encoding - see table 3-1 in parisc20.pdf */ 517deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_4K 0 518deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_16K 1 519deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_64K 2 520deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_256K 3 521deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_1M 4 522deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_4M 5 523deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_16M 6 524deae26bfSKyle McMartin #define _PAGE_SIZE_ENCODING_64M 7 525deae26bfSKyle McMartin 526deae26bfSKyle McMartin #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 527deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4K 528deae26bfSKyle McMartin #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB) 529deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16K 530deae26bfSKyle McMartin #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB) 531deae26bfSKyle McMartin # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_64K 532deae26bfSKyle McMartin #endif 533deae26bfSKyle McMartin 534deae26bfSKyle McMartin 535deae26bfSKyle McMartin #define pgprot_noncached(prot) __pgprot(pgprot_val(prot) | _PAGE_NO_CACHE) 536deae26bfSKyle McMartin 537deae26bfSKyle McMartin /* We provide our own get_unmapped_area to provide cache coherency */ 538deae26bfSKyle McMartin 539deae26bfSKyle McMartin #define HAVE_ARCH_UNMAPPED_AREA 5409dabf60dSHelge Deller #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 541deae26bfSKyle McMartin 542deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 543deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 544deae26bfSKyle McMartin #define __HAVE_ARCH_PTEP_SET_WRPROTECT 545deae26bfSKyle McMartin #define __HAVE_ARCH_PTE_SAME 546deae26bfSKyle McMartin #include <asm-generic/pgtable.h> 547deae26bfSKyle McMartin 548deae26bfSKyle McMartin #endif /* _PARISC_PGTABLE_H */ 549