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| -rw-r--r-- | arch/ia64/include/asm/pgtable.h | 597 |
1 files changed, 597 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h new file mode 100644 index 000000000..165827774 --- /dev/null +++ b/arch/ia64/include/asm/pgtable.h @@ -0,0 +1,597 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_IA64_PGTABLE_H +#define _ASM_IA64_PGTABLE_H + +/* + * This file contains the functions and defines necessary to modify and use + * the IA-64 page table tree. + * + * This hopefully works with any (fixed) IA-64 page-size, as defined + * in <asm/page.h>. + * + * Copyright (C) 1998-2005 Hewlett-Packard Co + * David Mosberger-Tang <davidm@hpl.hp.com> + */ + + +#include <asm/mman.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/types.h> + +#define IA64_MAX_PHYS_BITS 50 /* max. number of physical address bits (architected) */ + +/* + * First, define the various bits in a PTE. Note that the PTE format + * matches the VHPT short format, the firt doubleword of the VHPD long + * format, and the first doubleword of the TLB insertion format. + */ +#define _PAGE_P_BIT 0 +#define _PAGE_A_BIT 5 +#define _PAGE_D_BIT 6 + +#define _PAGE_P (1 << _PAGE_P_BIT) /* page present bit */ +#define _PAGE_MA_WB (0x0 << 2) /* write back memory attribute */ +#define _PAGE_MA_UC (0x4 << 2) /* uncacheable memory attribute */ +#define _PAGE_MA_UCE (0x5 << 2) /* UC exported attribute */ +#define _PAGE_MA_WC (0x6 << 2) /* write coalescing memory attribute */ +#define _PAGE_MA_NAT (0x7 << 2) /* not-a-thing attribute */ +#define _PAGE_MA_MASK (0x7 << 2) +#define _PAGE_PL_0 (0 << 7) /* privilege level 0 (kernel) */ +#define _PAGE_PL_1 (1 << 7) /* privilege level 1 (unused) */ +#define _PAGE_PL_2 (2 << 7) /* privilege level 2 (unused) */ +#define _PAGE_PL_3 (3 << 7) /* privilege level 3 (user) */ +#define _PAGE_PL_MASK (3 << 7) +#define _PAGE_AR_R (0 << 9) /* read only */ +#define _PAGE_AR_RX (1 << 9) /* read & execute */ +#define _PAGE_AR_RW (2 << 9) /* read & write */ +#define _PAGE_AR_RWX (3 << 9) /* read, write & execute */ +#define _PAGE_AR_R_RW (4 << 9) /* read / read & write */ +#define _PAGE_AR_RX_RWX (5 << 9) /* read & exec / read, write & exec */ +#define _PAGE_AR_RWX_RW (6 << 9) /* read, write & exec / read & write */ +#define _PAGE_AR_X_RX (7 << 9) /* exec & promote / read & exec */ +#define _PAGE_AR_MASK (7 << 9) +#define _PAGE_AR_SHIFT 9 +#define _PAGE_A (1 << _PAGE_A_BIT) /* page accessed bit */ +#define _PAGE_D (1 << _PAGE_D_BIT) /* page dirty bit */ +#define _PAGE_PPN_MASK (((__IA64_UL(1) << IA64_MAX_PHYS_BITS) - 1) & ~0xfffUL) +#define _PAGE_ED (__IA64_UL(1) << 52) /* exception deferral */ +#define _PAGE_PROTNONE (__IA64_UL(1) << 63) + +#define _PFN_MASK _PAGE_PPN_MASK +/* Mask of bits which may be changed by pte_modify(); the odd bits are there for _PAGE_PROTNONE */ +#define _PAGE_CHG_MASK (_PAGE_P | _PAGE_PROTNONE | _PAGE_PL_MASK | _PAGE_AR_MASK | _PAGE_ED) + +#define _PAGE_SIZE_4K 12 +#define _PAGE_SIZE_8K 13 +#define _PAGE_SIZE_16K 14 +#define _PAGE_SIZE_64K 16 +#define _PAGE_SIZE_256K 18 +#define _PAGE_SIZE_1M 20 +#define _PAGE_SIZE_4M 22 +#define _PAGE_SIZE_16M 24 +#define _PAGE_SIZE_64M 26 +#define _PAGE_SIZE_256M 28 +#define _PAGE_SIZE_1G 30 +#define _PAGE_SIZE_4G 32 + +#define __ACCESS_BITS _PAGE_ED | _PAGE_A | _PAGE_P | _PAGE_MA_WB +#define __DIRTY_BITS_NO_ED _PAGE_A | _PAGE_P | _PAGE_D | _PAGE_MA_WB +#define __DIRTY_BITS _PAGE_ED | __DIRTY_BITS_NO_ED + +/* + * How many pointers will a page table level hold expressed in shift + */ +#define PTRS_PER_PTD_SHIFT (PAGE_SHIFT-3) + +/* + * Definitions for fourth level: + */ +#define PTRS_PER_PTE (__IA64_UL(1) << (PTRS_PER_PTD_SHIFT)) + +/* + * Definitions for third level: + * + * PMD_SHIFT determines the size of the area a third-level page table + * can map. + */ +#define PMD_SHIFT (PAGE_SHIFT + (PTRS_PER_PTD_SHIFT)) +#define PMD_SIZE (1UL << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE-1)) +#define PTRS_PER_PMD (1UL << (PTRS_PER_PTD_SHIFT)) + +#if CONFIG_PGTABLE_LEVELS == 4 +/* + * Definitions for second level: + * + * PUD_SHIFT determines the size of the area a second-level page table + * can map. + */ +#define PUD_SHIFT (PMD_SHIFT + (PTRS_PER_PTD_SHIFT)) +#define PUD_SIZE (1UL << PUD_SHIFT) +#define PUD_MASK (~(PUD_SIZE-1)) +#define PTRS_PER_PUD (1UL << (PTRS_PER_PTD_SHIFT)) +#endif + +/* + * Definitions for first level: + * + * PGDIR_SHIFT determines what a first-level page table entry can map. + */ +#if CONFIG_PGTABLE_LEVELS == 4 +#define PGDIR_SHIFT (PUD_SHIFT + (PTRS_PER_PTD_SHIFT)) +#else +#define PGDIR_SHIFT (PMD_SHIFT + (PTRS_PER_PTD_SHIFT)) +#endif +#define PGDIR_SIZE (__IA64_UL(1) << PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE-1)) +#define PTRS_PER_PGD_SHIFT PTRS_PER_PTD_SHIFT +#define PTRS_PER_PGD (1UL << PTRS_PER_PGD_SHIFT) +#define USER_PTRS_PER_PGD (5*PTRS_PER_PGD/8) /* regions 0-4 are user regions */ +#define FIRST_USER_ADDRESS 0UL + +/* + * All the normal masks have the "page accessed" bits on, as any time + * they are used, the page is accessed. They are cleared only by the + * page-out routines. + */ +#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_A) +#define PAGE_SHARED __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RW) +#define PAGE_READONLY __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_R) +#define PAGE_COPY __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_R) +#define PAGE_COPY_EXEC __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX) +#define PAGE_GATE __pgprot(__ACCESS_BITS | _PAGE_PL_0 | _PAGE_AR_X_RX) +#define PAGE_KERNEL __pgprot(__DIRTY_BITS | _PAGE_PL_0 | _PAGE_AR_RWX) +#define PAGE_KERNELRX __pgprot(__ACCESS_BITS | _PAGE_PL_0 | _PAGE_AR_RX) +#define PAGE_KERNEL_UC __pgprot(__DIRTY_BITS | _PAGE_PL_0 | _PAGE_AR_RWX | \ + _PAGE_MA_UC) + +# ifndef __ASSEMBLY__ + +#include <linux/sched/mm.h> /* for mm_struct */ +#include <linux/bitops.h> +#include <asm/cacheflush.h> +#include <asm/mmu_context.h> + +/* + * Next come the mappings that determine how mmap() protection bits + * (PROT_EXEC, PROT_READ, PROT_WRITE, PROT_NONE) get implemented. The + * _P version gets used for a private shared memory segment, the _S + * version gets used for a shared memory segment with MAP_SHARED on. + * In a private shared memory segment, we do a copy-on-write if a task + * attempts to write to the page. + */ + /* xwr */ +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_READONLY /* write to priv pg -> copy & make writable */ +#define __P011 PAGE_READONLY /* ditto */ +#define __P100 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX) +#define __P101 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX) +#define __P110 PAGE_COPY_EXEC +#define __P111 PAGE_COPY_EXEC + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED /* we don't have (and don't need) write-only */ +#define __S011 PAGE_SHARED +#define __S100 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX) +#define __S101 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX) +#define __S110 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX) +#define __S111 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX) + +#define pgd_ERROR(e) printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) +#if CONFIG_PGTABLE_LEVELS == 4 +#define pud_ERROR(e) printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) +#endif +#define pmd_ERROR(e) printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) +#define pte_ERROR(e) printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) + + +/* + * Some definitions to translate between mem_map, PTEs, and page addresses: + */ + + +/* Quick test to see if ADDR is a (potentially) valid physical address. */ +static inline long +ia64_phys_addr_valid (unsigned long addr) +{ + return (addr & (local_cpu_data->unimpl_pa_mask)) == 0; +} + +/* + * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel + * memory. For the return value to be meaningful, ADDR must be >= + * PAGE_OFFSET. This operation can be relatively expensive (e.g., + * require a hash-, or multi-level tree-lookup or something of that + * sort) but it guarantees to return TRUE only if accessing the page + * at that address does not cause an error. Note that there may be + * addresses for which kern_addr_valid() returns FALSE even though an + * access would not cause an error (e.g., this is typically true for + * memory mapped I/O regions. + * + * XXX Need to implement this for IA-64. + */ +#define kern_addr_valid(addr) (1) + + +/* + * Now come the defines and routines to manage and access the three-level + * page table. + */ + + +#define VMALLOC_START (RGN_BASE(RGN_GATE) + 0x200000000UL) +#ifdef CONFIG_VIRTUAL_MEM_MAP +# define VMALLOC_END_INIT (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 9))) +extern unsigned long VMALLOC_END; +#else +#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_SPARSEMEM_VMEMMAP) +/* SPARSEMEM_VMEMMAP uses half of vmalloc... */ +# define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 10))) +# define vmemmap ((struct page *)VMALLOC_END) +#else +# define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 9))) +#endif +#endif + +/* fs/proc/kcore.c */ +#define kc_vaddr_to_offset(v) ((v) - RGN_BASE(RGN_GATE)) +#define kc_offset_to_vaddr(o) ((o) + RGN_BASE(RGN_GATE)) + +#define RGN_MAP_SHIFT (PGDIR_SHIFT + PTRS_PER_PGD_SHIFT - 3) +#define RGN_MAP_LIMIT ((1UL << RGN_MAP_SHIFT) - PAGE_SIZE) /* per region addr limit */ + +/* + * Conversion functions: convert page frame number (pfn) and a protection value to a page + * table entry (pte). + */ +#define pfn_pte(pfn, pgprot) \ +({ pte_t __pte; pte_val(__pte) = ((pfn) << PAGE_SHIFT) | pgprot_val(pgprot); __pte; }) + +/* Extract pfn from pte. */ +#define pte_pfn(_pte) ((pte_val(_pte) & _PFN_MASK) >> PAGE_SHIFT) + +#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) + +/* This takes a physical page address that is used by the remapping functions */ +#define mk_pte_phys(physpage, pgprot) \ +({ pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); __pte; }) + +#define pte_modify(_pte, newprot) \ + (__pte((pte_val(_pte) & ~_PAGE_CHG_MASK) | (pgprot_val(newprot) & _PAGE_CHG_MASK))) + +#define pte_none(pte) (!pte_val(pte)) +#define pte_present(pte) (pte_val(pte) & (_PAGE_P | _PAGE_PROTNONE)) +#define pte_clear(mm,addr,pte) (pte_val(*(pte)) = 0UL) +/* pte_page() returns the "struct page *" corresponding to the PTE: */ +#define pte_page(pte) virt_to_page(((pte_val(pte) & _PFN_MASK) + PAGE_OFFSET)) + +#define pmd_none(pmd) (!pmd_val(pmd)) +#define pmd_bad(pmd) (!ia64_phys_addr_valid(pmd_val(pmd))) +#define pmd_present(pmd) (pmd_val(pmd) != 0UL) +#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0UL) +#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & _PFN_MASK)) +#define pmd_page(pmd) virt_to_page((pmd_val(pmd) + PAGE_OFFSET)) + +#define pud_none(pud) (!pud_val(pud)) +#define pud_bad(pud) (!ia64_phys_addr_valid(pud_val(pud))) +#define pud_present(pud) (pud_val(pud) != 0UL) +#define pud_clear(pudp) (pud_val(*(pudp)) = 0UL) +#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & _PFN_MASK)) +#define pud_page(pud) virt_to_page((pud_val(pud) + PAGE_OFFSET)) + +#if CONFIG_PGTABLE_LEVELS == 4 +#define pgd_none(pgd) (!pgd_val(pgd)) +#define pgd_bad(pgd) (!ia64_phys_addr_valid(pgd_val(pgd))) +#define pgd_present(pgd) (pgd_val(pgd) != 0UL) +#define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL) +#define pgd_page_vaddr(pgd) ((unsigned long) __va(pgd_val(pgd) & _PFN_MASK)) +#define pgd_page(pgd) virt_to_page((pgd_val(pgd) + PAGE_OFFSET)) +#endif + +/* + * The following have defined behavior only work if pte_present() is true. + */ +#define pte_write(pte) ((unsigned) (((pte_val(pte) & _PAGE_AR_MASK) >> _PAGE_AR_SHIFT) - 2) <= 4) +#define pte_exec(pte) ((pte_val(pte) & _PAGE_AR_RX) != 0) +#define pte_dirty(pte) ((pte_val(pte) & _PAGE_D) != 0) +#define pte_young(pte) ((pte_val(pte) & _PAGE_A) != 0) +#define pte_special(pte) 0 + +/* + * Note: we convert AR_RWX to AR_RX and AR_RW to AR_R by clearing the 2nd bit in the + * access rights: + */ +#define pte_wrprotect(pte) (__pte(pte_val(pte) & ~_PAGE_AR_RW)) +#define pte_mkwrite(pte) (__pte(pte_val(pte) | _PAGE_AR_RW)) +#define pte_mkold(pte) (__pte(pte_val(pte) & ~_PAGE_A)) +#define pte_mkyoung(pte) (__pte(pte_val(pte) | _PAGE_A)) +#define pte_mkclean(pte) (__pte(pte_val(pte) & ~_PAGE_D)) +#define pte_mkdirty(pte) (__pte(pte_val(pte) | _PAGE_D)) +#define pte_mkhuge(pte) (__pte(pte_val(pte))) +#define pte_mkspecial(pte) (pte) + +/* + * Because ia64's Icache and Dcache is not coherent (on a cpu), we need to + * sync icache and dcache when we insert *new* executable page. + * __ia64_sync_icache_dcache() check Pg_arch_1 bit and flush icache + * if necessary. + * + * set_pte() is also called by the kernel, but we can expect that the kernel + * flushes icache explicitly if necessary. + */ +#define pte_present_exec_user(pte)\ + ((pte_val(pte) & (_PAGE_P | _PAGE_PL_MASK | _PAGE_AR_RX)) == \ + (_PAGE_P | _PAGE_PL_3 | _PAGE_AR_RX)) + +extern void __ia64_sync_icache_dcache(pte_t pteval); +static inline void set_pte(pte_t *ptep, pte_t pteval) +{ + /* page is present && page is user && page is executable + * && (page swapin or new page or page migraton + * || copy_on_write with page copying.) + */ + if (pte_present_exec_user(pteval) && + (!pte_present(*ptep) || + pte_pfn(*ptep) != pte_pfn(pteval))) + /* load_module() calles flush_icache_range() explicitly*/ + __ia64_sync_icache_dcache(pteval); + *ptep = pteval; +} + +#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) + +/* + * Make page protection values cacheable, uncacheable, or write- + * combining. Note that "protection" is really a misnomer here as the + * protection value contains the memory attribute bits, dirty bits, and + * various other bits as well. + */ +#define pgprot_cacheable(prot) __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_WB) +#define pgprot_noncached(prot) __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_UC) +#define pgprot_writecombine(prot) __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_WC) + +struct file; +extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot); +#define __HAVE_PHYS_MEM_ACCESS_PROT + +static inline unsigned long +pgd_index (unsigned long address) +{ + unsigned long region = address >> 61; + unsigned long l1index = (address >> PGDIR_SHIFT) & ((PTRS_PER_PGD >> 3) - 1); + + return (region << (PAGE_SHIFT - 6)) | l1index; +} + +/* The offset in the 1-level directory is given by the 3 region bits + (61..63) and the level-1 bits. */ +static inline pgd_t* +pgd_offset (const struct mm_struct *mm, unsigned long address) +{ + return mm->pgd + pgd_index(address); +} + +/* In the kernel's mapped region we completely ignore the region number + (since we know it's in region number 5). */ +#define pgd_offset_k(addr) \ + (init_mm.pgd + (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))) + +/* Look up a pgd entry in the gate area. On IA-64, the gate-area + resides in the kernel-mapped segment, hence we use pgd_offset_k() + here. */ +#define pgd_offset_gate(mm, addr) pgd_offset_k(addr) + +#if CONFIG_PGTABLE_LEVELS == 4 +/* Find an entry in the second-level page table.. */ +#define pud_offset(dir,addr) \ + ((pud_t *) pgd_page_vaddr(*(dir)) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))) +#endif + +/* Find an entry in the third-level page table.. */ +#define pmd_offset(dir,addr) \ + ((pmd_t *) pud_page_vaddr(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))) + +/* + * Find an entry in the third-level page table. This looks more complicated than it + * should be because some platforms place page tables in high memory. + */ +#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_offset_kernel(dir,addr) ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(addr)) +#define pte_offset_map(dir,addr) pte_offset_kernel(dir, addr) +#define pte_unmap(pte) do { } while (0) + +/* atomic versions of the some PTE manipulations: */ + +static inline int +ptep_test_and_clear_young (struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) +{ +#ifdef CONFIG_SMP + if (!pte_young(*ptep)) + return 0; + return test_and_clear_bit(_PAGE_A_BIT, ptep); +#else + pte_t pte = *ptep; + if (!pte_young(pte)) + return 0; + set_pte_at(vma->vm_mm, addr, ptep, pte_mkold(pte)); + return 1; +#endif +} + +static inline pte_t +ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ +#ifdef CONFIG_SMP + return __pte(xchg((long *) ptep, 0)); +#else + pte_t pte = *ptep; + pte_clear(mm, addr, ptep); + return pte; +#endif +} + +static inline void +ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ +#ifdef CONFIG_SMP + unsigned long new, old; + + do { + old = pte_val(*ptep); + new = pte_val(pte_wrprotect(__pte (old))); + } while (cmpxchg((unsigned long *) ptep, old, new) != old); +#else + pte_t old_pte = *ptep; + set_pte_at(mm, addr, ptep, pte_wrprotect(old_pte)); +#endif +} + +static inline int +pte_same (pte_t a, pte_t b) +{ + return pte_val(a) == pte_val(b); +} + +#define update_mmu_cache(vma, address, ptep) do { } while (0) + +extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; +extern void paging_init (void); + +/* + * Note: The macros below rely on the fact that MAX_SWAPFILES_SHIFT <= number of + * bits in the swap-type field of the swap pte. It would be nice to + * enforce that, but we can't easily include <linux/swap.h> here. + * (Of course, better still would be to define MAX_SWAPFILES_SHIFT here...). + * + * Format of swap pte: + * bit 0 : present bit (must be zero) + * bits 1- 7: swap-type + * bits 8-62: swap offset + * bit 63 : _PAGE_PROTNONE bit + */ +#define __swp_type(entry) (((entry).val >> 1) & 0x7f) +#define __swp_offset(entry) (((entry).val << 1) >> 9) +#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 1) | ((long) (offset) << 8) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)]; +extern struct page *zero_page_memmap_ptr; +#define ZERO_PAGE(vaddr) (zero_page_memmap_ptr) + +/* We provide our own get_unmapped_area to cope with VA holes for userland */ +#define HAVE_ARCH_UNMAPPED_AREA + +#ifdef CONFIG_HUGETLB_PAGE +#define HUGETLB_PGDIR_SHIFT (HPAGE_SHIFT + 2*(PAGE_SHIFT-3)) +#define HUGETLB_PGDIR_SIZE (__IA64_UL(1) << HUGETLB_PGDIR_SHIFT) +#define HUGETLB_PGDIR_MASK (~(HUGETLB_PGDIR_SIZE-1)) +#endif + + +#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS +/* + * Update PTEP with ENTRY, which is guaranteed to be a less + * restrictive PTE. That is, ENTRY may have the ACCESSED, DIRTY, and + * WRITABLE bits turned on, when the value at PTEP did not. The + * WRITABLE bit may only be turned if SAFELY_WRITABLE is TRUE. + * + * SAFELY_WRITABLE is TRUE if we can update the value at PTEP without + * having to worry about races. On SMP machines, there are only two + * cases where this is true: + * + * (1) *PTEP has the PRESENT bit turned OFF + * (2) ENTRY has the DIRTY bit turned ON + * + * On ia64, we could implement this routine with a cmpxchg()-loop + * which ORs in the _PAGE_A/_PAGE_D bit if they're set in ENTRY. + * However, like on x86, we can get a more streamlined version by + * observing that it is OK to drop ACCESSED bit updates when + * SAFELY_WRITABLE is FALSE. Besides being rare, all that would do is + * result in an extra Access-bit fault, which would then turn on the + * ACCESSED bit in the low-level fault handler (iaccess_bit or + * daccess_bit in ivt.S). + */ +#ifdef CONFIG_SMP +# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed && __safely_writable) { \ + set_pte(__ptep, __entry); \ + flush_tlb_page(__vma, __addr); \ + } \ + __changed; \ +}) +#else +# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) { \ + set_pte_at((__vma)->vm_mm, (__addr), __ptep, __entry); \ + flush_tlb_page(__vma, __addr); \ + } \ + __changed; \ +}) +#endif + +# ifdef CONFIG_VIRTUAL_MEM_MAP + /* arch mem_map init routine is needed due to holes in a virtual mem_map */ +# define __HAVE_ARCH_MEMMAP_INIT + extern void memmap_init (unsigned long size, int nid, unsigned long zone, + unsigned long start_pfn); +# endif /* CONFIG_VIRTUAL_MEM_MAP */ +# endif /* !__ASSEMBLY__ */ + +/* + * Identity-mapped regions use a large page size. We'll call such large pages + * "granules". If you can think of a better name that's unambiguous, let me + * know... + */ +#if defined(CONFIG_IA64_GRANULE_64MB) +# define IA64_GRANULE_SHIFT _PAGE_SIZE_64M +#elif defined(CONFIG_IA64_GRANULE_16MB) +# define IA64_GRANULE_SHIFT _PAGE_SIZE_16M +#endif +#define IA64_GRANULE_SIZE (1 << IA64_GRANULE_SHIFT) +/* + * log2() of the page size we use to map the kernel image (IA64_TR_KERNEL): + */ +#define KERNEL_TR_PAGE_SHIFT _PAGE_SIZE_64M +#define KERNEL_TR_PAGE_SIZE (1 << KERNEL_TR_PAGE_SHIFT) + +/* + * No page table caches to initialise + */ +#define pgtable_cache_init() do { } while (0) + +/* These tell get_user_pages() that the first gate page is accessible from user-level. */ +#define FIXADDR_USER_START GATE_ADDR +#ifdef HAVE_BUGGY_SEGREL +# define FIXADDR_USER_END (GATE_ADDR + 2*PAGE_SIZE) +#else +# define FIXADDR_USER_END (GATE_ADDR + 2*PERCPU_PAGE_SIZE) +#endif + +#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG +#define __HAVE_ARCH_PTEP_GET_AND_CLEAR +#define __HAVE_ARCH_PTEP_SET_WRPROTECT +#define __HAVE_ARCH_PTE_SAME +#define __HAVE_ARCH_PGD_OFFSET_GATE + + +#if CONFIG_PGTABLE_LEVELS == 3 +#define __ARCH_USE_5LEVEL_HACK +#include <asm-generic/pgtable-nopud.h> +#endif +#include <asm-generic/5level-fixup.h> +#include <asm-generic/pgtable.h> + +#endif /* _ASM_IA64_PGTABLE_H */ |