351 lines
9.8 KiB
C
351 lines
9.8 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
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* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_PGTABLE_64_H
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#define _ASM_PGTABLE_64_H
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <asm/addrspace.h>
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#include <asm/page.h>
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#include <asm/cachectl.h>
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#include <asm/fixmap.h>
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#if CONFIG_PGTABLE_LEVELS == 2
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#include <asm-generic/pgtable-nopmd.h>
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#elif CONFIG_PGTABLE_LEVELS == 3
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#include <asm-generic/pgtable-nopud.h>
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#else
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#include <asm-generic/pgtable-nop4d.h>
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#endif
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/*
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* Each address space has 2 4K pages as its page directory, giving 1024
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* (== PTRS_PER_PGD) 8 byte pointers to pmd tables. Each pmd table is a
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* single 4K page, giving 512 (== PTRS_PER_PMD) 8 byte pointers to page
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* tables. Each page table is also a single 4K page, giving 512 (==
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* PTRS_PER_PTE) 8 byte ptes. Each pud entry is initialized to point to
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* invalid_pmd_table, each pmd entry is initialized to point to
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* invalid_pte_table, each pte is initialized to 0.
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*
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* Kernel mappings: kernel mappings are held in the swapper_pg_table.
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* The layout is identical to userspace except it's indexed with the
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* fault address - VMALLOC_START.
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*/
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/* PGDIR_SHIFT determines what a third-level page table entry can map */
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#ifdef __PAGETABLE_PMD_FOLDED
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#define PGDIR_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
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#else
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/* PMD_SHIFT determines the size of the area a second-level page table can map */
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#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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# ifdef __PAGETABLE_PUD_FOLDED
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# define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_TABLE_ORDER - 3))
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# endif
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_TABLE_ORDER - 3))
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#define PUD_SIZE (1UL << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE-1))
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#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_TABLE_ORDER - 3))
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#endif
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/*
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* For 4kB page size we use a 3 level page tree and an 8kB pud, which
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* permits us mapping 40 bits of virtual address space.
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*
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* We used to implement 41 bits by having an order 1 pmd level but that seemed
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* rather pointless.
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*
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* For 8kB page size we use a 3 level page tree which permits a total of
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* 8TB of address space. Alternatively a 33-bit / 8GB organization using
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* two levels would be easy to implement.
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*
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* For 16kB page size we use a 2 level page tree which permits a total of
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* 36 bits of virtual address space. We could add a third level but it seems
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* like at the moment there's no need for this.
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*
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* For 64kB page size we use a 2 level page table tree for a total of 42 bits
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* of virtual address space.
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*/
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#ifdef CONFIG_PAGE_SIZE_4KB
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# ifdef CONFIG_MIPS_VA_BITS_48
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# define PGD_TABLE_ORDER 0
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# define PUD_TABLE_ORDER 0
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# else
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# define PGD_TABLE_ORDER 1
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# define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
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# endif
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#define PMD_TABLE_ORDER 0
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#endif
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#ifdef CONFIG_PAGE_SIZE_8KB
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#define PGD_TABLE_ORDER 0
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#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
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#define PMD_TABLE_ORDER 0
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#endif
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#ifdef CONFIG_PAGE_SIZE_16KB
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#ifdef CONFIG_MIPS_VA_BITS_48
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#define PGD_TABLE_ORDER 1
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#else
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#define PGD_TABLE_ORDER 0
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#endif
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#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
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#define PMD_TABLE_ORDER 0
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#endif
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#ifdef CONFIG_PAGE_SIZE_32KB
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#define PGD_TABLE_ORDER 0
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#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
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#define PMD_TABLE_ORDER 0
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#endif
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#ifdef CONFIG_PAGE_SIZE_64KB
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#define PGD_TABLE_ORDER 0
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#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
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#ifdef CONFIG_MIPS_VA_BITS_48
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#define PMD_TABLE_ORDER 0
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#else
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#define PMD_TABLE_ORDER aieeee_attempt_to_allocate_pmd
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#endif
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#endif
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#define PTRS_PER_PGD ((PAGE_SIZE << PGD_TABLE_ORDER) / sizeof(pgd_t))
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#ifndef __PAGETABLE_PUD_FOLDED
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#define PTRS_PER_PUD ((PAGE_SIZE << PUD_TABLE_ORDER) / sizeof(pud_t))
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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#define PTRS_PER_PMD ((PAGE_SIZE << PMD_TABLE_ORDER) / sizeof(pmd_t))
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#endif
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#define PTRS_PER_PTE (PAGE_SIZE / sizeof(pte_t))
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#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
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/*
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* TLB refill handlers also map the vmalloc area into xuseg. Avoid
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* the first couple of pages so NULL pointer dereferences will still
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* reliably trap.
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*/
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#define VMALLOC_START (MAP_BASE + (2 * PAGE_SIZE))
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#define VMALLOC_END \
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(MAP_BASE + \
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min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \
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(1UL << cpu_vmbits)) - (1UL << 32))
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#if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \
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VMALLOC_START != CKSSEG
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/* Load modules into 32bit-compatible segment. */
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#define MODULE_START CKSSEG
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#define MODULE_END (FIXADDR_START-2*PAGE_SIZE)
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#endif
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
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#ifndef __PAGETABLE_PMD_FOLDED
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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#define pud_ERROR(e) \
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printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
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#endif
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
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extern pte_t invalid_pte_table[PTRS_PER_PTE];
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#ifndef __PAGETABLE_PUD_FOLDED
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/*
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* For 4-level pagetables we defines these ourselves, for 3-level the
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* definitions are below, for 2-level the
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* definitions are supplied by <asm-generic/pgtable-nopmd.h>.
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*/
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typedef struct { unsigned long pud; } pud_t;
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#define pud_val(x) ((x).pud)
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#define __pud(x) ((pud_t) { (x) })
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extern pud_t invalid_pud_table[PTRS_PER_PUD];
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/*
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* Empty pgd entries point to the invalid_pud_table.
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*/
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static inline int p4d_none(p4d_t p4d)
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{
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return p4d_val(p4d) == (unsigned long)invalid_pud_table;
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}
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static inline int p4d_bad(p4d_t p4d)
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{
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if (unlikely(p4d_val(p4d) & ~PAGE_MASK))
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return 1;
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return 0;
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}
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static inline int p4d_present(p4d_t p4d)
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{
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return p4d_val(p4d) != (unsigned long)invalid_pud_table;
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}
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static inline void p4d_clear(p4d_t *p4dp)
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{
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p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
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}
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static inline pud_t *p4d_pgtable(p4d_t p4d)
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{
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return (pud_t *)p4d_val(p4d);
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}
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#define p4d_phys(p4d) virt_to_phys((void *)p4d_val(p4d))
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#define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
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#define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
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static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
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{
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*p4d = p4dval;
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}
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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/*
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* For 3-level pagetables we defines these ourselves, for 2-level the
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* definitions are supplied by <asm-generic/pgtable-nopmd.h>.
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*/
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typedef struct { unsigned long pmd; } pmd_t;
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#define pmd_val(x) ((x).pmd)
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#define __pmd(x) ((pmd_t) { (x) } )
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extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
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#endif
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/*
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* Empty pgd/pmd entries point to the invalid_pte_table.
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*/
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static inline int pmd_none(pmd_t pmd)
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{
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return pmd_val(pmd) == (unsigned long) invalid_pte_table;
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}
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static inline int pmd_bad(pmd_t pmd)
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{
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#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
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/* pmd_huge(pmd) but inline */
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if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
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return 0;
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#endif
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if (unlikely(pmd_val(pmd) & ~PAGE_MASK))
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return 1;
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return 0;
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}
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static inline int pmd_present(pmd_t pmd)
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{
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#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
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if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
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return pmd_val(pmd) & _PAGE_PRESENT;
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#endif
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return pmd_val(pmd) != (unsigned long) invalid_pte_table;
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
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}
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#ifndef __PAGETABLE_PMD_FOLDED
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/*
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* Empty pud entries point to the invalid_pmd_table.
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*/
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static inline int pud_none(pud_t pud)
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{
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return pud_val(pud) == (unsigned long) invalid_pmd_table;
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}
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static inline int pud_bad(pud_t pud)
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{
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return pud_val(pud) & ~PAGE_MASK;
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}
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static inline int pud_present(pud_t pud)
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{
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return pud_val(pud) != (unsigned long) invalid_pmd_table;
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}
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static inline void pud_clear(pud_t *pudp)
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{
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pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
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}
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#endif
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pte_pfn(x) ((unsigned long)((x).pte >> _PFN_SHIFT))
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#define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
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#define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
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#ifndef __PAGETABLE_PMD_FOLDED
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static inline pmd_t *pud_pgtable(pud_t pud)
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{
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return (pmd_t *)pud_val(pud);
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}
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#define pud_phys(pud) virt_to_phys((void *)pud_val(pud))
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#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
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#endif
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/*
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* Initialize a new pgd / pud / pmd table with invalid pointers.
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*/
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extern void pgd_init(void *addr);
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extern void pud_init(void *addr);
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extern void pmd_init(void *addr);
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/*
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* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
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* are !pte_none() && !pte_present().
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*
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* Format of swap PTEs:
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*
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* 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3
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* 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2
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* <--------------------------- offset ---------------------------
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*
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* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* --------------> E <-- type ---> <---------- zeroes ----------->
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*
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* E is the exclusive marker that is not stored in swap entries.
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*/
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static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
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{ pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; }
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#define __swp_type(x) (((x).val >> 16) & 0x7f)
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#define __swp_offset(x) ((x).val >> 24)
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#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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/* We borrow bit 23 to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE (1 << 23)
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#endif /* _ASM_PGTABLE_64_H */
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