463 lines
13 KiB
C
463 lines
13 KiB
C
/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */
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#ifndef _SPARC_PGTABLE_H
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#define _SPARC_PGTABLE_H
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/* asm-sparc/pgtable.h: Defines and functions used to work
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* with Sparc page tables.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <asm-generic/4level-fixup.h>
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#include <linux/config.h>
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#include <linux/spinlock.h>
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#include <linux/swap.h>
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#include <asm/types.h>
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#ifdef CONFIG_SUN4
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#include <asm/pgtsun4.h>
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#else
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#include <asm/pgtsun4c.h>
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#endif
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#include <asm/pgtsrmmu.h>
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#include <asm/vac-ops.h>
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#include <asm/oplib.h>
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#include <asm/btfixup.h>
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#include <asm/system.h>
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#ifndef __ASSEMBLY__
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struct vm_area_struct;
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struct page;
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extern void load_mmu(void);
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extern unsigned long calc_highpages(void);
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BTFIXUPDEF_SIMM13(pgdir_shift)
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BTFIXUPDEF_SETHI(pgdir_size)
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BTFIXUPDEF_SETHI(pgdir_mask)
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BTFIXUPDEF_SIMM13(ptrs_per_pmd)
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BTFIXUPDEF_SIMM13(ptrs_per_pgd)
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BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
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#define pte_ERROR(e) __builtin_trap()
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#define pmd_ERROR(e) __builtin_trap()
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#define pgd_ERROR(e) __builtin_trap()
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BTFIXUPDEF_INT(page_none)
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BTFIXUPDEF_INT(page_shared)
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BTFIXUPDEF_INT(page_copy)
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BTFIXUPDEF_INT(page_readonly)
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BTFIXUPDEF_INT(page_kernel)
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#define PMD_SHIFT SUN4C_PMD_SHIFT
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
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#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
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#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
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#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
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#define PTRS_PER_PTE 1024
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#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
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#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
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#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
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#define FIRST_USER_ADDRESS 0
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#define PTE_SIZE (PTRS_PER_PTE*4)
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#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
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#define PAGE_SHARED __pgprot(BTFIXUP_INT(page_shared))
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#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
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#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
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extern unsigned long page_kernel;
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#ifdef MODULE
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#define PAGE_KERNEL page_kernel
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#else
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#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
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#endif
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/* Top-level page directory */
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extern pgd_t swapper_pg_dir[1024];
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extern void paging_init(void);
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/* Page table for 0-4MB for everybody, on the Sparc this
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* holds the same as on the i386.
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*/
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extern pte_t pg0[1024];
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extern pte_t pg1[1024];
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extern pte_t pg2[1024];
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extern pte_t pg3[1024];
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extern unsigned long ptr_in_current_pgd;
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/* Here is a trick, since mmap.c need the initializer elements for
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* protection_map[] to be constant at compile time, I set the following
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* to all zeros. I set it to the real values after I link in the
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* appropriate MMU page table routines at boot time.
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*/
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#define __P000 __pgprot(0)
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#define __P001 __pgprot(0)
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#define __P010 __pgprot(0)
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#define __P011 __pgprot(0)
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#define __P100 __pgprot(0)
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#define __P101 __pgprot(0)
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#define __P110 __pgprot(0)
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#define __P111 __pgprot(0)
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#define __S000 __pgprot(0)
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#define __S001 __pgprot(0)
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#define __S010 __pgprot(0)
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#define __S011 __pgprot(0)
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#define __S100 __pgprot(0)
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#define __S101 __pgprot(0)
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#define __S110 __pgprot(0)
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#define __S111 __pgprot(0)
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extern int num_contexts;
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/* First physical page can be anywhere, the following is needed so that
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* va-->pa and vice versa conversions work properly without performance
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* hit for all __pa()/__va() operations.
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*/
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extern unsigned long phys_base;
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extern unsigned long pfn_base;
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/*
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* BAD_PAGETABLE is used when we need a bogus page-table, while
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* BAD_PAGE is used for a bogus page.
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*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern pte_t * __bad_pagetable(void);
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extern pte_t __bad_page(void);
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extern unsigned long empty_zero_page;
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#define BAD_PAGETABLE __bad_pagetable()
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#define BAD_PAGE __bad_page()
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#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
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/*
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*/
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BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
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BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page, pgd_t)
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#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
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#define pgd_page(pgd) BTFIXUP_CALL(pgd_page)(pgd)
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BTFIXUPDEF_SETHI(none_mask)
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BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
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BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
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BTFIXUPDEF_CALL(int, pte_read, pte_t)
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static inline int pte_none(pte_t pte)
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{
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return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
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}
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#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
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#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
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#define pte_read(pte) BTFIXUP_CALL(pte_read)(pte)
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BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
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BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
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BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
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static inline int pmd_none(pmd_t pmd)
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{
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return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
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}
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#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
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#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
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#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
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BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
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BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
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BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
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BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
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#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
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#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
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#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
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#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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BTFIXUPDEF_HALF(pte_writei)
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BTFIXUPDEF_HALF(pte_dirtyi)
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BTFIXUPDEF_HALF(pte_youngi)
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static int pte_write(pte_t pte) __attribute_const__;
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static inline int pte_write(pte_t pte)
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{
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return pte_val(pte) & BTFIXUP_HALF(pte_writei);
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}
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static int pte_dirty(pte_t pte) __attribute_const__;
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static inline int pte_dirty(pte_t pte)
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{
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return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
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}
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static int pte_young(pte_t pte) __attribute_const__;
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static inline int pte_young(pte_t pte)
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{
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return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
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}
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/*
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* The following only work if pte_present() is not true.
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*/
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BTFIXUPDEF_HALF(pte_filei)
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static int pte_file(pte_t pte) __attribute_const__;
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static inline int pte_file(pte_t pte)
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{
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return pte_val(pte) & BTFIXUP_HALF(pte_filei);
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}
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/*
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*/
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BTFIXUPDEF_HALF(pte_wrprotecti)
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BTFIXUPDEF_HALF(pte_mkcleani)
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BTFIXUPDEF_HALF(pte_mkoldi)
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static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
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}
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static pte_t pte_mkclean(pte_t pte) __attribute_const__;
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static inline pte_t pte_mkclean(pte_t pte)
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{
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return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
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}
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static pte_t pte_mkold(pte_t pte) __attribute_const__;
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static inline pte_t pte_mkold(pte_t pte)
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{
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return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
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}
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BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
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BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
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BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
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#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
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#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
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#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
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#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
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BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
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#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
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#define pte_page(pte) pfn_to_page(pte_pfn(pte))
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
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BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
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BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
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#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
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#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
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#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
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BTFIXUPDEF_INT(pte_modify_mask)
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static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
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pgprot_val(newprot));
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}
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#define pgd_index(address) ((address) >> PGDIR_SHIFT)
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/* to find an entry in a page-table-directory */
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#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
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/* to find an entry in a kernel page-table-directory */
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#define pgd_offset_k(address) pgd_offset(&init_mm, address)
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/* Find an entry in the second-level page table.. */
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BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
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#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
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/* Find an entry in the third-level page table.. */
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BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
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#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
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/*
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* This shortcut works on sun4m (and sun4d) because the nocache area is static,
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* and sun4c is guaranteed to have no highmem anyway.
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*/
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#define pte_offset_map(d, a) pte_offset_kernel(d,a)
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#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
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#define pte_unmap(pte) do{}while(0)
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#define pte_unmap_nested(pte) do{}while(0)
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/* The permissions for pgprot_val to make a page mapped on the obio space */
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extern unsigned int pg_iobits;
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/* Certain architectures need to do special things when pte's
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* within a page table are directly modified. Thus, the following
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* hook is made available.
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*/
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BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
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#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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struct seq_file;
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BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
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#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
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/* Fault handler stuff... */
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#define FAULT_CODE_PROT 0x1
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#define FAULT_CODE_WRITE 0x2
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#define FAULT_CODE_USER 0x4
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BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
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#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
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BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
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unsigned long, unsigned int)
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BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
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#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
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#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
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extern int invalid_segment;
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/* Encode and de-code a swap entry */
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BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
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BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
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BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
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#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
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#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
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#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
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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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/* file-offset-in-pte helpers */
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BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
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BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
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#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
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#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
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/*
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* This is made a constant because mm/fremap.c required a constant.
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* Note that layout of these bits is different between sun4c.c and srmmu.c.
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*/
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#define PTE_FILE_MAX_BITS 24
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/*
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*/
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struct ctx_list {
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struct ctx_list *next;
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struct ctx_list *prev;
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unsigned int ctx_number;
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struct mm_struct *ctx_mm;
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};
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extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
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extern struct ctx_list ctx_free; /* Head of free list */
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extern struct ctx_list ctx_used; /* Head of used contexts list */
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#define NO_CONTEXT -1
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static inline void remove_from_ctx_list(struct ctx_list *entry)
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{
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entry->next->prev = entry->prev;
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entry->prev->next = entry->next;
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}
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static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
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{
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entry->next = head;
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(entry->prev = head->prev)->next = entry;
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head->prev = entry;
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}
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#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
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#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
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static inline unsigned long
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__get_phys (unsigned long addr)
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{
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switch (sparc_cpu_model){
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case sun4:
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case sun4c:
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return sun4c_get_pte (addr) << PAGE_SHIFT;
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case sun4m:
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case sun4d:
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return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
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default:
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return 0;
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}
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}
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static inline int
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__get_iospace (unsigned long addr)
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{
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switch (sparc_cpu_model){
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case sun4:
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case sun4c:
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return -1; /* Don't check iospace on sun4c */
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case sun4m:
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case sun4d:
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return (srmmu_get_pte (addr) >> 28);
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default:
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return -1;
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}
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}
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extern unsigned long *sparc_valid_addr_bitmap;
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/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
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#define kern_addr_valid(addr) \
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(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
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extern int io_remap_pfn_range(struct vm_area_struct *vma,
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unsigned long from, unsigned long pfn,
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unsigned long size, pgprot_t prot);
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/*
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* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
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* its high 4 bits. These macros/functions put it there or get it from there.
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*/
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#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
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#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
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#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
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#include <asm-generic/pgtable.h>
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#endif /* !(__ASSEMBLY__) */
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/* We provide our own get_unmapped_area to cope with VA holes for userland */
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#define HAVE_ARCH_UNMAPPED_AREA
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/*
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* No page table caches to initialise
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*/
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#define pgtable_cache_init() do { } while (0)
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#endif /* !(_SPARC_PGTABLE_H) */
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