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/*
* linux/include/asm-arm/proc-armv/pgtable.h
*
* Copyright (C) 1995-1999 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 12-Jan-1997 RMK Altered flushing routines to use function pointers
* now possible to combine ARM6, ARM7 and StrongARM versions.
* 17-Apr-1999 RMK Now pass an area size to clean_cache_area and
* flush_icache_area.
*/
#ifndef __ASM_PROC_PGTABLE_H
#define __ASM_PROC_PGTABLE_H
#include <asm/proc/domain.h>
#include <asm/arch/vmalloc.h>
/*
* entries per page directory level: they are two-level, so
* we don't really have any PMD directory.
*/
#define PTRS_PER_PTE 256
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD 4096
/****************
* PMD functions *
****************/
/* PMD types (actually level 1 descriptor) */
#define PMD_TYPE_MASK 0x0003
#define PMD_TYPE_FAULT 0x0000
#define PMD_TYPE_TABLE 0x0001
#define PMD_TYPE_SECT 0x0002
#define PMD_UPDATABLE 0x0010
#define PMD_SECT_CACHEABLE 0x0008
#define PMD_SECT_BUFFERABLE 0x0004
#define PMD_SECT_AP_WRITE 0x0400
#define PMD_SECT_AP_READ 0x0800
#define PMD_DOMAIN(x) ((x) << 5)
#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_USER))
#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_KERNEL))
#define pmd_bad(pmd) (pmd_val(pmd) & 2)
#define set_pmd(pmdp,pmd) cpu_set_pmd(pmdp,pmd)
extern __inline__ pmd_t __mk_pmd(pte_t *ptep, unsigned long prot)
{
unsigned long pte_ptr = (unsigned long)ptep;
pmd_t pmd;
pte_ptr -= PTRS_PER_PTE * sizeof(void *);
/*
* The pmd must be loaded with the physical
* address of the PTE table
*/
pmd_val(pmd) = __virt_to_phys(pte_ptr) | prot;
return pmd;
}
/* these are aliases for the above function */
#define mk_user_pmd(ptep) __mk_pmd(ptep, _PAGE_USER_TABLE)
#define mk_kernel_pmd(ptep) __mk_pmd(ptep, _PAGE_KERNEL_TABLE)
extern __inline__ unsigned long pmd_page(pmd_t pmd)
{
unsigned long ptr;
ptr = pmd_val(pmd) & ~(PTRS_PER_PTE * sizeof(void *) - 1);
ptr += PTRS_PER_PTE * sizeof(void *);
return __phys_to_virt(ptr);
}
/****************
* PTE functions *
****************/
/* PTE types (actually level 2 descriptor) */
#define PTE_TYPE_MASK 0x0003
#define PTE_TYPE_FAULT 0x0000
#define PTE_TYPE_LARGE 0x0001
#define PTE_TYPE_SMALL 0x0002
#define PTE_AP_READ 0x0aa0
#define PTE_AP_WRITE 0x0550
#define PTE_CACHEABLE 0x0008
#define PTE_BUFFERABLE 0x0004
#define set_pte(ptep, pte) cpu_set_pte(ptep,pte)
/* We now keep two sets of ptes - the physical and the linux version.
* This gives us many advantages, and allows us greater flexibility.
*
* The Linux pte's contain:
* bit meaning
* 0 page present
* 1 young
* 2 bufferable - matches physical pte
* 3 cacheable - matches physical pte
* 4 user
* 5 write
* 6 execute
* 7 dirty
* 8-11 unused
* 12-31 virtual page address
*
* These are stored at the pte pointer; the physical PTE is at -1024bytes
*/
#define L_PTE_PRESENT (1 << 0)
#define L_PTE_YOUNG (1 << 1)
#define L_PTE_BUFFERABLE (1 << 2)
#define L_PTE_CACHEABLE (1 << 3)
#define L_PTE_USER (1 << 4)
#define L_PTE_WRITE (1 << 5)
#define L_PTE_EXEC (1 << 6)
#define L_PTE_DIRTY (1 << 7)
/*
* The following macros handle the cache and bufferable bits...
*/
#define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG
#define _L_PTE_READ L_PTE_USER | L_PTE_CACHEABLE | L_PTE_BUFFERABLE
#define PAGE_NONE __pgprot(_L_PTE_DEFAULT)
#define PAGE_COPY __pgprot(_L_PTE_DEFAULT | _L_PTE_READ)
#define PAGE_SHARED __pgprot(_L_PTE_DEFAULT | _L_PTE_READ | L_PTE_WRITE)
#define PAGE_READONLY __pgprot(_L_PTE_DEFAULT | _L_PTE_READ)
#define PAGE_KERNEL __pgprot(_L_PTE_DEFAULT | L_PTE_CACHEABLE | L_PTE_BUFFERABLE | L_PTE_DIRTY | L_PTE_WRITE)
#define _PAGE_CHG_MASK (PAGE_MASK | L_PTE_DIRTY | L_PTE_YOUNG)
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
#define pte_present(pte) (pte_val(pte) & L_PTE_PRESENT)
#define pte_read(pte) (pte_val(pte) & L_PTE_USER)
#define pte_write(pte) (pte_val(pte) & L_PTE_WRITE)
#define pte_exec(pte) (pte_val(pte) & L_PTE_EXEC)
#define pte_dirty(pte) (pte_val(pte) & L_PTE_DIRTY)
#define pte_young(pte) (pte_val(pte) & L_PTE_YOUNG)
#define PTE_BIT_FUNC(fn,op) \
extern inline pte_t pte_##fn##(pte_t pte) { pte_val(pte) op##; return pte; }
/*PTE_BIT_FUNC(rdprotect, &= ~L_PTE_USER);*/
/*PTE_BIT_FUNC(mkread, |= L_PTE_USER);*/
PTE_BIT_FUNC(wrprotect, &= ~L_PTE_WRITE);
PTE_BIT_FUNC(mkwrite, |= L_PTE_WRITE);
PTE_BIT_FUNC(exprotect, &= ~L_PTE_EXEC);
PTE_BIT_FUNC(mkexec, |= L_PTE_EXEC);
PTE_BIT_FUNC(mkclean, &= ~L_PTE_DIRTY);
PTE_BIT_FUNC(mkdirty, |= L_PTE_DIRTY);
PTE_BIT_FUNC(mkold, &= ~L_PTE_YOUNG);
PTE_BIT_FUNC(mkyoung, |= L_PTE_YOUNG);
PTE_BIT_FUNC(nocache, &= ~L_PTE_CACHEABLE);
#endif /* __ASM_PROC_PGTABLE_H */
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