Viewing file:  pgtable.h (3.57 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* linux/include/asm-arm/proc-armo/pgtable.h
*
* Copyright (C) 1995-2001 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.
*
* 18-Oct-1997 RMK Now two-level (32x32)
*/
#ifndef __ASM_PROC_PGTABLE_H
#define __ASM_PROC_PGTABLE_H
/*
* entries per page directory level: they are two-level, so
* we don't really have any PMD directory.
*/
#define PTRS_PER_PTE 32
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD 32
/*
* The vmalloc() routines leaves a hole of 4kB between each vmalloced
* area for the same reason. ;)
*/
#define VMALLOC_START 0x01a00000
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
#define VMALLOC_END 0x01c00000
#define _PAGE_TABLE (0x01)
#define pmd_bad(pmd) ((pmd_val(pmd) & 0xfc000002))
#define set_pmd(pmdp,pmd) ((*(pmdp)) = (pmd))
static inline pmd_t __mk_pmd(pte_t *ptep, unsigned long prot)
{
unsigned long pte_ptr = (unsigned long)ptep;
pmd_t pmd;
pmd_val(pmd) = __virt_to_phys(pte_ptr) | prot;
return pmd;
}
static inline unsigned long pmd_page(pmd_t pmd)
{
return __phys_to_virt(pmd_val(pmd) & ~_PAGE_TABLE);
}
#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
#define _PAGE_PRESENT 0x01
#define _PAGE_READONLY 0x02
#define _PAGE_NOT_USER 0x04
#define _PAGE_OLD 0x08
#define _PAGE_CLEAN 0x10
/* -- present -- -- !dirty -- --- !write --- ---- !user --- */
#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY | _PAGE_NOT_USER)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CLEAN )
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY )
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY )
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_NOT_USER)
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_OLD | _PAGE_CLEAN)
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
#define pte_read(pte) (!(pte_val(pte) & _PAGE_NOT_USER))
#define pte_write(pte) (!(pte_val(pte) & _PAGE_READONLY))
#define pte_exec(pte) (!(pte_val(pte) & _PAGE_NOT_USER))
#define pte_dirty(pte) (!(pte_val(pte) & _PAGE_CLEAN))
#define pte_young(pte) (!(pte_val(pte) & _PAGE_OLD))
static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_READONLY; return pte; }
static inline pte_t pte_rdprotect(pte_t pte) { pte_val(pte) |= _PAGE_NOT_USER; return pte; }
static inline pte_t pte_exprotect(pte_t pte) { pte_val(pte) |= _PAGE_NOT_USER; return pte; }
static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) |= _PAGE_CLEAN; return pte; }
static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) |= _PAGE_OLD; return pte; }
static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_READONLY; return pte; }
static inline pte_t pte_mkread(pte_t pte) { pte_val(pte) &= ~_PAGE_NOT_USER; return pte; }
static inline pte_t pte_mkexec(pte_t pte) { pte_val(pte) &= ~_PAGE_NOT_USER; return pte; }
static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) &= ~_PAGE_CLEAN; return pte; }
static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) &= ~_PAGE_OLD; return pte; }
#define pte_alloc_kernel pte_alloc
/*
* We don't store cache state bits in the page table here.
*/
#define pgprot_noncached(prot) (prot)
#endif /* __ASM_PROC_PGTABLE_H */
|