linux/include/asm-arm/pgalloc.h
Russell King 002547b4f8 [ARM] nommu: adjust headers for !MMU ARM systems
Majorily based on Hyok Choi's patches, this fixes up the asm-arm
header files for mmuless systems.  Over and above Hyok's patches:

- nommu.h merged into mmu.h (it's only a structure)
- nommu_context.h is essentially the same as mmu_context.h, but
  without the MM switching code.

so there's no point having separate files.  Also, in memory.h,
there's no point #ifndef'ing PHYS_OFFSET and END_MEM - both
CONFIG_DRAM_BASE and CONFIG_DRAM_SIZE will always be set by the
configuration scripts.

Other files have minor formatting changes, but are essentially
the same.  Hyok's original patches were signed off thusly:

  Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-28 17:59:45 +01:00

134 lines
3.0 KiB
C

/*
* linux/include/asm-arm/pgalloc.h
*
* Copyright (C) 2000-2001 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.
*/
#ifndef _ASMARM_PGALLOC_H
#define _ASMARM_PGALLOC_H
#include <asm/domain.h>
#include <asm/pgtable-hwdef.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#define check_pgt_cache() do { } while (0)
#ifdef CONFIG_MMU
#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
/*
* Since we have only two-level page tables, these are trivial
*/
#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
#define pmd_free(pmd) do { } while (0)
#define pgd_populate(mm,pmd,pte) BUG()
extern pgd_t *get_pgd_slow(struct mm_struct *mm);
extern void free_pgd_slow(pgd_t *pgd);
#define pgd_alloc(mm) get_pgd_slow(mm)
#define pgd_free(pgd) free_pgd_slow(pgd)
/*
* Allocate one PTE table.
*
* This actually allocates two hardware PTE tables, but we wrap this up
* into one table thus:
*
* +------------+
* | h/w pt 0 |
* +------------+
* | h/w pt 1 |
* +------------+
* | Linux pt 0 |
* +------------+
* | Linux pt 1 |
* +------------+
*/
static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
{
pte_t *pte;
pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
if (pte) {
clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE);
pte += PTRS_PER_PTE;
}
return pte;
}
static inline struct page *
pte_alloc_one(struct mm_struct *mm, unsigned long addr)
{
struct page *pte;
pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
if (pte) {
void *page = page_address(pte);
clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE);
}
return pte;
}
/*
* Free one PTE table.
*/
static inline void pte_free_kernel(pte_t *pte)
{
if (pte) {
pte -= PTRS_PER_PTE;
free_page((unsigned long)pte);
}
}
static inline void pte_free(struct page *pte)
{
__free_page(pte);
}
static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
{
pmdp[0] = __pmd(pmdval);
pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
flush_pmd_entry(pmdp);
}
/*
* Populate the pmdp entry with a pointer to the pte. This pmd is part
* of the mm address space.
*
* Ensure that we always set both PMD entries.
*/
static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
{
unsigned long pte_ptr = (unsigned long)ptep;
/*
* The pmd must be loaded with the physical
* address of the PTE table
*/
pte_ptr -= PTRS_PER_PTE * sizeof(void *);
__pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
}
static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep)
{
__pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
}
#endif /* CONFIG_MMU */
#endif