m68k: create ColdFire MMU pgalloc code

Add code to support the ColdFire V4e MMU pgalloc functions.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>
This commit is contained in:
Greg Ungerer 2011-10-18 16:52:41 +10:00
parent 0e6782c880
commit 74d4799221
2 changed files with 105 additions and 1 deletions

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@ -0,0 +1,102 @@
#ifndef M68K_MCF_PGALLOC_H
#define M68K_MCF_PGALLOC_H
#include <asm/tlb.h>
#include <asm/tlbflush.h>
extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
free_page((unsigned long) pte);
}
extern const char bad_pmd_string[];
extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
{
unsigned long page = __get_free_page(GFP_DMA|__GFP_REPEAT);
if (!page)
return NULL;
memset((void *)page, 0, PAGE_SIZE);
return (pte_t *) (page);
}
extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
{
return (pmd_t *) pgd;
}
#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
#define pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr)
#define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
(unsigned long)(page_address(page)))
#define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
#define pmd_pgtable(pmd) pmd_page(pmd)
static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
unsigned long address)
{
__free_page(page);
}
#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
static inline struct page *pte_alloc_one(struct mm_struct *mm,
unsigned long address)
{
struct page *page = alloc_pages(GFP_DMA|__GFP_REPEAT, 0);
pte_t *pte;
if (!page)
return NULL;
pte = kmap(page);
if (pte) {
clear_page(pte);
__flush_page_to_ram(pte);
flush_tlb_kernel_page(pte);
nocache_page(pte);
}
kunmap(page);
return page;
}
extern inline void pte_free(struct mm_struct *mm, struct page *page)
{
__free_page(page);
}
/*
* In our implementation, each pgd entry contains 1 pmd that is never allocated
* or freed. pgd_present is always 1, so this should never be called. -NL
*/
#define pmd_free(mm, pmd) BUG()
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
free_page((unsigned long) pgd);
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *new_pgd;
new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
if (!new_pgd)
return NULL;
memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
return new_pgd;
}
#define pgd_populate(mm, pmd, pte) BUG()
#endif /* M68K_MCF_PGALLOC_H */

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@ -7,7 +7,9 @@
#ifdef CONFIG_MMU
#include <asm/virtconvert.h>
#ifdef CONFIG_SUN3
#if defined(CONFIG_COLDFIRE)
#include <asm/mcf_pgalloc.h>
#elif defined(CONFIG_SUN3)
#include <asm/sun3_pgalloc.h>
#else
#include <asm/motorola_pgalloc.h>