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ARM: early_pte_alloc()

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Provide a common function for allocating early PTE tables.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-07-01 18:33:29 +01:00
parent 3abe9d33b3
commit 4bb2e27db1
1 changed files with 13 additions and 13 deletions
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26
arch/arm/mm/mmu.c
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@ -492,18 +492,21 @@ static void __init *early_alloc(unsigned long sz)
return alloc_bootmem_low_pages(sz);
}
static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, unsigned long prot)
{
if (pmd_none(*pmd)) {
pte_t *pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t));
__pmd_populate(pmd, __pa(pte) | prot);
}
BUG_ON(pmd_bad(*pmd));
return pte_offset_kernel(pmd, addr);
}
static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
unsigned long end, unsigned long pfn,
const struct mem_type *type)
{
pte_t *pte;
if (pmd_none(*pmd)) {
pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t));
__pmd_populate(pmd, __pa(pte) | type->prot_l1);
}
pte = pte_offset_kernel(pmd, addr);
pte_t *pte = early_pte_alloc(pmd, addr, type->prot_l1);
do {
set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);
pfn++;
@ -949,11 +952,8 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
static void __init kmap_init(void)
{
#ifdef CONFIG_HIGHMEM
pmd_t *pmd = pmd_off_k(PKMAP_BASE);
pte_t *pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t));
BUG_ON(!pmd_none(*pmd) || !pte);
__pmd_populate(pmd, __pa(pte) | _PAGE_KERNEL_TABLE);
pkmap_page_table = pte + PTRS_PER_PTE;
pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE),
PKMAP_BASE, _PAGE_KERNEL_TABLE);
#endif
}