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sh: Populate swapper_pg_dir with fixmap range.

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This saves us from having to use kmalloc() for the fixmap entries,
which is needed early for the uncached fixmap.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Stuart Menefy 2007-11-30 17:59:55 +09:00 committed by Paul Mundt
parent d02b08f6e8
commit 2adb4e1009
1 changed files with 36 additions and 0 deletions
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36
arch/sh/mm/init.c
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@ -130,6 +130,37 @@ void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
set_pte_phys(address, phys, prot); set_pte_phys(address, phys, prot);
} }
void __init page_table_range_init(unsigned long start, unsigned long end,
pgd_t *pgd_base)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
int pgd_idx;
unsigned long vaddr;
vaddr = start & PMD_MASK;
end = (end + PMD_SIZE - 1) & PMD_MASK;
pgd_idx = pgd_index(vaddr);
pgd = pgd_base + pgd_idx;
for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
BUG_ON(pgd_none(*pgd));
pud = pud_offset(pgd, 0);
BUG_ON(pud_none(*pud));
pmd = pmd_offset(pud, 0);
if (!pmd_present(*pmd)) {
pte_t *pte_table;
pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
memset(pte_table, 0, PAGE_SIZE);
pmd_populate_kernel(&init_mm, pmd, pte_table);
}
vaddr += PMD_SIZE;
}
}
#endif /* CONFIG_MMU */ #endif /* CONFIG_MMU */
/* /*
@ -149,6 +180,11 @@ void __init paging_init(void)
* check for a null value. */ * check for a null value. */
set_TTB(swapper_pg_dir); set_TTB(swapper_pg_dir);
/* Populate the relevant portions of swapper_pg_dir so that
* we can use the fixmap entries without calling kmalloc.
* pte's will be filled in by __set_fixmap(). */
page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir);
memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
for_each_online_node(nid) { for_each_online_node(nid) {