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authorStuart Menefy <stuart.menefy@st.com>2007-11-30 17:59:55 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 13:18:59 +0900
commit2adb4e10092ee1719539bcfe397b96dbdc863e2e (patch)
tree58bac034f7ab907b5159be0468eefcd201937b66 /arch
parentsh: Clean up places that make 29-bit physical assumptions. (diff)
downloadlinux-dev-2adb4e10092ee1719539bcfe397b96dbdc863e2e.tar.xz
linux-dev-2adb4e10092ee1719539bcfe397b96dbdc863e2e.zip
sh: Populate swapper_pg_dir with fixmap range.
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/mm/init.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 094225e0d722..2918c6b14659 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -130,6 +130,37 @@ void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t 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 */
/*
@@ -149,6 +180,11 @@ void __init paging_init(void)
* check for a null value. */
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));
for_each_online_node(nid) {