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>

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) {