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Diffstat (limited to 'arch/csky/mm/init.c')
-rw-r--r--arch/csky/mm/init.c147
1 files changed, 98 insertions, 49 deletions
diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index d4c2292ea46b..573da66b2543 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -19,65 +19,32 @@
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/pfn.h>
+#include <linux/initrd.h>
#include <asm/setup.h>
#include <asm/cachectl.h>
#include <asm/dma.h>
-#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+
+#define PTRS_KERN_TABLE \
+ ((PTRS_PER_PGD - USER_PTRS_PER_PGD) * PTRS_PER_PTE)
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
+pte_t kernel_pte_tables[PTRS_KERN_TABLE] __page_aligned_bss;
+
+EXPORT_SYMBOL(invalid_pte_table);
unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
__page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);
-void __init mem_init(void)
-{
-#ifdef CONFIG_HIGHMEM
- unsigned long tmp;
-
- max_mapnr = highend_pfn;
-#else
- max_mapnr = max_low_pfn;
-#endif
- high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
-
- memblock_free_all();
-
-#ifdef CONFIG_HIGHMEM
- for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
- struct page *page = pfn_to_page(tmp);
-
- /* FIXME not sure about */
- if (!memblock_is_reserved(tmp << PAGE_SHIFT))
- free_highmem_page(page);
- }
-#endif
- mem_init_print_info(NULL);
-}
-
-extern char __init_begin[], __init_end[];
-
void free_initmem(void)
{
- unsigned long addr;
-
- addr = (unsigned long) &__init_begin;
-
- while (addr < (unsigned long) &__init_end) {
- ClearPageReserved(virt_to_page(addr));
- init_page_count(virt_to_page(addr));
- free_page(addr);
- totalram_pages_inc();
- addr += PAGE_SIZE;
- }
-
- pr_info("Freeing unused kernel memory: %dk freed\n",
- ((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
+ free_initmem_default(-1);
}
void pgd_init(unsigned long *p)
@@ -86,18 +53,100 @@ void pgd_init(unsigned long *p)
for (i = 0; i < PTRS_PER_PGD; i++)
p[i] = __pa(invalid_pte_table);
+
+ flush_tlb_all();
+ local_icache_inv_all(NULL);
}
-void __init pre_mmu_init(void)
+void __init mmu_init(unsigned long min_pfn, unsigned long max_pfn)
{
- /*
- * Setup page-table and enable TLB-hardrefill
- */
+ int i;
+
+ for (i = 0; i < USER_PTRS_PER_PGD; i++)
+ swapper_pg_dir[i].pgd = __pa(invalid_pte_table);
+
+ for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++)
+ swapper_pg_dir[i].pgd =
+ __pa(kernel_pte_tables + (PTRS_PER_PTE * (i - USER_PTRS_PER_PGD)));
+
+ for (i = 0; i < PTRS_KERN_TABLE; i++)
+ set_pte(&kernel_pte_tables[i], __pte(_PAGE_GLOBAL));
+
+ for (i = min_pfn; i < max_pfn; i++)
+ set_pte(&kernel_pte_tables[i - PFN_DOWN(va_pa_offset)], pfn_pte(i, PAGE_KERNEL));
+
flush_tlb_all();
- pgd_init((unsigned long *)swapper_pg_dir);
- TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
- TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
+ local_icache_inv_all(NULL);
/* Setup page mask to 4k */
write_mmu_pagemask(0);
+
+ setup_pgd(swapper_pg_dir, 0);
+}
+
+void __init fixrange_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ int i, j, k;
+ unsigned long vaddr;
+
+ vaddr = start;
+ i = pgd_index(vaddr);
+ j = pud_index(vaddr);
+ k = pmd_index(vaddr);
+ pgd = pgd_base + i;
+
+ for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
+ pud = (pud_t *)pgd;
+ for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
+ pmd = (pmd_t *)pud;
+ for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
+ if (pmd_none(*pmd)) {
+ pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
+ if (!pte)
+ panic("%s: Failed to allocate %lu bytes align=%lx\n",
+ __func__, PAGE_SIZE,
+ PAGE_SIZE);
+
+ set_pmd(pmd, __pmd(__pa(pte)));
+ BUG_ON(pte != pte_offset_kernel(pmd, 0));
+ }
+ vaddr += PMD_SIZE;
+ }
+ k = 0;
+ }
+ j = 0;
+ }
+}
+
+void __init fixaddr_init(void)
+{
+ unsigned long vaddr;
+
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
}
+
+static const pgprot_t protection_map[16] = {
+ [VM_NONE] = PAGE_NONE,
+ [VM_READ] = PAGE_READ,
+ [VM_WRITE] = PAGE_READ,
+ [VM_WRITE | VM_READ] = PAGE_READ,
+ [VM_EXEC] = PAGE_READ,
+ [VM_EXEC | VM_READ] = PAGE_READ,
+ [VM_EXEC | VM_WRITE] = PAGE_READ,
+ [VM_EXEC | VM_WRITE | VM_READ] = PAGE_READ,
+ [VM_SHARED] = PAGE_NONE,
+ [VM_SHARED | VM_READ] = PAGE_READ,
+ [VM_SHARED | VM_WRITE] = PAGE_WRITE,
+ [VM_SHARED | VM_WRITE | VM_READ] = PAGE_WRITE,
+ [VM_SHARED | VM_EXEC] = PAGE_READ,
+ [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ,
+ [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_WRITE,
+ [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_WRITE
+};
+DECLARE_VM_GET_PAGE_PROT