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Diffstat (limited to 'arch/csky/mm/highmem.c')
-rw-r--r--arch/csky/mm/highmem.c179
1 files changed, 6 insertions, 173 deletions
diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c
index 3317b774f6dc..4161df3c6c15 100644
--- a/arch/csky/mm/highmem.c
+++ b/arch/csky/mm/highmem.c
@@ -9,195 +9,28 @@
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
-static pte_t *kmap_pte;
-
unsigned long highstart_pfn, highend_pfn;
-void *kmap(struct page *page)
-{
- void *addr;
-
- might_sleep();
- if (!PageHighMem(page))
- return page_address(page);
- addr = kmap_high(page);
- flush_tlb_one((unsigned long)addr);
-
- return addr;
-}
-EXPORT_SYMBOL(kmap);
-
-void kunmap(struct page *page)
-{
- BUG_ON(in_interrupt());
- if (!PageHighMem(page))
- return;
- kunmap_high(page);
-}
-EXPORT_SYMBOL(kunmap);
-
-void *kmap_atomic(struct page *page)
-{
- unsigned long vaddr;
- int idx, type;
-
- preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
-
- type = kmap_atomic_idx_push();
- idx = type + KM_TYPE_NR*smp_processor_id();
- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-#ifdef CONFIG_DEBUG_HIGHMEM
- BUG_ON(!pte_none(*(kmap_pte - idx)));
-#endif
- set_pte(kmap_pte-idx, mk_pte(page, PAGE_KERNEL));
- flush_tlb_one((unsigned long)vaddr);
-
- return (void *)vaddr;
-}
-EXPORT_SYMBOL(kmap_atomic);
-
-void __kunmap_atomic(void *kvaddr)
-{
- unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
- int idx;
-
- if (vaddr < FIXADDR_START)
- goto out;
-
-#ifdef CONFIG_DEBUG_HIGHMEM
- idx = KM_TYPE_NR*smp_processor_id() + kmap_atomic_idx();
-
- BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
-
- pte_clear(&init_mm, vaddr, kmap_pte - idx);
- flush_tlb_one(vaddr);
-#else
- (void) idx; /* to kill a warning */
-#endif
- kmap_atomic_idx_pop();
-out:
- pagefault_enable();
- preempt_enable();
-}
-EXPORT_SYMBOL(__kunmap_atomic);
-
-/*
- * This is the same as kmap_atomic() but can map memory that doesn't
- * have a struct page associated with it.
- */
-void *kmap_atomic_pfn(unsigned long pfn)
-{
- unsigned long vaddr;
- int idx, type;
-
- pagefault_disable();
-
- type = kmap_atomic_idx_push();
- idx = type + KM_TYPE_NR*smp_processor_id();
- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
- set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL));
- flush_tlb_one(vaddr);
-
- return (void *) vaddr;
-}
-
-struct page *kmap_atomic_to_page(void *ptr)
+void kmap_flush_tlb(unsigned long addr)
{
- unsigned long idx, vaddr = (unsigned long)ptr;
- pte_t *pte;
-
- if (vaddr < FIXADDR_START)
- return virt_to_page(ptr);
-
- idx = virt_to_fix(vaddr);
- pte = kmap_pte - (idx - FIX_KMAP_BEGIN);
- return pte_page(*pte);
+ flush_tlb_one(addr);
}
+EXPORT_SYMBOL(kmap_flush_tlb);
-static void __init fixrange_init(unsigned long start, unsigned long end,
- pgd_t *pgd_base)
-{
-#ifdef CONFIG_HIGHMEM
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- int i, j, k;
- unsigned long vaddr;
-
- vaddr = start;
- i = __pgd_offset(vaddr);
- j = __pud_offset(vaddr);
- k = __pmd_offset(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;
- }
-#endif
-}
-
-void __init fixaddr_kmap_pages_init(void)
+void __init kmap_init(void)
{
unsigned long vaddr;
- pgd_t *pgd_base;
-#ifdef CONFIG_HIGHMEM
pgd_t *pgd;
pmd_t *pmd;
pud_t *pud;
pte_t *pte;
-#endif
- pgd_base = swapper_pg_dir;
- /*
- * Fixed mappings:
- */
- vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
- fixrange_init(vaddr, 0, pgd_base);
-
-#ifdef CONFIG_HIGHMEM
- /*
- * Permanent kmaps:
- */
vaddr = PKMAP_BASE;
- fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
+ fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
- pgd = swapper_pg_dir + __pgd_offset(vaddr);
+ pgd = swapper_pg_dir + pgd_index(vaddr);
pud = (pud_t *)pgd;
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
pkmap_page_table = pte;
-#endif
-}
-
-void __init kmap_init(void)
-{
- unsigned long vaddr;
-
- fixaddr_kmap_pages_init();
-
- vaddr = __fix_to_virt(FIX_KMAP_BEGIN);
-
- kmap_pte = pte_offset_kernel((pmd_t *)pgd_offset_k(vaddr), vaddr);
}