1 files changed, 93 insertions, 73 deletions

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 432acd07e76a..68028e8f26ce 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -21,25 +21,13 @@
 #include <asm/cacheflush.h>
 #include <asm/sections.h>
 #include <asm/cache.h>
+#include <asm/sizes.h>
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 pgd_t swapper_pg_dir[PTRS_PER_PGD];
 
-#ifdef CONFIG_SUPERH32
-/*
- * Handle trivial transitions between cached and uncached
- * segments, making use of the 1:1 mapping relationship in
- * 512MB lowmem.
- *
- * This is the offset of the uncached section from its cached alias.
- * Default value only valid in 29 bit mode, in 32bit mode will be
- * overridden in pmb_init.
- */
-unsigned long cached_to_uncached = P2SEG - P1SEG;
-#endif
-
 #ifdef CONFIG_MMU
-static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
+static pte_t *__get_pte_phys(unsigned long addr)
 {
         pgd_t *pgd;
         pud_t *pud;
@@ -49,22 +37,30 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
         pgd = pgd_offset_k(addr);
         if (pgd_none(*pgd)) {
                 pgd_ERROR(*pgd);
-                return;
+                return NULL;
         }
 
         pud = pud_alloc(NULL, pgd, addr);
         if (unlikely(!pud)) {
                 pud_ERROR(*pud);
-                return;
+                return NULL;
         }
 
         pmd = pmd_alloc(NULL, pud, addr);
         if (unlikely(!pmd)) {
                 pmd_ERROR(*pmd);
-                return;
+                return NULL;
         }
 
         pte = pte_offset_kernel(pmd, addr);
+        return pte;
+}
+
+static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
+{
+        pte_t *pte;
+
+        pte = __get_pte_phys(addr);
         if (!pte_none(*pte)) {
                 pte_ERROR(*pte);
                 return;
@@ -72,23 +68,24 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
 
         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
         local_flush_tlb_one(get_asid(), addr);
+
+        if (pgprot_val(prot) & _PAGE_WIRED)
+                tlb_wire_entry(NULL, addr, *pte);
+}
+
+static void clear_pte_phys(unsigned long addr, pgprot_t prot)
+{
+        pte_t *pte;
+
+        pte = __get_pte_phys(addr);
+
+        if (pgprot_val(prot) & _PAGE_WIRED)
+                tlb_unwire_entry();
+
+        set_pte(pte, pfn_pte(0, __pgprot(0)));
+        local_flush_tlb_one(get_asid(), addr);
 }
 
-/*
- * As a performance optimization, other platforms preserve the fixmap mapping
- * across a context switch, we don't presently do this, but this could be done
- * in a similar fashion as to the wired TLB interface that sh64 uses (by way
- * of the memory mapped UTLB configuration) -- this unfortunately forces us to
- * give up a TLB entry for each mapping we want to preserve. While this may be
- * viable for a small number of fixmaps, it's not particularly useful for
- * everything and needs to be carefully evaluated. (ie, we may want this for
- * the vsyscall page).
- *
- * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
- * in at __set_fixmap() time to determine the appropriate behavior to follow.
- *
- *                                       -- PFM.
- */
 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 {
         unsigned long address = __fix_to_virt(idx);
@@ -101,6 +98,18 @@ void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
         set_pte_phys(address, phys, prot);
 }
 
+void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
+{
+        unsigned long address = __fix_to_virt(idx);
+
+        if (idx >= __end_of_fixed_addresses) {
+                BUG();
+                return;
+        }
+
+        clear_pte_phys(address, prot);
+}
+
 void __init page_table_range_init(unsigned long start, unsigned long end,
                                          pgd_t *pgd_base)
 {
@@ -120,7 +129,13 @@ void __init page_table_range_init(unsigned long start, unsigned long end,
         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
                 pud = (pud_t *)pgd;
                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
+#ifdef __PAGETABLE_PMD_FOLDED
                         pmd = (pmd_t *)pud;
+#else
+                        pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
+                        pud_populate(&init_mm, pud, pmd);
+                        pmd += k;
+#endif
                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
                                 if (pmd_none(*pmd)) {
                                         pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
@@ -182,9 +197,6 @@ void __init paging_init(void)
         }
 
         free_area_init_nodes(max_zone_pfns);
-
-        /* Set up the uncached fixmap */
-        set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
 }
 
 /*
@@ -195,6 +207,8 @@ static void __init iommu_init(void)
         no_iommu_init();
 }
 
+unsigned int mem_init_done = 0;
+
 void __init mem_init(void)
 {
         int codesize, datasize, initsize;
@@ -231,6 +245,8 @@ void __init mem_init(void)
         memset(empty_zero_page, 0, PAGE_SIZE);
         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 
+        vsyscall_init();
+
         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
@@ -243,8 +259,48 @@ void __init mem_init(void)
                 datasize >> 10,
                 initsize >> 10);
 
-        /* Initialize the vDSO */
-        vsyscall_init();
+        printk(KERN_INFO "virtual kernel memory layout:\n"
+                "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+#ifdef CONFIG_HIGHMEM
+                "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+#endif
+                "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+                "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
+#ifdef CONFIG_UNCACHED_MAPPING
+                "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
+#endif
+                "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+                "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+                "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
+                FIXADDR_START, FIXADDR_TOP,
+                (FIXADDR_TOP - FIXADDR_START) >> 10,
+
+#ifdef CONFIG_HIGHMEM
+                PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
+                (LAST_PKMAP*PAGE_SIZE) >> 10,
+#endif
+
+                (unsigned long)VMALLOC_START, VMALLOC_END,
+                (VMALLOC_END - VMALLOC_START) >> 20,
+
+                (unsigned long)memory_start, (unsigned long)high_memory,
+                ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
+
+#ifdef CONFIG_UNCACHED_MAPPING
+                uncached_start, uncached_end, uncached_size >> 20,
+#endif
+
+                (unsigned long)&__init_begin, (unsigned long)&__init_end,
+                ((unsigned long)&__init_end -
+                 (unsigned long)&__init_begin) >> 10,
+
+                (unsigned long)&_etext, (unsigned long)&_edata,
+                ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
+
+                (unsigned long)&_text, (unsigned long)&_etext,
+                ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
+
+        mem_init_done = 1;
 }
 
 void free_initmem(void)
@@ -277,35 +333,6 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 }
 #endif
 
-#if THREAD_SHIFT < PAGE_SHIFT
-static struct kmem_cache *thread_info_cache;
-
-struct thread_info *alloc_thread_info(struct task_struct *tsk)
-{
-        struct thread_info *ti;
-
-        ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
-        if (unlikely(ti == NULL))
-                return NULL;
-#ifdef CONFIG_DEBUG_STACK_USAGE
-        memset(ti, 0, THREAD_SIZE);
-#endif
-        return ti;
-}
-
-void free_thread_info(struct thread_info *ti)
-{
-        kmem_cache_free(thread_info_cache, ti);
-}
-
-void thread_info_cache_init(void)
-{
-        thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
-                                              THREAD_SIZE, 0, NULL);
-        BUG_ON(thread_info_cache == NULL);
-}
-#endif /* THREAD_SHIFT < PAGE_SHIFT */
-
 #ifdef CONFIG_MEMORY_HOTPLUG
 int arch_add_memory(int nid, u64 start, u64 size)
 {
@@ -336,10 +363,3 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #endif
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
-
-#ifdef CONFIG_PMB
-int __in_29bit_mode(void)
-{
-        return !(ctrl_inl(PMB_PASCR) & PASCR_SE);
-}
-#endif /* CONFIG_PMB */