1 files changed, 74 insertions, 113 deletions

diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 0d2e967c7200..1e44ee26cee8 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -105,7 +105,7 @@ static void __init read_obp_memory(const char *property,
                 regs[i].phys_addr = base;
                 regs[i].reg_size = size;
         }
-        sort(regs, ents, sizeof(struct  linux_prom64_registers),
+        sort(regs, ents, sizeof(struct linux_prom64_registers),
              cmp_p64, NULL);
 }
 
@@ -367,8 +367,11 @@ struct linux_prom_translation {
         unsigned long size;
         unsigned long data;
 };
-static struct linux_prom_translation prom_trans[512] __initdata;
-static unsigned int prom_trans_ents __initdata;
+
+/* Exported for kernel TLB miss handling in ktlb.S */
+struct linux_prom_translation prom_trans[512] __read_mostly;
+unsigned int prom_trans_ents __read_mostly;
+unsigned int swapper_pgd_zero __read_mostly;
 
 extern unsigned long prom_boot_page;
 extern void prom_remap(unsigned long physpage, unsigned long virtpage, int mmu_ihandle);
@@ -378,122 +381,57 @@ extern void register_prom_callbacks(void);
 /* Exported for SMP bootup purposes. */
 unsigned long kern_locked_tte_data;
 
-/* Exported for kernel TLB miss handling in ktlb.S */
-unsigned long prom_pmd_phys __read_mostly;
-unsigned int swapper_pgd_zero __read_mostly;
-
-static pmd_t *prompmd __read_mostly;
-
-#define BASE_PAGE_SIZE 8192
-
 /*
  * Translate PROM's mapping we capture at boot time into physical address.
  * The second parameter is only set from prom_callback() invocations.
  */
 unsigned long prom_virt_to_phys(unsigned long promva, int *error)
 {
-        pmd_t *pmdp = prompmd + ((promva >> 23) & 0x7ff);
-        pte_t *ptep;
-        unsigned long base;
-
-        if (pmd_none(*pmdp)) {
-                if (error)
-                        *error = 1;
-                return 0;
-        }
-        ptep = (pte_t *)__pmd_page(*pmdp) + ((promva >> 13) & 0x3ff);
-        if (!pte_present(*ptep)) {
-                if (error)
-                        *error = 1;
-                return 0;
-        }
-        if (error) {
-                *error = 0;
-                return pte_val(*ptep);
-        }
-        base = pte_val(*ptep) & _PAGE_PADDR;
-
-        return base + (promva & (BASE_PAGE_SIZE - 1));
-}
+        int i;
 
-/* The obp translations are saved based on 8k pagesize, since obp can
- * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
- * HI_OBP_ADDRESS range are handled in entry.S and do not use the vpte
- * scheme (also, see rant in inherit_locked_prom_mappings()).
- */
-static void __init build_obp_range(unsigned long start, unsigned long end, unsigned long data)
-{
-        unsigned long vaddr;
+        for (i = 0; i < prom_trans_ents; i++) {
+                struct linux_prom_translation *p = &prom_trans[i];
 
-        for (vaddr = start; vaddr < end; vaddr += BASE_PAGE_SIZE) {
-                unsigned long val;
-                pmd_t *pmd;
-                pte_t *pte;
+                if (promva >= p->virt &&
+                    promva < (p->virt + p->size)) {
+                        unsigned long base = p->data & _PAGE_PADDR;
 
-                pmd = prompmd + ((vaddr >> 23) & 0x7ff);
-                if (pmd_none(*pmd)) {
-                        pte = __alloc_bootmem(BASE_PAGE_SIZE, BASE_PAGE_SIZE,
-                                              PAGE_SIZE);
-                        if (!pte)
-                                prom_halt();
-                        memset(pte, 0, BASE_PAGE_SIZE);
-                        pmd_set(pmd, pte);
+                        if (error)
+                                *error = 0;
+                        return base + (promva & (8192 - 1));
                 }
-                pte = (pte_t *) __pmd_page(*pmd) + ((vaddr >> 13) & 0x3ff);
-
-                val = data;
-
-                /* Clear diag TTE bits. */
-                if (tlb_type == spitfire)
-                        val &= ~0x0003fe0000000000UL;
-
-                set_pte_at(&init_mm, vaddr, pte,
-                           __pte(val | _PAGE_MODIFIED));
-
-                data += BASE_PAGE_SIZE;
         }
+        if (error)
+                *error = 1;
+        return 0UL;
 }
 
+/* The obp translations are saved based on 8k pagesize, since obp can
+ * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
+ * HI_OBP_ADDRESS range are handled in ktlb.S and do not use the vpte
+ * scheme (also, see rant in inherit_locked_prom_mappings()).
+ */
 static inline int in_obp_range(unsigned long vaddr)
 {
         return (vaddr >= LOW_OBP_ADDRESS &&
                 vaddr < HI_OBP_ADDRESS);
 }
 
-#define OBP_PMD_SIZE 2048
-static void __init build_obp_pgtable(void)
+static int cmp_ptrans(const void *a, const void *b)
 {
-        unsigned long i;
-
-        prompmd = __alloc_bootmem(OBP_PMD_SIZE, OBP_PMD_SIZE, PAGE_SIZE);
-        if (!prompmd)
-                prom_halt();
-
-        memset(prompmd, 0, OBP_PMD_SIZE);
-
-        prom_pmd_phys = __pa(prompmd);
-
-        for (i = 0; i < prom_trans_ents; i++) {
-                unsigned long start, end;
-
-                if (!in_obp_range(prom_trans[i].virt))
-                        continue;
+        const struct linux_prom_translation *x = a, *y = b;
 
-                start = prom_trans[i].virt;
-                end = start + prom_trans[i].size;
-                if (end > HI_OBP_ADDRESS)
-                        end = HI_OBP_ADDRESS;
-
-                build_obp_range(start, end, prom_trans[i].data);
-        }
+        if (x->virt > y->virt)
+                return 1;
+        if (x->virt < y->virt)
+                return -1;
+        return 0;
 }
 
-/* Read OBP translations property into 'prom_trans[]'.
- * Return the number of entries.
- */
+/* Read OBP translations property into 'prom_trans[]'.  */
 static void __init read_obp_translations(void)
 {
-        int n, node;
+        int n, node, ents, first, last, i;
 
         node = prom_finddevice("/virtual-memory");
         n = prom_getproplen(node, "translations");
@@ -515,7 +453,41 @@ static void __init read_obp_translations(void)
 
         n = n / sizeof(struct linux_prom_translation);
 
-        prom_trans_ents = n;
+        ents = n;
+
+        sort(prom_trans, ents, sizeof(struct linux_prom_translation),
+             cmp_ptrans, NULL);
+
+        /* Now kick out all the non-OBP entries.  */
+        for (i = 0; i < ents; i++) {
+                if (in_obp_range(prom_trans[i].virt))
+                        break;
+        }
+        first = i;
+        for (; i < ents; i++) {
+                if (!in_obp_range(prom_trans[i].virt))
+                        break;
+        }
+        last = i;
+
+        for (i = 0; i < (last - first); i++) {
+                struct linux_prom_translation *src = &prom_trans[i + first];
+                struct linux_prom_translation *dest = &prom_trans[i];
+
+                *dest = *src;
+        }
+        for (; i < ents; i++) {
+                struct linux_prom_translation *dest = &prom_trans[i];
+                dest->virt = dest->size = dest->data = 0x0UL;
+        }
+
+        prom_trans_ents = last - first;
+
+        if (tlb_type == spitfire) {
+                /* Clear diag TTE bits. */
+                for (i = 0; i < prom_trans_ents; i++)
+                        prom_trans[i].data &= ~0x0003fe0000000000UL;
+        }
 }
 
 static void __init remap_kernel(void)
@@ -553,21 +525,18 @@ static void __init remap_kernel(void)
 }
 
 
-static void __init inherit_prom_mappings_pre(void)
+static void __init inherit_prom_mappings(void)
 {
         read_obp_translations();
 
         /* Now fixup OBP's idea about where we really are mapped. */
         prom_printf("Remapping the kernel... ");
         remap_kernel();
-
         prom_printf("done.\n");
-}
 
-static void __init inherit_prom_mappings_post(void)
-{
-        build_obp_pgtable();
+        prom_printf("Registering callbacks... ");
         register_prom_callbacks();
+        prom_printf("done.\n");
 }
 
 /* The OBP specifications for sun4u mark 0xfffffffc00000000 and
@@ -1519,7 +1488,7 @@ void __init paging_init(void)
         
         swapper_pgd_zero = pgd_val(swapper_pg_dir[0]);
         
-        inherit_prom_mappings_pre();
+        inherit_prom_mappings();
         
         /* Ok, we can use our TLB miss and window trap handlers safely.
          * We need to do a quick peek here to see if we are on StarFire
@@ -1530,23 +1499,15 @@ void __init paging_init(void)
                 extern void setup_tba(int);
                 setup_tba(this_is_starfire);
         }
-        __flush_tlb_all();
 
-        /* Everything from this point forward, until we are done with
-         * inherit_prom_mappings_post(), must complete successfully
-         * without calling into the firmware.  The firwmare page tables
-         * have not been built, but we are running on the Linux kernel's
-         * trap table.
-         */
+        inherit_locked_prom_mappings(1);
+
+        __flush_tlb_all();
 
         /* Setup bootmem... */
         pages_avail = 0;
         last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
 
-        inherit_prom_mappings_post();
-
-        inherit_locked_prom_mappings(1);
-
 #ifdef CONFIG_DEBUG_PAGEALLOC
         kernel_physical_mapping_init();
 #endif