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-rw-r--r--arch/sparc64/mm/init.c187
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
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-18 10:41:08 +0300