[SPARC64]: Add CONFIG_DEBUG_PAGEALLOC support.
[linux-2.6.git] / arch / sparc64 / mm / init.c
index cf74737..8d72f8a 100644 (file)
@@ -1332,15 +1332,114 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
        return end_pfn;
 }
 
+#ifdef CONFIG_DEBUG_PAGEALLOC
+static unsigned long kernel_map_range(unsigned long pstart, unsigned long pend, pgprot_t prot)
+{
+       unsigned long vstart = PAGE_OFFSET + pstart;
+       unsigned long vend = PAGE_OFFSET + pend;
+       unsigned long alloc_bytes = 0UL;
+
+       if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) {
+               prom_printf("kernel_map: Unaligned sp_banks[%lx:%lx]\n",
+                           vstart, vend);
+               prom_halt();
+       }
+
+       while (vstart < vend) {
+               unsigned long this_end, paddr = __pa(vstart);
+               pgd_t *pgd = pgd_offset_k(vstart);
+               pud_t *pud;
+               pmd_t *pmd;
+               pte_t *pte;
+
+               pud = pud_offset(pgd, vstart);
+               if (pud_none(*pud)) {
+                       pmd_t *new;
+
+                       new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+                       alloc_bytes += PAGE_SIZE;
+                       pud_populate(&init_mm, pud, new);
+               }
+
+               pmd = pmd_offset(pud, vstart);
+               if (!pmd_present(*pmd)) {
+                       pte_t *new;
+
+                       new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+                       alloc_bytes += PAGE_SIZE;
+                       pmd_populate_kernel(&init_mm, pmd, new);
+               }
+
+               pte = pte_offset_kernel(pmd, vstart);
+               this_end = (vstart + PMD_SIZE) & PMD_MASK;
+               if (this_end > vend)
+                       this_end = vend;
+
+               while (vstart < this_end) {
+                       pte_val(*pte) = (paddr | pgprot_val(prot));
+
+                       vstart += PAGE_SIZE;
+                       paddr += PAGE_SIZE;
+                       pte++;
+               }
+       }
+
+       return alloc_bytes;
+}
+
+extern struct linux_mlist_p1275 *prom_ptot_ptr;
+extern unsigned int kvmap_linear_patch[1];
+
+static void __init kernel_physical_mapping_init(void)
+{
+       struct linux_mlist_p1275 *p = prom_ptot_ptr;
+       unsigned long mem_alloced = 0UL;
+
+       while (p) {
+               unsigned long phys_start, phys_end;
+
+               phys_start = p->start_adr;
+               phys_end = phys_start + p->num_bytes;
+               mem_alloced += kernel_map_range(phys_start, phys_end,
+                                               PAGE_KERNEL);
+
+               p = p->theres_more;
+       }
+
+       printk("Allocated %ld bytes for kernel page tables.\n",
+              mem_alloced);
+
+       kvmap_linear_patch[0] = 0x01000000; /* nop */
+       flushi(&kvmap_linear_patch[0]);
+
+       __flush_tlb_all();
+}
+
+void kernel_map_pages(struct page *page, int numpages, int enable)
+{
+       unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
+       unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);
+
+       kernel_map_range(phys_start, phys_end,
+                        (enable ? PAGE_KERNEL : __pgprot(0)));
+
+       /* we should perform an IPI and flush all tlbs,
+        * but that can deadlock->flush only current cpu.
+        */
+       __flush_tlb_kernel_range(PAGE_OFFSET + phys_start,
+                                PAGE_OFFSET + phys_end);
+}
+#endif
+
 /* paging_init() sets up the page tables */
 
 extern void cheetah_ecache_flush_init(void);
 
 static unsigned long last_valid_pfn;
+pgd_t swapper_pg_dir[2048];
 
 void __init paging_init(void)
 {
-       extern pmd_t swapper_pmd_dir[1024];
        unsigned long end_pfn, pages_avail, shift;
        unsigned long real_end;
 
@@ -1361,11 +1460,11 @@ void __init paging_init(void)
         */
        init_mm.pgd += ((shift) / (sizeof(pgd_t)));
        
-       memset(swapper_pmd_dir, 0, sizeof(swapper_pmd_dir));
+       memset(swapper_low_pmd_dir, 0, sizeof(swapper_low_pmd_dir));
 
        /* Now can init the kernel/bad page tables. */
        pud_set(pud_offset(&swapper_pg_dir[0], 0),
-               swapper_pmd_dir + (shift / sizeof(pgd_t)));
+               swapper_low_pmd_dir + (shift / sizeof(pgd_t)));
        
        swapper_pgd_zero = pgd_val(swapper_pg_dir[0]);
        
@@ -1390,6 +1489,10 @@ void __init paging_init(void)
        pages_avail = 0;
        last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
 
+#ifdef CONFIG_DEBUG_PAGEALLOC
+       kernel_physical_mapping_init();
+#endif
+
        {
                unsigned long zones_size[MAX_NR_ZONES];
                unsigned long zholes_size[MAX_NR_ZONES];