1 files changed, 304 insertions, 0 deletions

diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
new file mode 100644
index 000000000000..b027ce7efbc6
--- /dev/null
+++ b/arch/mips/mm/init.c
@@ -0,0 +1,304 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994 - 2000 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/pagemap.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/swap.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cachectl.h>
+#include <asm/cpu.h>
+#include <asm/dma.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+unsigned long highstart_pfn, highend_pfn;
+
+/*
+ * We have up to 8 empty zeroed pages so we can map one of the right colour
+ * when needed.  This is necessary only on R4000 / R4400 SC and MC versions
+ * where we have to avoid VCED / VECI exceptions for good performance at
+ * any price.  Since page is never written to after the initialization we
+ * don't have to care about aliases on other CPUs.
+ */
+unsigned long empty_zero_page, zero_page_mask;
+
+/*
+ * Not static inline because used by IP27 special magic initialization code
+ */
+unsigned long setup_zero_pages(void)
+{
+        unsigned long order, size;
+        struct page *page;
+
+        if (cpu_has_vce)
+                order = 3;
+        else
+                order = 0;
+
+        empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+        if (!empty_zero_page)
+                panic("Oh boy, that early out of memory?");
+
+        page = virt_to_page(empty_zero_page);
+        while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
+                set_bit(PG_reserved, &page->flags);
+                set_page_count(page, 0);
+                page++;
+        }
+
+        size = PAGE_SIZE << order;
+        zero_page_mask = (size - 1) & PAGE_MASK;
+
+        return 1UL << order;
+}
+
+#ifdef CONFIG_HIGHMEM
+pte_t *kmap_pte;
+pgprot_t kmap_prot;
+
+#define kmap_get_fixmap_pte(vaddr)                                      \
+        pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
+
+static void __init kmap_init(void)
+{
+        unsigned long kmap_vstart;
+
+        /* cache the first kmap pte */
+        kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
+        kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
+
+        kmap_prot = PAGE_KERNEL;
+}
+
+#ifdef CONFIG_MIPS64
+static void __init fixrange_init(unsigned long start, unsigned long end,
+        pgd_t *pgd_base)
+{
+        pgd_t *pgd;
+        pmd_t *pmd;
+        pte_t *pte;
+        int i, j;
+        unsigned long vaddr;
+
+        vaddr = start;
+        i = __pgd_offset(vaddr);
+        j = __pmd_offset(vaddr);
+        pgd = pgd_base + i;
+
+        for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
+                pmd = (pmd_t *)pgd;
+                for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
+                        if (pmd_none(*pmd)) {
+                                pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+                                set_pmd(pmd, __pmd(pte));
+                                if (pte != pte_offset_kernel(pmd, 0))
+                                        BUG();
+                        }
+                        vaddr += PMD_SIZE;
+                }
+                j = 0;
+        }
+}
+#endif /* CONFIG_MIPS64 */
+#endif /* CONFIG_HIGHMEM */
+
+#ifndef CONFIG_DISCONTIGMEM
+extern void pagetable_init(void);
+
+void __init paging_init(void)
+{
+        unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+        unsigned long max_dma, high, low;
+
+        pagetable_init();
+
+#ifdef CONFIG_HIGHMEM
+        kmap_init();
+#endif
+
+        max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+        low = max_low_pfn;
+        high = highend_pfn;
+
+#ifdef CONFIG_ISA
+        if (low < max_dma)
+                zones_size[ZONE_DMA] = low;
+        else {
+                zones_size[ZONE_DMA] = max_dma;
+                zones_size[ZONE_NORMAL] = low - max_dma;
+        }
+#else
+        zones_size[ZONE_DMA] = low;
+#endif
+#ifdef CONFIG_HIGHMEM
+        if (cpu_has_dc_aliases) {
+                printk(KERN_WARNING "This processor doesn't support highmem.");
+                if (high - low)
+                        printk(" %ldk highmem ignored", high - low);
+                printk("\n");
+        } else
+                zones_size[ZONE_HIGHMEM] = high - low;
+#endif
+
+        free_area_init(zones_size);
+}
+
+#define PFN_UP(x)       (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
+#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
+
+static inline int page_is_ram(unsigned long pagenr)
+{
+        int i;
+
+        for (i = 0; i < boot_mem_map.nr_map; i++) {
+                unsigned long addr, end;
+
+                if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+                        /* not usable memory */
+                        continue;
+
+                addr = PFN_UP(boot_mem_map.map[i].addr);
+                end = PFN_DOWN(boot_mem_map.map[i].addr +
+                               boot_mem_map.map[i].size);
+
+                if (pagenr >= addr && pagenr < end)
+                        return 1;
+        }
+
+        return 0;
+}
+
+void __init mem_init(void)
+{
+        unsigned long codesize, reservedpages, datasize, initsize;
+        unsigned long tmp, ram;
+
+#ifdef CONFIG_HIGHMEM
+#ifdef CONFIG_DISCONTIGMEM
+#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
+#endif
+        max_mapnr = num_physpages = highend_pfn;
+#else
+        max_mapnr = num_physpages = max_low_pfn;
+#endif
+        high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+
+        totalram_pages += free_all_bootmem();
+        totalram_pages -= setup_zero_pages();   /* Setup zeroed pages.  */
+
+        reservedpages = ram = 0;
+        for (tmp = 0; tmp < max_low_pfn; tmp++)
+                if (page_is_ram(tmp)) {
+                        ram++;
+                        if (PageReserved(mem_map+tmp))
+                                reservedpages++;
+                }
+
+#ifdef CONFIG_HIGHMEM
+        for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
+                struct page *page = mem_map + tmp;
+
+                if (!page_is_ram(tmp)) {
+                        SetPageReserved(page);
+                        continue;
+                }
+                ClearPageReserved(page);
+#ifdef CONFIG_LIMITED_DMA
+                set_page_address(page, lowmem_page_address(page));
+#endif
+                set_bit(PG_highmem, &page->flags);
+                set_page_count(page, 1);
+                __free_page(page);
+                totalhigh_pages++;
+        }
+        totalram_pages += totalhigh_pages;
+#endif
+
+        codesize =  (unsigned long) &_etext - (unsigned long) &_text;
+        datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
+        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+        printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
+               "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
+               (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+               ram << (PAGE_SHIFT-10),
+               codesize >> 10,
+               reservedpages << (PAGE_SHIFT-10),
+               datasize >> 10,
+               initsize >> 10,
+               (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
+}
+#endif /* !CONFIG_DISCONTIGMEM */
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+#ifdef CONFIG_MIPS64
+        /* Switch from KSEG0 to XKPHYS addresses */
+        start = (unsigned long)phys_to_virt(CPHYSADDR(start));
+        end = (unsigned long)phys_to_virt(CPHYSADDR(end));
+#endif
+        if (start < end)
+                printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
+                       (end - start) >> 10);
+
+        for (; start < end; start += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(start));
+                set_page_count(virt_to_page(start), 1);
+                free_page(start);
+                totalram_pages++;
+        }
+}
+#endif
+
+extern unsigned long prom_free_prom_memory(void);
+
+void free_initmem(void)
+{
+        unsigned long addr, page, freed;
+
+        freed = prom_free_prom_memory();
+
+        addr = (unsigned long) &__init_begin;
+        while (addr < (unsigned long) &__init_end) {
+#ifdef CONFIG_MIPS64
+                page = PAGE_OFFSET | CPHYSADDR(addr);
+#else
+                page = addr;
+#endif
+                ClearPageReserved(virt_to_page(page));
+                set_page_count(virt_to_page(page), 1);
+                free_page(page);
+                totalram_pages++;
+                freed += PAGE_SIZE;
+                addr += PAGE_SIZE;
+        }
+        printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
+               freed >> 10);
+}