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 0000000..b027ce7
--- /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);
+}