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