296 lines
7.1 KiB
C
296 lines
7.1 KiB
C
/*
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* linux/arch/sh/mm/init.c
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 - 2007 Paul Mundt
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*
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* Based on linux/arch/i386/mm/init.c:
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/proc_fs.h>
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#include <linux/pagemap.h>
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#include <linux/percpu.h>
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#include <linux/io.h>
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#include <asm/mmu_context.h>
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#include <asm/tlb.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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#include <asm/cache.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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pgd_t swapper_pg_dir[PTRS_PER_PGD];
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unsigned long cached_to_uncached = 0;
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#ifdef CONFIG_MMU
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static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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pgd = pgd_offset_k(addr);
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if (pgd_none(*pgd)) {
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pgd_ERROR(*pgd);
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return;
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}
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pud = pud_alloc(NULL, pgd, addr);
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if (unlikely(!pud)) {
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pud_ERROR(*pud);
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return;
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}
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pmd = pmd_alloc(NULL, pud, addr);
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if (unlikely(!pmd)) {
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pmd_ERROR(*pmd);
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return;
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}
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pte = pte_offset_kernel(pmd, addr);
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if (!pte_none(*pte)) {
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pte_ERROR(*pte);
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return;
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}
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set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
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if (cached_to_uncached)
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flush_tlb_one(get_asid(), addr);
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}
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/*
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* As a performance optimization, other platforms preserve the fixmap mapping
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* across a context switch, we don't presently do this, but this could be done
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* in a similar fashion as to the wired TLB interface that sh64 uses (by way
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* of the memory mapped UTLB configuration) -- this unfortunately forces us to
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* give up a TLB entry for each mapping we want to preserve. While this may be
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* viable for a small number of fixmaps, it's not particularly useful for
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* everything and needs to be carefully evaluated. (ie, we may want this for
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* the vsyscall page).
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*
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* XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
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* in at __set_fixmap() time to determine the appropriate behavior to follow.
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*
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* -- PFM.
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*/
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void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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BUG();
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return;
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}
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set_pte_phys(address, phys, prot);
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}
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void __init page_table_range_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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pud_t *pud;
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pmd_t *pmd;
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int pgd_idx;
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unsigned long vaddr;
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vaddr = start & PMD_MASK;
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end = (end + PMD_SIZE - 1) & PMD_MASK;
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pgd_idx = pgd_index(vaddr);
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pgd = pgd_base + pgd_idx;
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for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
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BUG_ON(pgd_none(*pgd));
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pud = pud_offset(pgd, 0);
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BUG_ON(pud_none(*pud));
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pmd = pmd_offset(pud, 0);
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if (!pmd_present(*pmd)) {
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pte_t *pte_table;
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pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
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memset(pte_table, 0, PAGE_SIZE);
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pmd_populate_kernel(&init_mm, pmd, pte_table);
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}
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vaddr += PMD_SIZE;
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}
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}
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#endif /* CONFIG_MMU */
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/*
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* paging_init() sets up the page tables
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*/
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void __init paging_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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int nid;
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/* We don't need to map the kernel through the TLB, as
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* it is permanatly mapped using P1. So clear the
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* entire pgd. */
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memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
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/* Set an initial value for the MMU.TTB so we don't have to
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* check for a null value. */
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set_TTB(swapper_pg_dir);
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/* Populate the relevant portions of swapper_pg_dir so that
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* we can use the fixmap entries without calling kmalloc.
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* pte's will be filled in by __set_fixmap(). */
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page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir);
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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for_each_online_node(nid) {
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pg_data_t *pgdat = NODE_DATA(nid);
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unsigned long low, start_pfn;
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start_pfn = pgdat->bdata->node_min_pfn;
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low = pgdat->bdata->node_low_pfn;
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if (max_zone_pfns[ZONE_NORMAL] < low)
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max_zone_pfns[ZONE_NORMAL] = low;
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printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
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nid, start_pfn, low);
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}
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free_area_init_nodes(max_zone_pfns);
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#ifdef CONFIG_SUPERH32
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/* Set up the uncached fixmap */
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set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
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#ifdef CONFIG_29BIT
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/*
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* Handle trivial transitions between cached and uncached
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* segments, making use of the 1:1 mapping relationship in
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* 512MB lowmem.
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*/
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cached_to_uncached = P2SEG - P1SEG;
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#endif
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#endif
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}
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static struct kcore_list kcore_mem, kcore_vmalloc;
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int after_bootmem = 0;
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void __init mem_init(void)
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{
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int codesize, datasize, initsize;
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int nid;
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num_physpages = 0;
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high_memory = NULL;
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for_each_online_node(nid) {
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pg_data_t *pgdat = NODE_DATA(nid);
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unsigned long node_pages = 0;
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void *node_high_memory;
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num_physpages += pgdat->node_present_pages;
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if (pgdat->node_spanned_pages)
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node_pages = free_all_bootmem_node(pgdat);
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totalram_pages += node_pages;
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node_high_memory = (void *)__va((pgdat->node_start_pfn +
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pgdat->node_spanned_pages) <<
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PAGE_SHIFT);
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if (node_high_memory > high_memory)
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high_memory = node_high_memory;
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}
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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__flush_wback_region(empty_zero_page, PAGE_SIZE);
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after_bootmem = 1;
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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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kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
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kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
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VMALLOC_END - VMALLOC_START);
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printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
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"%dk data, %dk init)\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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num_physpages << (PAGE_SHIFT-10),
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codesize >> 10,
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datasize >> 10,
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initsize >> 10);
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p3_cache_init();
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/* Initialize the vDSO */
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vsyscall_init();
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}
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
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}
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printk("Freeing unused kernel memory: %ldk freed\n",
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((unsigned long)&__init_end -
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(unsigned long)&__init_begin) >> 10);
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}
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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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unsigned long p;
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for (p = start; p < end; p += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(p));
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init_page_count(virt_to_page(p));
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free_page(p);
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totalram_pages++;
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}
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printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
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}
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#endif
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#ifdef CONFIG_MEMORY_HOTPLUG
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int arch_add_memory(int nid, u64 start, u64 size)
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{
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pg_data_t *pgdat;
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long nr_pages = size >> PAGE_SHIFT;
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int ret;
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pgdat = NODE_DATA(nid);
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/* We only have ZONE_NORMAL, so this is easy.. */
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ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
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if (unlikely(ret))
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printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(arch_add_memory);
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#ifdef CONFIG_NUMA
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int memory_add_physaddr_to_nid(u64 addr)
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{
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/* Node 0 for now.. */
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return 0;
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}
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EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
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#endif
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#endif
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