init.c

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/*
 * 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, [email protected] and Carsten Langgaard, [email protected]
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/bug.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/smp.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 <linux/proc_fs.h>
#include <linux/pfn.h>
#include <linux/hardirq.h>
#include <linux/gfp.h>

#include <asm/asm-offsets.h>
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/kmap_types.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#include <asm/fixmap.h>

/* Atomicity and interruptability */
#ifdef CONFIG_MIPS_MT_SMTC

#include <asm/mipsmtregs.h>

#define ENTER_CRITICAL(flags) \
    { \
    unsigned int mvpflags; \
    local_irq_save(flags);\
    mvpflags = dvpe()
#define EXIT_CRITICAL(flags) \
    evpe(mvpflags); \
    local_irq_restore(flags); \
    }
#else

#define ENTER_CRITICAL(flags) local_irq_save(flags)
#define EXIT_CRITICAL(flags) local_irq_restore(flags)

#endif /* CONFIG_MIPS_MT_SMTC */

/*
 * 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;
EXPORT_SYMBOL_GPL(empty_zero_page);

/*
 * Not static inline because used by IP27 special magic initialization code
 */
unsigned long setup_zero_pages(void)
{
    unsigned int order;
    unsigned long 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((void *)empty_zero_page);
    split_page(page, order);
    while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
        SetPageReserved(page);
        page++;
    }

    size = PAGE_SIZE << order;
    zero_page_mask = (size - 1) & PAGE_MASK;

    return 1UL << order;
}

#ifdef CONFIG_MIPS_MT_SMTC
static pte_t *kmap_coherent_pte;
static void __init kmap_coherent_init(void)
{
    unsigned long vaddr;

    /* cache the first coherent kmap pte */
    vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
    kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
}
#else
static inline void kmap_coherent_init(void) {}
#endif

void *kmap_coherent(struct page *page, unsigned long addr)
{
    enum fixed_addresses idx;
    unsigned long vaddr, flags, entrylo;
    unsigned long old_ctx;
    pte_t pte;
    int tlbidx;

    BUG_ON(Page_dcache_dirty(page));

    inc_preempt_count();
    idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
#ifdef CONFIG_MIPS_MT_SMTC
    idx += FIX_N_COLOURS * smp_processor_id() +
        (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
#else
    idx += in_interrupt() ? FIX_N_COLOURS : 0;
#endif
    vaddr = __fix_to_virt(FIX_CMAP_END - idx);
    pte = mk_pte(page, PAGE_KERNEL);
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
    entrylo = pte.pte_high;
#else
    entrylo = pte_to_entrylo(pte_val(pte));
#endif

    ENTER_CRITICAL(flags);
    old_ctx = read_c0_entryhi();
    write_c0_entryhi(vaddr & (PAGE_MASK << 1));
    write_c0_entrylo0(entrylo);
    write_c0_entrylo1(entrylo);
#ifdef CONFIG_MIPS_MT_SMTC
    set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
    /* preload TLB instead of local_flush_tlb_one() */
    mtc0_tlbw_hazard();
    tlb_probe();
    tlb_probe_hazard();
    tlbidx = read_c0_index();
    mtc0_tlbw_hazard();
    if (tlbidx < 0)
        tlb_write_random();
    else
        tlb_write_indexed();
#else
    tlbidx = read_c0_wired();
    write_c0_wired(tlbidx + 1);
    write_c0_index(tlbidx);
    mtc0_tlbw_hazard();
    tlb_write_indexed();
#endif
    tlbw_use_hazard();
    write_c0_entryhi(old_ctx);
    EXIT_CRITICAL(flags);

    return (void*) vaddr;
}

#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))

void kunmap_coherent(void)
{
#ifndef CONFIG_MIPS_MT_SMTC
    unsigned int wired;
    unsigned long flags, old_ctx;

    ENTER_CRITICAL(flags);
    old_ctx = read_c0_entryhi();
    wired = read_c0_wired() - 1;
    write_c0_wired(wired);
    write_c0_index(wired);
    write_c0_entryhi(UNIQUE_ENTRYHI(wired));
    write_c0_entrylo0(0);
    write_c0_entrylo1(0);
    mtc0_tlbw_hazard();
    tlb_write_indexed();
    tlbw_use_hazard();
    write_c0_entryhi(old_ctx);
    EXIT_CRITICAL(flags);
#endif
    dec_preempt_count();
    preempt_check_resched();
}

void copy_user_highpage(struct page *to, struct page *from,
    unsigned long vaddr, struct vm_area_struct *vma)
{
    void *vfrom, *vto;

    vto = kmap_atomic(to);
    if (cpu_has_dc_aliases &&
        page_mapped(from) && !Page_dcache_dirty(from)) {
        vfrom = kmap_coherent(from, vaddr);
        copy_page(vto, vfrom);
        kunmap_coherent();
    } else {
        vfrom = kmap_atomic(from);
        copy_page(vto, vfrom);
        kunmap_atomic(vfrom);
    }
    if ((!cpu_has_ic_fills_f_dc) ||
        pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
        flush_data_cache_page((unsigned long)vto);
    kunmap_atomic(vto);
    /* Make sure this page is cleared on other CPU's too before using it */
    smp_wmb();
}

void copy_to_user_page(struct vm_area_struct *vma,
    struct page *page, unsigned long vaddr, void *dst, const void *src,
    unsigned long len)
{
    if (cpu_has_dc_aliases &&
        page_mapped(page) && !Page_dcache_dirty(page)) {
        void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
        memcpy(vto, src, len);
        kunmap_coherent();
    } else {
        memcpy(dst, src, len);
        if (cpu_has_dc_aliases)
            SetPageDcacheDirty(page);
    }
    if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
        flush_cache_page(vma, vaddr, page_to_pfn(page));
}

void copy_from_user_page(struct vm_area_struct *vma,
    struct page *page, unsigned long vaddr, void *dst, const void *src,
    unsigned long len)
{
    if (cpu_has_dc_aliases &&
        page_mapped(page) && !Page_dcache_dirty(page)) {
        void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
        memcpy(dst, vfrom, len);
        kunmap_coherent();
    } else {
        memcpy(dst, src, len);
        if (cpu_has_dc_aliases)
            SetPageDcacheDirty(page);
    }
}

void __init fixrange_init(unsigned long start, unsigned long end,
    pgd_t *pgd_base)
{
#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
    pgd_t *pgd;
    pud_t *pud;
    pmd_t *pmd;
    pte_t *pte;
    int i, j, k;
    unsigned long vaddr;

    vaddr = start;
    i = __pgd_offset(vaddr);
    j = __pud_offset(vaddr);
    k = __pmd_offset(vaddr);
    pgd = pgd_base + i;

    for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
        pud = (pud_t *)pgd;
        for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
            pmd = (pmd_t *)pud;
            for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
                if (pmd_none(*pmd)) {
                    pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
                    set_pmd(pmd, __pmd((unsigned long)pte));
                    BUG_ON(pte != pte_offset_kernel(pmd, 0));
                }
                vaddr += PMD_SIZE;
            }
            k = 0;
        }
        j = 0;
    }
#endif
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
int page_is_ram(unsigned long pagenr)
{
    int i;

    for (i = 0; i < boot_mem_map.nr_map; i++) {
        unsigned long addr, end;

        switch (boot_mem_map.map[i].type) {
        case BOOT_MEM_RAM:
        case BOOT_MEM_INIT_RAM:
            break;
        default:
            /* 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 paging_init(void)
{
    unsigned long max_zone_pfns[MAX_NR_ZONES];
    unsigned long lastpfn __maybe_unused;

    pagetable_init();

#ifdef CONFIG_HIGHMEM
    kmap_init();
#endif
    kmap_coherent_init();

#ifdef CONFIG_ZONE_DMA
    max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
#endif
#ifdef CONFIG_ZONE_DMA32
    max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
#endif
    max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
    lastpfn = max_low_pfn;
#ifdef CONFIG_HIGHMEM
    max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
    lastpfn = highend_pfn;

    if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
        printk(KERN_WARNING "This processor doesn't support highmem."
               " %ldk highmem ignored\n",
               (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
        max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
        lastpfn = max_low_pfn;
    }
#endif

    free_area_init_nodes(max_zone_pfns);
}

#ifdef CONFIG_64BIT
static struct kcore_list kcore_kseg0;
#endif

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 = highend_pfn ? highend_pfn : max_low_pfn;
#else
    max_mapnr = 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) && pfn_valid(tmp)) {
            ram++;
            if (PageReserved(pfn_to_page(tmp)))
                reservedpages++;
        }
    num_physpages = ram;

#ifdef CONFIG_HIGHMEM
    for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
        struct page *page = pfn_to_page(tmp);

        if (!page_is_ram(tmp)) {
            SetPageReserved(page);
            continue;
        }
        ClearPageReserved(page);
        init_page_count(page);
        __free_page(page);
        totalhigh_pages++;
    }
    totalram_pages += totalhigh_pages;
    num_physpages += 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;

#ifdef CONFIG_64BIT
    if ((unsigned long) &_text > (unsigned long) CKSEG0)
        /* The -4 is a hack so that user tools don't have to handle
           the overflow.  */
        kclist_add(&kcore_kseg0, (void *) CKSEG0,
                0x80000000 - 4, KCORE_TEXT);
#endif

    printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
           "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
           nr_free_pages() << (PAGE_SHIFT-10),
           ram << (PAGE_SHIFT-10),
           codesize >> 10,
           reservedpages << (PAGE_SHIFT-10),
           datasize >> 10,
           initsize >> 10,
           totalhigh_pages << (PAGE_SHIFT-10));
}
#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void free_init_pages(const char *what, unsigned long begin, unsigned long end)
{
    unsigned long pfn;

    for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
        struct page *page = pfn_to_page(pfn);
        void *addr = phys_to_virt(PFN_PHYS(pfn));

        ClearPageReserved(page);
        init_page_count(page);
        memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
        __free_page(page);
        totalram_pages++;
    }
    printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
    free_init_pages("initrd memory",
            virt_to_phys((void *)start),
            virt_to_phys((void *)end));
}
#endif

void __init_refok free_initmem(void)
{
    prom_free_prom_memory();
    free_init_pages("unused kernel memory",
            __pa_symbol(&__init_begin),
            __pa_symbol(&__init_end));
}

#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
unsigned long pgd_current[NR_CPUS];
#endif

/*
 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
 * are constants.  So we use the variants from asm-offset.h until that gcc
 * will officially be retired.
 *
 * Align swapper_pg_dir in to 64K, allows its address to be loaded
 * with a single LUI instruction in the TLB handlers.  If we used
 * __aligned(64K), its size would get rounded up to the alignment
 * size, and waste space.  So we place it in its own section and align
 * it in the linker script.
 */
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
#ifndef __PAGETABLE_PMD_FOLDED
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;