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Diffstat (limited to 'arch/mips/mm/init.c')
| -rw-r--r-- | arch/mips/mm/init.c | 451 |
1 files changed, 451 insertions, 0 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c new file mode 100644 index 000000000..faa5c9822 --- /dev/null +++ b/arch/mips/mm/init.c @@ -0,0 +1,451 @@ +/* + * 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/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 <linux/kcore.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> + +/* + * 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); +EXPORT_SYMBOL(zero_page_mask); + +/* + * Not static inline because used by IP27 special magic initialization code + */ +void setup_zero_pages(void) +{ + unsigned int order, i; + 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); + for (i = 0; i < (1 << order); i++, page++) + mark_page_reserved(page); + + zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; +} + +static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot) +{ + enum fixed_addresses idx; + unsigned long vaddr, flags, entrylo; + unsigned long old_ctx; + pte_t pte; + int tlbidx; + + BUG_ON(Page_dcache_dirty(page)); + + pagefault_disable(); + idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); + idx += in_interrupt() ? FIX_N_COLOURS : 0; + vaddr = __fix_to_virt(FIX_CMAP_END - idx); + pte = mk_pte(page, prot); +#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) + entrylo = pte_to_entrylo(pte.pte_high); +#else + entrylo = pte_to_entrylo(pte_val(pte)); +#endif + + local_irq_save(flags); + old_ctx = read_c0_entryhi(); + write_c0_entryhi(vaddr & (PAGE_MASK << 1)); + write_c0_entrylo0(entrylo); + write_c0_entrylo1(entrylo); +#ifdef CONFIG_XPA + entrylo = (pte.pte_low & _PFNX_MASK); + writex_c0_entrylo0(entrylo); + writex_c0_entrylo1(entrylo); +#endif + tlbidx = read_c0_wired(); + write_c0_wired(tlbidx + 1); + write_c0_index(tlbidx); + mtc0_tlbw_hazard(); + tlb_write_indexed(); + tlbw_use_hazard(); + write_c0_entryhi(old_ctx); + local_irq_restore(flags); + + return (void*) vaddr; +} + +void *kmap_coherent(struct page *page, unsigned long addr) +{ + return __kmap_pgprot(page, addr, PAGE_KERNEL); +} + +void *kmap_noncoherent(struct page *page, unsigned long addr) +{ + return __kmap_pgprot(page, addr, PAGE_KERNEL_NC); +} + +void kunmap_coherent(void) +{ + unsigned int wired; + unsigned long flags, old_ctx; + + local_irq_save(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); + local_irq_restore(flags); + pagefault_enable(); +} + +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); + } +} +EXPORT_SYMBOL_GPL(copy_from_user_page); + +void __init fixrange_init(unsigned long start, unsigned long end, + pgd_t *pgd_base) +{ +#ifdef CONFIG_HIGHMEM + 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 +#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 + +static inline void mem_init_free_highmem(void) +{ +#ifdef CONFIG_HIGHMEM + unsigned long tmp; + + for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { + struct page *page = pfn_to_page(tmp); + + if (!page_is_ram(tmp)) + SetPageReserved(page); + else + free_highmem_page(page); + } +#endif +} + +unsigned __weak platform_maar_init(unsigned num_maars) +{ + return 0; +} + +static void maar_init(void) +{ + unsigned num_maars, used, i; + + if (!cpu_has_maar) + return; + + /* Detect the number of MAARs */ + write_c0_maari(~0); + back_to_back_c0_hazard(); + num_maars = read_c0_maari() + 1; + + /* MAARs should be in pairs */ + WARN_ON(num_maars % 2); + + /* Configure the required MAARs */ + used = platform_maar_init(num_maars / 2); + + /* Disable any further MAARs */ + for (i = (used * 2); i < num_maars; i++) { + write_c0_maari(i); + back_to_back_c0_hazard(); + write_c0_maar(0); + back_to_back_c0_hazard(); + } +} + +void __init mem_init(void) +{ +#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); + + maar_init(); + free_all_bootmem(); + setup_zero_pages(); /* Setup zeroed pages. */ + mem_init_free_highmem(); + mem_init_print_info(NULL); + +#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 +} +#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)); + + memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); + free_reserved_page(page); + } + 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_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, + "initrd"); +} +#endif + +void (*free_init_pages_eva)(void *begin, void *end) = NULL; + +void __init_refok free_initmem(void) +{ + prom_free_prom_memory(); + /* + * Let the platform define a specific function to free the + * init section since EVA may have used any possible mapping + * between virtual and physical addresses. + */ + if (free_init_pages_eva) + free_init_pages_eva((void *)&__init_begin, (void *)&__init_end); + else + free_initmem_default(POISON_FREE_INITMEM); +} + +#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; |