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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, 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/export.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/maar.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>
- #include <asm/maar.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));
- preempt_disable();
- 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_XPA)
- entrylo = pte_to_entrylo(pte.pte_high);
- #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
- 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
- if (cpu_has_xpa) {
- entrylo = (pte.pte_low & _PFNX_MASK);
- writex_c0_entrylo0(entrylo);
- writex_c0_entrylo1(entrylo);
- }
- #endif
- tlbidx = num_wired_entries();
- 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 = num_wired_entries() - 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();
- preempt_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_mapcount(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_mapcount(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)
- 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_mapcount(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
- }
- unsigned __weak platform_maar_init(unsigned num_pairs)
- {
- struct maar_config cfg[BOOT_MEM_MAP_MAX];
- unsigned i, num_configured, num_cfg = 0;
- for (i = 0; i < boot_mem_map.nr_map; i++) {
- switch (boot_mem_map.map[i].type) {
- case BOOT_MEM_RAM:
- case BOOT_MEM_INIT_RAM:
- break;
- default:
- continue;
- }
- /* Round lower up */
- cfg[num_cfg].lower = boot_mem_map.map[i].addr;
- cfg[num_cfg].lower = (cfg[num_cfg].lower + 0xffff) & ~0xffff;
- /* Round upper down */
- cfg[num_cfg].upper = boot_mem_map.map[i].addr +
- boot_mem_map.map[i].size;
- cfg[num_cfg].upper = (cfg[num_cfg].upper & ~0xffff) - 1;
- cfg[num_cfg].attrs = MIPS_MAAR_S;
- num_cfg++;
- }
- num_configured = maar_config(cfg, num_cfg, num_pairs);
- if (num_configured < num_cfg)
- pr_warn("Not enough MAAR pairs (%u) for all bootmem regions (%u)\n",
- num_pairs, num_cfg);
- return num_configured;
- }
- void maar_init(void)
- {
- unsigned num_maars, used, i;
- phys_addr_t lower, upper, attr;
- static struct {
- struct maar_config cfgs[3];
- unsigned used;
- } recorded = { { { 0 } }, 0 };
- 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);
- /* Set MAARs using values we recorded already */
- if (recorded.used) {
- used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
- BUG_ON(used != recorded.used);
- } else {
- /* 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();
- }
- if (recorded.used)
- return;
- pr_info("MAAR configuration:\n");
- for (i = 0; i < num_maars; i += 2) {
- write_c0_maari(i);
- back_to_back_c0_hazard();
- upper = read_c0_maar();
- write_c0_maari(i + 1);
- back_to_back_c0_hazard();
- lower = read_c0_maar();
- attr = lower & upper;
- lower = (lower & MIPS_MAAR_ADDR) << 4;
- upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
- pr_info(" [%d]: ", i / 2);
- if (!(attr & MIPS_MAAR_V)) {
- pr_cont("disabled\n");
- continue;
- }
- pr_cont("%pa-%pa", &lower, &upper);
- if (attr & MIPS_MAAR_S)
- pr_cont(" speculate");
- pr_cont("\n");
- /* Record the setup for use on secondary CPUs */
- if (used <= ARRAY_SIZE(recorded.cfgs)) {
- recorded.cfgs[recorded.used].lower = lower;
- recorded.cfgs[recorded.used].upper = upper;
- recorded.cfgs[recorded.used].attrs = attr;
- recorded.used++;
- }
- }
- }
- #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;
- if (cpu_has_dc_aliases)
- return;
- 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
- }
- 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 __ref 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;
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