| /* |
| * 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/init.h> |
| #include <linux/module.h> |
| #include <linux/signal.h> |
| #include <linux/sched.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 <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 */ |
| |
| DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| |
| unsigned long highstart_pfn, highend_pfn; |
| |
| /* |
| * 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; |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * These are almost like kmap_atomic / kunmap_atmic except they take an |
| * additional address argument as the hint. |
| */ |
| |
| #define kmap_get_fixmap_pte(vaddr) \ |
| pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) |
| |
| #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 |
| |
| static inline 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; |
| |
| inc_preempt_count(); |
| idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); |
| #ifdef CONFIG_MIPS_MT_SMTC |
| idx += FIX_N_COLOURS * smp_processor_id(); |
| #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_R1) |
| entrylo = pte.pte_high; |
| #else |
| entrylo = pte_val(pte) >> 6; |
| #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))) |
| |
| static inline void kunmap_coherent(struct page *page) |
| { |
| #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_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) { |
| void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
| memcpy(vto, src, len); |
| kunmap_coherent(page); |
| } else |
| memcpy(dst, src, len); |
| if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) |
| flush_cache_page(vma, vaddr, page_to_pfn(page)); |
| } |
| |
| EXPORT_SYMBOL(copy_to_user_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) { |
| void *vfrom = |
| kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
| memcpy(dst, vfrom, len); |
| kunmap_coherent(page); |
| } else |
| memcpy(dst, src, len); |
| } |
| |
| EXPORT_SYMBOL(copy_from_user_page); |
| |
| |
| #ifdef CONFIG_HIGHMEM |
| pte_t *kmap_pte; |
| pgprot_t kmap_prot; |
| |
| static void __init kmap_init(void) |
| { |
| unsigned long kmap_vstart; |
| |
| /* cache the first kmap pte */ |
| kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
| kmap_pte = kmap_get_fixmap_pte(kmap_vstart); |
| |
| kmap_prot = PAGE_KERNEL; |
| } |
| #endif /* CONFIG_HIGHMEM */ |
| |
| 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)); |
| if (pte != pte_offset_kernel(pmd, 0)) |
| BUG(); |
| } |
| vaddr += PMD_SIZE; |
| } |
| k = 0; |
| } |
| j = 0; |
| } |
| #endif |
| } |
| |
| #ifndef CONFIG_NEED_MULTIPLE_NODES |
| extern void pagetable_init(void); |
| |
| static int __init page_is_ram(unsigned long pagenr) |
| { |
| int i; |
| |
| for (i = 0; i < boot_mem_map.nr_map; i++) { |
| unsigned long addr, end; |
| |
| if (boot_mem_map.map[i].type != BOOT_MEM_RAM) |
| /* 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 zones_size[MAX_NR_ZONES] = { 0, }; |
| unsigned long max_dma, low; |
| #ifndef CONFIG_FLATMEM |
| unsigned long zholes_size[MAX_NR_ZONES] = { 0, }; |
| unsigned long i, j, pfn; |
| #endif |
| |
| pagetable_init(); |
| |
| #ifdef CONFIG_HIGHMEM |
| kmap_init(); |
| #endif |
| kmap_coherent_init(); |
| |
| max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; |
| low = max_low_pfn; |
| |
| #ifdef CONFIG_ISA |
| if (low < max_dma) |
| zones_size[ZONE_DMA] = low; |
| else { |
| zones_size[ZONE_DMA] = max_dma; |
| zones_size[ZONE_NORMAL] = low - max_dma; |
| } |
| #else |
| zones_size[ZONE_DMA] = low; |
| #endif |
| #ifdef CONFIG_HIGHMEM |
| zones_size[ZONE_HIGHMEM] = highend_pfn - highstart_pfn; |
| |
| if (cpu_has_dc_aliases && zones_size[ZONE_HIGHMEM]) { |
| printk(KERN_WARNING "This processor doesn't support highmem." |
| " %ldk highmem ignored\n", zones_size[ZONE_HIGHMEM]); |
| zones_size[ZONE_HIGHMEM] = 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_FLATMEM |
| free_area_init(zones_size); |
| #else |
| pfn = 0; |
| for (i = 0; i < MAX_NR_ZONES; i++) |
| for (j = 0; j < zones_size[i]; j++, pfn++) |
| if (!page_is_ram(pfn)) |
| zholes_size[i]++; |
| free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size); |
| #endif |
| } |
| |
| static struct kcore_list kcore_mem, kcore_vmalloc; |
| #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; |
| #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)) { |
| 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 = mem_map + tmp; |
| |
| if (!page_is_ram(tmp)) { |
| SetPageReserved(page); |
| continue; |
| } |
| ClearPageReserved(page); |
| #ifdef CONFIG_LIMITED_DMA |
| set_page_address(page, lowmem_page_address(page)); |
| #endif |
| 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); |
| #endif |
| kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
| VMALLOC_END-VMALLOC_START); |
| |
| printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
| "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", |
| (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| ram << (PAGE_SHIFT-10), |
| codesize >> 10, |
| reservedpages << (PAGE_SHIFT-10), |
| datasize >> 10, |
| initsize >> 10, |
| (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); |
| } |
| #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
| |
| static void free_init_pages(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 |
| |
| extern unsigned long prom_free_prom_memory(void); |
| |
| void free_initmem(void) |
| { |
| unsigned long freed; |
| |
| freed = prom_free_prom_memory(); |
| if (freed) |
| printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed); |
| |
| free_init_pages("unused kernel memory", |
| __pa_symbol(&__init_begin), |
| __pa_symbol(&__init_end)); |
| } |