| /* |
| * 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/config.h> |
| #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 <asm/bootinfo.h> |
| #include <asm/cachectl.h> |
| #include <asm/cpu.h> |
| #include <asm/dma.h> |
| #include <asm/mmu_context.h> |
| #include <asm/sections.h> |
| #include <asm/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/tlb.h> |
| |
| 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 long order, 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(empty_zero_page); |
| while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) { |
| SetPageReserved(page); |
| set_page_count(page, 1); |
| page++; |
| } |
| |
| size = PAGE_SIZE << order; |
| zero_page_mask = (size - 1) & PAGE_MASK; |
| |
| return 1UL << order; |
| } |
| |
| #ifdef CONFIG_HIGHMEM |
| pte_t *kmap_pte; |
| pgprot_t kmap_prot; |
| |
| #define kmap_get_fixmap_pte(vaddr) \ |
| pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) |
| |
| 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; |
| } |
| |
| #ifdef CONFIG_32BIT |
| void __init fixrange_init(unsigned long start, unsigned long end, |
| pgd_t *pgd_base) |
| { |
| 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(pte)); |
| if (pte != pte_offset_kernel(pmd, 0)) |
| BUG(); |
| } |
| vaddr += PMD_SIZE; |
| } |
| k = 0; |
| } |
| j = 0; |
| } |
| } |
| #endif /* CONFIG_32BIT */ |
| #endif /* CONFIG_HIGHMEM */ |
| |
| #ifndef CONFIG_NEED_MULTIPLE_NODES |
| extern void pagetable_init(void); |
| |
| void __init paging_init(void) |
| { |
| unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; |
| unsigned long max_dma, high, low; |
| |
| pagetable_init(); |
| |
| #ifdef CONFIG_HIGHMEM |
| kmap_init(); |
| #endif |
| |
| max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; |
| low = max_low_pfn; |
| high = highend_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 |
| if (cpu_has_dc_aliases) { |
| printk(KERN_WARNING "This processor doesn't support highmem."); |
| if (high - low) |
| printk(" %ldk highmem ignored", high - low); |
| printk("\n"); |
| } else |
| zones_size[ZONE_HIGHMEM] = high - low; |
| #endif |
| |
| free_area_init(zones_size); |
| } |
| |
| #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT) |
| #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) |
| |
| static inline int 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 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 = num_physpages = highend_pfn; |
| #else |
| max_mapnr = num_physpages = 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(mem_map+tmp)) |
| reservedpages++; |
| } |
| |
| #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 |
| set_page_count(page, 1); |
| __free_page(page); |
| totalhigh_pages++; |
| } |
| totalram_pages += 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; |
| |
| 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 */ |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| #ifdef CONFIG_64BIT |
| /* Switch from KSEG0 to XKPHYS addresses */ |
| start = (unsigned long)phys_to_virt(CPHYSADDR(start)); |
| end = (unsigned long)phys_to_virt(CPHYSADDR(end)); |
| #endif |
| if (start < end) |
| printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", |
| (end - start) >> 10); |
| |
| for (; start < end; start += PAGE_SIZE) { |
| ClearPageReserved(virt_to_page(start)); |
| set_page_count(virt_to_page(start), 1); |
| free_page(start); |
| totalram_pages++; |
| } |
| } |
| #endif |
| |
| extern unsigned long prom_free_prom_memory(void); |
| |
| void free_initmem(void) |
| { |
| unsigned long addr, page, freed; |
| |
| freed = prom_free_prom_memory(); |
| |
| addr = (unsigned long) &__init_begin; |
| while (addr < (unsigned long) &__init_end) { |
| #ifdef CONFIG_64BIT |
| page = PAGE_OFFSET | CPHYSADDR(addr); |
| #else |
| page = addr; |
| #endif |
| ClearPageReserved(virt_to_page(page)); |
| set_page_count(virt_to_page(page), 1); |
| free_page(page); |
| totalram_pages++; |
| freed += PAGE_SIZE; |
| addr += PAGE_SIZE; |
| } |
| printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n", |
| freed >> 10); |
| } |