diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/mm/init.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/mm/init.c | 416 |
1 files changed, 0 insertions, 416 deletions
diff --git a/ANDROID_3.4.5/arch/x86/mm/init.c b/ANDROID_3.4.5/arch/x86/mm/init.c deleted file mode 100644 index 4f0cec7e..00000000 --- a/ANDROID_3.4.5/arch/x86/mm/init.c +++ /dev/null @@ -1,416 +0,0 @@ -#include <linux/gfp.h> -#include <linux/initrd.h> -#include <linux/ioport.h> -#include <linux/swap.h> -#include <linux/memblock.h> -#include <linux/bootmem.h> /* for max_low_pfn */ - -#include <asm/cacheflush.h> -#include <asm/e820.h> -#include <asm/init.h> -#include <asm/page.h> -#include <asm/page_types.h> -#include <asm/sections.h> -#include <asm/setup.h> -#include <asm/tlbflush.h> -#include <asm/tlb.h> -#include <asm/proto.h> -#include <asm/dma.h> /* for MAX_DMA_PFN */ - -unsigned long __initdata pgt_buf_start; -unsigned long __meminitdata pgt_buf_end; -unsigned long __meminitdata pgt_buf_top; - -int after_bootmem; - -int direct_gbpages -#ifdef CONFIG_DIRECT_GBPAGES - = 1 -#endif -; - -static void __init find_early_table_space(unsigned long end, int use_pse, - int use_gbpages) -{ - unsigned long puds, pmds, ptes, tables, start = 0, good_end = end; - phys_addr_t base; - - puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; - tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); - - if (use_gbpages) { - unsigned long extra; - - extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); - pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; - } else - pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; - - tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); - - if (use_pse) { - unsigned long extra; - - extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); -#ifdef CONFIG_X86_32 - extra += PMD_SIZE; -#endif - ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; - } else - ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; - - tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); - -#ifdef CONFIG_X86_32 - /* for fixmap */ - tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE); -#endif - good_end = max_pfn_mapped << PAGE_SHIFT; - - base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE); - if (!base) - panic("Cannot find space for the kernel page tables"); - - pgt_buf_start = base >> PAGE_SHIFT; - pgt_buf_end = pgt_buf_start; - pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT); - - printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", - end, pgt_buf_start << PAGE_SHIFT, pgt_buf_top << PAGE_SHIFT); -} - -void __init native_pagetable_reserve(u64 start, u64 end) -{ - memblock_reserve(start, end - start); -} - -struct map_range { - unsigned long start; - unsigned long end; - unsigned page_size_mask; -}; - -#ifdef CONFIG_X86_32 -#define NR_RANGE_MR 3 -#else /* CONFIG_X86_64 */ -#define NR_RANGE_MR 5 -#endif - -static int __meminit save_mr(struct map_range *mr, int nr_range, - unsigned long start_pfn, unsigned long end_pfn, - unsigned long page_size_mask) -{ - if (start_pfn < end_pfn) { - if (nr_range >= NR_RANGE_MR) - panic("run out of range for init_memory_mapping\n"); - mr[nr_range].start = start_pfn<<PAGE_SHIFT; - mr[nr_range].end = end_pfn<<PAGE_SHIFT; - mr[nr_range].page_size_mask = page_size_mask; - nr_range++; - } - - return nr_range; -} - -/* - * Setup the direct mapping of the physical memory at PAGE_OFFSET. - * This runs before bootmem is initialized and gets pages directly from - * the physical memory. To access them they are temporarily mapped. - */ -unsigned long __init_refok init_memory_mapping(unsigned long start, - unsigned long end) -{ - unsigned long page_size_mask = 0; - unsigned long start_pfn, end_pfn; - unsigned long ret = 0; - unsigned long pos; - - struct map_range mr[NR_RANGE_MR]; - int nr_range, i; - int use_pse, use_gbpages; - - printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); - -#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) - /* - * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. - * This will simplify cpa(), which otherwise needs to support splitting - * large pages into small in interrupt context, etc. - */ - use_pse = use_gbpages = 0; -#else - use_pse = cpu_has_pse; - use_gbpages = direct_gbpages; -#endif - - /* Enable PSE if available */ - if (cpu_has_pse) - set_in_cr4(X86_CR4_PSE); - - /* Enable PGE if available */ - if (cpu_has_pge) { - set_in_cr4(X86_CR4_PGE); - __supported_pte_mask |= _PAGE_GLOBAL; - } - - if (use_gbpages) - page_size_mask |= 1 << PG_LEVEL_1G; - if (use_pse) - page_size_mask |= 1 << PG_LEVEL_2M; - - memset(mr, 0, sizeof(mr)); - nr_range = 0; - - /* head if not big page alignment ? */ - start_pfn = start >> PAGE_SHIFT; - pos = start_pfn << PAGE_SHIFT; -#ifdef CONFIG_X86_32 - /* - * Don't use a large page for the first 2/4MB of memory - * because there are often fixed size MTRRs in there - * and overlapping MTRRs into large pages can cause - * slowdowns. - */ - if (pos == 0) - end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); - else - end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) - << (PMD_SHIFT - PAGE_SHIFT); -#else /* CONFIG_X86_64 */ - end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) - << (PMD_SHIFT - PAGE_SHIFT); -#endif - if (end_pfn > (end >> PAGE_SHIFT)) - end_pfn = end >> PAGE_SHIFT; - if (start_pfn < end_pfn) { - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); - pos = end_pfn << PAGE_SHIFT; - } - - /* big page (2M) range */ - start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) - << (PMD_SHIFT - PAGE_SHIFT); -#ifdef CONFIG_X86_32 - end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); -#else /* CONFIG_X86_64 */ - end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) - << (PUD_SHIFT - PAGE_SHIFT); - if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) - end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); -#endif - - if (start_pfn < end_pfn) { - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, - page_size_mask & (1<<PG_LEVEL_2M)); - pos = end_pfn << PAGE_SHIFT; - } - -#ifdef CONFIG_X86_64 - /* big page (1G) range */ - start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) - << (PUD_SHIFT - PAGE_SHIFT); - end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); - if (start_pfn < end_pfn) { - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, - page_size_mask & - ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); - pos = end_pfn << PAGE_SHIFT; - } - - /* tail is not big page (1G) alignment */ - start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) - << (PMD_SHIFT - PAGE_SHIFT); - end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); - if (start_pfn < end_pfn) { - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, - page_size_mask & (1<<PG_LEVEL_2M)); - pos = end_pfn << PAGE_SHIFT; - } -#endif - - /* tail is not big page (2M) alignment */ - start_pfn = pos>>PAGE_SHIFT; - end_pfn = end>>PAGE_SHIFT; - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); - - /* try to merge same page size and continuous */ - for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { - unsigned long old_start; - if (mr[i].end != mr[i+1].start || - mr[i].page_size_mask != mr[i+1].page_size_mask) - continue; - /* move it */ - old_start = mr[i].start; - memmove(&mr[i], &mr[i+1], - (nr_range - 1 - i) * sizeof(struct map_range)); - mr[i--].start = old_start; - nr_range--; - } - - for (i = 0; i < nr_range; i++) - printk(KERN_DEBUG " %010lx - %010lx page %s\n", - mr[i].start, mr[i].end, - (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( - (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); - - /* - * Find space for the kernel direct mapping tables. - * - * Later we should allocate these tables in the local node of the - * memory mapped. Unfortunately this is done currently before the - * nodes are discovered. - */ - if (!after_bootmem) - find_early_table_space(end, use_pse, use_gbpages); - - for (i = 0; i < nr_range; i++) - ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, - mr[i].page_size_mask); - -#ifdef CONFIG_X86_32 - early_ioremap_page_table_range_init(); - - load_cr3(swapper_pg_dir); -#endif - - __flush_tlb_all(); - - /* - * Reserve the kernel pagetable pages we used (pgt_buf_start - - * pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top) - * so that they can be reused for other purposes. - * - * On native it just means calling memblock_reserve, on Xen it also - * means marking RW the pagetable pages that we allocated before - * but that haven't been used. - * - * In fact on xen we mark RO the whole range pgt_buf_start - - * pgt_buf_top, because we have to make sure that when - * init_memory_mapping reaches the pagetable pages area, it maps - * RO all the pagetable pages, including the ones that are beyond - * pgt_buf_end at that time. - */ - if (!after_bootmem && pgt_buf_end > pgt_buf_start) - x86_init.mapping.pagetable_reserve(PFN_PHYS(pgt_buf_start), - PFN_PHYS(pgt_buf_end)); - - if (!after_bootmem) - early_memtest(start, end); - - return ret >> PAGE_SHIFT; -} - - -/* - * devmem_is_allowed() checks to see if /dev/mem access to a certain address - * is valid. The argument is a physical page number. - * - * - * On x86, access has to be given to the first megabyte of ram because that area - * contains bios code and data regions used by X and dosemu and similar apps. - * Access has to be given to non-kernel-ram areas as well, these contain the PCI - * mmio resources as well as potential bios/acpi data regions. - */ -int devmem_is_allowed(unsigned long pagenr) -{ - if (pagenr <= 256) - return 1; - if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) - return 0; - if (!page_is_ram(pagenr)) - return 1; - return 0; -} - -void free_init_pages(char *what, unsigned long begin, unsigned long end) -{ - unsigned long addr; - unsigned long begin_aligned, end_aligned; - - /* Make sure boundaries are page aligned */ - begin_aligned = PAGE_ALIGN(begin); - end_aligned = end & PAGE_MASK; - - if (WARN_ON(begin_aligned != begin || end_aligned != end)) { - begin = begin_aligned; - end = end_aligned; - } - - if (begin >= end) - return; - - addr = begin; - - /* - * If debugging page accesses then do not free this memory but - * mark them not present - any buggy init-section access will - * create a kernel page fault: - */ -#ifdef CONFIG_DEBUG_PAGEALLOC - printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", - begin, end); - set_memory_np(begin, (end - begin) >> PAGE_SHIFT); -#else - /* - * We just marked the kernel text read only above, now that - * we are going to free part of that, we need to make that - * writeable and non-executable first. - */ - set_memory_nx(begin, (end - begin) >> PAGE_SHIFT); - set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); - - printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); - - for (; addr < end; addr += PAGE_SIZE) { - ClearPageReserved(virt_to_page(addr)); - init_page_count(virt_to_page(addr)); - memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); - free_page(addr); - totalram_pages++; - } -#endif -} - -void free_initmem(void) -{ - free_init_pages("unused kernel memory", - (unsigned long)(&__init_begin), - (unsigned long)(&__init_end)); -} - -#ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) -{ - /* - * end could be not aligned, and We can not align that, - * decompresser could be confused by aligned initrd_end - * We already reserve the end partial page before in - * - i386_start_kernel() - * - x86_64_start_kernel() - * - relocate_initrd() - * So here We can do PAGE_ALIGN() safely to get partial page to be freed - */ - free_init_pages("initrd memory", start, PAGE_ALIGN(end)); -} -#endif - -void __init zone_sizes_init(void) -{ - unsigned long max_zone_pfns[MAX_NR_ZONES]; - - memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); - -#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; -#ifdef CONFIG_HIGHMEM - max_zone_pfns[ZONE_HIGHMEM] = max_pfn; -#endif - - free_area_init_nodes(max_zone_pfns); -} - |