473 lines
13 KiB
C
473 lines
13 KiB
C
#include <linux/gfp.h>
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#include <linux/initrd.h>
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#include <linux/ioport.h>
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#include <linux/swap.h>
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#include <linux/memblock.h>
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#include <linux/bootmem.h> /* for max_low_pfn */
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#include <asm/cacheflush.h>
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#include <asm/e820.h>
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#include <asm/init.h>
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#include <asm/page.h>
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#include <asm/page_types.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include <asm/proto.h>
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#include <asm/dma.h> /* for MAX_DMA_PFN */
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unsigned long __initdata pgt_buf_start;
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unsigned long __meminitdata pgt_buf_end;
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unsigned long __meminitdata pgt_buf_top;
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int after_bootmem;
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int direct_gbpages
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#ifdef CONFIG_DIRECT_GBPAGES
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= 1
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#endif
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;
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struct map_range {
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unsigned long start;
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unsigned long end;
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unsigned page_size_mask;
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};
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static int page_size_mask;
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static void __init probe_page_size_mask(void)
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{
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#if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK)
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/*
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* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
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* This will simplify cpa(), which otherwise needs to support splitting
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* large pages into small in interrupt context, etc.
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*/
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if (direct_gbpages)
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page_size_mask |= 1 << PG_LEVEL_1G;
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if (cpu_has_pse)
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page_size_mask |= 1 << PG_LEVEL_2M;
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#endif
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/* Enable PSE if available */
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if (cpu_has_pse)
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set_in_cr4(X86_CR4_PSE);
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/* Enable PGE if available */
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if (cpu_has_pge) {
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set_in_cr4(X86_CR4_PGE);
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__supported_pte_mask |= _PAGE_GLOBAL;
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}
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}
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void __init native_pagetable_reserve(u64 start, u64 end)
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{
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memblock_reserve(start, end - start);
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}
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#ifdef CONFIG_X86_32
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#define NR_RANGE_MR 3
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#else /* CONFIG_X86_64 */
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#define NR_RANGE_MR 5
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#endif
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static int __meminit save_mr(struct map_range *mr, int nr_range,
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unsigned long start_pfn, unsigned long end_pfn,
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unsigned long page_size_mask)
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{
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if (start_pfn < end_pfn) {
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if (nr_range >= NR_RANGE_MR)
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panic("run out of range for init_memory_mapping\n");
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mr[nr_range].start = start_pfn<<PAGE_SHIFT;
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mr[nr_range].end = end_pfn<<PAGE_SHIFT;
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mr[nr_range].page_size_mask = page_size_mask;
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nr_range++;
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}
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return nr_range;
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}
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static int __meminit split_mem_range(struct map_range *mr, int nr_range,
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unsigned long start,
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unsigned long end)
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{
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unsigned long start_pfn, end_pfn;
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unsigned long pos;
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int i;
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/* head if not big page alignment ? */
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start_pfn = start >> PAGE_SHIFT;
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pos = start_pfn << PAGE_SHIFT;
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#ifdef CONFIG_X86_32
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/*
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* Don't use a large page for the first 2/4MB of memory
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* because there are often fixed size MTRRs in there
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* and overlapping MTRRs into large pages can cause
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* slowdowns.
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*/
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if (pos == 0)
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end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
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else
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end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
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<< (PMD_SHIFT - PAGE_SHIFT);
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#else /* CONFIG_X86_64 */
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end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
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<< (PMD_SHIFT - PAGE_SHIFT);
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#endif
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if (end_pfn > (end >> PAGE_SHIFT))
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end_pfn = end >> PAGE_SHIFT;
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
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pos = end_pfn << PAGE_SHIFT;
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}
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/* big page (2M) range */
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start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
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<< (PMD_SHIFT - PAGE_SHIFT);
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#ifdef CONFIG_X86_32
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end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
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#else /* CONFIG_X86_64 */
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end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
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<< (PUD_SHIFT - PAGE_SHIFT);
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if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
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end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
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#endif
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
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page_size_mask & (1<<PG_LEVEL_2M));
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pos = end_pfn << PAGE_SHIFT;
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}
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#ifdef CONFIG_X86_64
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/* big page (1G) range */
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start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
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<< (PUD_SHIFT - PAGE_SHIFT);
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end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
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page_size_mask &
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((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
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pos = end_pfn << PAGE_SHIFT;
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}
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/* tail is not big page (1G) alignment */
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start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
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<< (PMD_SHIFT - PAGE_SHIFT);
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end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
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if (start_pfn < end_pfn) {
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
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page_size_mask & (1<<PG_LEVEL_2M));
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pos = end_pfn << PAGE_SHIFT;
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}
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#endif
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/* tail is not big page (2M) alignment */
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start_pfn = pos>>PAGE_SHIFT;
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end_pfn = end>>PAGE_SHIFT;
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nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
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/* try to merge same page size and continuous */
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for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
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unsigned long old_start;
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if (mr[i].end != mr[i+1].start ||
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mr[i].page_size_mask != mr[i+1].page_size_mask)
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continue;
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/* move it */
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old_start = mr[i].start;
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memmove(&mr[i], &mr[i+1],
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(nr_range - 1 - i) * sizeof(struct map_range));
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mr[i--].start = old_start;
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nr_range--;
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}
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for (i = 0; i < nr_range; i++)
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printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n",
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mr[i].start, mr[i].end - 1,
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(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
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(mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
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return nr_range;
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}
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/*
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* First calculate space needed for kernel direct mapping page tables to cover
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* mr[0].start to mr[nr_range - 1].end, while accounting for possible 2M and 1GB
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* pages. Then find enough contiguous space for those page tables.
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*/
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static unsigned long __init calculate_table_space_size(unsigned long start, unsigned long end)
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{
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int i;
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unsigned long puds = 0, pmds = 0, ptes = 0, tables;
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struct map_range mr[NR_RANGE_MR];
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int nr_range;
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memset(mr, 0, sizeof(mr));
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nr_range = 0;
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nr_range = split_mem_range(mr, nr_range, start, end);
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for (i = 0; i < nr_range; i++) {
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unsigned long range, extra;
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range = mr[i].end - mr[i].start;
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puds += (range + PUD_SIZE - 1) >> PUD_SHIFT;
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if (mr[i].page_size_mask & (1 << PG_LEVEL_1G)) {
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extra = range - ((range >> PUD_SHIFT) << PUD_SHIFT);
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pmds += (extra + PMD_SIZE - 1) >> PMD_SHIFT;
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} else {
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pmds += (range + PMD_SIZE - 1) >> PMD_SHIFT;
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}
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if (mr[i].page_size_mask & (1 << PG_LEVEL_2M)) {
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extra = range - ((range >> PMD_SHIFT) << PMD_SHIFT);
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#ifdef CONFIG_X86_32
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extra += PMD_SIZE;
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#endif
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ptes += (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
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} else {
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ptes += (range + PAGE_SIZE - 1) >> PAGE_SHIFT;
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}
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}
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tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
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tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
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tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
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#ifdef CONFIG_X86_32
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/* for fixmap */
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tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
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#endif
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return tables;
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}
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static void __init find_early_table_space(unsigned long start,
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unsigned long good_end,
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unsigned long tables)
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{
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phys_addr_t base;
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base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE);
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if (!base)
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panic("Cannot find space for the kernel page tables");
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pgt_buf_start = base >> PAGE_SHIFT;
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pgt_buf_end = pgt_buf_start;
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pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);
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}
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/*
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* Setup the direct mapping of the physical memory at PAGE_OFFSET.
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* This runs before bootmem is initialized and gets pages directly from
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* the physical memory. To access them they are temporarily mapped.
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*/
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unsigned long __init_refok init_memory_mapping(unsigned long start,
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unsigned long end)
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{
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struct map_range mr[NR_RANGE_MR];
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unsigned long ret = 0;
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int nr_range, i;
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pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n",
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start, end - 1);
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memset(mr, 0, sizeof(mr));
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nr_range = split_mem_range(mr, 0, start, end);
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for (i = 0; i < nr_range; i++)
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ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
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mr[i].page_size_mask);
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#ifdef CONFIG_X86_32
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early_ioremap_page_table_range_init();
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load_cr3(swapper_pg_dir);
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#endif
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__flush_tlb_all();
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return ret >> PAGE_SHIFT;
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}
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void __init init_mem_mapping(void)
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{
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unsigned long tables, good_end, end;
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probe_page_size_mask();
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/*
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* Find space for the kernel direct mapping tables.
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*
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* Later we should allocate these tables in the local node of the
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* memory mapped. Unfortunately this is done currently before the
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* nodes are discovered.
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*/
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#ifdef CONFIG_X86_64
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end = max_pfn << PAGE_SHIFT;
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good_end = end;
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#else
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end = max_low_pfn << PAGE_SHIFT;
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good_end = max_pfn_mapped << PAGE_SHIFT;
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#endif
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tables = calculate_table_space_size(0, end);
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find_early_table_space(0, good_end, tables);
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printk(KERN_DEBUG "kernel direct mapping tables up to %#lx @ [mem %#010lx-%#010lx] prealloc\n",
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end - 1, pgt_buf_start << PAGE_SHIFT,
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(pgt_buf_top << PAGE_SHIFT) - 1);
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max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
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max_pfn_mapped = max_low_pfn_mapped;
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#ifdef CONFIG_X86_64
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if (max_pfn > max_low_pfn) {
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max_pfn_mapped = init_memory_mapping(1UL<<32,
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max_pfn<<PAGE_SHIFT);
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/* can we preseve max_low_pfn ?*/
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max_low_pfn = max_pfn;
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}
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#endif
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/*
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* Reserve the kernel pagetable pages we used (pgt_buf_start -
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* pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top)
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* so that they can be reused for other purposes.
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*
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* On native it just means calling memblock_reserve, on Xen it also
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* means marking RW the pagetable pages that we allocated before
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* but that haven't been used.
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*
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* In fact on xen we mark RO the whole range pgt_buf_start -
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* pgt_buf_top, because we have to make sure that when
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* init_memory_mapping reaches the pagetable pages area, it maps
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* RO all the pagetable pages, including the ones that are beyond
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* pgt_buf_end at that time.
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*/
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if (pgt_buf_end > pgt_buf_start) {
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printk(KERN_DEBUG "kernel direct mapping tables up to %#lx @ [mem %#010lx-%#010lx] final\n",
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end - 1, pgt_buf_start << PAGE_SHIFT,
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(pgt_buf_end << PAGE_SHIFT) - 1);
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x86_init.mapping.pagetable_reserve(PFN_PHYS(pgt_buf_start),
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PFN_PHYS(pgt_buf_end));
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}
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/* stop the wrong using */
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pgt_buf_top = 0;
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early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
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}
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/*
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* devmem_is_allowed() checks to see if /dev/mem access to a certain address
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* is valid. The argument is a physical page number.
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*
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*
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* On x86, access has to be given to the first megabyte of ram because that area
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* contains bios code and data regions used by X and dosemu and similar apps.
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* Access has to be given to non-kernel-ram areas as well, these contain the PCI
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* mmio resources as well as potential bios/acpi data regions.
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*/
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int devmem_is_allowed(unsigned long pagenr)
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{
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if (pagenr < 256)
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return 1;
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if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
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return 0;
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if (!page_is_ram(pagenr))
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return 1;
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return 0;
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}
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void free_init_pages(char *what, unsigned long begin, unsigned long end)
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{
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unsigned long addr;
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unsigned long begin_aligned, end_aligned;
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/* Make sure boundaries are page aligned */
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begin_aligned = PAGE_ALIGN(begin);
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end_aligned = end & PAGE_MASK;
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if (WARN_ON(begin_aligned != begin || end_aligned != end)) {
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begin = begin_aligned;
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end = end_aligned;
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}
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if (begin >= end)
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return;
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addr = begin;
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/*
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* If debugging page accesses then do not free this memory but
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* mark them not present - any buggy init-section access will
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* create a kernel page fault:
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*/
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#ifdef CONFIG_DEBUG_PAGEALLOC
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printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n",
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begin, end - 1);
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set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
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#else
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/*
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* We just marked the kernel text read only above, now that
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* we are going to free part of that, we need to make that
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* writeable and non-executable first.
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*/
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set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
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set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
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printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
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for (; addr < end; addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
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free_page(addr);
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totalram_pages++;
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}
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#endif
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}
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void free_initmem(void)
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{
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free_init_pages("unused kernel memory",
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(unsigned long)(&__init_begin),
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(unsigned long)(&__init_end));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void __init free_initrd_mem(unsigned long start, unsigned long end)
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{
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/*
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* end could be not aligned, and We can not align that,
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* decompresser could be confused by aligned initrd_end
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* We already reserve the end partial page before in
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* - i386_start_kernel()
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* - x86_64_start_kernel()
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* - relocate_initrd()
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* So here We can do PAGE_ALIGN() safely to get partial page to be freed
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*/
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free_init_pages("initrd memory", start, PAGE_ALIGN(end));
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}
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#endif
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void __init zone_sizes_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
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#endif
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#ifdef CONFIG_ZONE_DMA32
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max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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#ifdef CONFIG_HIGHMEM
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max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
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#endif
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free_area_init_nodes(max_zone_pfns);
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}
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