init.c revision dc9dd5cc854cde110d2421f3a11fec7597e059c1
1540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg#include <linux/ioport.h> 2e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#include <linux/swap.h> 3540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg 4e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#include <asm/cacheflush.h> 5f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#include <asm/e820.h> 64fcb208391be5cf82c6fe2779c5eb9245ac97e91Pekka Enberg#include <asm/init.h> 7e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#include <asm/page.h> 8540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg#include <asm/page_types.h> 9e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#include <asm/sections.h> 10e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#include <asm/system.h> 11f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#include <asm/tlbflush.h> 12f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 13298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enbergunsigned long __initdata e820_table_start; 14298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enbergunsigned long __meminitdata e820_table_end; 15298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enbergunsigned long __meminitdata e820_table_top; 16f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 17f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enbergint after_bootmem; 18f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 19f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enbergint direct_gbpages 20f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_DIRECT_GBPAGES 21f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg = 1 22f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 23f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg; 24f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 25f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enbergstatic void __init find_early_table_space(unsigned long end, int use_pse, 26f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg int use_gbpages) 27f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg{ 28f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long puds, pmds, ptes, tables, start; 29f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 30f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; 31f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); 32f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 33f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (use_gbpages) { 34f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long extra; 35f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 36f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); 37f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; 38f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } else 39f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; 40f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 41f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); 42f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 43f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (use_pse) { 44f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long extra; 45f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 46f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); 47f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 48f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg extra += PMD_SIZE; 49f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 50f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; 51f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } else 52f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; 53f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 54f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); 55f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 56f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 57f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* for fixmap */ 58f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE); 59f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 60f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 61f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* 62f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * RED-PEN putting page tables only on node 0 could 63f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * cause a hotspot and fill up ZONE_DMA. The page tables 64f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * need roughly 0.5KB per GB. 65f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg */ 66f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 67f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg start = 0x7000; 68298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg e820_table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT, 69f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg tables, PAGE_SIZE); 70f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#else /* CONFIG_X86_64 */ 71f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg start = 0x8000; 72298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg e820_table_start = find_e820_area(start, end, tables, PAGE_SIZE); 73f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 74298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg if (e820_table_start == -1UL) 75f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg panic("Cannot find space for the kernel page tables"); 76f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 77298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg e820_table_start >>= PAGE_SHIFT; 78298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg e820_table_end = e820_table_start; 79298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg e820_table_top = e820_table_start + (tables >> PAGE_SHIFT); 80f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 81f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", 82298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg end, e820_table_start << PAGE_SHIFT, e820_table_top << PAGE_SHIFT); 83f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg} 84f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 85f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enbergstruct map_range { 86f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long start; 87f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long end; 88f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned page_size_mask; 89f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg}; 90f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 91f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 92f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#define NR_RANGE_MR 3 93f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#else /* CONFIG_X86_64 */ 94f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#define NR_RANGE_MR 5 95f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 96f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 97dc9dd5cc854cde110d2421f3a11fec7597e059c1Jan Beulichstatic int __meminit save_mr(struct map_range *mr, int nr_range, 98dc9dd5cc854cde110d2421f3a11fec7597e059c1Jan Beulich unsigned long start_pfn, unsigned long end_pfn, 99dc9dd5cc854cde110d2421f3a11fec7597e059c1Jan Beulich unsigned long page_size_mask) 100f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg{ 101f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (start_pfn < end_pfn) { 102f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (nr_range >= NR_RANGE_MR) 103f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg panic("run out of range for init_memory_mapping\n"); 104f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mr[nr_range].start = start_pfn<<PAGE_SHIFT; 105f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mr[nr_range].end = end_pfn<<PAGE_SHIFT; 106f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mr[nr_range].page_size_mask = page_size_mask; 107f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range++; 108f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } 109f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 110f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg return nr_range; 111f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg} 112f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 113f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_64 114f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enbergstatic void __init init_gbpages(void) 115f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg{ 116f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (direct_gbpages && cpu_has_gbpages) 117f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg printk(KERN_INFO "Using GB pages for direct mapping\n"); 118f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg else 119f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg direct_gbpages = 0; 120f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg} 121f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#else 122f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enbergstatic inline void init_gbpages(void) 123f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg{ 124f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg} 125f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 126f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 127f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg/* 128f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * Setup the direct mapping of the physical memory at PAGE_OFFSET. 129f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * This runs before bootmem is initialized and gets pages directly from 130f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * the physical memory. To access them they are temporarily mapped. 131f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg */ 132f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enbergunsigned long __init_refok init_memory_mapping(unsigned long start, 133f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long end) 134f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg{ 135f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long page_size_mask = 0; 136f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long start_pfn, end_pfn; 137c77a3b59c624454c501cbfa1a3611d5a00bf9532Pekka Enberg unsigned long ret = 0; 138f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long pos; 139f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 140f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg struct map_range mr[NR_RANGE_MR]; 141f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg int nr_range, i; 142f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg int use_pse, use_gbpages; 143f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 144f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); 145f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 146f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (!after_bootmem) 147f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg init_gbpages(); 148f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 149f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_DEBUG_PAGEALLOC 150f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* 151f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. 152f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * This will simplify cpa(), which otherwise needs to support splitting 153f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * large pages into small in interrupt context, etc. 154f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg */ 155f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg use_pse = use_gbpages = 0; 156f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#else 157f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg use_pse = cpu_has_pse; 158f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg use_gbpages = direct_gbpages; 159f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 160f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 161f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 162f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_PAE 163f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg set_nx(); 164f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (nx_enabled) 165f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg printk(KERN_INFO "NX (Execute Disable) protection: active\n"); 166f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 167f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 168f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* Enable PSE if available */ 169f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (cpu_has_pse) 170f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg set_in_cr4(X86_CR4_PSE); 171f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 172f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* Enable PGE if available */ 173f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (cpu_has_pge) { 174f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg set_in_cr4(X86_CR4_PGE); 175f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg __supported_pte_mask |= _PAGE_GLOBAL; 176f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } 177f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 178f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 179f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (use_gbpages) 180f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg page_size_mask |= 1 << PG_LEVEL_1G; 181f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (use_pse) 182f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg page_size_mask |= 1 << PG_LEVEL_2M; 183f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 184f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg memset(mr, 0, sizeof(mr)); 185f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range = 0; 186f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 187f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* head if not big page alignment ? */ 188f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg start_pfn = start >> PAGE_SHIFT; 189f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg pos = start_pfn << PAGE_SHIFT; 190f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 191f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* 192f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * Don't use a large page for the first 2/4MB of memory 193f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * because there are often fixed size MTRRs in there 194f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * and overlapping MTRRs into large pages can cause 195f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * slowdowns. 196f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg */ 197f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (pos == 0) 198f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT); 199f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg else 200f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) 201f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg << (PMD_SHIFT - PAGE_SHIFT); 202f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#else /* CONFIG_X86_64 */ 203f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) 204f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg << (PMD_SHIFT - PAGE_SHIFT); 205f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 206f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (end_pfn > (end >> PAGE_SHIFT)) 207f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = end >> PAGE_SHIFT; 208f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (start_pfn < end_pfn) { 209f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 210f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg pos = end_pfn << PAGE_SHIFT; 211f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } 212f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 213f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* big page (2M) range */ 214f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) 215f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg << (PMD_SHIFT - PAGE_SHIFT); 216f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 217f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); 218f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#else /* CONFIG_X86_64 */ 219f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) 220f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg << (PUD_SHIFT - PAGE_SHIFT); 221f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) 222f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); 223f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 224f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 225f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (start_pfn < end_pfn) { 226f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 227f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg page_size_mask & (1<<PG_LEVEL_2M)); 228f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg pos = end_pfn << PAGE_SHIFT; 229f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } 230f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 231f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_64 232f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* big page (1G) range */ 233f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) 234f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg << (PUD_SHIFT - PAGE_SHIFT); 235f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); 236f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (start_pfn < end_pfn) { 237f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 238f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg page_size_mask & 239f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); 240f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg pos = end_pfn << PAGE_SHIFT; 241f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } 242f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 243f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* tail is not big page (1G) alignment */ 244f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) 245f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg << (PMD_SHIFT - PAGE_SHIFT); 246f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); 247f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (start_pfn < end_pfn) { 248f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 249f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg page_size_mask & (1<<PG_LEVEL_2M)); 250f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg pos = end_pfn << PAGE_SHIFT; 251f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } 252f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 253f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 254f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* tail is not big page (2M) alignment */ 255f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg start_pfn = pos>>PAGE_SHIFT; 256f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg end_pfn = end>>PAGE_SHIFT; 257f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 258f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 259f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* try to merge same page size and continuous */ 260f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { 261f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg unsigned long old_start; 262f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (mr[i].end != mr[i+1].start || 263f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mr[i].page_size_mask != mr[i+1].page_size_mask) 264f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg continue; 265f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* move it */ 266f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg old_start = mr[i].start; 267f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg memmove(&mr[i], &mr[i+1], 268f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg (nr_range - 1 - i) * sizeof(struct map_range)); 269f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mr[i--].start = old_start; 270f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg nr_range--; 271f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg } 272f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 273f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg for (i = 0; i < nr_range; i++) 274f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg printk(KERN_DEBUG " %010lx - %010lx page %s\n", 275f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mr[i].start, mr[i].end, 276f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( 277f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); 278f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 279f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg /* 280f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * Find space for the kernel direct mapping tables. 281f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * 282f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * Later we should allocate these tables in the local node of the 283f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * memory mapped. Unfortunately this is done currently before the 284f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg * nodes are discovered. 285f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg */ 286f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (!after_bootmem) 287f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg find_early_table_space(end, use_pse, use_gbpages); 288f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 289f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 290f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg for (i = 0; i < nr_range; i++) 291e53fb04fce6d246ebed755b904ed1b0b814a754cPekka Enberg kernel_physical_mapping_init(mr[i].start, mr[i].end, 292e53fb04fce6d246ebed755b904ed1b0b814a754cPekka Enberg mr[i].page_size_mask); 293f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg ret = end; 294f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#else /* CONFIG_X86_64 */ 295f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg for (i = 0; i < nr_range; i++) 296f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg ret = kernel_physical_mapping_init(mr[i].start, mr[i].end, 297f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mr[i].page_size_mask); 298f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 299f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 300f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_32 301f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg early_ioremap_page_table_range_init(); 302f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 303f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg load_cr3(swapper_pg_dir); 304f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 305f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 306f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#ifdef CONFIG_X86_64 307f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (!after_bootmem) 308f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg mmu_cr4_features = read_cr4(); 309f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg#endif 310f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg __flush_tlb_all(); 311f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 312298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg if (!after_bootmem && e820_table_end > e820_table_start) 313298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg reserve_early(e820_table_start << PAGE_SHIFT, 314298af9d89f3f5292e81a0a00f729c415adc4d8fbPekka Enberg e820_table_end << PAGE_SHIFT, "PGTABLE"); 315f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 316f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg if (!after_bootmem) 317f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg early_memtest(start, end); 318f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 319f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg return ret >> PAGE_SHIFT; 320f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg} 321f765090a2617b8d9cb73b71e0aa850c29460d8bePekka Enberg 322e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg 323540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg/* 324540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * devmem_is_allowed() checks to see if /dev/mem access to a certain address 325540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * is valid. The argument is a physical page number. 326540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * 327540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * 328540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * On x86, access has to be given to the first megabyte of ram because that area 329540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * contains bios code and data regions used by X and dosemu and similar apps. 330540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * Access has to be given to non-kernel-ram areas as well, these contain the PCI 331540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg * mmio resources as well as potential bios/acpi data regions. 332540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg */ 333540aca06b737cc38965b52eeceefba3d24376461Pekka Enbergint devmem_is_allowed(unsigned long pagenr) 334540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg{ 335540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg if (pagenr <= 256) 336540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg return 1; 337540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) 338540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg return 0; 339540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg if (!page_is_ram(pagenr)) 340540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg return 1; 341540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg return 0; 342540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg} 343540aca06b737cc38965b52eeceefba3d24376461Pekka Enberg 344e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enbergvoid free_init_pages(char *what, unsigned long begin, unsigned long end) 345e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg{ 346e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg unsigned long addr = begin; 347e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg 348e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg if (addr >= end) 349e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg return; 350e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg 351e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg /* 352e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg * If debugging page accesses then do not free this memory but 353e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg * mark them not present - any buggy init-section access will 354e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg * create a kernel page fault: 355e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg */ 356e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#ifdef CONFIG_DEBUG_PAGEALLOC 357e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", 358e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg begin, PAGE_ALIGN(end)); 359e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg set_memory_np(begin, (end - begin) >> PAGE_SHIFT); 360e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#else 361e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg /* 362e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg * We just marked the kernel text read only above, now that 363e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg * we are going to free part of that, we need to make that 364e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg * writeable first. 365e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg */ 366e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); 367e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg 368e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); 369e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg 370e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg for (; addr < end; addr += PAGE_SIZE) { 371e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg ClearPageReserved(virt_to_page(addr)); 372e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg init_page_count(virt_to_page(addr)); 373e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg memset((void *)(addr & ~(PAGE_SIZE-1)), 374e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg POISON_FREE_INITMEM, PAGE_SIZE); 375e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg free_page(addr); 376e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg totalram_pages++; 377e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg } 378e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg#endif 379e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg} 380e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg 381e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enbergvoid free_initmem(void) 382e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg{ 383e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg free_init_pages("unused kernel memory", 384e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg (unsigned long)(&__init_begin), 385e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg (unsigned long)(&__init_end)); 386e5b2bb552706ca0e30795ee84caacbb37cec5705Pekka Enberg} 387731ddea63600c24ff01e6e5144cea88bf7266ac5Pekka Enberg 388731ddea63600c24ff01e6e5144cea88bf7266ac5Pekka Enberg#ifdef CONFIG_BLK_DEV_INITRD 389731ddea63600c24ff01e6e5144cea88bf7266ac5Pekka Enbergvoid free_initrd_mem(unsigned long start, unsigned long end) 390731ddea63600c24ff01e6e5144cea88bf7266ac5Pekka Enberg{ 391731ddea63600c24ff01e6e5144cea88bf7266ac5Pekka Enberg free_init_pages("initrd memory", start, end); 392731ddea63600c24ff01e6e5144cea88bf7266ac5Pekka Enberg} 393731ddea63600c24ff01e6e5144cea88bf7266ac5Pekka Enberg#endif 394