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annotate xen/include/asm-x86/page.h @ 3632:fec8b1778268

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bitkeeper revision 1.1159.212.60 (41febc4bKKSkh9u-Zes9v2CmBuLZxA)

More bootstrap fixes for x86/64. Next thing to do is sort out the IDT and
get traps.c working; then we can get rid of a bunch of dummy labels from
end of boot/x86_64.S. We're also going to need some kind of entry.S before
we can safely enable interrupts. Also bear in mind that not all of physical
RAM may be mapped (only first 1GB) and no m2p table is yet allocated or
mapped. Plenty to be done!
author kaf24@viper.(none)
date Mon Jan 31 23:16:27 2005 +0000 (2005-01-31)
parents d1e0d9a8fde0
children bbe8541361dd 253e8e10e986
rev   line source
kaf24@1830 1 /******************************************************************************
kaf24@1830 2 * asm-x86/page.h
kaf24@1830 3 *
kaf24@1830 4 * Definitions relating to page tables.
kaf24@1830 5 */
kaf24@1830 6
kaf24@1830 7 #ifndef __X86_PAGE_H__
kaf24@1830 8 #define __X86_PAGE_H__
kaf24@1830 9
kaf24@1830 10 #if defined(__x86_64__)
kaf24@1490 11
kaf24@1830 12 #define L1_PAGETABLE_SHIFT 12
kaf24@1830 13 #define L2_PAGETABLE_SHIFT 21
kaf24@1830 14 #define L3_PAGETABLE_SHIFT 30
kaf24@1830 15 #define L4_PAGETABLE_SHIFT 39
kaf24@1830 16
kaf24@1830 17 #define ENTRIES_PER_L1_PAGETABLE 512
kaf24@1830 18 #define ENTRIES_PER_L2_PAGETABLE 512
kaf24@1830 19 #define ENTRIES_PER_L3_PAGETABLE 512
kaf24@1830 20 #define ENTRIES_PER_L4_PAGETABLE 512
kaf24@1830 21
kaf24@1830 22 #define __PAGE_OFFSET (0xFFFF830000000000)
kaf24@1830 23
kaf24@1830 24 #elif defined(__i386__)
kaf24@1490 25
kaf24@1490 26 #define L1_PAGETABLE_SHIFT 12
kaf24@1490 27 #define L2_PAGETABLE_SHIFT 22
kaf24@1490 28
kaf24@1490 29 #define ENTRIES_PER_L1_PAGETABLE 1024
kaf24@1490 30 #define ENTRIES_PER_L2_PAGETABLE 1024
kaf24@1490 31
kaf24@1830 32 #define __PAGE_OFFSET (0xFC400000)
kaf24@1830 33
kaf24@1830 34 #endif
kaf24@1830 35
kaf24@1490 36 #define PAGE_SHIFT L1_PAGETABLE_SHIFT
kaf24@1490 37 #define PAGE_SIZE (1UL << PAGE_SHIFT)
kaf24@1490 38 #define PAGE_MASK (~(PAGE_SIZE-1))
kaf24@1490 39
kaf24@1490 40 #define clear_page(_p) memset((void *)(_p), 0, PAGE_SIZE)
kaf24@1490 41 #define copy_page(_t,_f) memcpy((void *)(_t), (void *)(_f), PAGE_SIZE)
kaf24@1490 42
kaf24@1490 43 #ifndef __ASSEMBLY__
kaf24@1490 44 #include <xen/config.h>
kaf24@1490 45 typedef struct { unsigned long l1_lo; } l1_pgentry_t;
kaf24@1490 46 typedef struct { unsigned long l2_lo; } l2_pgentry_t;
kaf24@1830 47 typedef struct { unsigned long l3_lo; } l3_pgentry_t;
kaf24@1830 48 typedef struct { unsigned long l4_lo; } l4_pgentry_t;
kaf24@1490 49 #endif /* !__ASSEMBLY__ */
kaf24@1490 50
kaf24@1490 51 /* Strip type from a table entry. */
kaf24@1490 52 #define l1_pgentry_val(_x) ((_x).l1_lo)
kaf24@1490 53 #define l2_pgentry_val(_x) ((_x).l2_lo)
kaf24@1830 54 #define l3_pgentry_val(_x) ((_x).l3_lo)
kaf24@1830 55 #define l4_pgentry_val(_x) ((_x).l4_lo)
kaf24@1490 56
kaf24@1490 57 /* Add type to a table entry. */
kaf24@1490 58 #define mk_l1_pgentry(_x) ( (l1_pgentry_t) { (_x) } )
kaf24@1490 59 #define mk_l2_pgentry(_x) ( (l2_pgentry_t) { (_x) } )
kaf24@1830 60 #define mk_l3_pgentry(_x) ( (l3_pgentry_t) { (_x) } )
kaf24@1830 61 #define mk_l4_pgentry(_x) ( (l4_pgentry_t) { (_x) } )
kaf24@1490 62
kaf24@1490 63 /* Turn a typed table entry into a page index. */
kaf24@1490 64 #define l1_pgentry_to_pagenr(_x) (l1_pgentry_val(_x) >> PAGE_SHIFT)
kaf24@1490 65 #define l2_pgentry_to_pagenr(_x) (l2_pgentry_val(_x) >> PAGE_SHIFT)
kaf24@1830 66 #define l3_pgentry_to_pagenr(_x) (l3_pgentry_val(_x) >> PAGE_SHIFT)
kaf24@1830 67 #define l4_pgentry_to_pagenr(_x) (l4_pgentry_val(_x) >> PAGE_SHIFT)
kaf24@1490 68
kaf24@1490 69 /* Turn a typed table entry into a physical address. */
kaf24@1490 70 #define l1_pgentry_to_phys(_x) (l1_pgentry_val(_x) & PAGE_MASK)
kaf24@1490 71 #define l2_pgentry_to_phys(_x) (l2_pgentry_val(_x) & PAGE_MASK)
kaf24@1830 72 #define l3_pgentry_to_phys(_x) (l3_pgentry_val(_x) & PAGE_MASK)
kaf24@1830 73 #define l4_pgentry_to_phys(_x) (l4_pgentry_val(_x) & PAGE_MASK)
kaf24@1490 74
kaf24@1830 75 /* Pagetable walking. */
kaf24@1830 76 #define l2_pgentry_to_l1(_x) \
kaf24@1490 77 ((l1_pgentry_t *)__va(l2_pgentry_val(_x) & PAGE_MASK))
kaf24@1830 78 #define l3_pgentry_to_l2(_x) \
kaf24@1830 79 ((l2_pgentry_t *)__va(l3_pgentry_val(_x) & PAGE_MASK))
kaf24@1830 80 #define l4_pgentry_to_l3(_x) \
kaf24@1830 81 ((l3_pgentry_t *)__va(l4_pgentry_val(_x) & PAGE_MASK))
kaf24@1490 82
kaf24@1490 83 /* Given a virtual address, get an entry offset into a page table. */
kaf24@1490 84 #define l1_table_offset(_a) \
kaf24@1490 85 (((_a) >> L1_PAGETABLE_SHIFT) & (ENTRIES_PER_L1_PAGETABLE - 1))
kaf24@1830 86 #if defined(__i386__)
kaf24@1490 87 #define l2_table_offset(_a) \
kaf24@1490 88 ((_a) >> L2_PAGETABLE_SHIFT)
kaf24@1830 89 #elif defined(__x86_64__)
kaf24@1830 90 #define l2_table_offset(_a) \
kaf24@3632 91 (((_a) >> L2_PAGETABLE_SHIFT) & (ENTRIES_PER_L2_PAGETABLE - 1))
kaf24@1830 92 #define l3_table_offset(_a) \
kaf24@3632 93 (((_a) >> L3_PAGETABLE_SHIFT) & (ENTRIES_PER_L3_PAGETABLE - 1))
kaf24@1830 94 #define l4_table_offset(_a) \
kaf24@3632 95 (((_a) >> L4_PAGETABLE_SHIFT) & (ENTRIES_PER_L4_PAGETABLE - 1))
kaf24@3632 96 #endif
kaf24@3632 97
kaf24@3632 98 #if defined(__i386__)
kaf24@3632 99 #define pagetable_t l2_pgentry_t
kaf24@3632 100 #define pagetable_val(_x) ((_x).l2_lo)
kaf24@3632 101 #define mk_pagetable(_x) ( (l2_pgentry_t) { (_x) } )
kaf24@3632 102 #define ENTRIES_PER_PAGETABLE ENTRIES_PER_L2_PAGETABLE
kaf24@3632 103 #elif defined(__x86_64__)
kaf24@3632 104 #define pagetable_t l4_pgentry_t
kaf24@3632 105 #define pagetable_val(_x) ((_x).l4_lo)
kaf24@3632 106 #define mk_pagetable(_x) ( (l4_pgentry_t) { (_x) } )
kaf24@3632 107 #define ENTRIES_PER_PAGETABLE ENTRIES_PER_L4_PAGETABLE
kaf24@1830 108 #endif
kaf24@1490 109
kaf24@1490 110 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
kaf24@1490 111 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
kaf24@1490 112 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
kaf24@1490 113 #define page_address(_p) (__va(((_p) - frame_table) << PAGE_SHIFT))
kaf24@3392 114 #define pfn_to_page(_pfn) (frame_table + (_pfn))
kaf24@1974 115 #define phys_to_page(kaddr) (frame_table + ((kaddr) >> PAGE_SHIFT))
kaf24@1490 116 #define virt_to_page(kaddr) (frame_table + (__pa(kaddr) >> PAGE_SHIFT))
kaf24@1490 117 #define VALID_PAGE(page) ((page - frame_table) < max_mapnr)
kaf24@1490 118
kaf24@1490 119 /*
kaf24@1490 120 * NB. We don't currently track I/O holes in the physical RAM space.
kaf24@1490 121 * For now we guess that I/O devices will be mapped in the first 1MB
kaf24@1490 122 * (e.g., VGA buffers) or beyond the end of physical RAM.
kaf24@1490 123 */
kaf24@1490 124 #define pfn_is_ram(_pfn) (((_pfn) > 0x100) && ((_pfn) < max_page))
kaf24@1490 125
kaf24@1490 126 /* High table entries are reserved by the hypervisor. */
kaf24@1490 127 #define DOMAIN_ENTRIES_PER_L2_PAGETABLE \
kaf24@1490 128 (HYPERVISOR_VIRT_START >> L2_PAGETABLE_SHIFT)
kaf24@1490 129 #define HYPERVISOR_ENTRIES_PER_L2_PAGETABLE \
kaf24@1490 130 (ENTRIES_PER_L2_PAGETABLE - DOMAIN_ENTRIES_PER_L2_PAGETABLE)
kaf24@1490 131
kaf24@1490 132 #ifndef __ASSEMBLY__
kaf24@1490 133 #include <asm/processor.h>
kaf24@1490 134 #include <asm/fixmap.h>
kaf24@1490 135 #include <asm/bitops.h>
kaf24@1490 136 #include <asm/flushtlb.h>
kaf24@1490 137
kaf24@1490 138 #define linear_pg_table ((l1_pgentry_t *)LINEAR_PT_VIRT_START)
kaf24@1490 139 #define linear_l2_table ((l2_pgentry_t *)(LINEAR_PT_VIRT_START+(LINEAR_PT_VIRT_START>>(L2_PAGETABLE_SHIFT-L1_PAGETABLE_SHIFT))))
kaf24@1490 140
kaf24@1490 141 #define va_to_l1mfn(_va) (l2_pgentry_val(linear_l2_table[_va>>L2_PAGETABLE_SHIFT]) >> PAGE_SHIFT)
kaf24@1490 142
kaf24@3632 143 extern pagetable_t idle_pg_table[ENTRIES_PER_PAGETABLE];
kaf24@3336 144
kaf24@1490 145 extern void paging_init(void);
kaf24@1490 146
kaf24@1490 147 /* Flush global pages as well. */
kaf24@1490 148
kaf24@1490 149 #define __pge_off() \
kaf24@1490 150 do { \
kaf24@1490 151 __asm__ __volatile__( \
kaf24@1660 152 "mov %0, %%cr4; # turn off PGE " \
kaf24@1490 153 :: "r" (mmu_cr4_features & ~X86_CR4_PGE)); \
kaf24@1490 154 } while (0)
kaf24@1490 155
kaf24@1490 156 #define __pge_on() \
kaf24@1490 157 do { \
kaf24@1490 158 __asm__ __volatile__( \
kaf24@1660 159 "mov %0, %%cr4; # turn off PGE " \
kaf24@1490 160 :: "r" (mmu_cr4_features)); \
kaf24@1490 161 } while (0)
kaf24@1490 162
kaf24@1490 163
kaf24@1490 164 #define __flush_tlb_pge() \
kaf24@1490 165 do { \
kaf24@1490 166 __pge_off(); \
kaf24@1490 167 __flush_tlb(); \
kaf24@1490 168 __pge_on(); \
kaf24@1490 169 } while (0)
kaf24@1490 170
kaf24@1490 171 #define __flush_tlb_one(__addr) \
kaf24@1490 172 __asm__ __volatile__("invlpg %0": :"m" (*(char *) (__addr)))
kaf24@1490 173
kaf24@1490 174 #endif /* !__ASSEMBLY__ */
kaf24@1490 175
kaf24@1490 176
kaf24@1490 177 #define _PAGE_PRESENT 0x001
kaf24@1490 178 #define _PAGE_RW 0x002
kaf24@1490 179 #define _PAGE_USER 0x004
kaf24@1490 180 #define _PAGE_PWT 0x008
kaf24@1490 181 #define _PAGE_PCD 0x010
kaf24@1490 182 #define _PAGE_ACCESSED 0x020
kaf24@1490 183 #define _PAGE_DIRTY 0x040
kaf24@1490 184 #define _PAGE_PAT 0x080
kaf24@1490 185 #define _PAGE_PSE 0x080
kaf24@1490 186 #define _PAGE_GLOBAL 0x100
kaf24@1490 187
kaf24@1490 188 #define __PAGE_HYPERVISOR \
kaf24@1490 189 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
kaf24@1490 190 #define __PAGE_HYPERVISOR_NOCACHE \
kaf24@1490 191 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED)
kaf24@1490 192
kaf24@1490 193 #define MAKE_GLOBAL(_x) ((_x) | _PAGE_GLOBAL)
kaf24@1490 194
kaf24@1490 195 #define PAGE_HYPERVISOR MAKE_GLOBAL(__PAGE_HYPERVISOR)
kaf24@1490 196 #define PAGE_HYPERVISOR_NOCACHE MAKE_GLOBAL(__PAGE_HYPERVISOR_NOCACHE)
kaf24@1490 197
kaf24@1490 198 #ifndef __ASSEMBLY__
kaf24@3632 199
kaf24@1490 200 static __inline__ int get_order(unsigned long size)
kaf24@1490 201 {
kaf24@1490 202 int order;
kaf24@1490 203
kaf24@1490 204 size = (size-1) >> (PAGE_SHIFT-1);
kaf24@1490 205 order = -1;
kaf24@1490 206 do {
kaf24@1490 207 size >>= 1;
kaf24@1490 208 order++;
kaf24@1490 209 } while (size);
kaf24@1490 210 return order;
kaf24@1490 211 }
kaf24@1696 212
kaf24@1696 213 extern void zap_low_mappings(void);
kaf24@3632 214
kaf24@3632 215 /* Map physical byte range (@p, @p+@s) at virt address @v in pagetable @pt. */
kaf24@3632 216 extern int
kaf24@3632 217 map_pages(
kaf24@3632 218 pagetable_t *pt,
kaf24@3632 219 unsigned long v,
kaf24@3632 220 unsigned long p,
kaf24@3632 221 unsigned long s,
kaf24@3632 222 unsigned long flags);
kaf24@3632 223
kaf24@3632 224 #endif /* !__ASSEMBLY__ */
kaf24@1490 225
kaf24@1830 226 #endif /* __I386_PAGE_H__ */