H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 1 | #ifndef _ASM_X86_DESC_H |
| 2 | #define _ASM_X86_DESC_H |
Glauber de Oliveira Costa | 80fbb69 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 3 | |
Glauber de Oliveira Costa | 80fbb69 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 4 | #include <asm/desc_defs.h> |
| 5 | #include <asm/ldt.h> |
Glauber de Oliveira Costa | 881c297 | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 6 | #include <asm/mmu.h> |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 7 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 8 | #include <linux/smp.h> |
Glauber de Oliveira Costa | 80fbb69 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 9 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 10 | static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *info) |
Glauber de Oliveira Costa | 80fbb69 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 11 | { |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 12 | desc->limit0 = info->limit & 0x0ffff; |
Glauber de Oliveira Costa | 80fbb69 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 13 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 14 | desc->base0 = (info->base_addr & 0x0000ffff); |
| 15 | desc->base1 = (info->base_addr & 0x00ff0000) >> 16; |
| 16 | |
| 17 | desc->type = (info->read_exec_only ^ 1) << 1; |
| 18 | desc->type |= info->contents << 2; |
| 19 | |
| 20 | desc->s = 1; |
| 21 | desc->dpl = 0x3; |
| 22 | desc->p = info->seg_not_present ^ 1; |
| 23 | desc->limit = (info->limit & 0xf0000) >> 16; |
| 24 | desc->avl = info->useable; |
| 25 | desc->d = info->seg_32bit; |
| 26 | desc->g = info->limit_in_pages; |
| 27 | |
| 28 | desc->base2 = (info->base_addr & 0xff000000) >> 24; |
Jeremy Fitzhardinge | 64f53a0 | 2008-07-27 08:42:32 -0700 | [diff] [blame] | 29 | /* |
| 30 | * Don't allow setting of the lm bit. It is useless anyway |
| 31 | * because 64bit system calls require __USER_CS: |
| 32 | */ |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 33 | desc->l = 0; |
Glauber de Oliveira Costa | 80fbb69 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 34 | } |
| 35 | |
Glauber de Oliveira Costa | 881c297 | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 36 | extern struct desc_ptr idt_descr; |
| 37 | extern gate_desc idt_table[]; |
Glauber de Oliveira Costa | 80fbb69 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 38 | |
Glauber Costa | a939098 | 2008-05-28 16:19:53 -0700 | [diff] [blame] | 39 | struct gdt_page { |
| 40 | struct desc_struct gdt[GDT_ENTRIES]; |
| 41 | } __attribute__((aligned(PAGE_SIZE))); |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 42 | |
David Howells | 9b8de74 | 2009-04-21 23:00:24 +0100 | [diff] [blame] | 43 | DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page); |
Glauber Costa | a939098 | 2008-05-28 16:19:53 -0700 | [diff] [blame] | 44 | |
| 45 | static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu) |
| 46 | { |
| 47 | return per_cpu(gdt_page, cpu).gdt; |
| 48 | } |
| 49 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 50 | #ifdef CONFIG_X86_64 |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 51 | |
| 52 | static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func, |
| 53 | unsigned dpl, unsigned ist, unsigned seg) |
| 54 | { |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 55 | gate->offset_low = PTR_LOW(func); |
| 56 | gate->segment = __KERNEL_CS; |
| 57 | gate->ist = ist; |
| 58 | gate->p = 1; |
| 59 | gate->dpl = dpl; |
| 60 | gate->zero0 = 0; |
| 61 | gate->zero1 = 0; |
| 62 | gate->type = type; |
| 63 | gate->offset_middle = PTR_MIDDLE(func); |
| 64 | gate->offset_high = PTR_HIGH(func); |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 65 | } |
| 66 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 67 | #else |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 68 | static inline void pack_gate(gate_desc *gate, unsigned char type, |
Joe Perches | c1773a1 | 2008-03-23 01:01:58 -0700 | [diff] [blame] | 69 | unsigned long base, unsigned dpl, unsigned flags, |
| 70 | unsigned short seg) |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 71 | { |
| 72 | gate->a = (seg << 16) | (base & 0xffff); |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 73 | gate->b = (base & 0xffff0000) | (((0x80 | type | (dpl << 5)) & 0xff) << 8); |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 74 | } |
| 75 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 76 | #endif |
| 77 | |
Glauber de Oliveira Costa | 746ff60 | 2008-01-30 13:31:27 +0100 | [diff] [blame] | 78 | static inline int desc_empty(const void *ptr) |
| 79 | { |
| 80 | const u32 *desc = ptr; |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 81 | |
Glauber de Oliveira Costa | 746ff60 | 2008-01-30 13:31:27 +0100 | [diff] [blame] | 82 | return !(desc[0] | desc[1]); |
| 83 | } |
| 84 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 85 | #ifdef CONFIG_PARAVIRT |
| 86 | #include <asm/paravirt.h> |
| 87 | #else |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 88 | #define load_TR_desc() native_load_tr_desc() |
| 89 | #define load_gdt(dtr) native_load_gdt(dtr) |
| 90 | #define load_idt(dtr) native_load_idt(dtr) |
| 91 | #define load_tr(tr) asm volatile("ltr %0"::"m" (tr)) |
| 92 | #define load_ldt(ldt) asm volatile("lldt %0"::"m" (ldt)) |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 93 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 94 | #define store_gdt(dtr) native_store_gdt(dtr) |
| 95 | #define store_idt(dtr) native_store_idt(dtr) |
| 96 | #define store_tr(tr) (tr = native_store_tr()) |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 97 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 98 | #define load_TLS(t, cpu) native_load_tls(t, cpu) |
| 99 | #define set_ldt native_set_ldt |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 100 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 101 | #define write_ldt_entry(dt, entry, desc) native_write_ldt_entry(dt, entry, desc) |
| 102 | #define write_gdt_entry(dt, entry, desc, type) native_write_gdt_entry(dt, entry, desc, type) |
| 103 | #define write_idt_entry(dt, entry, g) native_write_idt_entry(dt, entry, g) |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 104 | |
| 105 | static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries) |
| 106 | { |
| 107 | } |
| 108 | |
| 109 | static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries) |
| 110 | { |
| 111 | } |
| 112 | #endif /* CONFIG_PARAVIRT */ |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 113 | |
Jaswinder Singh Rajput | 8229d75 | 2009-03-11 19:13:49 +0530 | [diff] [blame] | 114 | #define store_ldt(ldt) asm("sldt %0" : "=m"(ldt)) |
| 115 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 116 | static inline void native_write_idt_entry(gate_desc *idt, int entry, const gate_desc *gate) |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 117 | { |
| 118 | memcpy(&idt[entry], gate, sizeof(*gate)); |
| 119 | } |
| 120 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 121 | static inline void native_write_ldt_entry(struct desc_struct *ldt, int entry, const void *desc) |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 122 | { |
| 123 | memcpy(&ldt[entry], desc, 8); |
| 124 | } |
| 125 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 126 | static inline void |
| 127 | native_write_gdt_entry(struct desc_struct *gdt, int entry, const void *desc, int type) |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 128 | { |
| 129 | unsigned int size; |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 130 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 131 | switch (type) { |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 132 | case DESC_TSS: size = sizeof(tss_desc); break; |
| 133 | case DESC_LDT: size = sizeof(ldt_desc); break; |
| 134 | default: size = sizeof(*gdt); break; |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 135 | } |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 136 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 137 | memcpy(&gdt[entry], desc, size); |
| 138 | } |
| 139 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 140 | static inline void pack_descriptor(struct desc_struct *desc, unsigned long base, |
| 141 | unsigned long limit, unsigned char type, |
| 142 | unsigned char flags) |
| 143 | { |
| 144 | desc->a = ((base & 0xffff) << 16) | (limit & 0xffff); |
| 145 | desc->b = (base & 0xff000000) | ((base & 0xff0000) >> 16) | |
Joe Perches | c1773a1 | 2008-03-23 01:01:58 -0700 | [diff] [blame] | 146 | (limit & 0x000f0000) | ((type & 0xff) << 8) | |
| 147 | ((flags & 0xf) << 20); |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 148 | desc->p = 1; |
| 149 | } |
| 150 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 151 | |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 152 | static inline void set_tssldt_descriptor(void *d, unsigned long addr, unsigned type, unsigned size) |
Glauber de Oliveira Costa | c81c6ca | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 153 | { |
| 154 | #ifdef CONFIG_X86_64 |
Glauber de Oliveira Costa | f6e0eba | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 155 | struct ldttss_desc64 *desc = d; |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 156 | |
Glauber de Oliveira Costa | f6e0eba | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 157 | memset(desc, 0, sizeof(*desc)); |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 158 | |
| 159 | desc->limit0 = size & 0xFFFF; |
| 160 | desc->base0 = PTR_LOW(addr); |
| 161 | desc->base1 = PTR_MIDDLE(addr) & 0xFF; |
| 162 | desc->type = type; |
| 163 | desc->p = 1; |
| 164 | desc->limit1 = (size >> 16) & 0xF; |
| 165 | desc->base2 = (PTR_MIDDLE(addr) >> 8) & 0xFF; |
| 166 | desc->base3 = PTR_HIGH(addr); |
Glauber de Oliveira Costa | c81c6ca | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 167 | #else |
Glauber de Oliveira Costa | f6e0eba | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 168 | pack_descriptor((struct desc_struct *)d, addr, size, 0x80 | type, 0); |
Glauber de Oliveira Costa | c81c6ca | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 169 | #endif |
| 170 | } |
| 171 | |
| 172 | static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr) |
| 173 | { |
| 174 | struct desc_struct *d = get_cpu_gdt_table(cpu); |
| 175 | tss_desc tss; |
| 176 | |
| 177 | /* |
| 178 | * sizeof(unsigned long) coming from an extra "long" at the end |
| 179 | * of the iobitmap. See tss_struct definition in processor.h |
| 180 | * |
| 181 | * -1? seg base+limit should be pointing to the address of the |
| 182 | * last valid byte |
| 183 | */ |
Glauber de Oliveira Costa | f6e0eba | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 184 | set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, |
Joe Perches | c1773a1 | 2008-03-23 01:01:58 -0700 | [diff] [blame] | 185 | IO_BITMAP_OFFSET + IO_BITMAP_BYTES + |
| 186 | sizeof(unsigned long) - 1); |
Glauber de Oliveira Costa | c81c6ca | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 187 | write_gdt_entry(d, entry, &tss, DESC_TSS); |
| 188 | } |
| 189 | |
| 190 | #define set_tss_desc(cpu, addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr) |
| 191 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 192 | static inline void native_set_ldt(const void *addr, unsigned int entries) |
| 193 | { |
| 194 | if (likely(entries == 0)) |
Joe Perches | c1773a1 | 2008-03-23 01:01:58 -0700 | [diff] [blame] | 195 | asm volatile("lldt %w0"::"q" (0)); |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 196 | else { |
| 197 | unsigned cpu = smp_processor_id(); |
| 198 | ldt_desc ldt; |
| 199 | |
Michael Karcher | 5ac37f8 | 2008-07-11 18:04:46 +0200 | [diff] [blame] | 200 | set_tssldt_descriptor(&ldt, (unsigned long)addr, DESC_LDT, |
| 201 | entries * LDT_ENTRY_SIZE - 1); |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 202 | write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, |
| 203 | &ldt, DESC_LDT); |
Joe Perches | c1773a1 | 2008-03-23 01:01:58 -0700 | [diff] [blame] | 204 | asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8)); |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 205 | } |
| 206 | } |
| 207 | |
| 208 | static inline void native_load_tr_desc(void) |
| 209 | { |
| 210 | asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8)); |
| 211 | } |
| 212 | |
| 213 | static inline void native_load_gdt(const struct desc_ptr *dtr) |
| 214 | { |
| 215 | asm volatile("lgdt %0"::"m" (*dtr)); |
| 216 | } |
| 217 | |
| 218 | static inline void native_load_idt(const struct desc_ptr *dtr) |
| 219 | { |
| 220 | asm volatile("lidt %0"::"m" (*dtr)); |
| 221 | } |
| 222 | |
| 223 | static inline void native_store_gdt(struct desc_ptr *dtr) |
| 224 | { |
| 225 | asm volatile("sgdt %0":"=m" (*dtr)); |
| 226 | } |
| 227 | |
| 228 | static inline void native_store_idt(struct desc_ptr *dtr) |
| 229 | { |
| 230 | asm volatile("sidt %0":"=m" (*dtr)); |
| 231 | } |
| 232 | |
| 233 | static inline unsigned long native_store_tr(void) |
| 234 | { |
| 235 | unsigned long tr; |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 236 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 237 | asm volatile("str %0":"=r" (tr)); |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 238 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 239 | return tr; |
| 240 | } |
| 241 | |
| 242 | static inline void native_load_tls(struct thread_struct *t, unsigned int cpu) |
| 243 | { |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 244 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 245 | unsigned int i; |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 246 | |
| 247 | for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++) |
| 248 | gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i]; |
| 249 | } |
| 250 | |
Joe Perches | c1773a1 | 2008-03-23 01:01:58 -0700 | [diff] [blame] | 251 | #define _LDT_empty(info) \ |
| 252 | ((info)->base_addr == 0 && \ |
| 253 | (info)->limit == 0 && \ |
| 254 | (info)->contents == 0 && \ |
| 255 | (info)->read_exec_only == 1 && \ |
| 256 | (info)->seg_32bit == 0 && \ |
| 257 | (info)->limit_in_pages == 0 && \ |
| 258 | (info)->seg_not_present == 1 && \ |
| 259 | (info)->useable == 0) |
Glauber de Oliveira Costa | 881c297 | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 260 | |
| 261 | #ifdef CONFIG_X86_64 |
| 262 | #define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0)) |
| 263 | #else |
| 264 | #define LDT_empty(info) (_LDT_empty(info)) |
| 265 | #endif |
| 266 | |
| 267 | static inline void clear_LDT(void) |
| 268 | { |
| 269 | set_ldt(NULL, 0); |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * load one particular LDT into the current CPU |
| 274 | */ |
| 275 | static inline void load_LDT_nolock(mm_context_t *pc) |
| 276 | { |
| 277 | set_ldt(pc->ldt, pc->size); |
| 278 | } |
| 279 | |
| 280 | static inline void load_LDT(mm_context_t *pc) |
| 281 | { |
| 282 | preempt_disable(); |
| 283 | load_LDT_nolock(pc); |
| 284 | preempt_enable(); |
| 285 | } |
| 286 | |
Roland McGrath | 1bd5718 | 2008-01-30 13:31:51 +0100 | [diff] [blame] | 287 | static inline unsigned long get_desc_base(const struct desc_struct *desc) |
Glauber de Oliveira Costa | cc69785 | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 288 | { |
Chris Lalancette | 2c75910 | 2009-11-05 11:47:08 +0100 | [diff] [blame] | 289 | return (unsigned)(desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24)); |
Glauber de Oliveira Costa | cc69785 | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 290 | } |
Roland McGrath | 1bd5718 | 2008-01-30 13:31:51 +0100 | [diff] [blame] | 291 | |
Akinobu Mita | 5759474 | 2009-07-19 00:11:06 +0900 | [diff] [blame] | 292 | static inline void set_desc_base(struct desc_struct *desc, unsigned long base) |
| 293 | { |
| 294 | desc->base0 = base & 0xffff; |
| 295 | desc->base1 = (base >> 16) & 0xff; |
| 296 | desc->base2 = (base >> 24) & 0xff; |
| 297 | } |
| 298 | |
Roland McGrath | 1bd5718 | 2008-01-30 13:31:51 +0100 | [diff] [blame] | 299 | static inline unsigned long get_desc_limit(const struct desc_struct *desc) |
| 300 | { |
| 301 | return desc->limit0 | (desc->limit << 16); |
| 302 | } |
| 303 | |
Akinobu Mita | 5759474 | 2009-07-19 00:11:06 +0900 | [diff] [blame] | 304 | static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit) |
| 305 | { |
| 306 | desc->limit0 = limit & 0xffff; |
| 307 | desc->limit = (limit >> 16) & 0xf; |
| 308 | } |
| 309 | |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 310 | static inline void _set_gate(int gate, unsigned type, void *addr, |
Joe Perches | c1773a1 | 2008-03-23 01:01:58 -0700 | [diff] [blame] | 311 | unsigned dpl, unsigned ist, unsigned seg) |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 312 | { |
| 313 | gate_desc s; |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 314 | |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 315 | pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg); |
| 316 | /* |
| 317 | * does not need to be atomic because it is only done once at |
| 318 | * setup time |
| 319 | */ |
| 320 | write_idt_entry(idt_table, gate, &s); |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * This needs to use 'idt_table' rather than 'idt', and |
| 325 | * thus use the _nonmapped_ version of the IDT, as the |
| 326 | * Pentium F0 0F bugfix can have resulted in the mapped |
| 327 | * IDT being write-protected. |
| 328 | */ |
| 329 | static inline void set_intr_gate(unsigned int n, void *addr) |
| 330 | { |
| 331 | BUG_ON((unsigned)n > 0xFF); |
| 332 | _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS); |
| 333 | } |
| 334 | |
Alan Mayer | 305b92a | 2008-04-15 15:36:56 -0500 | [diff] [blame] | 335 | extern int first_system_vector; |
Yinghai Lu | b77b881 | 2008-12-19 15:23:44 -0800 | [diff] [blame] | 336 | /* used_vectors is BITMAP for irq is not managed by percpu vector_irq */ |
| 337 | extern unsigned long used_vectors[]; |
Alan Mayer | 305b92a | 2008-04-15 15:36:56 -0500 | [diff] [blame] | 338 | |
| 339 | static inline void alloc_system_vector(int vector) |
| 340 | { |
Yinghai Lu | b77b881 | 2008-12-19 15:23:44 -0800 | [diff] [blame] | 341 | if (!test_bit(vector, used_vectors)) { |
| 342 | set_bit(vector, used_vectors); |
Alan Mayer | 305b92a | 2008-04-15 15:36:56 -0500 | [diff] [blame] | 343 | if (first_system_vector > vector) |
| 344 | first_system_vector = vector; |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 345 | } else { |
Alan Mayer | 305b92a | 2008-04-15 15:36:56 -0500 | [diff] [blame] | 346 | BUG(); |
Ingo Molnar | 9a3865b | 2011-05-27 09:29:32 +0200 | [diff] [blame] | 347 | } |
Alan Mayer | 305b92a | 2008-04-15 15:36:56 -0500 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | static inline void alloc_intr_gate(unsigned int n, void *addr) |
| 351 | { |
| 352 | alloc_system_vector(n); |
| 353 | set_intr_gate(n, addr); |
| 354 | } |
| 355 | |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 356 | /* |
| 357 | * This routine sets up an interrupt gate at directory privilege level 3. |
| 358 | */ |
| 359 | static inline void set_system_intr_gate(unsigned int n, void *addr) |
| 360 | { |
| 361 | BUG_ON((unsigned)n > 0xFF); |
| 362 | _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS); |
| 363 | } |
| 364 | |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 365 | static inline void set_system_trap_gate(unsigned int n, void *addr) |
| 366 | { |
| 367 | BUG_ON((unsigned)n > 0xFF); |
| 368 | _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS); |
| 369 | } |
| 370 | |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 371 | static inline void set_trap_gate(unsigned int n, void *addr) |
| 372 | { |
| 373 | BUG_ON((unsigned)n > 0xFF); |
| 374 | _set_gate(n, GATE_TRAP, addr, 0, 0, __KERNEL_CS); |
| 375 | } |
| 376 | |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 377 | static inline void set_task_gate(unsigned int n, unsigned int gdt_entry) |
| 378 | { |
| 379 | BUG_ON((unsigned)n > 0xFF); |
| 380 | _set_gate(n, GATE_TASK, (void *)0, 0, 0, (gdt_entry<<3)); |
| 381 | } |
| 382 | |
| 383 | static inline void set_intr_gate_ist(int n, void *addr, unsigned ist) |
| 384 | { |
| 385 | BUG_ON((unsigned)n > 0xFF); |
| 386 | _set_gate(n, GATE_INTERRUPT, addr, 0, ist, __KERNEL_CS); |
| 387 | } |
| 388 | |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 389 | static inline void set_system_intr_gate_ist(int n, void *addr, unsigned ist) |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 390 | { |
| 391 | BUG_ON((unsigned)n > 0xFF); |
| 392 | _set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS); |
| 393 | } |
Glauber de Oliveira Costa | cc69785 | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 394 | |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 395 | #endif /* _ASM_X86_DESC_H */ |