Commit | Line | Data |
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1965aae3 PA |
1 | #ifndef _ASM_X86_DESC_H |
2 | #define _ASM_X86_DESC_H | |
80fbb69a | 3 | |
80fbb69a GOC |
4 | #include <asm/desc_defs.h> |
5 | #include <asm/ldt.h> | |
881c2975 | 6 | #include <asm/mmu.h> |
9a3865b1 | 7 | |
54cd0eac | 8 | #include <linux/smp.h> |
c6ae41e7 | 9 | #include <linux/percpu.h> |
80fbb69a | 10 | |
9a3865b1 IM |
11 | static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *info) |
12 | { | |
13 | desc->limit0 = info->limit & 0x0ffff; | |
14 | ||
15 | desc->base0 = (info->base_addr & 0x0000ffff); | |
16 | desc->base1 = (info->base_addr & 0x00ff0000) >> 16; | |
17 | ||
18 | desc->type = (info->read_exec_only ^ 1) << 1; | |
19 | desc->type |= info->contents << 2; | |
20 | ||
21 | desc->s = 1; | |
22 | desc->dpl = 0x3; | |
23 | desc->p = info->seg_not_present ^ 1; | |
24 | desc->limit = (info->limit & 0xf0000) >> 16; | |
25 | desc->avl = info->useable; | |
26 | desc->d = info->seg_32bit; | |
27 | desc->g = info->limit_in_pages; | |
28 | ||
29 | desc->base2 = (info->base_addr & 0xff000000) >> 24; | |
64f53a04 | 30 | /* |
318f5a2a AL |
31 | * Don't allow setting of the lm bit. It would confuse |
32 | * user_64bit_mode and would get overridden by sysret anyway. | |
64f53a04 | 33 | */ |
9a3865b1 | 34 | desc->l = 0; |
80fbb69a GOC |
35 | } |
36 | ||
881c2975 GOC |
37 | extern struct desc_ptr idt_descr; |
38 | extern gate_desc idt_table[]; | |
228bdaa9 SR |
39 | extern struct desc_ptr nmi_idt_descr; |
40 | extern gate_desc nmi_idt_table[]; | |
80fbb69a | 41 | |
a939098a GC |
42 | struct gdt_page { |
43 | struct desc_struct gdt[GDT_ENTRIES]; | |
44 | } __attribute__((aligned(PAGE_SIZE))); | |
9a3865b1 | 45 | |
9b8de747 | 46 | DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page); |
a939098a GC |
47 | |
48 | static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu) | |
49 | { | |
50 | return per_cpu(gdt_page, cpu).gdt; | |
51 | } | |
52 | ||
54cd0eac | 53 | #ifdef CONFIG_X86_64 |
507f90c9 GOC |
54 | |
55 | static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func, | |
56 | unsigned dpl, unsigned ist, unsigned seg) | |
57 | { | |
9a3865b1 IM |
58 | gate->offset_low = PTR_LOW(func); |
59 | gate->segment = __KERNEL_CS; | |
60 | gate->ist = ist; | |
61 | gate->p = 1; | |
62 | gate->dpl = dpl; | |
63 | gate->zero0 = 0; | |
64 | gate->zero1 = 0; | |
65 | gate->type = type; | |
66 | gate->offset_middle = PTR_MIDDLE(func); | |
67 | gate->offset_high = PTR_HIGH(func); | |
507f90c9 GOC |
68 | } |
69 | ||
54cd0eac | 70 | #else |
507f90c9 | 71 | static inline void pack_gate(gate_desc *gate, unsigned char type, |
c1773a16 JP |
72 | unsigned long base, unsigned dpl, unsigned flags, |
73 | unsigned short seg) | |
507f90c9 GOC |
74 | { |
75 | gate->a = (seg << 16) | (base & 0xffff); | |
9a3865b1 | 76 | gate->b = (base & 0xffff0000) | (((0x80 | type | (dpl << 5)) & 0xff) << 8); |
507f90c9 GOC |
77 | } |
78 | ||
54cd0eac GOC |
79 | #endif |
80 | ||
746ff60f GOC |
81 | static inline int desc_empty(const void *ptr) |
82 | { | |
83 | const u32 *desc = ptr; | |
9a3865b1 | 84 | |
746ff60f GOC |
85 | return !(desc[0] | desc[1]); |
86 | } | |
87 | ||
54cd0eac GOC |
88 | #ifdef CONFIG_PARAVIRT |
89 | #include <asm/paravirt.h> | |
90 | #else | |
9a3865b1 IM |
91 | #define load_TR_desc() native_load_tr_desc() |
92 | #define load_gdt(dtr) native_load_gdt(dtr) | |
93 | #define load_idt(dtr) native_load_idt(dtr) | |
94 | #define load_tr(tr) asm volatile("ltr %0"::"m" (tr)) | |
95 | #define load_ldt(ldt) asm volatile("lldt %0"::"m" (ldt)) | |
96 | ||
97 | #define store_gdt(dtr) native_store_gdt(dtr) | |
98 | #define store_idt(dtr) native_store_idt(dtr) | |
99 | #define store_tr(tr) (tr = native_store_tr()) | |
100 | ||
101 | #define load_TLS(t, cpu) native_load_tls(t, cpu) | |
102 | #define set_ldt native_set_ldt | |
103 | ||
104 | #define write_ldt_entry(dt, entry, desc) native_write_ldt_entry(dt, entry, desc) | |
105 | #define write_gdt_entry(dt, entry, desc, type) native_write_gdt_entry(dt, entry, desc, type) | |
106 | #define write_idt_entry(dt, entry, g) native_write_idt_entry(dt, entry, g) | |
38ffbe66 JF |
107 | |
108 | static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries) | |
109 | { | |
110 | } | |
111 | ||
112 | static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries) | |
113 | { | |
114 | } | |
115 | #endif /* CONFIG_PARAVIRT */ | |
54cd0eac | 116 | |
8229d754 JSR |
117 | #define store_ldt(ldt) asm("sldt %0" : "=m"(ldt)) |
118 | ||
9a3865b1 | 119 | static inline void native_write_idt_entry(gate_desc *idt, int entry, const gate_desc *gate) |
54cd0eac GOC |
120 | { |
121 | memcpy(&idt[entry], gate, sizeof(*gate)); | |
122 | } | |
123 | ||
9a3865b1 | 124 | static inline void native_write_ldt_entry(struct desc_struct *ldt, int entry, const void *desc) |
54cd0eac GOC |
125 | { |
126 | memcpy(&ldt[entry], desc, 8); | |
127 | } | |
128 | ||
9a3865b1 IM |
129 | static inline void |
130 | native_write_gdt_entry(struct desc_struct *gdt, int entry, const void *desc, int type) | |
54cd0eac GOC |
131 | { |
132 | unsigned int size; | |
9a3865b1 | 133 | |
54cd0eac | 134 | switch (type) { |
9a3865b1 IM |
135 | case DESC_TSS: size = sizeof(tss_desc); break; |
136 | case DESC_LDT: size = sizeof(ldt_desc); break; | |
137 | default: size = sizeof(*gdt); break; | |
54cd0eac | 138 | } |
9a3865b1 | 139 | |
54cd0eac GOC |
140 | memcpy(&gdt[entry], desc, size); |
141 | } | |
142 | ||
54cd0eac GOC |
143 | static inline void pack_descriptor(struct desc_struct *desc, unsigned long base, |
144 | unsigned long limit, unsigned char type, | |
145 | unsigned char flags) | |
146 | { | |
147 | desc->a = ((base & 0xffff) << 16) | (limit & 0xffff); | |
148 | desc->b = (base & 0xff000000) | ((base & 0xff0000) >> 16) | | |
c1773a16 JP |
149 | (limit & 0x000f0000) | ((type & 0xff) << 8) | |
150 | ((flags & 0xf) << 20); | |
54cd0eac GOC |
151 | desc->p = 1; |
152 | } | |
153 | ||
54cd0eac | 154 | |
9a3865b1 | 155 | static inline void set_tssldt_descriptor(void *d, unsigned long addr, unsigned type, unsigned size) |
c81c6ca4 GOC |
156 | { |
157 | #ifdef CONFIG_X86_64 | |
f6e0eba1 | 158 | struct ldttss_desc64 *desc = d; |
9a3865b1 | 159 | |
f6e0eba1 | 160 | memset(desc, 0, sizeof(*desc)); |
9a3865b1 IM |
161 | |
162 | desc->limit0 = size & 0xFFFF; | |
163 | desc->base0 = PTR_LOW(addr); | |
164 | desc->base1 = PTR_MIDDLE(addr) & 0xFF; | |
165 | desc->type = type; | |
166 | desc->p = 1; | |
167 | desc->limit1 = (size >> 16) & 0xF; | |
168 | desc->base2 = (PTR_MIDDLE(addr) >> 8) & 0xFF; | |
169 | desc->base3 = PTR_HIGH(addr); | |
c81c6ca4 | 170 | #else |
f6e0eba1 | 171 | pack_descriptor((struct desc_struct *)d, addr, size, 0x80 | type, 0); |
c81c6ca4 GOC |
172 | #endif |
173 | } | |
174 | ||
175 | static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr) | |
176 | { | |
177 | struct desc_struct *d = get_cpu_gdt_table(cpu); | |
178 | tss_desc tss; | |
179 | ||
180 | /* | |
181 | * sizeof(unsigned long) coming from an extra "long" at the end | |
182 | * of the iobitmap. See tss_struct definition in processor.h | |
183 | * | |
184 | * -1? seg base+limit should be pointing to the address of the | |
185 | * last valid byte | |
186 | */ | |
f6e0eba1 | 187 | set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, |
c1773a16 JP |
188 | IO_BITMAP_OFFSET + IO_BITMAP_BYTES + |
189 | sizeof(unsigned long) - 1); | |
c81c6ca4 GOC |
190 | write_gdt_entry(d, entry, &tss, DESC_TSS); |
191 | } | |
192 | ||
193 | #define set_tss_desc(cpu, addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr) | |
194 | ||
54cd0eac GOC |
195 | static inline void native_set_ldt(const void *addr, unsigned int entries) |
196 | { | |
197 | if (likely(entries == 0)) | |
c1773a16 | 198 | asm volatile("lldt %w0"::"q" (0)); |
54cd0eac GOC |
199 | else { |
200 | unsigned cpu = smp_processor_id(); | |
201 | ldt_desc ldt; | |
202 | ||
5ac37f87 MK |
203 | set_tssldt_descriptor(&ldt, (unsigned long)addr, DESC_LDT, |
204 | entries * LDT_ENTRY_SIZE - 1); | |
54cd0eac GOC |
205 | write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, |
206 | &ldt, DESC_LDT); | |
c1773a16 | 207 | asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8)); |
54cd0eac GOC |
208 | } |
209 | } | |
210 | ||
211 | static inline void native_load_tr_desc(void) | |
212 | { | |
213 | asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8)); | |
214 | } | |
215 | ||
216 | static inline void native_load_gdt(const struct desc_ptr *dtr) | |
217 | { | |
218 | asm volatile("lgdt %0"::"m" (*dtr)); | |
219 | } | |
220 | ||
221 | static inline void native_load_idt(const struct desc_ptr *dtr) | |
222 | { | |
223 | asm volatile("lidt %0"::"m" (*dtr)); | |
224 | } | |
225 | ||
226 | static inline void native_store_gdt(struct desc_ptr *dtr) | |
227 | { | |
228 | asm volatile("sgdt %0":"=m" (*dtr)); | |
229 | } | |
230 | ||
231 | static inline void native_store_idt(struct desc_ptr *dtr) | |
232 | { | |
233 | asm volatile("sidt %0":"=m" (*dtr)); | |
234 | } | |
235 | ||
236 | static inline unsigned long native_store_tr(void) | |
237 | { | |
238 | unsigned long tr; | |
9a3865b1 | 239 | |
54cd0eac | 240 | asm volatile("str %0":"=r" (tr)); |
9a3865b1 | 241 | |
54cd0eac GOC |
242 | return tr; |
243 | } | |
244 | ||
245 | static inline void native_load_tls(struct thread_struct *t, unsigned int cpu) | |
246 | { | |
54cd0eac | 247 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); |
9a3865b1 | 248 | unsigned int i; |
54cd0eac GOC |
249 | |
250 | for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++) | |
251 | gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i]; | |
252 | } | |
253 | ||
c1773a16 JP |
254 | #define _LDT_empty(info) \ |
255 | ((info)->base_addr == 0 && \ | |
256 | (info)->limit == 0 && \ | |
257 | (info)->contents == 0 && \ | |
258 | (info)->read_exec_only == 1 && \ | |
259 | (info)->seg_32bit == 0 && \ | |
260 | (info)->limit_in_pages == 0 && \ | |
261 | (info)->seg_not_present == 1 && \ | |
262 | (info)->useable == 0) | |
881c2975 GOC |
263 | |
264 | #ifdef CONFIG_X86_64 | |
265 | #define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0)) | |
266 | #else | |
267 | #define LDT_empty(info) (_LDT_empty(info)) | |
268 | #endif | |
269 | ||
270 | static inline void clear_LDT(void) | |
271 | { | |
272 | set_ldt(NULL, 0); | |
273 | } | |
274 | ||
275 | /* | |
276 | * load one particular LDT into the current CPU | |
277 | */ | |
278 | static inline void load_LDT_nolock(mm_context_t *pc) | |
279 | { | |
280 | set_ldt(pc->ldt, pc->size); | |
281 | } | |
282 | ||
283 | static inline void load_LDT(mm_context_t *pc) | |
284 | { | |
285 | preempt_disable(); | |
286 | load_LDT_nolock(pc); | |
287 | preempt_enable(); | |
288 | } | |
289 | ||
1bd5718c | 290 | static inline unsigned long get_desc_base(const struct desc_struct *desc) |
cc697852 | 291 | { |
2c75910f | 292 | return (unsigned)(desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24)); |
cc697852 | 293 | } |
1bd5718c | 294 | |
57594742 AM |
295 | static inline void set_desc_base(struct desc_struct *desc, unsigned long base) |
296 | { | |
297 | desc->base0 = base & 0xffff; | |
298 | desc->base1 = (base >> 16) & 0xff; | |
299 | desc->base2 = (base >> 24) & 0xff; | |
300 | } | |
301 | ||
1bd5718c RM |
302 | static inline unsigned long get_desc_limit(const struct desc_struct *desc) |
303 | { | |
304 | return desc->limit0 | (desc->limit << 16); | |
305 | } | |
306 | ||
57594742 AM |
307 | static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit) |
308 | { | |
309 | desc->limit0 = limit & 0xffff; | |
310 | desc->limit = (limit >> 16) & 0xf; | |
311 | } | |
312 | ||
228bdaa9 SR |
313 | #ifdef CONFIG_X86_64 |
314 | static inline void set_nmi_gate(int gate, void *addr) | |
315 | { | |
316 | gate_desc s; | |
317 | ||
318 | pack_gate(&s, GATE_INTERRUPT, (unsigned long)addr, 0, 0, __KERNEL_CS); | |
319 | write_idt_entry(nmi_idt_table, gate, &s); | |
320 | } | |
321 | #endif | |
322 | ||
507f90c9 | 323 | static inline void _set_gate(int gate, unsigned type, void *addr, |
c1773a16 | 324 | unsigned dpl, unsigned ist, unsigned seg) |
507f90c9 GOC |
325 | { |
326 | gate_desc s; | |
9a3865b1 | 327 | |
507f90c9 GOC |
328 | pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg); |
329 | /* | |
330 | * does not need to be atomic because it is only done once at | |
331 | * setup time | |
332 | */ | |
333 | write_idt_entry(idt_table, gate, &s); | |
334 | } | |
335 | ||
336 | /* | |
337 | * This needs to use 'idt_table' rather than 'idt', and | |
338 | * thus use the _nonmapped_ version of the IDT, as the | |
339 | * Pentium F0 0F bugfix can have resulted in the mapped | |
340 | * IDT being write-protected. | |
341 | */ | |
342 | static inline void set_intr_gate(unsigned int n, void *addr) | |
343 | { | |
344 | BUG_ON((unsigned)n > 0xFF); | |
345 | _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS); | |
346 | } | |
347 | ||
305b92a2 | 348 | extern int first_system_vector; |
b77b881f YL |
349 | /* used_vectors is BITMAP for irq is not managed by percpu vector_irq */ |
350 | extern unsigned long used_vectors[]; | |
305b92a2 AM |
351 | |
352 | static inline void alloc_system_vector(int vector) | |
353 | { | |
b77b881f YL |
354 | if (!test_bit(vector, used_vectors)) { |
355 | set_bit(vector, used_vectors); | |
305b92a2 AM |
356 | if (first_system_vector > vector) |
357 | first_system_vector = vector; | |
9a3865b1 | 358 | } else { |
305b92a2 | 359 | BUG(); |
9a3865b1 | 360 | } |
305b92a2 AM |
361 | } |
362 | ||
363 | static inline void alloc_intr_gate(unsigned int n, void *addr) | |
364 | { | |
365 | alloc_system_vector(n); | |
366 | set_intr_gate(n, addr); | |
367 | } | |
368 | ||
507f90c9 GOC |
369 | /* |
370 | * This routine sets up an interrupt gate at directory privilege level 3. | |
371 | */ | |
372 | static inline void set_system_intr_gate(unsigned int n, void *addr) | |
373 | { | |
374 | BUG_ON((unsigned)n > 0xFF); | |
375 | _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS); | |
376 | } | |
377 | ||
699d2937 | 378 | static inline void set_system_trap_gate(unsigned int n, void *addr) |
507f90c9 GOC |
379 | { |
380 | BUG_ON((unsigned)n > 0xFF); | |
699d2937 | 381 | _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS); |
507f90c9 GOC |
382 | } |
383 | ||
699d2937 | 384 | static inline void set_trap_gate(unsigned int n, void *addr) |
507f90c9 GOC |
385 | { |
386 | BUG_ON((unsigned)n > 0xFF); | |
699d2937 | 387 | _set_gate(n, GATE_TRAP, addr, 0, 0, __KERNEL_CS); |
507f90c9 GOC |
388 | } |
389 | ||
390 | static inline void set_task_gate(unsigned int n, unsigned int gdt_entry) | |
391 | { | |
392 | BUG_ON((unsigned)n > 0xFF); | |
393 | _set_gate(n, GATE_TASK, (void *)0, 0, 0, (gdt_entry<<3)); | |
394 | } | |
395 | ||
396 | static inline void set_intr_gate_ist(int n, void *addr, unsigned ist) | |
397 | { | |
398 | BUG_ON((unsigned)n > 0xFF); | |
399 | _set_gate(n, GATE_INTERRUPT, addr, 0, ist, __KERNEL_CS); | |
400 | } | |
401 | ||
699d2937 | 402 | static inline void set_system_intr_gate_ist(int n, void *addr, unsigned ist) |
507f90c9 GOC |
403 | { |
404 | BUG_ON((unsigned)n > 0xFF); | |
405 | _set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS); | |
406 | } | |
cc697852 | 407 | |
1965aae3 | 408 | #endif /* _ASM_X86_DESC_H */ |