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H. Peter Anvin1965aae2008-10-22 22:26:29 -07001#ifndef _ASM_X86_DESC_H
2#define _ASM_X86_DESC_H
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +01003
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +01004#include <asm/desc_defs.h>
5#include <asm/ldt.h>
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +01006#include <asm/mmu.h>
Ingo Molnar9a3865b2011-05-27 09:29:32 +02007
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +01008#include <linux/smp.h>
Alex Shic6ae41e2012-05-11 15:35:27 +08009#include <linux/percpu.h>
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +010010
Ingo Molnar9a3865b2011-05-27 09:29:32 +020011static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *info)
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +010012{
Ingo Molnar9a3865b2011-05-27 09:29:32 +020013 desc->limit0 = info->limit & 0x0ffff;
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +010014
Ingo Molnar9a3865b2011-05-27 09:29:32 +020015 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;
Jeremy Fitzhardinge64f53a02008-07-27 08:42:32 -070030 /*
Andy Lutomirski318f5a22011-08-03 09:31:53 -040031 * Don't allow setting of the lm bit. It would confuse
32 * user_64bit_mode and would get overridden by sysret anyway.
Jeremy Fitzhardinge64f53a02008-07-27 08:42:32 -070033 */
Ingo Molnar9a3865b2011-05-27 09:29:32 +020034 desc->l = 0;
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +010035}
36
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +010037extern struct desc_ptr idt_descr;
38extern gate_desc idt_table[];
Seiji Aguchi629f4f92013-06-20 11:45:44 -040039extern struct desc_ptr debug_idt_descr;
40extern gate_desc debug_idt_table[];
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +010041
Glauber Costaa9390982008-05-28 16:19:53 -070042struct gdt_page {
43 struct desc_struct gdt[GDT_ENTRIES];
44} __attribute__((aligned(PAGE_SIZE)));
Ingo Molnar9a3865b2011-05-27 09:29:32 +020045
David Howells9b8de742009-04-21 23:00:24 +010046DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page);
Glauber Costaa9390982008-05-28 16:19:53 -070047
48static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
49{
50 return per_cpu(gdt_page, cpu).gdt;
51}
52
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010053#ifdef CONFIG_X86_64
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010054
55static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
56 unsigned dpl, unsigned ist, unsigned seg)
57{
Ingo Molnar9a3865b2011-05-27 09:29:32 +020058 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);
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010068}
69
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010070#else
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010071static inline void pack_gate(gate_desc *gate, unsigned char type,
Joe Perchesc1773a12008-03-23 01:01:58 -070072 unsigned long base, unsigned dpl, unsigned flags,
73 unsigned short seg)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010074{
75 gate->a = (seg << 16) | (base & 0xffff);
Ingo Molnar9a3865b2011-05-27 09:29:32 +020076 gate->b = (base & 0xffff0000) | (((0x80 | type | (dpl << 5)) & 0xff) << 8);
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010077}
78
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010079#endif
80
Glauber de Oliveira Costa746ff602008-01-30 13:31:27 +010081static inline int desc_empty(const void *ptr)
82{
83 const u32 *desc = ptr;
Ingo Molnar9a3865b2011-05-27 09:29:32 +020084
Glauber de Oliveira Costa746ff602008-01-30 13:31:27 +010085 return !(desc[0] | desc[1]);
86}
87
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010088#ifdef CONFIG_PARAVIRT
89#include <asm/paravirt.h>
90#else
Ingo Molnar9a3865b2011-05-27 09:29:32 +020091#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))
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010096
Ingo Molnar9a3865b2011-05-27 09:29:32 +020097#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())
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100100
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200101#define load_TLS(t, cpu) native_load_tls(t, cpu)
102#define set_ldt native_set_ldt
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100103
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200104#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)
Jeremy Fitzhardinge38ffbe62008-07-23 14:21:18 -0700107
108static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
109{
110}
111
112static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
113{
114}
115#endif /* CONFIG_PARAVIRT */
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100116
Jaswinder Singh Rajput8229d752009-03-11 19:13:49 +0530117#define store_ldt(ldt) asm("sldt %0" : "=m"(ldt))
118
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200119static inline void native_write_idt_entry(gate_desc *idt, int entry, const gate_desc *gate)
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100120{
121 memcpy(&idt[entry], gate, sizeof(*gate));
122}
123
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200124static inline void native_write_ldt_entry(struct desc_struct *ldt, int entry, const void *desc)
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100125{
126 memcpy(&ldt[entry], desc, 8);
127}
128
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200129static inline void
130native_write_gdt_entry(struct desc_struct *gdt, int entry, const void *desc, int type)
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100131{
132 unsigned int size;
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200133
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100134 switch (type) {
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200135 case DESC_TSS: size = sizeof(tss_desc); break;
136 case DESC_LDT: size = sizeof(ldt_desc); break;
137 default: size = sizeof(*gdt); break;
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100138 }
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200139
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100140 memcpy(&gdt[entry], desc, size);
141}
142
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100143static 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) |
Joe Perchesc1773a12008-03-23 01:01:58 -0700149 (limit & 0x000f0000) | ((type & 0xff) << 8) |
150 ((flags & 0xf) << 20);
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100151 desc->p = 1;
152}
153
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100154
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200155static inline void set_tssldt_descriptor(void *d, unsigned long addr, unsigned type, unsigned size)
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100156{
157#ifdef CONFIG_X86_64
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100158 struct ldttss_desc64 *desc = d;
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200159
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100160 memset(desc, 0, sizeof(*desc));
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200161
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);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100170#else
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100171 pack_descriptor((struct desc_struct *)d, addr, size, 0x80 | type, 0);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100172#endif
173}
174
175static 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 */
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100187 set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS,
Joe Perchesc1773a12008-03-23 01:01:58 -0700188 IO_BITMAP_OFFSET + IO_BITMAP_BYTES +
189 sizeof(unsigned long) - 1);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100190 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
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100195static inline void native_set_ldt(const void *addr, unsigned int entries)
196{
197 if (likely(entries == 0))
Joe Perchesc1773a12008-03-23 01:01:58 -0700198 asm volatile("lldt %w0"::"q" (0));
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100199 else {
200 unsigned cpu = smp_processor_id();
201 ldt_desc ldt;
202
Michael Karcher5ac37f82008-07-11 18:04:46 +0200203 set_tssldt_descriptor(&ldt, (unsigned long)addr, DESC_LDT,
204 entries * LDT_ENTRY_SIZE - 1);
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100205 write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT,
206 &ldt, DESC_LDT);
Joe Perchesc1773a12008-03-23 01:01:58 -0700207 asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100208 }
209}
210
211static inline void native_load_tr_desc(void)
212{
213 asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
214}
215
216static inline void native_load_gdt(const struct desc_ptr *dtr)
217{
218 asm volatile("lgdt %0"::"m" (*dtr));
219}
220
221static inline void native_load_idt(const struct desc_ptr *dtr)
222{
223 asm volatile("lidt %0"::"m" (*dtr));
224}
225
226static inline void native_store_gdt(struct desc_ptr *dtr)
227{
228 asm volatile("sgdt %0":"=m" (*dtr));
229}
230
231static inline void native_store_idt(struct desc_ptr *dtr)
232{
233 asm volatile("sidt %0":"=m" (*dtr));
234}
235
236static inline unsigned long native_store_tr(void)
237{
238 unsigned long tr;
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200239
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100240 asm volatile("str %0":"=r" (tr));
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200241
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100242 return tr;
243}
244
245static inline void native_load_tls(struct thread_struct *t, unsigned int cpu)
246{
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100247 struct desc_struct *gdt = get_cpu_gdt_table(cpu);
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200248 unsigned int i;
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100249
250 for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
251 gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i];
252}
253
Andy Lutomirskie30ab182015-01-22 11:27:58 -0800254/* This intentionally ignores lm, since 32-bit apps don't have that field. */
255#define LDT_empty(info) \
Joe Perchesc1773a12008-03-23 01:01:58 -0700256 ((info)->base_addr == 0 && \
257 (info)->limit == 0 && \
258 (info)->contents == 0 && \
259 (info)->read_exec_only == 1 && \
260 (info)->seg_32bit == 0 && \
261 (info)->limit_in_pages == 0 && \
262 (info)->seg_not_present == 1 && \
263 (info)->useable == 0)
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100264
Andy Lutomirski3669ef92015-01-22 11:27:59 -0800265/* Lots of programs expect an all-zero user_desc to mean "no segment at all". */
266static inline bool LDT_zero(const struct user_desc *info)
267{
268 return (info->base_addr == 0 &&
269 info->limit == 0 &&
270 info->contents == 0 &&
271 info->read_exec_only == 0 &&
272 info->seg_32bit == 0 &&
273 info->limit_in_pages == 0 &&
274 info->seg_not_present == 0 &&
275 info->useable == 0);
276}
277
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100278static inline void clear_LDT(void)
279{
280 set_ldt(NULL, 0);
281}
282
283/*
284 * load one particular LDT into the current CPU
285 */
286static inline void load_LDT_nolock(mm_context_t *pc)
287{
288 set_ldt(pc->ldt, pc->size);
289}
290
291static inline void load_LDT(mm_context_t *pc)
292{
293 preempt_disable();
294 load_LDT_nolock(pc);
295 preempt_enable();
296}
297
Roland McGrath1bd57182008-01-30 13:31:51 +0100298static inline unsigned long get_desc_base(const struct desc_struct *desc)
Glauber de Oliveira Costacc697852008-01-30 13:31:14 +0100299{
Chris Lalancette2c759102009-11-05 11:47:08 +0100300 return (unsigned)(desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24));
Glauber de Oliveira Costacc697852008-01-30 13:31:14 +0100301}
Roland McGrath1bd57182008-01-30 13:31:51 +0100302
Akinobu Mita57594742009-07-19 00:11:06 +0900303static inline void set_desc_base(struct desc_struct *desc, unsigned long base)
304{
305 desc->base0 = base & 0xffff;
306 desc->base1 = (base >> 16) & 0xff;
307 desc->base2 = (base >> 24) & 0xff;
308}
309
Roland McGrath1bd57182008-01-30 13:31:51 +0100310static inline unsigned long get_desc_limit(const struct desc_struct *desc)
311{
312 return desc->limit0 | (desc->limit << 16);
313}
314
Akinobu Mita57594742009-07-19 00:11:06 +0900315static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit)
316{
317 desc->limit0 = limit & 0xffff;
318 desc->limit = (limit >> 16) & 0xf;
319}
320
Steven Rostedt228bdaa2011-12-09 03:02:19 -0500321#ifdef CONFIG_X86_64
322static inline void set_nmi_gate(int gate, void *addr)
323{
324 gate_desc s;
325
326 pack_gate(&s, GATE_INTERRUPT, (unsigned long)addr, 0, 0, __KERNEL_CS);
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400327 write_idt_entry(debug_idt_table, gate, &s);
Steven Rostedt228bdaa2011-12-09 03:02:19 -0500328}
329#endif
330
Seiji Aguchicf910e82013-06-20 11:46:53 -0400331#ifdef CONFIG_TRACING
332extern struct desc_ptr trace_idt_descr;
333extern gate_desc trace_idt_table[];
334static inline void write_trace_idt_entry(int entry, const gate_desc *gate)
335{
336 write_idt_entry(trace_idt_table, entry, gate);
337}
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400338
339static inline void _trace_set_gate(int gate, unsigned type, void *addr,
340 unsigned dpl, unsigned ist, unsigned seg)
341{
342 gate_desc s;
343
344 pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg);
345 /*
346 * does not need to be atomic because it is only done once at
347 * setup time
348 */
349 write_trace_idt_entry(gate, &s);
350}
Seiji Aguchicf910e82013-06-20 11:46:53 -0400351#else
352static inline void write_trace_idt_entry(int entry, const gate_desc *gate)
353{
354}
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400355
356#define _trace_set_gate(gate, type, addr, dpl, ist, seg)
Seiji Aguchicf910e82013-06-20 11:46:53 -0400357#endif
358
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100359static inline void _set_gate(int gate, unsigned type, void *addr,
Joe Perchesc1773a12008-03-23 01:01:58 -0700360 unsigned dpl, unsigned ist, unsigned seg)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100361{
362 gate_desc s;
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200363
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100364 pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg);
365 /*
366 * does not need to be atomic because it is only done once at
367 * setup time
368 */
369 write_idt_entry(idt_table, gate, &s);
Seiji Aguchicf910e82013-06-20 11:46:53 -0400370 write_trace_idt_entry(gate, &s);
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100371}
372
373/*
374 * This needs to use 'idt_table' rather than 'idt', and
375 * thus use the _nonmapped_ version of the IDT, as the
376 * Pentium F0 0F bugfix can have resulted in the mapped
377 * IDT being write-protected.
378 */
Wang Nan5eca7452015-02-27 12:19:49 +0800379#define set_intr_gate_notrace(n, addr) \
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400380 do { \
381 BUG_ON((unsigned)n > 0xFF); \
382 _set_gate(n, GATE_INTERRUPT, (void *)addr, 0, 0, \
383 __KERNEL_CS); \
Wang Nan5eca7452015-02-27 12:19:49 +0800384 } while (0)
385
386#define set_intr_gate(n, addr) \
387 do { \
388 set_intr_gate_notrace(n, addr); \
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400389 _trace_set_gate(n, GATE_INTERRUPT, (void *)trace_##addr,\
390 0, 0, __KERNEL_CS); \
391 } while (0)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100392
Alan Mayer305b92a2008-04-15 15:36:56 -0500393extern int first_system_vector;
Yinghai Lub77b8812008-12-19 15:23:44 -0800394/* used_vectors is BITMAP for irq is not managed by percpu vector_irq */
395extern unsigned long used_vectors[];
Alan Mayer305b92a2008-04-15 15:36:56 -0500396
397static inline void alloc_system_vector(int vector)
398{
Yinghai Lub77b8812008-12-19 15:23:44 -0800399 if (!test_bit(vector, used_vectors)) {
400 set_bit(vector, used_vectors);
Alan Mayer305b92a2008-04-15 15:36:56 -0500401 if (first_system_vector > vector)
402 first_system_vector = vector;
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200403 } else {
Alan Mayer305b92a2008-04-15 15:36:56 -0500404 BUG();
Ingo Molnar9a3865b2011-05-27 09:29:32 +0200405 }
Alan Mayer305b92a2008-04-15 15:36:56 -0500406}
407
Seiji Aguchicf910e82013-06-20 11:46:53 -0400408#define alloc_intr_gate(n, addr) \
409 do { \
410 alloc_system_vector(n); \
Seiji Aguchi959c0712013-10-30 16:36:08 -0400411 set_intr_gate(n, addr); \
Seiji Aguchicf910e82013-06-20 11:46:53 -0400412 } while (0)
413
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100414/*
415 * This routine sets up an interrupt gate at directory privilege level 3.
416 */
417static inline void set_system_intr_gate(unsigned int n, void *addr)
418{
419 BUG_ON((unsigned)n > 0xFF);
420 _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
421}
422
Alexander van Heukelum699d2932008-10-03 22:00:32 +0200423static inline void set_system_trap_gate(unsigned int n, void *addr)
424{
425 BUG_ON((unsigned)n > 0xFF);
426 _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS);
427}
428
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100429static inline void set_trap_gate(unsigned int n, void *addr)
430{
431 BUG_ON((unsigned)n > 0xFF);
432 _set_gate(n, GATE_TRAP, addr, 0, 0, __KERNEL_CS);
433}
434
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100435static inline void set_task_gate(unsigned int n, unsigned int gdt_entry)
436{
437 BUG_ON((unsigned)n > 0xFF);
438 _set_gate(n, GATE_TASK, (void *)0, 0, 0, (gdt_entry<<3));
439}
440
441static inline void set_intr_gate_ist(int n, void *addr, unsigned ist)
442{
443 BUG_ON((unsigned)n > 0xFF);
444 _set_gate(n, GATE_INTERRUPT, addr, 0, ist, __KERNEL_CS);
445}
446
Alexander van Heukelum699d2932008-10-03 22:00:32 +0200447static inline void set_system_intr_gate_ist(int n, void *addr, unsigned ist)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100448{
449 BUG_ON((unsigned)n > 0xFF);
450 _set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS);
451}
Glauber de Oliveira Costacc697852008-01-30 13:31:14 +0100452
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400453#ifdef CONFIG_X86_64
454DECLARE_PER_CPU(u32, debug_idt_ctr);
455static inline bool is_debug_idt_enabled(void)
456{
457 if (this_cpu_read(debug_idt_ctr))
458 return true;
459
460 return false;
461}
462
463static inline void load_debug_idt(void)
464{
465 load_idt((const struct desc_ptr *)&debug_idt_descr);
466}
467#else
468static inline bool is_debug_idt_enabled(void)
469{
470 return false;
471}
472
473static inline void load_debug_idt(void)
474{
475}
476#endif
477
Seiji Aguchicf910e82013-06-20 11:46:53 -0400478#ifdef CONFIG_TRACING
479extern atomic_t trace_idt_ctr;
480static inline bool is_trace_idt_enabled(void)
481{
482 if (atomic_read(&trace_idt_ctr))
483 return true;
484
485 return false;
486}
487
488static inline void load_trace_idt(void)
489{
490 load_idt((const struct desc_ptr *)&trace_idt_descr);
491}
492#else
493static inline bool is_trace_idt_enabled(void)
494{
495 return false;
496}
497
498static inline void load_trace_idt(void)
499{
500}
501#endif
502
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400503/*
Steven Rostedt (Red Hat)2b4bc782013-06-22 13:16:19 -0400504 * The load_current_idt() must be called with interrupts disabled
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400505 * to avoid races. That way the IDT will always be set back to the expected
Steven Rostedt (Red Hat)2b4bc782013-06-22 13:16:19 -0400506 * descriptor. It's also called when a CPU is being initialized, and
507 * that doesn't need to disable interrupts, as nothing should be
508 * bothering the CPU then.
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400509 */
510static inline void load_current_idt(void)
511{
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400512 if (is_debug_idt_enabled())
513 load_debug_idt();
Seiji Aguchicf910e82013-06-20 11:46:53 -0400514 else if (is_trace_idt_enabled())
515 load_trace_idt();
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400516 else
517 load_idt((const struct desc_ptr *)&idt_descr);
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400518}
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700519#endif /* _ASM_X86_DESC_H */