blob: a44c4dc705902c6b1e76c92d71f1c68f759a0df4 [file] [log] [blame]
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +01001#ifndef _ASM_DESC_H_
2#define _ASM_DESC_H_
3
4#ifndef __ASSEMBLY__
5#include <asm/desc_defs.h>
6#include <asm/ldt.h>
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +01007#include <asm/mmu.h>
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +01008#include <linux/smp.h>
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +01009
Roland McGrath1bd57182008-01-30 13:31:51 +010010static inline void fill_ldt(struct desc_struct *desc,
11 const struct user_desc *info)
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +010012{
13 desc->limit0 = info->limit & 0x0ffff;
14 desc->base0 = info->base_addr & 0x0000ffff;
15
16 desc->base1 = (info->base_addr & 0x00ff0000) >> 16;
17 desc->type = (info->read_exec_only ^ 1) << 1;
18 desc->type |= info->contents << 2;
19 desc->s = 1;
20 desc->dpl = 0x3;
21 desc->p = info->seg_not_present ^ 1;
22 desc->limit = (info->limit & 0xf0000) >> 16;
23 desc->avl = info->useable;
24 desc->d = info->seg_32bit;
25 desc->g = info->limit_in_pages;
26 desc->base2 = (info->base_addr & 0xff000000) >> 24;
27}
28
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +010029extern struct desc_ptr idt_descr;
30extern gate_desc idt_table[];
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +010031
Glauber Costaa9390982008-05-28 16:19:53 -070032struct gdt_page {
33 struct desc_struct gdt[GDT_ENTRIES];
34} __attribute__((aligned(PAGE_SIZE)));
35DECLARE_PER_CPU(struct gdt_page, gdt_page);
36
37static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
38{
39 return per_cpu(gdt_page, cpu).gdt;
40}
41
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010042#ifdef CONFIG_X86_64
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010043
44static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
45 unsigned dpl, unsigned ist, unsigned seg)
46{
47 gate->offset_low = PTR_LOW(func);
48 gate->segment = __KERNEL_CS;
49 gate->ist = ist;
50 gate->p = 1;
51 gate->dpl = dpl;
52 gate->zero0 = 0;
53 gate->zero1 = 0;
54 gate->type = type;
55 gate->offset_middle = PTR_MIDDLE(func);
56 gate->offset_high = PTR_HIGH(func);
57}
58
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010059#else
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010060static inline void pack_gate(gate_desc *gate, unsigned char type,
Joe Perchesc1773a12008-03-23 01:01:58 -070061 unsigned long base, unsigned dpl, unsigned flags,
62 unsigned short seg)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010063{
64 gate->a = (seg << 16) | (base & 0xffff);
65 gate->b = (base & 0xffff0000) |
66 (((0x80 | type | (dpl << 5)) & 0xff) << 8);
67}
68
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010069#endif
70
Glauber de Oliveira Costa746ff602008-01-30 13:31:27 +010071static inline int desc_empty(const void *ptr)
72{
73 const u32 *desc = ptr;
74 return !(desc[0] | desc[1]);
75}
76
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010077#ifdef CONFIG_PARAVIRT
78#include <asm/paravirt.h>
79#else
80#define load_TR_desc() native_load_tr_desc()
81#define load_gdt(dtr) native_load_gdt(dtr)
82#define load_idt(dtr) native_load_idt(dtr)
Joe Perchesc1773a12008-03-23 01:01:58 -070083#define load_tr(tr) asm volatile("ltr %0"::"m" (tr))
84#define load_ldt(ldt) asm volatile("lldt %0"::"m" (ldt))
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010085
86#define store_gdt(dtr) native_store_gdt(dtr)
87#define store_idt(dtr) native_store_idt(dtr)
88#define store_tr(tr) (tr = native_store_tr())
Joe Perchesc1773a12008-03-23 01:01:58 -070089#define store_ldt(ldt) asm("sldt %0":"=m" (ldt))
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010090
91#define load_TLS(t, cpu) native_load_tls(t, cpu)
92#define set_ldt native_set_ldt
93
Joe Perchesc1773a12008-03-23 01:01:58 -070094#define write_ldt_entry(dt, entry, desc) \
95 native_write_ldt_entry(dt, entry, desc)
96#define write_gdt_entry(dt, entry, desc, type) \
97 native_write_gdt_entry(dt, entry, desc, type)
98#define write_idt_entry(dt, entry, g) \
99 native_write_idt_entry(dt, entry, g)
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100100#endif
101
102static inline void native_write_idt_entry(gate_desc *idt, int entry,
103 const gate_desc *gate)
104{
105 memcpy(&idt[entry], gate, sizeof(*gate));
106}
107
108static inline void native_write_ldt_entry(struct desc_struct *ldt, int entry,
109 const void *desc)
110{
111 memcpy(&ldt[entry], desc, 8);
112}
113
114static inline void native_write_gdt_entry(struct desc_struct *gdt, int entry,
115 const void *desc, int type)
116{
117 unsigned int size;
118 switch (type) {
119 case DESC_TSS:
120 size = sizeof(tss_desc);
121 break;
122 case DESC_LDT:
123 size = sizeof(ldt_desc);
124 break;
125 default:
126 size = sizeof(struct desc_struct);
127 break;
128 }
129 memcpy(&gdt[entry], desc, size);
130}
131
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100132static inline void pack_descriptor(struct desc_struct *desc, unsigned long base,
133 unsigned long limit, unsigned char type,
134 unsigned char flags)
135{
136 desc->a = ((base & 0xffff) << 16) | (limit & 0xffff);
137 desc->b = (base & 0xff000000) | ((base & 0xff0000) >> 16) |
Joe Perchesc1773a12008-03-23 01:01:58 -0700138 (limit & 0x000f0000) | ((type & 0xff) << 8) |
139 ((flags & 0xf) << 20);
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100140 desc->p = 1;
141}
142
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100143
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100144static inline void set_tssldt_descriptor(void *d, unsigned long addr,
145 unsigned type, unsigned size)
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100146{
147#ifdef CONFIG_X86_64
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100148 struct ldttss_desc64 *desc = d;
149 memset(desc, 0, sizeof(*desc));
150 desc->limit0 = size & 0xFFFF;
151 desc->base0 = PTR_LOW(addr);
152 desc->base1 = PTR_MIDDLE(addr) & 0xFF;
153 desc->type = type;
154 desc->p = 1;
155 desc->limit1 = (size >> 16) & 0xF;
156 desc->base2 = (PTR_MIDDLE(addr) >> 8) & 0xFF;
157 desc->base3 = PTR_HIGH(addr);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100158#else
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100159 pack_descriptor((struct desc_struct *)d, addr, size, 0x80 | type, 0);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100160#endif
161}
162
163static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr)
164{
165 struct desc_struct *d = get_cpu_gdt_table(cpu);
166 tss_desc tss;
167
168 /*
169 * sizeof(unsigned long) coming from an extra "long" at the end
170 * of the iobitmap. See tss_struct definition in processor.h
171 *
172 * -1? seg base+limit should be pointing to the address of the
173 * last valid byte
174 */
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100175 set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS,
Joe Perchesc1773a12008-03-23 01:01:58 -0700176 IO_BITMAP_OFFSET + IO_BITMAP_BYTES +
177 sizeof(unsigned long) - 1);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100178 write_gdt_entry(d, entry, &tss, DESC_TSS);
179}
180
181#define set_tss_desc(cpu, addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
182
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100183static inline void native_set_ldt(const void *addr, unsigned int entries)
184{
185 if (likely(entries == 0))
Joe Perchesc1773a12008-03-23 01:01:58 -0700186 asm volatile("lldt %w0"::"q" (0));
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100187 else {
188 unsigned cpu = smp_processor_id();
189 ldt_desc ldt;
190
Michael Karcher5ac37f82008-07-11 18:04:46 +0200191 set_tssldt_descriptor(&ldt, (unsigned long)addr, DESC_LDT,
192 entries * LDT_ENTRY_SIZE - 1);
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100193 write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT,
194 &ldt, DESC_LDT);
Joe Perchesc1773a12008-03-23 01:01:58 -0700195 asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100196 }
197}
198
199static inline void native_load_tr_desc(void)
200{
201 asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
202}
203
204static inline void native_load_gdt(const struct desc_ptr *dtr)
205{
206 asm volatile("lgdt %0"::"m" (*dtr));
207}
208
209static inline void native_load_idt(const struct desc_ptr *dtr)
210{
211 asm volatile("lidt %0"::"m" (*dtr));
212}
213
214static inline void native_store_gdt(struct desc_ptr *dtr)
215{
216 asm volatile("sgdt %0":"=m" (*dtr));
217}
218
219static inline void native_store_idt(struct desc_ptr *dtr)
220{
221 asm volatile("sidt %0":"=m" (*dtr));
222}
223
224static inline unsigned long native_store_tr(void)
225{
226 unsigned long tr;
227 asm volatile("str %0":"=r" (tr));
228 return tr;
229}
230
231static inline void native_load_tls(struct thread_struct *t, unsigned int cpu)
232{
233 unsigned int i;
234 struct desc_struct *gdt = get_cpu_gdt_table(cpu);
235
236 for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
237 gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i];
238}
239
Joe Perchesc1773a12008-03-23 01:01:58 -0700240#define _LDT_empty(info) \
241 ((info)->base_addr == 0 && \
242 (info)->limit == 0 && \
243 (info)->contents == 0 && \
244 (info)->read_exec_only == 1 && \
245 (info)->seg_32bit == 0 && \
246 (info)->limit_in_pages == 0 && \
247 (info)->seg_not_present == 1 && \
248 (info)->useable == 0)
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100249
250#ifdef CONFIG_X86_64
251#define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0))
252#else
253#define LDT_empty(info) (_LDT_empty(info))
254#endif
255
256static inline void clear_LDT(void)
257{
258 set_ldt(NULL, 0);
259}
260
261/*
262 * load one particular LDT into the current CPU
263 */
264static inline void load_LDT_nolock(mm_context_t *pc)
265{
266 set_ldt(pc->ldt, pc->size);
267}
268
269static inline void load_LDT(mm_context_t *pc)
270{
271 preempt_disable();
272 load_LDT_nolock(pc);
273 preempt_enable();
274}
275
Roland McGrath1bd57182008-01-30 13:31:51 +0100276static inline unsigned long get_desc_base(const struct desc_struct *desc)
Glauber de Oliveira Costacc697852008-01-30 13:31:14 +0100277{
278 return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
279}
Roland McGrath1bd57182008-01-30 13:31:51 +0100280
281static inline unsigned long get_desc_limit(const struct desc_struct *desc)
282{
283 return desc->limit0 | (desc->limit << 16);
284}
285
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100286static inline void _set_gate(int gate, unsigned type, void *addr,
Joe Perchesc1773a12008-03-23 01:01:58 -0700287 unsigned dpl, unsigned ist, unsigned seg)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100288{
289 gate_desc s;
290 pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg);
291 /*
292 * does not need to be atomic because it is only done once at
293 * setup time
294 */
295 write_idt_entry(idt_table, gate, &s);
296}
297
298/*
299 * This needs to use 'idt_table' rather than 'idt', and
300 * thus use the _nonmapped_ version of the IDT, as the
301 * Pentium F0 0F bugfix can have resulted in the mapped
302 * IDT being write-protected.
303 */
304static inline void set_intr_gate(unsigned int n, void *addr)
305{
306 BUG_ON((unsigned)n > 0xFF);
307 _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS);
308}
309
Alan Mayer305b92a2008-04-15 15:36:56 -0500310#define SYS_VECTOR_FREE 0
311#define SYS_VECTOR_ALLOCED 1
312
313extern int first_system_vector;
314extern char system_vectors[];
315
316static inline void alloc_system_vector(int vector)
317{
318 if (system_vectors[vector] == SYS_VECTOR_FREE) {
319 system_vectors[vector] = SYS_VECTOR_ALLOCED;
320 if (first_system_vector > vector)
321 first_system_vector = vector;
322 } else
323 BUG();
324}
325
326static inline void alloc_intr_gate(unsigned int n, void *addr)
327{
328 alloc_system_vector(n);
329 set_intr_gate(n, addr);
330}
331
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100332/*
333 * This routine sets up an interrupt gate at directory privilege level 3.
334 */
335static inline void set_system_intr_gate(unsigned int n, void *addr)
336{
337 BUG_ON((unsigned)n > 0xFF);
338 _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
339}
340
341static inline void set_trap_gate(unsigned int n, void *addr)
342{
343 BUG_ON((unsigned)n > 0xFF);
344 _set_gate(n, GATE_TRAP, addr, 0, 0, __KERNEL_CS);
345}
346
347static inline void set_system_gate(unsigned int n, void *addr)
348{
349 BUG_ON((unsigned)n > 0xFF);
350#ifdef CONFIG_X86_32
351 _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS);
352#else
353 _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
354#endif
355}
356
357static inline void set_task_gate(unsigned int n, unsigned int gdt_entry)
358{
359 BUG_ON((unsigned)n > 0xFF);
360 _set_gate(n, GATE_TASK, (void *)0, 0, 0, (gdt_entry<<3));
361}
362
363static inline void set_intr_gate_ist(int n, void *addr, unsigned ist)
364{
365 BUG_ON((unsigned)n > 0xFF);
366 _set_gate(n, GATE_INTERRUPT, addr, 0, ist, __KERNEL_CS);
367}
368
369static inline void set_system_gate_ist(int n, void *addr, unsigned ist)
370{
371 BUG_ON((unsigned)n > 0xFF);
372 _set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS);
373}
Glauber de Oliveira Costacc697852008-01-30 13:31:14 +0100374
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100375#else
376/*
377 * GET_DESC_BASE reads the descriptor base of the specified segment.
378 *
379 * Args:
380 * idx - descriptor index
381 * gdt - GDT pointer
382 * base - 32bit register to which the base will be written
383 * lo_w - lo word of the "base" register
384 * lo_b - lo byte of the "base" register
385 * hi_b - hi byte of the low word of the "base" register
386 *
387 * Example:
388 * GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah)
389 * Will read the base address of GDT_ENTRY_ESPFIX_SS and put it into %eax.
390 */
391#define GET_DESC_BASE(idx, gdt, base, lo_w, lo_b, hi_b) \
Joe Perchesc1773a12008-03-23 01:01:58 -0700392 movb idx * 8 + 4(gdt), lo_b; \
393 movb idx * 8 + 7(gdt), hi_b; \
394 shll $16, base; \
395 movw idx * 8 + 2(gdt), lo_w;
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100396
397
398#endif /* __ASSEMBLY__ */
399
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +0100400#endif