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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 de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010032#ifdef CONFIG_X86_64
33extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
34extern struct desc_ptr cpu_gdt_descr[];
35/* the cpu gdt accessor */
36#define get_cpu_gdt_table(x) ((struct desc_struct *)cpu_gdt_descr[x].address)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010037
38static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
39 unsigned dpl, unsigned ist, unsigned seg)
40{
41 gate->offset_low = PTR_LOW(func);
42 gate->segment = __KERNEL_CS;
43 gate->ist = ist;
44 gate->p = 1;
45 gate->dpl = dpl;
46 gate->zero0 = 0;
47 gate->zero1 = 0;
48 gate->type = type;
49 gate->offset_middle = PTR_MIDDLE(func);
50 gate->offset_high = PTR_HIGH(func);
51}
52
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010053#else
54struct gdt_page {
55 struct desc_struct gdt[GDT_ENTRIES];
56} __attribute__((aligned(PAGE_SIZE)));
57DECLARE_PER_CPU(struct gdt_page, gdt_page);
58
59static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
60{
61 return per_cpu(gdt_page, cpu).gdt;
62}
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010063
64static inline void pack_gate(gate_desc *gate, unsigned char type,
Joe Perchesc1773a12008-03-23 01:01:58 -070065 unsigned long base, unsigned dpl, unsigned flags,
66 unsigned short seg)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010067{
68 gate->a = (seg << 16) | (base & 0xffff);
69 gate->b = (base & 0xffff0000) |
70 (((0x80 | type | (dpl << 5)) & 0xff) << 8);
71}
72
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010073#endif
74
Glauber de Oliveira Costa746ff602008-01-30 13:31:27 +010075static inline int desc_empty(const void *ptr)
76{
77 const u32 *desc = ptr;
78 return !(desc[0] | desc[1]);
79}
80
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010081#ifdef CONFIG_PARAVIRT
82#include <asm/paravirt.h>
83#else
84#define load_TR_desc() native_load_tr_desc()
85#define load_gdt(dtr) native_load_gdt(dtr)
86#define load_idt(dtr) native_load_idt(dtr)
Joe Perchesc1773a12008-03-23 01:01:58 -070087#define load_tr(tr) asm volatile("ltr %0"::"m" (tr))
88#define load_ldt(ldt) asm volatile("lldt %0"::"m" (ldt))
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010089
90#define store_gdt(dtr) native_store_gdt(dtr)
91#define store_idt(dtr) native_store_idt(dtr)
92#define store_tr(tr) (tr = native_store_tr())
Joe Perchesc1773a12008-03-23 01:01:58 -070093#define store_ldt(ldt) asm("sldt %0":"=m" (ldt))
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010094
95#define load_TLS(t, cpu) native_load_tls(t, cpu)
96#define set_ldt native_set_ldt
97
Joe Perchesc1773a12008-03-23 01:01:58 -070098#define write_ldt_entry(dt, entry, desc) \
99 native_write_ldt_entry(dt, entry, desc)
100#define write_gdt_entry(dt, entry, desc, type) \
101 native_write_gdt_entry(dt, entry, desc, type)
102#define write_idt_entry(dt, entry, g) \
103 native_write_idt_entry(dt, entry, g)
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100104#endif
105
106static inline void native_write_idt_entry(gate_desc *idt, int entry,
107 const gate_desc *gate)
108{
109 memcpy(&idt[entry], gate, sizeof(*gate));
110}
111
112static inline void native_write_ldt_entry(struct desc_struct *ldt, int entry,
113 const void *desc)
114{
115 memcpy(&ldt[entry], desc, 8);
116}
117
118static inline void native_write_gdt_entry(struct desc_struct *gdt, int entry,
119 const void *desc, int type)
120{
121 unsigned int size;
122 switch (type) {
123 case DESC_TSS:
124 size = sizeof(tss_desc);
125 break;
126 case DESC_LDT:
127 size = sizeof(ldt_desc);
128 break;
129 default:
130 size = sizeof(struct desc_struct);
131 break;
132 }
133 memcpy(&gdt[entry], desc, size);
134}
135
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100136static inline void pack_descriptor(struct desc_struct *desc, unsigned long base,
137 unsigned long limit, unsigned char type,
138 unsigned char flags)
139{
140 desc->a = ((base & 0xffff) << 16) | (limit & 0xffff);
141 desc->b = (base & 0xff000000) | ((base & 0xff0000) >> 16) |
Joe Perchesc1773a12008-03-23 01:01:58 -0700142 (limit & 0x000f0000) | ((type & 0xff) << 8) |
143 ((flags & 0xf) << 20);
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100144 desc->p = 1;
145}
146
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100147
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100148static inline void set_tssldt_descriptor(void *d, unsigned long addr,
149 unsigned type, unsigned size)
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100150{
151#ifdef CONFIG_X86_64
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100152 struct ldttss_desc64 *desc = d;
153 memset(desc, 0, sizeof(*desc));
154 desc->limit0 = size & 0xFFFF;
155 desc->base0 = PTR_LOW(addr);
156 desc->base1 = PTR_MIDDLE(addr) & 0xFF;
157 desc->type = type;
158 desc->p = 1;
159 desc->limit1 = (size >> 16) & 0xF;
160 desc->base2 = (PTR_MIDDLE(addr) >> 8) & 0xFF;
161 desc->base3 = PTR_HIGH(addr);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100162#else
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100163 pack_descriptor((struct desc_struct *)d, addr, size, 0x80 | type, 0);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100164#endif
165}
166
167static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr)
168{
169 struct desc_struct *d = get_cpu_gdt_table(cpu);
170 tss_desc tss;
171
172 /*
173 * sizeof(unsigned long) coming from an extra "long" at the end
174 * of the iobitmap. See tss_struct definition in processor.h
175 *
176 * -1? seg base+limit should be pointing to the address of the
177 * last valid byte
178 */
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100179 set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS,
Joe Perchesc1773a12008-03-23 01:01:58 -0700180 IO_BITMAP_OFFSET + IO_BITMAP_BYTES +
181 sizeof(unsigned long) - 1);
Glauber de Oliveira Costac81c6ca2008-01-30 13:31:14 +0100182 write_gdt_entry(d, entry, &tss, DESC_TSS);
183}
184
185#define set_tss_desc(cpu, addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
186
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100187static inline void native_set_ldt(const void *addr, unsigned int entries)
188{
189 if (likely(entries == 0))
Joe Perchesc1773a12008-03-23 01:01:58 -0700190 asm volatile("lldt %w0"::"q" (0));
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100191 else {
192 unsigned cpu = smp_processor_id();
193 ldt_desc ldt;
194
Glauber de Oliveira Costaf6e0eba2008-01-30 13:31:20 +0100195 set_tssldt_descriptor(&ldt, (unsigned long)addr,
196 DESC_LDT, entries * sizeof(ldt) - 1);
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100197 write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT,
198 &ldt, DESC_LDT);
Joe Perchesc1773a12008-03-23 01:01:58 -0700199 asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +0100200 }
201}
202
203static inline void native_load_tr_desc(void)
204{
205 asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
206}
207
208static inline void native_load_gdt(const struct desc_ptr *dtr)
209{
210 asm volatile("lgdt %0"::"m" (*dtr));
211}
212
213static inline void native_load_idt(const struct desc_ptr *dtr)
214{
215 asm volatile("lidt %0"::"m" (*dtr));
216}
217
218static inline void native_store_gdt(struct desc_ptr *dtr)
219{
220 asm volatile("sgdt %0":"=m" (*dtr));
221}
222
223static inline void native_store_idt(struct desc_ptr *dtr)
224{
225 asm volatile("sidt %0":"=m" (*dtr));
226}
227
228static inline unsigned long native_store_tr(void)
229{
230 unsigned long tr;
231 asm volatile("str %0":"=r" (tr));
232 return tr;
233}
234
235static inline void native_load_tls(struct thread_struct *t, unsigned int cpu)
236{
237 unsigned int i;
238 struct desc_struct *gdt = get_cpu_gdt_table(cpu);
239
240 for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
241 gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i];
242}
243
Joe Perchesc1773a12008-03-23 01:01:58 -0700244#define _LDT_empty(info) \
245 ((info)->base_addr == 0 && \
246 (info)->limit == 0 && \
247 (info)->contents == 0 && \
248 (info)->read_exec_only == 1 && \
249 (info)->seg_32bit == 0 && \
250 (info)->limit_in_pages == 0 && \
251 (info)->seg_not_present == 1 && \
252 (info)->useable == 0)
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100253
254#ifdef CONFIG_X86_64
255#define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0))
256#else
257#define LDT_empty(info) (_LDT_empty(info))
258#endif
259
260static inline void clear_LDT(void)
261{
262 set_ldt(NULL, 0);
263}
264
265/*
266 * load one particular LDT into the current CPU
267 */
268static inline void load_LDT_nolock(mm_context_t *pc)
269{
270 set_ldt(pc->ldt, pc->size);
271}
272
273static inline void load_LDT(mm_context_t *pc)
274{
275 preempt_disable();
276 load_LDT_nolock(pc);
277 preempt_enable();
278}
279
Roland McGrath1bd57182008-01-30 13:31:51 +0100280static inline unsigned long get_desc_base(const struct desc_struct *desc)
Glauber de Oliveira Costacc697852008-01-30 13:31:14 +0100281{
282 return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
283}
Roland McGrath1bd57182008-01-30 13:31:51 +0100284
285static inline unsigned long get_desc_limit(const struct desc_struct *desc)
286{
287 return desc->limit0 | (desc->limit << 16);
288}
289
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100290static inline void _set_gate(int gate, unsigned type, void *addr,
Joe Perchesc1773a12008-03-23 01:01:58 -0700291 unsigned dpl, unsigned ist, unsigned seg)
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +0100292{
293 gate_desc s;
294 pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg);
295 /*
296 * does not need to be atomic because it is only done once at
297 * setup time
298 */
299 write_idt_entry(idt_table, gate, &s);
300}
301
302/*
303 * This needs to use 'idt_table' rather than 'idt', and
304 * thus use the _nonmapped_ version of the IDT, as the
305 * Pentium F0 0F bugfix can have resulted in the mapped
306 * IDT being write-protected.
307 */
308static inline void set_intr_gate(unsigned int n, void *addr)
309{
310 BUG_ON((unsigned)n > 0xFF);
311 _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS);
312}
313
314/*
315 * This routine sets up an interrupt gate at directory privilege level 3.
316 */
317static inline void set_system_intr_gate(unsigned int n, void *addr)
318{
319 BUG_ON((unsigned)n > 0xFF);
320 _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
321}
322
323static inline void set_trap_gate(unsigned int n, void *addr)
324{
325 BUG_ON((unsigned)n > 0xFF);
326 _set_gate(n, GATE_TRAP, addr, 0, 0, __KERNEL_CS);
327}
328
329static inline void set_system_gate(unsigned int n, void *addr)
330{
331 BUG_ON((unsigned)n > 0xFF);
332#ifdef CONFIG_X86_32
333 _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS);
334#else
335 _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
336#endif
337}
338
339static inline void set_task_gate(unsigned int n, unsigned int gdt_entry)
340{
341 BUG_ON((unsigned)n > 0xFF);
342 _set_gate(n, GATE_TASK, (void *)0, 0, 0, (gdt_entry<<3));
343}
344
345static inline void set_intr_gate_ist(int n, void *addr, unsigned ist)
346{
347 BUG_ON((unsigned)n > 0xFF);
348 _set_gate(n, GATE_INTERRUPT, addr, 0, ist, __KERNEL_CS);
349}
350
351static inline void set_system_gate_ist(int n, void *addr, unsigned ist)
352{
353 BUG_ON((unsigned)n > 0xFF);
354 _set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS);
355}
Glauber de Oliveira Costacc697852008-01-30 13:31:14 +0100356
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100357#else
358/*
359 * GET_DESC_BASE reads the descriptor base of the specified segment.
360 *
361 * Args:
362 * idx - descriptor index
363 * gdt - GDT pointer
364 * base - 32bit register to which the base will be written
365 * lo_w - lo word of the "base" register
366 * lo_b - lo byte of the "base" register
367 * hi_b - hi byte of the low word of the "base" register
368 *
369 * Example:
370 * GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah)
371 * Will read the base address of GDT_ENTRY_ESPFIX_SS and put it into %eax.
372 */
373#define GET_DESC_BASE(idx, gdt, base, lo_w, lo_b, hi_b) \
Joe Perchesc1773a12008-03-23 01:01:58 -0700374 movb idx * 8 + 4(gdt), lo_b; \
375 movb idx * 8 + 7(gdt), hi_b; \
376 shll $16, base; \
377 movw idx * 8 + 2(gdt), lo_w;
Glauber de Oliveira Costa881c2972008-01-30 13:31:14 +0100378
379
380#endif /* __ASSEMBLY__ */
381
Glauber de Oliveira Costa80fbb692008-01-30 13:31:13 +0100382#endif