5 #include <asm/segment.h>
9 #include <linux/preempt.h>
10 #include <linux/smp.h>
11 #include <linux/percpu.h>
15 extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
17 struct Xgt_desc_struct {
19 unsigned long address __attribute__((packed));
21 } __attribute__ ((packed));
23 extern struct Xgt_desc_struct idt_descr;
24 DECLARE_PER_CPU(struct Xgt_desc_struct, cpu_gdt_descr);
27 static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
29 return (struct desc_struct *)per_cpu(cpu_gdt_descr, cpu).address;
32 extern struct desc_struct idt_table[];
33 extern void set_intr_gate(unsigned int irq, void * addr);
35 static inline void pack_descriptor(__u32 *a, __u32 *b,
36 unsigned long base, unsigned long limit, unsigned char type, unsigned char flags)
38 *a = ((base & 0xffff) << 16) | (limit & 0xffff);
39 *b = (base & 0xff000000) | ((base & 0xff0000) >> 16) |
40 (limit & 0x000f0000) | ((type & 0xff) << 8) | ((flags & 0xf) << 20);
43 static inline void pack_gate(__u32 *a, __u32 *b,
44 unsigned long base, unsigned short seg, unsigned char type, unsigned char flags)
46 *a = (seg << 16) | (base & 0xffff);
47 *b = (base & 0xffff0000) | ((type & 0xff) << 8) | (flags & 0xff);
50 #define DESCTYPE_LDT 0x82 /* present, system, DPL-0, LDT */
51 #define DESCTYPE_TSS 0x89 /* present, system, DPL-0, 32-bit TSS */
52 #define DESCTYPE_TASK 0x85 /* present, system, DPL-0, task gate */
53 #define DESCTYPE_INT 0x8e /* present, system, DPL-0, interrupt gate */
54 #define DESCTYPE_TRAP 0x8f /* present, system, DPL-0, trap gate */
55 #define DESCTYPE_DPL3 0x60 /* DPL-3 */
56 #define DESCTYPE_S 0x10 /* !system */
58 #ifdef CONFIG_PARAVIRT
59 #include <asm/paravirt.h>
61 #define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8))
63 #define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr))
64 #define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr))
65 #define load_tr(tr) __asm__ __volatile("ltr %0"::"m" (tr))
66 #define load_ldt(ldt) __asm__ __volatile("lldt %0"::"m" (ldt))
68 #define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr))
69 #define store_idt(dtr) __asm__ ("sidt %0":"=m" (*dtr))
70 #define store_tr(tr) __asm__ ("str %0":"=m" (tr))
71 #define store_ldt(ldt) __asm__ ("sldt %0":"=m" (ldt))
74 # error update this code.
77 static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
79 #define C(i) HYPERVISOR_update_descriptor(virt_to_machine(&get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN + i]), *(u64 *)&t->tls_array[i])
84 extern int write_ldt_entry(void *ldt, int entry, __u32 entry_a, __u32 entry_b);
85 #define write_gdt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b)
86 #define write_idt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b)
88 static inline void write_dt_entry(void *dt, int entry, __u32 entry_a, __u32 entry_b)
90 __u32 *lp = (__u32 *)((char *)dt + entry*8);
95 #define set_ldt native_set_ldt
96 #endif /* CONFIG_PARAVIRT */
98 static inline fastcall void native_set_ldt(const void *addr,
101 if (likely(entries == 0))
102 __asm__ __volatile__("lldt %w0"::"q" (0));
104 unsigned cpu = smp_processor_id();
107 pack_descriptor(&a, &b, (unsigned long)addr,
108 entries * sizeof(struct desc_struct) - 1,
110 write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, a, b);
111 __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
115 static inline void _set_gate(int gate, unsigned int type, void *addr, unsigned short seg)
118 pack_gate(&a, &b, (unsigned long)addr, seg, type, 0);
119 write_idt_entry(idt_table, gate, a, b);
122 #ifndef CONFIG_X86_NO_TSS
123 static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const void *addr)
126 pack_descriptor(&a, &b, (unsigned long)addr,
127 offsetof(struct tss_struct, __cacheline_filler) - 1,
129 write_gdt_entry(get_cpu_gdt_table(cpu), entry, a, b);
132 #define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
135 #define LDT_entry_a(info) \
136 ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
138 #define LDT_entry_b(info) \
139 (((info)->base_addr & 0xff000000) | \
140 (((info)->base_addr & 0x00ff0000) >> 16) | \
141 ((info)->limit & 0xf0000) | \
142 (((info)->read_exec_only ^ 1) << 9) | \
143 ((info)->contents << 10) | \
144 (((info)->seg_not_present ^ 1) << 15) | \
145 ((info)->seg_32bit << 22) | \
146 ((info)->limit_in_pages << 23) | \
147 ((info)->useable << 20) | \
150 #define LDT_empty(info) (\
151 (info)->base_addr == 0 && \
152 (info)->limit == 0 && \
153 (info)->contents == 0 && \
154 (info)->read_exec_only == 1 && \
155 (info)->seg_32bit == 0 && \
156 (info)->limit_in_pages == 0 && \
157 (info)->seg_not_present == 1 && \
158 (info)->useable == 0 )
160 static inline void clear_LDT(void)
165 * NB. We load the default_ldt for lcall7/27 handling on demand, as
166 * it slows down context switching. Noone uses it anyway.
168 cpu = cpu; /* XXX avoid compiler warning */
174 * load one particular LDT into the current CPU
176 static inline void load_LDT_nolock(mm_context_t *pc)
178 xen_set_ldt((unsigned long)pc->ldt, pc->size);
181 static inline void load_LDT(mm_context_t *pc)
188 static inline unsigned long get_desc_base(unsigned long *desc)
191 base = ((desc[0] >> 16) & 0x0000ffff) |
192 ((desc[1] << 16) & 0x00ff0000) |
193 (desc[1] & 0xff000000);
197 static inline void set_user_cs(struct desc_struct *desc, unsigned long limit)
199 limit = (limit - 1) / PAGE_SIZE;
200 desc->a = limit & 0xffff;
201 desc->b = (limit & 0xf0000) | 0x00c0fb00;
204 #define load_user_cs_desc(cpu, mm) \
205 HYPERVISOR_update_descriptor(virt_to_machine(&get_cpu_gdt_table(cpu)[GDT_ENTRY_DEFAULT_USER_CS]), (u64)(mm)->context.user_cs.a | ((u64)(mm)->context.user_cs.b) << 32);
207 extern void arch_add_exec_range(struct mm_struct *mm, unsigned long limit);
208 extern void arch_remove_exec_range(struct mm_struct *mm, unsigned long limit);
209 extern void arch_flush_exec_range(struct mm_struct *mm);
211 #else /* __ASSEMBLY__ */
214 * GET_DESC_BASE reads the descriptor base of the specified segment.
217 * idx - descriptor index
219 * base - 32bit register to which the base will be written
220 * lo_w - lo word of the "base" register
221 * lo_b - lo byte of the "base" register
222 * hi_b - hi byte of the low word of the "base" register
225 * GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah)
226 * Will read the base address of GDT_ENTRY_ESPFIX_SS and put it into %eax.
228 #define GET_DESC_BASE(idx, gdt, base, lo_w, lo_b, hi_b) \
229 movb idx*8+4(gdt), lo_b; \
230 movb idx*8+7(gdt), hi_b; \
232 movw idx*8+2(gdt), lo_w;
234 #endif /* !__ASSEMBLY__ */