fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-x86 / desc_64.h
blobac991b5ca0fd501c0b294963031ca505016dbb9e
1 /* Written 2000 by Andi Kleen */
2 #ifndef __ARCH_DESC_H
3 #define __ARCH_DESC_H
5 #include <linux/threads.h>
6 #include <asm/ldt.h>
8 #ifndef __ASSEMBLY__
10 #include <linux/string.h>
11 #include <linux/smp.h>
12 #include <asm/desc_defs.h>
14 #include <asm/segment.h>
15 #include <asm/mmu.h>
17 extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
19 #define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8))
20 #define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))
21 #define clear_LDT() asm volatile("lldt %w0"::"r" (0))
24 * This is the ldt that every process will get unless we need
25 * something other than this.
27 extern struct desc_struct default_ldt[];
28 extern struct gate_struct idt_table[];
29 extern struct desc_ptr cpu_gdt_descr[];
31 /* the cpu gdt accessor */
32 #define cpu_gdt(_cpu) ((struct desc_struct *)cpu_gdt_descr[_cpu].address)
34 static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist)
36 struct gate_struct s;
37 s.offset_low = PTR_LOW(func);
38 s.segment = __KERNEL_CS;
39 s.ist = ist;
40 s.p = 1;
41 s.dpl = dpl;
42 s.zero0 = 0;
43 s.zero1 = 0;
44 s.type = type;
45 s.offset_middle = PTR_MIDDLE(func);
46 s.offset_high = PTR_HIGH(func);
47 /* does not need to be atomic because it is only done once at setup time */
48 memcpy(adr, &s, 16);
51 static inline void set_intr_gate(int nr, void *func)
53 BUG_ON((unsigned)nr > 0xFF);
54 _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 0);
57 static inline void set_intr_gate_ist(int nr, void *func, unsigned ist)
59 BUG_ON((unsigned)nr > 0xFF);
60 _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, ist);
63 static inline void set_system_gate(int nr, void *func)
65 BUG_ON((unsigned)nr > 0xFF);
66 _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0);
69 static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
71 _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist);
74 static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type,
75 unsigned size)
77 struct ldttss_desc d;
78 memset(&d,0,sizeof(d));
79 d.limit0 = size & 0xFFFF;
80 d.base0 = PTR_LOW(tss);
81 d.base1 = PTR_MIDDLE(tss) & 0xFF;
82 d.type = type;
83 d.p = 1;
84 d.limit1 = (size >> 16) & 0xF;
85 d.base2 = (PTR_MIDDLE(tss) >> 8) & 0xFF;
86 d.base3 = PTR_HIGH(tss);
87 memcpy(ptr, &d, 16);
90 static inline void set_tss_desc(unsigned cpu, void *addr)
93 * sizeof(unsigned long) coming from an extra "long" at the end
94 * of the iobitmap. See tss_struct definition in processor.h
96 * -1? seg base+limit should be pointing to the address of the
97 * last valid byte
99 set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_TSS],
100 (unsigned long)addr, DESC_TSS,
101 IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1);
104 static inline void set_ldt_desc(unsigned cpu, void *addr, int size)
106 set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_LDT], (unsigned long)addr,
107 DESC_LDT, size * 8 - 1);
110 #define LDT_entry_a(info) \
111 ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
112 /* Don't allow setting of the lm bit. It is useless anyways because
113 64bit system calls require __USER_CS. */
114 #define LDT_entry_b(info) \
115 (((info)->base_addr & 0xff000000) | \
116 (((info)->base_addr & 0x00ff0000) >> 16) | \
117 ((info)->limit & 0xf0000) | \
118 (((info)->read_exec_only ^ 1) << 9) | \
119 ((info)->contents << 10) | \
120 (((info)->seg_not_present ^ 1) << 15) | \
121 ((info)->seg_32bit << 22) | \
122 ((info)->limit_in_pages << 23) | \
123 ((info)->useable << 20) | \
124 /* ((info)->lm << 21) | */ \
125 0x7000)
127 #define LDT_empty(info) (\
128 (info)->base_addr == 0 && \
129 (info)->limit == 0 && \
130 (info)->contents == 0 && \
131 (info)->read_exec_only == 1 && \
132 (info)->seg_32bit == 0 && \
133 (info)->limit_in_pages == 0 && \
134 (info)->seg_not_present == 1 && \
135 (info)->useable == 0 && \
136 (info)->lm == 0)
138 static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
140 unsigned int i;
141 u64 *gdt = (u64 *)(cpu_gdt(cpu) + GDT_ENTRY_TLS_MIN);
143 for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
144 gdt[i] = t->tls_array[i];
148 * load one particular LDT into the current CPU
150 static inline void load_LDT_nolock (mm_context_t *pc, int cpu)
152 int count = pc->size;
154 if (likely(!count)) {
155 clear_LDT();
156 return;
159 set_ldt_desc(cpu, pc->ldt, count);
160 load_LDT_desc();
163 static inline void load_LDT(mm_context_t *pc)
165 int cpu = get_cpu();
166 load_LDT_nolock(pc, cpu);
167 put_cpu();
170 extern struct desc_ptr idt_descr;
172 #endif /* !__ASSEMBLY__ */
174 #endif