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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __ARCH_DESC_H |
| 2 | #define __ARCH_DESC_H |
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| 3 | |||
| 4 | #include <asm/ldt.h> |
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| 5 | #include <asm/segment.h> |
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| 6 | |||
| 7 | #ifndef __ASSEMBLY__ |
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| 8 | |||
| 9 | #include <linux/preempt.h> |
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| 10 | #include <linux/smp.h> |
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| 11 | |||
| 12 | #include <asm/mmu.h> |
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| 13 | |||
| 14 | extern struct desc_struct cpu_gdt_table[NR_CPUS][GDT_ENTRIES]; |
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| 15 | |||
| 16 | struct Xgt_desc_struct { |
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| 17 | unsigned short size; |
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| 18 | unsigned long address __attribute__((packed)); |
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| 19 | unsigned short pad; |
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| 20 | } __attribute__ ((packed)); |
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| 21 | |||
| 22 | extern struct Xgt_desc_struct idt_descr, cpu_gdt_descr[NR_CPUS]; |
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| 23 | |||
| 24 | #define load_TR_desc() __asm__ __volatile__("ltr %%ax"::"a" (GDT_ENTRY_TSS*8)) |
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| 25 | #define load_LDT_desc() __asm__ __volatile__("lldt %%ax"::"a" (GDT_ENTRY_LDT*8)) |
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| 26 | |||
| 27 | /* |
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| 28 | * This is the ldt that every process will get unless we need |
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| 29 | * something other than this. |
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| 30 | */ |
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| 31 | extern struct desc_struct default_ldt[]; |
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| 32 | extern void set_intr_gate(unsigned int irq, void * addr); |
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| 33 | |||
| 34 | #define _set_tssldt_desc(n,addr,limit,type) \ |
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| 35 | __asm__ __volatile__ ("movw %w3,0(%2)\n\t" \ |
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| 36 | "movw %%ax,2(%2)\n\t" \ |
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| 37 | "rorl $16,%%eax\n\t" \ |
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| 38 | "movb %%al,4(%2)\n\t" \ |
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| 39 | "movb %4,5(%2)\n\t" \ |
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| 40 | "movb $0,6(%2)\n\t" \ |
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| 41 | "movb %%ah,7(%2)\n\t" \ |
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| 42 | "rorl $16,%%eax" \ |
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| 43 | : "=m"(*(n)) : "a" (addr), "r"(n), "ir"(limit), "i"(type)) |
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| 44 | |||
| 45 | static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void *addr) |
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| 46 | { |
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| 47 | _set_tssldt_desc(&cpu_gdt_table[cpu][entry], (int)addr, 235, 0x89); |
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| 48 | } |
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| 49 | |||
| 50 | #define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr) |
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| 51 | |||
| 52 | static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int size) |
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| 53 | { |
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| 54 | _set_tssldt_desc(&cpu_gdt_table[cpu][GDT_ENTRY_LDT], (int)addr, ((size << 3)-1), 0x82); |
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| 55 | } |
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| 56 | |||
| 57 | #define LDT_entry_a(info) \ |
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| 58 | ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) |
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| 59 | |||
| 60 | #define LDT_entry_b(info) \ |
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| 61 | (((info)->base_addr & 0xff000000) | \ |
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| 62 | (((info)->base_addr & 0x00ff0000) >> 16) | \ |
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| 63 | ((info)->limit & 0xf0000) | \ |
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| 64 | (((info)->read_exec_only ^ 1) << 9) | \ |
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| 65 | ((info)->contents << 10) | \ |
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| 66 | (((info)->seg_not_present ^ 1) << 15) | \ |
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| 67 | ((info)->seg_32bit << 22) | \ |
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| 68 | ((info)->limit_in_pages << 23) | \ |
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| 69 | ((info)->useable << 20) | \ |
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| 70 | 0x7000) |
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| 71 | |||
| 72 | #define LDT_empty(info) (\ |
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| 73 | (info)->base_addr == 0 && \ |
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| 74 | (info)->limit == 0 && \ |
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| 75 | (info)->contents == 0 && \ |
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| 76 | (info)->read_exec_only == 1 && \ |
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| 77 | (info)->seg_32bit == 0 && \ |
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| 78 | (info)->limit_in_pages == 0 && \ |
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| 79 | (info)->seg_not_present == 1 && \ |
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| 80 | (info)->useable == 0 ) |
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| 81 | |||
| 82 | #if TLS_SIZE != 24 |
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| 83 | # error update this code. |
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| 84 | #endif |
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| 85 | |||
| 86 | static inline void load_TLS(struct thread_struct *t, unsigned int cpu) |
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| 87 | { |
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| 88 | #define C(i) cpu_gdt_table[cpu][GDT_ENTRY_TLS_MIN + i] = t->tls_array[i] |
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| 89 | C(0); C(1); C(2); |
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| 90 | #undef C |
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| 91 | } |
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| 92 | |||
| 93 | static inline void clear_LDT(void) |
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| 94 | { |
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| 95 | int cpu = get_cpu(); |
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| 96 | |||
| 97 | set_ldt_desc(cpu, &default_ldt[0], 5); |
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| 98 | load_LDT_desc(); |
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| 99 | put_cpu(); |
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| 100 | } |
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| 101 | |||
| 102 | /* |
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| 103 | * load one particular LDT into the current CPU |
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| 104 | */ |
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| 105 | static inline void load_LDT_nolock(mm_context_t *pc, int cpu) |
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| 106 | { |
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| 107 | void *segments = pc->ldt; |
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| 108 | int count = pc->size; |
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| 109 | |||
| 110 | if (likely(!count)) { |
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| 111 | segments = &default_ldt[0]; |
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| 112 | count = 5; |
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| 113 | } |
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| 114 | |||
| 115 | set_ldt_desc(cpu, segments, count); |
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| 116 | load_LDT_desc(); |
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| 117 | } |
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| 118 | |||
| 119 | static inline void load_LDT(mm_context_t *pc) |
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| 120 | { |
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| 121 | int cpu = get_cpu(); |
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| 122 | load_LDT_nolock(pc, cpu); |
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| 123 | put_cpu(); |
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| 124 | } |
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| 125 | |||
| 126 | #endif /* !__ASSEMBLY__ */ |
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| 127 | |||
| 128 | #endif |