Mirrors_BOOKS/LDD-LinuxDeviceDrivers
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获取gdt的信息...

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This commit is contained in:
gatieme
2017-03-25 11:04:46 +08:00
parent b58ad7e1b7
commit 3c9fe2a277
1 changed files with 17 additions and 8 deletions
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study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.c
+17 -8
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@@ -87,16 +87,16 @@ static void print_desc_struct(struct desc_struct *desc)
#define get_desc_struct_BASE1(gdt) (((gdt) >> 32) & 0xff)
#define get_desc_struct_BASE2(gdt) (((gdt) >> 56) & 0xff)
#define get_desc_struct_BASE(gdt) \
((get_desc_struct_BASE0(gdt) << 16) \
| (get_desc_struct_BASE1(gdt) << 8) \
| (get_desc_struct_BASE2(gdt)))
((get_desc_struct_BASE2(gdt) << 24) \
| (get_desc_struct_BASE1(gdt) << 16) \
| (get_desc_struct_BASE0(gdt)))
#define get_desc_struct_LIMIT0(gdt) ((gdt) & 0xffff)
#define get_desc_struct_LIMIT1(gdt) (((gdt) >> 48) & 0x0f)
#define get_desc_struct_LIMIT(gdt) \
((get_desc_struct_LIMIT0(gdt) << 4) \
| (get_desc_struct_LIMIT1(gdt)))
((get_desc_struct_LIMIT1(gdt) << 16) \
| (get_desc_struct_LIMIT0(gdt)))
#define get_desc_struct_G(gdt) (((gdt) >> 55) & 0x01) /* 55 */
#define get_desc_struct_D_or_B(gdt) (((gdt) >> 54) & 0x01) /* 54 */
@@ -114,10 +114,17 @@ static void print_desc_struct(struct desc_struct *desc)
printk("0x%08x, 0x%08x | 0x%x | %d | %d |\n",
desc->b, desc->a, desc->type, desc->dpl, desc->s);
unsigned long data = *((unsigned long *)desc);
printk("base = 0x%0x, limit = 0x%0x, P = %d, DPL = %d, type = %d%d%d%d\n",
printk("base = 0x%0x, limit = 0x%0x\n"
"G = %d, D/B = %d, O = %d, AV = %d\n"
"P = %d, DPL = %d, S = %d, type = %d%d%d%d\n",
get_desc_struct_BASE(data), get_desc_struct_LIMIT(data),
get_desc_struct_G(data), get_desc_struct_D_or_B(data),
get_desc_struct_O(data), get_desc_struct_AV(data),
get_desc_struct_P(data), get_desc_struct_DPL(data),
get_desc_struct_S(data), get_desc_struct_ED_or_C(data),
get_desc_struct_S(data),
get_desc_struct_E(data), get_desc_struct_ED_or_C(data),
get_desc_struct_R_or_W(data), get_desc_struct_A(data));
}
@@ -132,8 +139,10 @@ static void print_cpu_gdt_table(unsigned int cpu)
int i = 0;
struct desc_struct *gdt_table = get_cpu_gdt_table(cpu);
printk("GDT_ENTRIES = %d\n", GDT_ENTRIES);
printk("GDT_ENTRY_TLS_MIN = %d\n", GDT_ENTRY_TLS_MIN);
printk("GDT_ENTRY_TLS_ENTRIES = %d\n", GDT_ENTRY_TLS_ENTRIES);
printk("-----------------------------------\n");
printk("|\t\t\t\t| type | dpl | s |\n");
for(i = 0; i < GDT_ENTRIES; i++)