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gatieme
2017-03-23 22:52:30 +08:00
parent 70b687b512
commit f5819755a8
2 changed files with 26 additions and 11 deletions
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study/kernel/03-vmarea/00-code/02-gdt_table/Makefile
+1
View File
@@ -22,6 +22,7 @@ DRIVER_LICENSE := "Dual BSD/GPL"
MODULE_NAME := get_gdt_table
MODCFLAGS:=-O6 -Wall -DMODULE -D__KERNEL__ -DLINUX -std=c99
ifneq ($(KERNELRELEASE),)
study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.c
+25 -11
View File
@@ -17,11 +17,14 @@
MODULE_LICENSE("Dual BSD/GPL");
#define BitGet(number, pos) ((number) >> (pos) & 1) /// 用宏得到某数的某位
#define BitSet(number, pos) ((number) |= 1 << (pos)) /// 把某位置1
#define BitClr(number, pos) ((number) &= ~(1 << (pos))) /// 把某位清0
#define BitCpl(number, pos) ((number) ^= 1 << (pos)) /// 把number的POS位取反
#define bit_get(number, pos) ((number) >> (pos) & 1) /// 用宏得到某数的某位
#define bit_set(number, pos) ((number) |= 1 << (pos)) /// 把某位置1
#define bit_clr(number, pos) ((number) &= ~(1 << (pos))) /// 把某位清0
#define bit_cpl(number, pos) ((number) ^= 1 << (pos)) /// 把number的POS位取反
#define get_segment_INDEX(n) ((n) >> 3)
#define get_segment_TI(n) (((n) >> 2) & 0x01)
#define get_segment_RPL(n) ((n) & 0x03)
// http://lxr.free-electrons.com/source/arch/x86/include/asm/segment.h#L123
static void print_segment(void)
@@ -29,7 +32,6 @@ static void print_segment(void)
long data = 0;
/*
---------------------------------------------------------------------------------------------
| | INDEX | TI| RPL |
---------------------------------------------------------------------------------------------
@@ -50,17 +52,28 @@ static void print_segment(void)
__USER_DS = 0x002B = | 00101011 00000000 |
*/
data = __KERNEL_CS;
printk("__KERNEL_CS = %0x\n", data);
printk("__KERNEL_CS = %0x, index = %d, TI = %d, RPL = %d\n", data,
get_segment_INDEX(data),
get_segment_TI(data),
get_segment_RPL(data));
data = __KERNEL_DS;
printk("__KERNEL_DS = %0x\n", data);
printk("__KERNEL_DS = %0x, index = %d, TI = %d, RPL = %d\n", data,
get_segment_INDEX(data),
get_segment_TI(data),
get_segment_RPL(data));
data = __USER_CS;
printk("__USER_CS = %0x\n", data);
printk("__USER_CS = %0x, index = %d, TI = %d, RPL = %d\n", data,
get_segment_INDEX(data),
get_segment_TI(data),
get_segment_RPL(data));
data = __USER_DS;
printk("__USER_DS = %0x\n", data);
printk("__USER_DS = %0x, index = %d, TI = %d, RPL = %d\n", data,
get_segment_INDEX(data),
get_segment_TI(data),
get_segment_RPL(data));
}
@@ -106,10 +119,11 @@ static void print_cpu_gdt_table(struct desc_struct *desc, int size)
static int hello_init(void)
{
printk("GDT_ENTRIES = %d\n", GDT_ENTRIES);
struct desc_struct *gdt_table = get_cpu_gdt_table(0);
struct desc_struct *gdt_table = get_cpu_gdt_table(1);
print_cpu_gdt_table(gdt_table, GDT_ENTRIES);
print_segment();
return 0;
}