This source file includes following definitions.
- tas
1 #ifndef __ASM_SYSTEM_H
2 #define __ASM_SYSTEM_H
3
4 #include <asm/segment.h>
5
6 #define move_to_user_mode() \
7 __asm__ __volatile__ ("movl %%esp,%%eax\n\t" \
8 "pushl %0\n\t" \
9 "pushl %%eax\n\t" \
10 "pushfl\n\t" \
11 "pushl %1\n\t" \
12 "pushl $1f\n\t" \
13 "iret\n" \
14 "1:\tmovl %0,%%eax\n\t" \
15 "mov %%ax,%%ds\n\t" \
16 "mov %%ax,%%es\n\t" \
17 "mov %%ax,%%fs\n\t" \
18 "mov %%ax,%%gs" \
19 : :"i" (USER_DS), "i" (USER_CS):"ax")
20
21 #define nop() __asm__ __volatile__ ("nop")
22
23
24
25
26 #define clts() __asm__ __volatile__ ("clts")
27 #define stts() \
28 __asm__ __volatile__ ( \
29 "movl %%cr0,%%eax\n\t" \
30 "orl $8,%%eax\n\t" \
31 "movl %%eax,%%cr0" \
32 : \
33 : \
34 :"ax")
35
36
37 extern inline int tas(char * m)
38 {
39 char res;
40
41 __asm__("xchgb %0,%1":"=q" (res),"=m" (*m):"0" (0x1));
42 return res;
43 }
44
45 #define sti() __asm__ __volatile__ ("sti": : :"memory")
46 #define cli() __asm__ __volatile__ ("cli": : :"memory")
47
48 #define save_flags(x) \
49 __asm__ __volatile__("pushfl ; popl %0":"=r" (x): :"memory")
50
51 #define restore_flags(x) \
52 __asm__ __volatile__("pushl %0 ; popfl": :"r" (x):"memory")
53
54 #define iret() __asm__ __volatile__ ("iret": : :"memory")
55
56 #define _set_gate(gate_addr,type,dpl,addr) \
57 __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
58 "movw %2,%%dx\n\t" \
59 "movl %%eax,%0\n\t" \
60 "movl %%edx,%1" \
61 :"=m" (*((long *) (gate_addr))), \
62 "=m" (*(1+(long *) (gate_addr))) \
63 :"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
64 "d" ((char *) (addr)),"a" (KERNEL_CS << 16) \
65 :"ax","dx")
66
67 #define set_intr_gate(n,addr) \
68 _set_gate(&idt[n],14,0,addr)
69
70 #define set_trap_gate(n,addr) \
71 _set_gate(&idt[n],15,0,addr)
72
73 #define set_system_gate(n,addr) \
74 _set_gate(&idt[n],15,3,addr)
75
76 #define set_call_gate(a,addr) \
77 _set_gate(a,12,3,addr)
78
79 #define _set_seg_desc(gate_addr,type,dpl,base,limit) {\
80 *((gate_addr)+1) = ((base) & 0xff000000) | \
81 (((base) & 0x00ff0000)>>16) | \
82 ((limit) & 0xf0000) | \
83 ((dpl)<<13) | \
84 (0x00408000) | \
85 ((type)<<8); \
86 *(gate_addr) = (((base) & 0x0000ffff)<<16) | \
87 ((limit) & 0x0ffff); }
88
89 #define _set_tssldt_desc(n,addr,limit,type) \
90 __asm__ __volatile__ ("movw $" #limit ",%1\n\t" \
91 "movw %%ax,%2\n\t" \
92 "rorl $16,%%eax\n\t" \
93 "movb %%al,%3\n\t" \
94 "movb $" type ",%4\n\t" \
95 "movb $0x00,%5\n\t" \
96 "movb %%ah,%6\n\t" \
97 "rorl $16,%%eax" \
98 : \
99 :"a" (addr+0xc0000000), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \
100 "m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \
101 )
102
103 #define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),235,"0x89")
104 #define set_ldt_desc(n,addr,size) \
105 _set_tssldt_desc(((char *) (n)),((int)(addr)),((size << 3) - 1),"0x82")
106
107
108 #endif