107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
#ifndef __ASM_SYSTEM_H
|
|
#define __ASM_SYSTEM_H
|
|
|
|
#include <linux/segment.h>
|
|
|
|
#define move_to_user_mode() \
|
|
__asm__ __volatile__ ("movl %%esp,%%eax\n\t" \
|
|
"pushl %0\n\t" \
|
|
"pushl %%eax\n\t" \
|
|
"pushfl\n\t" \
|
|
"pushl %1\n\t" \
|
|
"pushl $1f\n\t" \
|
|
"iret\n" \
|
|
"1:\tmovl %0,%%eax\n\t" \
|
|
"mov %%ax,%%ds\n\t" \
|
|
"mov %%ax,%%es\n\t" \
|
|
"mov %%ax,%%fs\n\t" \
|
|
"mov %%ax,%%gs" \
|
|
: /* no outputs */ :"i" (USER_DS), "i" (USER_CS):"ax")
|
|
|
|
#define sti() __asm__ __volatile__ ("sti": : :"memory")
|
|
#define cli() __asm__ __volatile__ ("cli": : :"memory")
|
|
#define nop() __asm__ __volatile__ ("nop")
|
|
|
|
/*
|
|
* Clear and set 'TS' bit respectively
|
|
*/
|
|
#define clts() __asm__ __volatile__ ("clts")
|
|
#define stts() \
|
|
__asm__ __volatile__ ( \
|
|
"movl %%cr0,%%eax\n\t" \
|
|
"orl $8,%%eax\n\t" \
|
|
"movl %%eax,%%cr0" \
|
|
: /* no outputs */ \
|
|
: /* no inputs */ \
|
|
:"ax")
|
|
|
|
|
|
extern inline int tas(char * m)
|
|
{
|
|
char res;
|
|
|
|
__asm__("xchgb %0,%1":"=q" (res),"=m" (*m):"0" (0x1));
|
|
return res;
|
|
}
|
|
|
|
#define save_flags(x) \
|
|
__asm__ __volatile__("pushfl ; popl %0":"=r" (x): /* no input */ :"memory")
|
|
|
|
#define restore_flags(x) \
|
|
__asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"r" (x):"memory")
|
|
|
|
#define iret() __asm__ __volatile__ ("iret": : :"memory")
|
|
|
|
#define _set_gate(gate_addr,type,dpl,addr) \
|
|
__asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
|
|
"movw %2,%%dx\n\t" \
|
|
"movl %%eax,%0\n\t" \
|
|
"movl %%edx,%1" \
|
|
:"=m" (*((long *) (gate_addr))), \
|
|
"=m" (*(1+(long *) (gate_addr))) \
|
|
:"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
|
|
"d" ((char *) (addr)),"a" (KERNEL_CS << 16) \
|
|
:"ax","dx")
|
|
|
|
#define set_intr_gate(n,addr) \
|
|
_set_gate(&idt[n],14,0,addr)
|
|
|
|
#define set_trap_gate(n,addr) \
|
|
_set_gate(&idt[n],15,0,addr)
|
|
|
|
#define set_system_gate(n,addr) \
|
|
_set_gate(&idt[n],15,3,addr)
|
|
|
|
#define set_call_gate(a,addr) \
|
|
_set_gate(a,12,3,addr)
|
|
|
|
#define _set_seg_desc(gate_addr,type,dpl,base,limit) {\
|
|
*((gate_addr)+1) = ((base) & 0xff000000) | \
|
|
(((base) & 0x00ff0000)>>16) | \
|
|
((limit) & 0xf0000) | \
|
|
((dpl)<<13) | \
|
|
(0x00408000) | \
|
|
((type)<<8); \
|
|
*(gate_addr) = (((base) & 0x0000ffff)<<16) | \
|
|
((limit) & 0x0ffff); }
|
|
|
|
#define _set_tssldt_desc(n,addr,limit,type) \
|
|
__asm__ __volatile__ ("movw $" #limit ",%1\n\t" \
|
|
"movw %%ax,%2\n\t" \
|
|
"rorl $16,%%eax\n\t" \
|
|
"movb %%al,%3\n\t" \
|
|
"movb $" type ",%4\n\t" \
|
|
"movb $0x00,%5\n\t" \
|
|
"movb %%ah,%6\n\t" \
|
|
"rorl $16,%%eax" \
|
|
: /* no output */ \
|
|
:"a" (addr+0xc0000000), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \
|
|
"m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \
|
|
)
|
|
|
|
#define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),235,"0x89")
|
|
#define set_ldt_desc(n,addr,size) \
|
|
_set_tssldt_desc(((char *) (n)),((int)(addr)),((size << 3) - 1),"0x82")
|
|
|
|
|
|
#endif
|