Import of Linus's Linux 1.1.68

1 files changed, 107 insertions, 0 deletions

diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h
new file mode 100644
index 000000000..04c8b96b6
--- /dev/null
+++ b/include/asm-i386/system.h
@@ -0,0 +1,107 @@
+#ifndef __ASM_SYSTEM_H
+#define __ASM_SYSTEM_H
+
+#include <asm/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