3 * Licensed under the GPL
6 #ifndef __UM_PROCESSOR_I386_H
7 #define __UM_PROCESSOR_I386_H
9 #include <linux/string.h>
10 #include <sysdep/host_ldt.h>
11 #include <asm/segment.h>
13 extern int host_has_cmov;
15 struct uml_tls_struct {
22 struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
23 unsigned long debugregs[8];
25 struct faultinfo faultinfo;
28 #define INIT_ARCH_THREAD { \
29 .tls_array = { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
30 { .present = 0, .flushed = 0 } }, \
31 .debugregs = { [ 0 ... 7 ] = 0 }, \
33 .faultinfo = { 0, 0, 0 } \
36 static inline void arch_flush_thread(struct arch_thread *thread)
38 /* Clear any TLS still hanging */
39 memset(&thread->tls_array, 0, sizeof(thread->tls_array));
42 static inline void arch_copy_thread(struct arch_thread *from,
43 struct arch_thread *to)
45 memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
50 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
51 static inline void rep_nop(void)
53 __asm__ __volatile__("rep;nop": : :"memory");
56 #define cpu_relax() rep_nop()
59 * Default implementation of macro that returns current
60 * instruction pointer ("program counter"). Stolen
61 * from asm-i386/processor.h
63 #define current_text_addr() \
64 ({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
66 #define ARCH_IS_STACKGROW(address) \
67 (address + 32 >= UPT_SP(¤t->thread.regs.regs))
69 #define KSTK_EIP(tsk) KSTK_REG(tsk, EIP)
70 #define KSTK_ESP(tsk) KSTK_REG(tsk, UESP)
71 #define KSTK_EBP(tsk) KSTK_REG(tsk, EBP)