2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #ifndef __UM_PROCESSOR_I386_H
7 #define __UM_PROCESSOR_I386_H
9 #include <linux/string.h>
10 #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 KSTK_EIP(tsk) KSTK_REG(tsk, EIP)
67 #define KSTK_ESP(tsk) KSTK_REG(tsk, UESP)
68 #define KSTK_EBP(tsk) KSTK_REG(tsk, EBP)