Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#ifndef __UM_PROCESSOR_I386_H
7#define __UM_PROCESSOR_I386_H
8
9#include "linux/string.h"
10#include "asm/host_ldt.h"
11#include "asm/segment.h"
12
13extern int host_has_xmm;
14extern int host_has_cmov;
15
16/* include faultinfo structure */
17#include "sysdep/faultinfo.h"
18
19struct uml_tls_struct {
20 struct user_desc tls;
21 unsigned flushed:1;
22 unsigned present:1;
23};
24
25struct arch_thread {
26 struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
27 unsigned long debugregs[8];
28 int debugregs_seq;
29 struct faultinfo faultinfo;
30};
31
32#define INIT_ARCH_THREAD { \
33 .tls_array = { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
34 { .present = 0, .flushed = 0 } }, \
35 .debugregs = { [ 0 ... 7 ] = 0 }, \
36 .debugregs_seq = 0, \
37 .faultinfo = { 0, 0, 0 } \
38}
39
40static inline void arch_flush_thread(struct arch_thread *thread)
41{
42 /* Clear any TLS still hanging */
43 memset(&thread->tls_array, 0, sizeof(thread->tls_array));
44}
45
46static inline void arch_copy_thread(struct arch_thread *from,
47 struct arch_thread *to)
48{
49 memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
50}
51
52#include "asm/arch/user.h"
53
54/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
55static inline void rep_nop(void)
56{
57 __asm__ __volatile__("rep;nop": : :"memory");
58}
59
60#define cpu_relax() rep_nop()
61
62/*
63 * Default implementation of macro that returns current
64 * instruction pointer ("program counter"). Stolen
65 * from asm-i386/processor.h
66 */
67#define current_text_addr() \
68 ({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
69
70#define ARCH_IS_STACKGROW(address) \
71 (address + 32 >= UPT_SP(¤t->thread.regs.regs))
72
73#define KSTK_EIP(tsk) KSTK_REG(tsk, EIP)
74#define KSTK_ESP(tsk) KSTK_REG(tsk, UESP)
75#define KSTK_EBP(tsk) KSTK_REG(tsk, EBP)
76
77#include "asm/processor-generic.h"
78
79#endif