LXR linux/arch/um/sys-i386/asm/processor.h

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