arch/x86/um/asm/processor_32.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 <asm/segment.h>
  11 #include <asm/ldt.h>
  12
  13 extern int host_has_cmov;
  14
  15 struct uml_tls_struct {
  16         struct user_desc tls;
  17         unsigned flushed:1;
  18         unsigned present:1;
  19 };
  20
  21 struct arch_thread {
  22         struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
  23         unsigned long debugregs[8];
  24         int debugregs_seq;
  25         struct faultinfo faultinfo;
  26 };
  27
  28 #define INIT_ARCH_THREAD { \
  29         .tls_array              = { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
  30                                     { .present = 0, .flushed = 0 } }, \
  31         .debugregs              = { [ 0 ... 7 ] = 0 }, \
  32         .debugregs_seq          = 0, \
  33         .faultinfo              = { 0, 0, 0 } \
  34 }
  35
  36 static inline void arch_flush_thread(struct arch_thread *thread)
  37 {
  38         /* Clear any TLS still hanging */
  39         memset(&thread->tls_array, 0, sizeof(thread->tls_array));
  40 }
  41
  42 static inline void arch_copy_thread(struct arch_thread *from,
  43                                     struct arch_thread *to)
  44 {
  45         memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
  46 }
  47
  48 #include <asm/user.h>
  49
  50 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
  51 static inline void rep_nop(void)
  52 {
  53         __asm__ __volatile__("rep;nop": : :"memory");
  54 }
  55
  56 #define cpu_relax()     rep_nop()
  57
  58 /*
  59  * Default implementation of macro that returns current
  60  * instruction pointer ("program counter"). Stolen
  61  * from asm-i386/processor.h
  62  */
  63 #define current_text_addr() \
  64         ({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
  65
  66 #endif