include/asm-um/processor-i386.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/host_ldt.h"
  11 #include "asm/segment.h"
  12
  13 extern int host_has_xmm;
  14 extern int host_has_cmov;
  15
  16 /* include faultinfo structure */
  17 #include "sysdep/faultinfo.h"
  18
  19 struct uml_tls_struct {
  20         struct user_desc tls;
  21         unsigned flushed:1;
  22         unsigned present:1;
  23 };
  24
  25 struct 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
  40 static 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
  46 static 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. */
  55 static 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(&current->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