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
  13 extern int host_has_cmov;
  14
  15 /* include faultinfo structure */
  16 #include "sysdep/faultinfo.h"
  17
  18 struct uml_tls_struct {
  19         struct user_desc tls;
  20         unsigned flushed:1;
  21         unsigned present:1;
  22 };
  23
  24 struct 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
  39 static 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
  45 static 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. */
  54 static 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