Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  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
 79 
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