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 67