processor_32.h

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/*
 * Copyright (C) 2002 Jeff Dike ([email protected])
 * Licensed under the GPL
 */

#ifndef __UM_PROCESSOR_I386_H
#define __UM_PROCESSOR_I386_H

#include <linux/string.h>
#include <asm/segment.h>
#include <asm/ldt.h>

extern int host_has_cmov;

struct uml_tls_struct {
    struct user_desc tls;
    unsigned flushed:1;
    unsigned present:1;
};

struct arch_thread {
    struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
    unsigned long debugregs[8];
    int debugregs_seq;
    struct faultinfo faultinfo;
};

#define INIT_ARCH_THREAD { \
    .tls_array          = { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
                    { .present = 0, .flushed = 0 } }, \
    .debugregs          = { [ 0 ... 7 ] = 0 }, \
    .debugregs_seq      = 0, \
    .faultinfo      = { 0, 0, 0 } \
}

static inline void arch_flush_thread(struct arch_thread *thread)
{
    /* Clear any TLS still hanging */
    memset(&thread->tls_array, 0, sizeof(thread->tls_array));
}

static inline void arch_copy_thread(struct arch_thread *from,
                                    struct arch_thread *to)
{
        memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
}

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter"). Stolen
 * from asm-i386/processor.h
 */
#define current_text_addr() \
    ({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })

#endif