u-boot/arch/x86/include/asm/global_data.h

/*
 * (C) Copyright 2002-2010
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef	__ASM_GBL_DATA_H
#define __ASM_GBL_DATA_H

#ifndef __ASSEMBLY__

/* Architecture-specific global data */
struct arch_global_data {
	struct global_data *gd_addr;		/* Location of Global Data */
	uint64_t tsc_base;		/* Initial value returned by rdtsc() */
	uint32_t tsc_base_kclocks;	/* Initial tsc as a kclocks value */
	uint32_t tsc_prev;		/* For show_boot_progress() */
};

#endif

#include <asm-generic/global_data.h>

#ifndef __ASSEMBLY__
static inline gd_t *get_fs_gd_ptr(void)
{
	gd_t *gd_ptr;

	asm volatile("fs movl 0, %0\n" : "=r" (gd_ptr));

	return gd_ptr;
}

#define gd	get_fs_gd_ptr()

#endif

/*
 * Our private Global Data Flags
 */
#define GD_FLG_COLD_BOOT	0x00100	/* Cold Boot */
#define GD_FLG_WARM_BOOT	0x00200	/* Warm Boot */

#define DECLARE_GLOBAL_DATA_PTR

#endif /* __ASM_GBL_DATA_H */