include/asm-i386/global_data.h

   1 /*
   2  * (C) Copyright 2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #ifndef __ASM_GBL_DATA_H
  25 #define __ASM_GBL_DATA_H
  26 /*
  27  * The following data structure is placed in some memory wich is
  28  * available very early after boot (like DPRAM on MPC8xx/MPC82xx, or
  29  * some locked parts of the data cache) to allow for a minimum set of
  30  * global variables during system initialization (until we have set
  31  * up the memory controller so that we can use RAM).
  32  *
  33  * Keep it *SMALL* and remember to set CFG_GBL_DATA_SIZE > sizeof(gd_t)
  34  */
  35
  36 typedef struct {
  37         bd_t            *bd;
  38         unsigned long   flags;
  39         unsigned long   baudrate;
  40         unsigned long   have_console;   /* serial_init() was called */
  41         unsigned long   reloc_off;      /* Relocation Offset */
  42         unsigned long   env_addr;       /* Address  of Environment struct */
  43         unsigned long   env_valid;      /* Checksum of Environment valid? */
  44         unsigned long   cpu_clk;        /* CPU clock in Hz!             */
  45         unsigned long   bus_clk;
  46         unsigned long   ram_size;       /* RAM size */
  47         unsigned long   reset_status;   /* reset status register at boot */
  48         void            **jt;           /* jump table */
  49 } gd_t;
  50
  51 /*
  52  * Global Data Flags
  53  */
  54 #define GD_FLG_RELOC    0x00001         /* Code was relocated to RAM            */
  55 #define GD_FLG_DEVINIT  0x00002         /* Devices have been initialized        */
  56 #define GD_FLG_SILENT   0x00004         /* Silent mode                          */
  57 #define GD_FLG_POSTFAIL 0x00008         /* Critical POST test failed            */
  58
  59 extern gd_t *global_data;
  60
  61 #define DECLARE_GLOBAL_DATA_PTR     gd_t *gd = global_data
  62
  63 #endif /* __ASM_GBL_DATA_H */