arch/x86/include/asm/global_data.h

   1 /*
   2  * (C) Copyright 2002-2010
   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 GENERATED_GBL_DATA_SIZE > sizeof(gd_t)
  34  */
  35
  36 #ifndef __ASSEMBLY__
  37
  38 typedef struct global_data {
  39         bd_t            *bd;
  40         unsigned long   flags;
  41         unsigned long   baudrate;
  42         unsigned long   have_console;   /* serial_init() was called */
  43         unsigned long   reloc_off;      /* Relocation Offset */
  44         unsigned long   load_off;       /* Load Offset */
  45         unsigned long   env_addr;       /* Address  of Environment struct */
  46         unsigned long   env_valid;      /* Checksum of Environment valid? */
  47         unsigned long   cpu_clk;        /* CPU clock in Hz!             */
  48         unsigned long   bus_clk;
  49         unsigned long   relocaddr;      /* Start address of U-Boot in RAM */
  50         unsigned long   start_addr_sp;  /* start_addr_stackpointer */
  51         phys_size_t     ram_size;       /* RAM size */
  52         unsigned long   reset_status;   /* reset status register at boot */
  53         void            **jt;           /* jump table */
  54         char            env_buf[32];    /* buffer for getenv() before reloc. */
  55 } gd_t;
  56
  57 extern gd_t *gd;
  58
  59 #endif
  60
  61 /* Word Offsets into Global Data - MUST match struct gd_t */
  62 #define GD_BD           0
  63 #define GD_FLAGS        1
  64 #define GD_BAUDRATE     2
  65 #define GD_HAVE_CONSOLE 3
  66 #define GD_RELOC_OFF    4
  67 #define GD_LOAD_OFF     5
  68 #define GD_ENV_ADDR     6
  69 #define GD_ENV_VALID    7
  70 #define GD_CPU_CLK      8
  71 #define GD_BUS_CLK      9
  72 #define GD_RELOC_ADDR   10
  73 #define GD_START_ADDR_SP        11
  74 #define GD_RAM_SIZE     12
  75 #define GD_RESET_STATUS 13
  76 #define GD_JT           14
  77
  78 #define GD_SIZE         15
  79
  80 /*
  81  * Global Data Flags
  82  */
  83 #define GD_FLG_RELOC            0x00001 /* Code was relocated to RAM            */
  84 #define GD_FLG_DEVINIT          0x00002 /* Devices have been initialized        */
  85 #define GD_FLG_SILENT           0x00004 /* Silent mode                          */
  86 #define GD_FLG_POSTFAIL         0x00008 /* Critical POST test failed            */
  87 #define GD_FLG_POSTSTOP         0x00010 /* POST seqeunce aborted                */
  88 #define GD_FLG_LOGINIT          0x00020 /* Log Buffer has been initialized      */
  89 #define GD_FLG_DISABLE_CONSOLE  0x00040 /* Disable console (in & out)           */
  90 #define GD_FLG_ENV_READY        0x00080 /* Environment imported into hash table */
  91 #define GD_FLG_COLD_BOOT        0x00100 /* Cold Boot */
  92 #define GD_FLG_WARM_BOOT        0x00200 /* Warm Boot */
  93
  94 #if 0
  95 #define DECLARE_GLOBAL_DATA_PTR
  96 #else
  97 #define XTRN_DECLARE_GLOBAL_DATA_PTR    extern
  98 #define DECLARE_GLOBAL_DATA_PTR     XTRN_DECLARE_GLOBAL_DATA_PTR \
  99 gd_t *gd
 100 #endif
 101
 102 #endif /* __ASM_GBL_DATA_H */