mirror of
https://github.com/brain-hackers/u-boot-brain
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8d61625d6a
Putting global data on the stack simplifies the init process (and makes it slightly quicker). During the 'flash' stage of the init sequence, global data is in the CAR stack. After SDRAM is initialised, global data is copied from CAR to the SDRAM stack Signed-off-by: Graeme Russ <graeme.russ@gmail.com> Signed-off-by: Simon Glass <sjg@chromium.org>
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
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* (C) Copyright 2002-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __ASM_GBL_DATA_H
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#define __ASM_GBL_DATA_H
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/*
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* The following data structure is placed in some memory wich is
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* available very early after boot (like DPRAM on MPC8xx/MPC82xx, or
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* some locked parts of the data cache) to allow for a minimum set of
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* global variables during system initialization (until we have set
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* up the memory controller so that we can use RAM).
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*/
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#ifndef __ASSEMBLY__
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typedef struct global_data gd_t;
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struct global_data {
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/* NOTE: gd_addr MUST be first member of struct global_data! */
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gd_t *gd_addr; /* Location of Global Data */
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bd_t *bd;
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unsigned long flags;
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unsigned int baudrate;
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unsigned long have_console; /* serial_init() was called */
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#ifdef CONFIG_PRE_CONSOLE_BUFFER
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unsigned long precon_buf_idx; /* Pre-Console buffer index */
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#endif
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unsigned long reloc_off; /* Relocation Offset */
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unsigned long load_off; /* Load Offset */
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unsigned long env_addr; /* Address of Environment struct */
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unsigned long env_valid; /* Checksum of Environment valid? */
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unsigned long cpu_clk; /* CPU clock in Hz! */
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unsigned long bus_clk;
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unsigned long relocaddr; /* Start address of U-Boot in RAM */
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unsigned long start_addr_sp; /* start_addr_stackpointer */
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unsigned long gdt_addr; /* Location of GDT */
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phys_size_t ram_size; /* RAM size */
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unsigned long reset_status; /* reset status register at boot */
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void **jt; /* jump table */
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char env_buf[32]; /* buffer for getenv() before reloc. */
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};
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static inline gd_t *get_fs_gd_ptr(void)
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{
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gd_t *gd_ptr;
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asm volatile("fs movl 0, %0\n" : "=r" (gd_ptr));
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return gd_ptr;
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}
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#define gd get_fs_gd_ptr()
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#endif
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#include <asm-generic/global_data_flags.h>
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#define DECLARE_GLOBAL_DATA_PTR
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#endif /* __ASM_GBL_DATA_H */
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