mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
f6e20fc6ca
ARM memory layout fixes: the abort-stack is now set up in the correct RAM area, and the BSS is zeroed out as it should be. Furthermore, the magic variables 'armboot_end' and 'armboot_end_data' of the linker scripts are replaced by '__bss_start' and '_end', resp., which is a further step to eliminate unnecessary differences between the implementation of the CPU architectures.
145 lines
3 KiB
C
145 lines
3 KiB
C
/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.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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/*
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* CPU specific code
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*/
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#include <common.h>
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#include <command.h>
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int cpu_init (void)
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{
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/*
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* setup up stacks if necessary
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*/
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#ifdef CONFIG_USE_IRQ
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DECLARE_GLOBAL_DATA_PTR;
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IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
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FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
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#endif
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return 0;
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}
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int cleanup_before_linux (void)
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{
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/*
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* this function is called just before we call linux
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* it prepares the processor for linux
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*
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* just disable everything that can disturb booting linux
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*/
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unsigned long i;
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disable_interrupts ();
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/* turn off I-cache */
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asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
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i &= ~0x1000;
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asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
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/* flush I-cache */
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asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
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return (0);
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}
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int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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extern void reset_cpu (ulong addr);
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printf ("resetting ...\n");
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udelay (50000); /* wait 50 ms */
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disable_interrupts ();
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reset_cpu (0);
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/*NOTREACHED*/
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return (0);
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}
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/* taken from blob */
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void icache_enable (void)
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{
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register u32 i;
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/* read control register */
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asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
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/* set i-cache */
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i |= 0x1000;
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/* write back to control register */
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asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
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}
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void icache_disable (void)
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{
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register u32 i;
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/* read control register */
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asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
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/* clear i-cache */
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i &= ~0x1000;
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/* write back to control register */
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asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
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/* flush i-cache */
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asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
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}
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int icache_status (void)
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{
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register u32 i;
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/* read control register */
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asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
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/* return bit */
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return (i & 0x1000);
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}
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/* we will never enable dcache, because we have to setup MMU first */
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void dcache_enable (void)
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{
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return;
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}
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void dcache_disable (void)
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{
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return;
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}
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int dcache_status (void)
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{
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return 0; /* always off */
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}
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