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https://github.com/brain-hackers/u-boot-brain
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abf0cd3dff
Rewrite interrupt handling functionality for the i386 port. Separated functionality into separate CPU and Architecture components. It appears as if the i386 interrupt handler functionality was intended to allow multiple handlers to be installed for a given interrupt. Unfortunately, this functionality was not fully implemented and also had the problem that irq_free_handler() does not allow the passing of the handler function pointer and therefore could never be used to free specific handlers that had been installed for a given IRQ. There were also various issues with array bounds not being fully tested. I had two objectives in mind for the new implementation: 1) Keep the implementation as similar as possible to existing implementations. To that end, I have used the leon2/3 implementations as the reference 2) Seperate CPU and Architecture specific elements. All specific i386 interrupt functionality is now in cpu/i386/ with the high level API and architecture specific code in lib_i386. Functionality specific to the PC/AT architecture (i.e. cascaded i8259 PICs) has been further split out into an individual file to allow for the implementation of the PIC architecture of the SC520 CPU (supports more IRQs) Signed-off-by: Graeme Russ <graeme.russ at gmail.com>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
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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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* 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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#include <asm/interrupt.h>
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int cpu_init(void)
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{
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/* initialize FPU, reset EM, set MP and NE */
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asm ("fninit\n" \
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"movl %cr0, %eax\n" \
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"andl $~0x4, %eax\n" \
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"orl $0x22, %eax\n" \
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"movl %eax, %cr0\n" );
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/* Initialize core interrupt and exception functionality of CPU */
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cpu_init_interrupts ();
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cpu_init_exceptions ();
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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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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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void flush_cache (unsigned long dummy1, unsigned long dummy2)
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{
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asm("wbinvd\n");
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return;
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}
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void __attribute__ ((regparm(0))) generate_gpf(void);
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/* segment 0x70 is an arbitrary segment which does not exist */
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asm(".globl generate_gpf\n"
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"generate_gpf:\n"
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"ljmp $0x70, $0x47114711\n");
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void __reset_cpu(ulong addr)
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{
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printf("Resetting using i386 Triple Fault\n");
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set_vector(13, generate_gpf); /* general protection fault handler */
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set_vector(8, generate_gpf); /* double fault handler */
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generate_gpf(); /* start the show */
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}
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void reset_cpu(ulong addr) __attribute__((weak, alias("__reset_cpu")));
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