4d5ade5b29
This adds support for kexec based crash dumps. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/*
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* machine_kexec.c - handle transition of Linux booting another kernel
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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*
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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* LANDISK/sh4 supported by kogiidena
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/cacheflush.h>
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typedef NORET_TYPE void (*relocate_new_kernel_t)(
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unsigned long indirection_page,
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unsigned long reboot_code_buffer,
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unsigned long start_address,
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unsigned long vbr_reg) ATTRIB_NORET;
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extern const unsigned char relocate_new_kernel[];
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extern const unsigned int relocate_new_kernel_size;
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extern void *gdb_vbr_vector;
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void machine_shutdown(void)
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{
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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}
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/*
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* Do what every setup is needed on image and the
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* reboot code buffer to allow us to avoid allocations
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* later.
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*/
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int machine_kexec_prepare(struct kimage *image)
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{
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return 0;
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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}
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static void kexec_info(struct kimage *image)
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{
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int i;
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printk("kexec information\n");
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for (i = 0; i < image->nr_segments; i++) {
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printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
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i,
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(unsigned int)image->segment[i].mem,
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(unsigned int)image->segment[i].mem +
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image->segment[i].memsz,
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(unsigned int)image->segment[i].memsz);
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}
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printk(" start : 0x%08x\n\n", (unsigned int)image->start);
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}
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/*
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* Do not allocate memory (or fail in any way) in machine_kexec().
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* We are past the point of no return, committed to rebooting now.
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*/
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NORET_TYPE void machine_kexec(struct kimage *image)
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{
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unsigned long page_list;
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unsigned long reboot_code_buffer;
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unsigned long vbr_reg;
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relocate_new_kernel_t rnk;
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#if defined(CONFIG_SH_STANDARD_BIOS)
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vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
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#else
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vbr_reg = 0x80000000; // dummy
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#endif
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/* Interrupts aren't acceptable while we reboot */
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local_irq_disable();
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page_list = image->head;
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/* we need both effective and real address here */
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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/* copy our kernel relocation code to the control code page */
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memcpy((void *)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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kexec_info(image);
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flush_cache_all();
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/* now call it */
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rnk = (relocate_new_kernel_t) reboot_code_buffer;
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(*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
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}
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/* crashkernel=size@addr specifies the location to reserve for
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* a crash kernel. By reserving this memory we guarantee
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* that linux never sets it up as a DMA target.
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* Useful for holding code to do something appropriate
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* after a kernel panic.
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*/
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static int __init parse_crashkernel(char *arg)
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{
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unsigned long size, base;
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size = memparse(arg, &arg);
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if (*arg == '@') {
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base = memparse(arg+1, &arg);
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/* FIXME: Do I want a sanity check
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* to validate the memory range?
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*/
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crashk_res.start = base;
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crashk_res.end = base + size - 1;
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}
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return 0;
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}
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early_param("crashkernel", parse_crashkernel);
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