forked from Minki/linux
2c2df118a6
Always reboot on logical cpu 0. This makes sure that the IPL cpu is always the same and usually avoids strange numbering schemes between physical and logical cpus. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
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* arch/s390/kernel/machine_kexec.c
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*
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* Copyright IBM Corp. 2005,2006
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*
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* Author(s): Rolf Adelsberger,
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#include <linux/device.h>
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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/cio.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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#include <asm/smp.h>
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#include <asm/reset.h>
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#include <asm/ipl.h>
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typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
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extern const unsigned char relocate_kernel[];
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extern const unsigned long long relocate_kernel_len;
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int machine_kexec_prepare(struct kimage *image)
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{
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void *reboot_code_buffer;
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/* Can't replace kernel image since it is read-only. */
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if (ipl_flags & IPL_NSS_VALID)
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return -ENOSYS;
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/* We don't support anything but the default image type for now. */
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if (image->type != KEXEC_TYPE_DEFAULT)
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return -EINVAL;
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/* Get the destination where the assembler code should be copied to.*/
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reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
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/* Then copy it */
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memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
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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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void machine_shutdown(void)
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{
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}
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static void __machine_kexec(void *data)
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{
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relocate_kernel_t data_mover;
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struct kimage *image = data;
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pfault_fini();
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s390_reset_system();
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data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
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/* Call the moving routine */
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(*data_mover)(&image->head, image->start);
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for (;;);
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}
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void machine_kexec(struct kimage *image)
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{
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smp_send_stop();
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smp_switch_to_ipl_cpu(__machine_kexec, image);
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}
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