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>
76 lines
1.7 KiB
C
76 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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