99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
/*
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* arch/s390/kernel/machine_kexec.c
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*
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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*
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*/
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/*
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* s390_machine_kexec.c - handle the transition of Linux booting another kernel
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* on the S390 architecture.
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*/
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#include <asm/cio.h>
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#include <asm/setup.h>
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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 <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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static void kexec_halt_all_cpus(void *);
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typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long);
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const extern unsigned char relocate_kernel[];
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const extern unsigned long long relocate_kernel_len;
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int
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machine_kexec_prepare(struct kimage *image)
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{
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unsigned long reboot_code_buffer;
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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 = page_to_pfn(image->control_code_page)<<PAGE_SHIFT;
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/* Then copy it */
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memcpy((void *) reboot_code_buffer, relocate_kernel,
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relocate_kernel_len);
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return 0;
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}
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void
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machine_kexec_cleanup(struct kimage *image)
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{
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}
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void
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machine_shutdown(void)
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{
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printk(KERN_INFO "kexec: machine_shutdown called\n");
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}
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NORET_TYPE void
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machine_kexec(struct kimage *image)
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{
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clear_all_subchannels();
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/* Disable lowcore protection */
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ctl_clear_bit(0,28);
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on_each_cpu(kexec_halt_all_cpus, image, 0, 0);
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for (;;);
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}
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static void
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kexec_halt_all_cpus(void *kernel_image)
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{
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static atomic_t cpuid = ATOMIC_INIT(-1);
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int cpu;
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struct kimage *image;
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relocate_kernel_t data_mover;
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if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
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signal_processor(smp_processor_id(), sigp_stop);
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/* Wait for all other cpus to enter stopped state */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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while (!smp_cpu_not_running(cpu))
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cpu_relax();
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}
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image = (struct kimage *) kernel_image;
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data_mover = (relocate_kernel_t)
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(page_to_pfn(image->control_code_page) << PAGE_SHIFT);
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/* Call the moving routine */
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(*data_mover) (&image->head, image->start);
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}
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