mirror of https://gitee.com/openkylin/linux.git
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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* machine_kexec.c for kexec
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* Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
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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/compiler.h>
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#include <linux/kexec.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <asm/cacheflush.h>
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#include <asm/page.h>
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extern const unsigned char relocate_new_kernel[];
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extern const size_t relocate_new_kernel_size;
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extern unsigned long kexec_start_address;
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extern unsigned long kexec_indirection_page;
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int (*_machine_kexec_prepare)(struct kimage *) = NULL;
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void (*_machine_kexec_shutdown)(void) = NULL;
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void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
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#ifdef CONFIG_SMP
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void (*relocated_kexec_smp_wait) (void *);
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atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
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#endif
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int
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machine_kexec_prepare(struct kimage *kimage)
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{
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if (_machine_kexec_prepare)
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return _machine_kexec_prepare(kimage);
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return 0;
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}
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void
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machine_kexec_cleanup(struct kimage *kimage)
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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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if (_machine_kexec_shutdown)
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_machine_kexec_shutdown();
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}
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void
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machine_crash_shutdown(struct pt_regs *regs)
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{
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if (_machine_crash_shutdown)
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_machine_crash_shutdown(regs);
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else
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default_machine_crash_shutdown(regs);
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}
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typedef void (*noretfun_t)(void) __noreturn;
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void
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machine_kexec(struct kimage *image)
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{
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unsigned long reboot_code_buffer;
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unsigned long entry;
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unsigned long *ptr;
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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kexec_start_address =
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(unsigned long) phys_to_virt(image->start);
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if (image->type == KEXEC_TYPE_DEFAULT) {
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kexec_indirection_page =
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(unsigned long) phys_to_virt(image->head & PAGE_MASK);
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} else {
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kexec_indirection_page = (unsigned long)&image->head;
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}
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memcpy((void*)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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/*
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* The generic kexec code builds a page list with physical
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* addresses. they are directly accessible through KSEG0 (or
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* CKSEG0 or XPHYS if on 64bit system), hence the
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* phys_to_virt() call.
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*/
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for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
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ptr = (entry & IND_INDIRECTION) ?
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phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
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if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
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*ptr & IND_DESTINATION)
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*ptr = (unsigned long) phys_to_virt(*ptr);
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}
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/*
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* we do not want to be bothered.
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*/
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local_irq_disable();
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printk("Will call new kernel at %08lx\n", image->start);
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printk("Bye ...\n");
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__flush_cache_all();
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#ifdef CONFIG_SMP
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/* All secondary cpus now may jump to kexec_wait cycle */
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relocated_kexec_smp_wait = reboot_code_buffer +
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(void *)(kexec_smp_wait - relocate_new_kernel);
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smp_wmb();
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atomic_set(&kexec_ready_to_reboot, 1);
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#endif
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((noretfun_t) reboot_code_buffer)();
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}
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