91ffaa2783
Since there is not indirection page in crash type, so the vaule of the head field of kimage structure is not equal to the address of indirection page but IND_DONE. so we have to set kexec_indirection_page variable to the address of the head field of image structure. [ralf@linux-mips.org: Don't add pointless empty line, fix trailing whitespace damage.] Signed-off-by: Yang Wei <Wei.Yang@windriver.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/7499/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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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