70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PPC32 code to handle Linux booting another kernel.
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*
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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* Copyright (C) 2005 IBM Corporation.
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*/
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#include <linux/kexec.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <asm/cacheflush.h>
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#include <asm/hw_irq.h>
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#include <asm/io.h>
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typedef void (*relocate_new_kernel_t)(
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unsigned long indirection_page,
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unsigned long reboot_code_buffer,
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unsigned long start_address) __noreturn;
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/*
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* This is a generic machine_kexec function suitable at least for
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* non-OpenFirmware embedded platforms.
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* It merely copies the image relocation code to the control page and
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* jumps to it.
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* A platform specific function may just call this one.
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*/
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void default_machine_kexec(struct kimage *image)
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{
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extern const unsigned int relocate_new_kernel_size;
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unsigned long page_list;
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unsigned long reboot_code_buffer, reboot_code_buffer_phys;
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relocate_new_kernel_t rnk;
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/* Interrupts aren't acceptable while we reboot */
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local_irq_disable();
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/* mask each interrupt so we are in a more sane state for the
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* kexec kernel */
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machine_kexec_mask_interrupts();
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page_list = image->head;
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/* we need both effective and real address here */
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
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/* copy our kernel relocation code to the control code page */
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memcpy((void *)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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flush_icache_range(reboot_code_buffer,
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reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
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printk(KERN_INFO "Bye!\n");
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if (!IS_ENABLED(CONFIG_PPC_85xx) && !IS_ENABLED(CONFIG_44x))
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relocate_new_kernel(page_list, reboot_code_buffer_phys, image->start);
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/* now call it */
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rnk = (relocate_new_kernel_t) reboot_code_buffer;
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(*rnk)(page_list, reboot_code_buffer_phys, image->start);
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}
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int machine_kexec_prepare(struct kimage *image)
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{
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return 0;
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}
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