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