cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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core_32.c (2078B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * PPC32 code to handle Linux booting another kernel.
      4 *
      5 * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
      6 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
      7 * Copyright (C) 2005 IBM Corporation.
      8 */
      9
     10#include <linux/kexec.h>
     11#include <linux/mm.h>
     12#include <linux/string.h>
     13#include <asm/cacheflush.h>
     14#include <asm/hw_irq.h>
     15#include <asm/io.h>
     16
     17typedef void (*relocate_new_kernel_t)(
     18				unsigned long indirection_page,
     19				unsigned long reboot_code_buffer,
     20				unsigned long start_address) __noreturn;
     21
     22/*
     23 * This is a generic machine_kexec function suitable at least for
     24 * non-OpenFirmware embedded platforms.
     25 * It merely copies the image relocation code to the control page and
     26 * jumps to it.
     27 * A platform specific function may just call this one.
     28 */
     29void default_machine_kexec(struct kimage *image)
     30{
     31	extern const unsigned int relocate_new_kernel_size;
     32	unsigned long page_list;
     33	unsigned long reboot_code_buffer, reboot_code_buffer_phys;
     34	relocate_new_kernel_t rnk;
     35
     36	/* Interrupts aren't acceptable while we reboot */
     37	local_irq_disable();
     38
     39	/* mask each interrupt so we are in a more sane state for the
     40	 * kexec kernel */
     41	machine_kexec_mask_interrupts();
     42
     43	page_list = image->head;
     44
     45	/* we need both effective and real address here */
     46	reboot_code_buffer =
     47			(unsigned long)page_address(image->control_code_page);
     48	reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
     49
     50	/* copy our kernel relocation code to the control code page */
     51	memcpy((void *)reboot_code_buffer, relocate_new_kernel,
     52						relocate_new_kernel_size);
     53
     54	flush_icache_range(reboot_code_buffer,
     55				reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
     56	printk(KERN_INFO "Bye!\n");
     57
     58	if (!IS_ENABLED(CONFIG_FSL_BOOKE) && !IS_ENABLED(CONFIG_44x))
     59		relocate_new_kernel(page_list, reboot_code_buffer_phys, image->start);
     60
     61	/* now call it */
     62	rnk = (relocate_new_kernel_t) reboot_code_buffer;
     63	(*rnk)(page_list, reboot_code_buffer_phys, image->start);
     64}
     65
     66int machine_kexec_prepare(struct kimage *image)
     67{
     68	return 0;
     69}