615e73b3cd
Older versions of kexec-tools has a zImage loader that passes a virtual address as entry point. The elf loader otoh it passes a physical address as entry point, and pages are always passed as physical addresses as well. Only allow physical addresses from now on. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
162 lines
4.3 KiB
C
162 lines
4.3 KiB
C
/*
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* machine_kexec.c - handle transition of Linux booting another kernel
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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*
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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* LANDISK/sh4 supported by kogiidena
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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/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/numa.h>
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#include <linux/ftrace.h>
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#include <linux/suspend.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/cacheflush.h>
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typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
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unsigned long reboot_code_buffer,
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unsigned long start_address);
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extern const unsigned char relocate_new_kernel[];
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extern const unsigned int relocate_new_kernel_size;
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extern void *gdb_vbr_vector;
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extern void *vbr_base;
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void machine_shutdown(void)
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{
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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}
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/*
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* Do what every setup is needed on image and the
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* reboot code buffer to allow us to avoid allocations
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* later.
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*/
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int machine_kexec_prepare(struct kimage *image)
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{
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/* older versions of kexec-tools are passing
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* the zImage entry point as a virtual address.
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*/
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if (image->start != PHYSADDR(image->start))
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return -EINVAL; /* upgrade your kexec-tools */
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return 0;
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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}
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static void kexec_info(struct kimage *image)
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{
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int i;
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printk("kexec information\n");
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for (i = 0; i < image->nr_segments; i++) {
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printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
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i,
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(unsigned int)image->segment[i].mem,
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(unsigned int)image->segment[i].mem +
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image->segment[i].memsz,
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(unsigned int)image->segment[i].memsz);
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}
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printk(" start : 0x%08x\n\n", (unsigned int)image->start);
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}
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/*
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* Do not allocate memory (or fail in any way) in machine_kexec().
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* We are past the point of no return, committed to rebooting now.
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*/
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void machine_kexec(struct kimage *image)
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{
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unsigned long page_list;
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unsigned long reboot_code_buffer;
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relocate_new_kernel_t rnk;
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unsigned long entry;
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unsigned long *ptr;
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int save_ftrace_enabled;
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/*
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* Nicked from the mips version of machine_kexec():
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* The generic kexec code builds a page list with physical
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* addresses. Use phys_to_virt() to convert them to virtual.
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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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#ifdef CONFIG_KEXEC_JUMP
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if (image->preserve_context)
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save_processor_state();
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#endif
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save_ftrace_enabled = __ftrace_enabled_save();
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/* Interrupts aren't acceptable while we reboot */
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local_irq_disable();
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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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/* 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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kexec_info(image);
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flush_cache_all();
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#if defined(CONFIG_SH_STANDARD_BIOS)
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asm volatile("ldc %0, vbr" :
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: "r" (((unsigned long) gdb_vbr_vector) - 0x100)
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: "memory");
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#endif
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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,
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(unsigned long)phys_to_virt(image->start));
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#ifdef CONFIG_KEXEC_JUMP
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asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
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if (image->preserve_context)
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restore_processor_state();
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/* Convert page list back to physical addresses, what a mess. */
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for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
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ptr = (*ptr & IND_INDIRECTION) ?
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phys_to_virt(*ptr & 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 = virt_to_phys(*ptr);
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}
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#endif
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__ftrace_enabled_restore(save_ftrace_enabled);
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}
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void arch_crash_save_vmcoreinfo(void)
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{
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#ifdef CONFIG_NUMA
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VMCOREINFO_SYMBOL(node_data);
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VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
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#endif
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}
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