mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 13:26:48 +07:00
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>
163 lines
4.3 KiB
C
163 lines
4.3 KiB
C
/*
|
|
* machine_kexec.c - handle transition of Linux booting another kernel
|
|
* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
|
|
*
|
|
* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
|
|
* LANDISK/sh4 supported by kogiidena
|
|
*
|
|
* This source code is licensed under the GNU General Public License,
|
|
* Version 2. See the file COPYING for more details.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/numa.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/suspend.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/io.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
|
|
unsigned long reboot_code_buffer,
|
|
unsigned long start_address);
|
|
|
|
extern const unsigned char relocate_new_kernel[];
|
|
extern const unsigned int relocate_new_kernel_size;
|
|
extern void *gdb_vbr_vector;
|
|
extern void *vbr_base;
|
|
|
|
void machine_shutdown(void)
|
|
{
|
|
}
|
|
|
|
void machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Do what every setup is needed on image and the
|
|
* reboot code buffer to allow us to avoid allocations
|
|
* later.
|
|
*/
|
|
int machine_kexec_prepare(struct kimage *image)
|
|
{
|
|
/* older versions of kexec-tools are passing
|
|
* the zImage entry point as a virtual address.
|
|
*/
|
|
if (image->start != PHYSADDR(image->start))
|
|
return -EINVAL; /* upgrade your kexec-tools */
|
|
|
|
return 0;
|
|
}
|
|
|
|
void machine_kexec_cleanup(struct kimage *image)
|
|
{
|
|
}
|
|
|
|
static void kexec_info(struct kimage *image)
|
|
{
|
|
int i;
|
|
printk("kexec information\n");
|
|
for (i = 0; i < image->nr_segments; i++) {
|
|
printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
|
|
i,
|
|
(unsigned int)image->segment[i].mem,
|
|
(unsigned int)image->segment[i].mem +
|
|
image->segment[i].memsz,
|
|
(unsigned int)image->segment[i].memsz);
|
|
}
|
|
printk(" start : 0x%08x\n\n", (unsigned int)image->start);
|
|
}
|
|
|
|
/*
|
|
* Do not allocate memory (or fail in any way) in machine_kexec().
|
|
* We are past the point of no return, committed to rebooting now.
|
|
*/
|
|
void machine_kexec(struct kimage *image)
|
|
{
|
|
unsigned long page_list;
|
|
unsigned long reboot_code_buffer;
|
|
relocate_new_kernel_t rnk;
|
|
unsigned long entry;
|
|
unsigned long *ptr;
|
|
int save_ftrace_enabled;
|
|
|
|
/*
|
|
* Nicked from the mips version of machine_kexec():
|
|
* The generic kexec code builds a page list with physical
|
|
* addresses. Use phys_to_virt() to convert them to virtual.
|
|
*/
|
|
for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
|
|
ptr = (entry & IND_INDIRECTION) ?
|
|
phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
|
|
if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
|
|
*ptr & IND_DESTINATION)
|
|
*ptr = (unsigned long) phys_to_virt(*ptr);
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC_JUMP
|
|
if (image->preserve_context)
|
|
save_processor_state();
|
|
#endif
|
|
|
|
save_ftrace_enabled = __ftrace_enabled_save();
|
|
|
|
/* Interrupts aren't acceptable while we reboot */
|
|
local_irq_disable();
|
|
|
|
page_list = image->head;
|
|
|
|
/* we need both effective and real address here */
|
|
reboot_code_buffer =
|
|
(unsigned long)page_address(image->control_code_page);
|
|
|
|
/* copy our kernel relocation code to the control code page */
|
|
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
|
|
relocate_new_kernel_size);
|
|
|
|
kexec_info(image);
|
|
flush_cache_all();
|
|
|
|
#if defined(CONFIG_SH_STANDARD_BIOS)
|
|
asm volatile("ldc %0, vbr" :
|
|
: "r" (((unsigned long) gdb_vbr_vector) - 0x100)
|
|
: "memory");
|
|
#endif
|
|
|
|
/* now call it */
|
|
rnk = (relocate_new_kernel_t) reboot_code_buffer;
|
|
(*rnk)(page_list, reboot_code_buffer,
|
|
(unsigned long)phys_to_virt(image->start));
|
|
|
|
#ifdef CONFIG_KEXEC_JUMP
|
|
asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
|
|
|
|
if (image->preserve_context)
|
|
restore_processor_state();
|
|
|
|
/* Convert page list back to physical addresses, what a mess. */
|
|
for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
|
|
ptr = (*ptr & IND_INDIRECTION) ?
|
|
phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
|
|
if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
|
|
*ptr & IND_DESTINATION)
|
|
*ptr = virt_to_phys(*ptr);
|
|
}
|
|
#endif
|
|
|
|
__ftrace_enabled_restore(save_ftrace_enabled);
|
|
}
|
|
|
|
void arch_crash_save_vmcoreinfo(void)
|
|
{
|
|
#ifdef CONFIG_NUMA
|
|
VMCOREINFO_SYMBOL(node_data);
|
|
VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
|
|
#endif
|
|
}
|