mirror of https://github.com/hak5/openwrt.git
160 lines
5.2 KiB
Diff
160 lines
5.2 KiB
Diff
From 03cd81fbca6b91317ec1a7b3b3c09fb8d08f83a6 Mon Sep 17 00:00:00 2001
|
|
From: Wu Zhangjin <wuzhangjin@gmail.com>
|
|
Date: Tue, 11 Jan 2011 18:42:08 +0000
|
|
Subject: MIPS: Kexec: Enhance the support
|
|
|
|
Changes:
|
|
o Print more information in machine_kexec() for debugging
|
|
E.g. with this information, the kexec_start_address has been found
|
|
it was wrong with 64bit kernel / o32 kexec-tools. Which must be
|
|
fixed later.
|
|
o Link relocate_kernel.S to a section for future extension
|
|
This allows more functions can be added for the kexec relocation
|
|
part even written in C. to add code into that section, you just need
|
|
to mark your function or data with __kexec or
|
|
__attribute__((__section__(".__kexec.relocate")))
|
|
|
|
TODO:
|
|
|
|
1. Make 64bit kernel / o32|n32|64 kexec-tools works
|
|
|
|
Fix the user-space kexec-tools, seems the tool only work for 32bit
|
|
machine. So, we need to add 64bit support for it. The address of the
|
|
entry point(kexec_start_address) is wrong and make the "kexec -e" fail.
|
|
the real entry point must be read from the new kernel image by the
|
|
user-space kexec-tools, otherwise, it will not work. The above 64bit
|
|
support tested is 64bit kernel with o32 user-space kexec-tools. The root
|
|
cause may be the different definition of virt_to_phys() and
|
|
phys_to_virt() in the kexec-tools and kernel space for 64bit system /
|
|
o32 kernel.
|
|
|
|
Ref: http://www.linux-mips.org/archives/linux-mips/2009-08/msg00149.html
|
|
|
|
2. Pass the arguments from kexec-tools to the new kernel image
|
|
|
|
Please refer to: "MIPS: Loongson: Kexec: Pass parameters to new kernel"
|
|
|
|
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
|
|
---
|
|
--- a/arch/mips/include/asm/kexec.h
|
|
+++ b/arch/mips/include/asm/kexec.h
|
|
@@ -36,6 +36,16 @@ static inline void crash_setup_regs(stru
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
+
|
|
+#define __kexec __attribute__((__section__(".__kexec.relocate")))
|
|
+
|
|
+/* The linker tells us where the relocate_new_kernel part is. */
|
|
+extern const unsigned char __start___kexec_relocate;
|
|
+extern const unsigned char __end___kexec_relocate;
|
|
+
|
|
+extern unsigned long kexec_start_address;
|
|
+extern unsigned long kexec_indirection_page;
|
|
+
|
|
struct kimage;
|
|
extern unsigned long kexec_args[4];
|
|
extern int (*_machine_kexec_prepare)(struct kimage *);
|
|
--- a/arch/mips/kernel/machine_kexec.c
|
|
+++ b/arch/mips/kernel/machine_kexec.c
|
|
@@ -13,12 +13,6 @@
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/page.h>
|
|
|
|
-extern const unsigned char relocate_new_kernel[];
|
|
-extern const size_t relocate_new_kernel_size;
|
|
-
|
|
-extern unsigned long kexec_start_address;
|
|
-extern unsigned long kexec_indirection_page;
|
|
-
|
|
int (*_machine_kexec_prepare)(struct kimage *) = NULL;
|
|
void (*_machine_kexec_shutdown)(void) = NULL;
|
|
void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
|
|
@@ -61,21 +55,34 @@ typedef void (*noretfun_t)(void) __attri
|
|
void
|
|
machine_kexec(struct kimage *image)
|
|
{
|
|
+ unsigned long kexec_relocate_size;
|
|
unsigned long reboot_code_buffer;
|
|
unsigned long entry;
|
|
unsigned long *ptr;
|
|
|
|
+ kexec_relocate_size = (unsigned long)(&__end___kexec_relocate) -
|
|
+ (unsigned long)(&__start___kexec_relocate);
|
|
+ pr_info("kexec_relocate_size = %lu\n", kexec_relocate_size);
|
|
+
|
|
reboot_code_buffer =
|
|
(unsigned long)page_address(image->control_code_page);
|
|
+ pr_info("reboot_code_buffer = %p\n", (void *)reboot_code_buffer);
|
|
|
|
kexec_start_address =
|
|
(unsigned long) phys_to_virt(image->start);
|
|
+ pr_info("kexec_start_address(entry point of new kernel) = %p\n",
|
|
+ (void *)kexec_start_address);
|
|
|
|
kexec_indirection_page =
|
|
(unsigned long) phys_to_virt(image->head & PAGE_MASK);
|
|
+ pr_info("kexec_indirection_page = %p\n",
|
|
+ (void *)kexec_indirection_page);
|
|
|
|
- memcpy((void*)reboot_code_buffer, relocate_new_kernel,
|
|
- relocate_new_kernel_size);
|
|
+ memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
|
|
+ kexec_relocate_size);
|
|
+
|
|
+ pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
|
|
+ &__start___kexec_relocate, (void *)reboot_code_buffer);
|
|
|
|
/*
|
|
* The generic kexec code builds a page list with physical
|
|
@@ -96,8 +103,8 @@ machine_kexec(struct kimage *image)
|
|
*/
|
|
local_irq_disable();
|
|
|
|
- printk("Will call new kernel at %08lx\n", image->start);
|
|
- printk("Bye ...\n");
|
|
+ pr_info("Will call new kernel at %p\n", (void *)kexec_start_address);
|
|
+ pr_info("Bye ...\n");
|
|
__flush_cache_all();
|
|
#ifdef CONFIG_SMP
|
|
/* All secondary cpus now may jump to kexec_wait cycle */
|
|
@@ -108,4 +115,3 @@ machine_kexec(struct kimage *image)
|
|
#endif
|
|
((noretfun_t) reboot_code_buffer)();
|
|
}
|
|
-
|
|
--- a/arch/mips/kernel/relocate_kernel.S
|
|
+++ b/arch/mips/kernel/relocate_kernel.S
|
|
@@ -14,6 +14,8 @@
|
|
#include <asm/stackframe.h>
|
|
#include <asm/addrspace.h>
|
|
|
|
+ .section .kexec.relocate, "ax"
|
|
+
|
|
LEAF(relocate_new_kernel)
|
|
PTR_L a0, arg0
|
|
PTR_L a1, arg1
|
|
@@ -155,9 +157,3 @@ EXPORT(kexec_start_address)
|
|
EXPORT(kexec_indirection_page)
|
|
PTR 0
|
|
.size kexec_indirection_page, PTRSIZE
|
|
-
|
|
-relocate_new_kernel_end:
|
|
-
|
|
-EXPORT(relocate_new_kernel_size)
|
|
- PTR relocate_new_kernel_end - relocate_new_kernel
|
|
- .size relocate_new_kernel_size, PTRSIZE
|
|
--- a/arch/mips/kernel/vmlinux.lds.S
|
|
+++ b/arch/mips/kernel/vmlinux.lds.S
|
|
@@ -50,6 +50,10 @@ SECTIONS
|
|
*(.text.*)
|
|
*(.fixup)
|
|
*(.gnu.warning)
|
|
+ __start___kexec_relocate = .;
|
|
+ KEEP(*(.kexec.relocate))
|
|
+ KEEP(*(.__kexec.relocate))
|
|
+ __end___kexec_relocate = .;
|
|
} :text = 0
|
|
_etext = .; /* End of text section */
|
|
|