diff options
Diffstat (limited to 'target/linux/generic/patches-3.3/331-mips-kexec-enhanche-the-support.patch')
| -rw-r--r-- | target/linux/generic/patches-3.3/331-mips-kexec-enhanche-the-support.patch | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.3/331-mips-kexec-enhanche-the-support.patch b/target/linux/generic/patches-3.3/331-mips-kexec-enhanche-the-support.patch new file mode 100644 index 0000000..5ffc2e29 --- /dev/null +++ b/target/linux/generic/patches-3.3/331-mips-kexec-enhanche-the-support.patch @@ -0,0 +1,159 @@ +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 */ + |