diff options
| -rw-r--r-- | arch/arm/kernel/relocate_kernel.S | 29 | ||||
| -rw-r--r-- | arch/arm/kernel/setup.c | 30 | ||||
| -rw-r--r-- | include/asm-arm/kexec.h | 2 |
3 files changed, 60 insertions, 1 deletions
diff --git a/arch/arm/kernel/relocate_kernel.S b/arch/arm/kernel/relocate_kernel.S index 7baadae7cb2..062c111c572 100644 --- a/arch/arm/kernel/relocate_kernel.S +++ b/arch/arm/kernel/relocate_kernel.S @@ -7,6 +7,23 @@ .globl relocate_new_kernel relocate_new_kernel: + /* Move boot params back to where the kernel expects them */ + + ldr r0,kexec_boot_params_address + teq r0,#0 + beq 8f + + ldr r1,kexec_boot_params_copy + mov r6,#KEXEC_BOOT_PARAMS_SIZE/4 +7: + ldr r5,[r1],#4 + str r5,[r0],#4 + subs r6,r6,#1 + bne 7b + +8: + /* Boot params moved, now go on with the kernel */ + ldr r0,kexec_indirection_page ldr r1,kexec_start_address @@ -50,7 +67,7 @@ relocate_new_kernel: mov lr,r1 mov r0,#0 ldr r1,kexec_mach_type - mov r2,#0 + ldr r2,kexec_boot_params_address mov pc,lr .globl kexec_start_address @@ -65,6 +82,16 @@ kexec_indirection_page: kexec_mach_type: .long 0x0 + /* phy addr where new kernel will expect to find boot params */ + .globl kexec_boot_params_address +kexec_boot_params_address: + .long 0x0 + + /* phy addr where old kernel put a copy of orig boot params */ + .globl kexec_boot_params_copy +kexec_boot_params_copy: + .long 0x0 + relocate_new_kernel_end: .globl relocate_new_kernel_size diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index efac7df72d6..bf56eb337df 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -24,6 +24,7 @@ #include <linux/interrupt.h> #include <linux/smp.h> #include <linux/fs.h> +#include <linux/kexec.h> #include <asm/cpu.h> #include <asm/elf.h> @@ -783,6 +784,23 @@ static int __init customize_machine(void) } arch_initcall(customize_machine); +#ifdef CONFIG_KEXEC + +/* Physical addr of where the boot params should be for this machine */ +extern unsigned long kexec_boot_params_address; + +/* Physical addr of the buffer into which the boot params are copied */ +extern unsigned long kexec_boot_params_copy; + +/* Pointer to the boot params buffer, for manipulation and display */ +unsigned long kexec_boot_params; +EXPORT_SYMBOL(kexec_boot_params); + +/* The buffer itself - make sure it is sized correctly */ +static unsigned long kexec_boot_params_buf[(KEXEC_BOOT_PARAMS_SIZE + 3) / 4]; + +#endif + void __init setup_arch(char **cmdline_p) { struct tag *tags = (struct tag *)&init_tags; @@ -801,6 +819,18 @@ void __init setup_arch(char **cmdline_p) else if (mdesc->boot_params) tags = phys_to_virt(mdesc->boot_params); +#ifdef CONFIG_KEXEC + kexec_boot_params_copy = virt_to_phys(kexec_boot_params_buf); + kexec_boot_params = (unsigned long)kexec_boot_params_buf; + if (__atags_pointer) { + kexec_boot_params_address = __atags_pointer; + memcpy((void *)kexec_boot_params, tags, KEXEC_BOOT_PARAMS_SIZE); + } else if (mdesc->boot_params) { + kexec_boot_params_address = mdesc->boot_params; + memcpy((void *)kexec_boot_params, tags, KEXEC_BOOT_PARAMS_SIZE); + } +#endif + /* * If we have the old style parameters, convert them to * a tag list. diff --git a/include/asm-arm/kexec.h b/include/asm-arm/kexec.h index b5b030ef633..46dcc4d0b9b 100644 --- a/include/asm-arm/kexec.h +++ b/include/asm-arm/kexec.h @@ -14,6 +14,8 @@ #define KEXEC_ARCH KEXEC_ARCH_ARM +#define KEXEC_BOOT_PARAMS_SIZE 1536 + #ifndef __ASSEMBLY__ struct kimage; |