diff options
Diffstat (limited to 'arch/arm/kernel/setup.c')
| -rw-r--r-- | arch/arm/kernel/setup.c | 51 |
1 files changed, 47 insertions, 4 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 4de432ec903..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> @@ -304,10 +305,23 @@ int cpu_architecture(void) cpu_arch = (processor_id >> 16) & 7; if (cpu_arch) cpu_arch += CPU_ARCH_ARMv3; - } else { - /* the revised CPUID */ - cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6; - } + } else if ((processor_id & 0x000f0000) == 0x000f0000) { + unsigned int mmfr0; + + /* Revised CPUID format. Read the Memory Model Feature + * Register 0 and check for VMSAv7 or PMSAv7 */ + asm("mrc p15, 0, %0, c0, c1, 4" + : "=r" (mmfr0)); + if ((mmfr0 & 0x0000000f) == 0x00000003 || + (mmfr0 & 0x000000f0) == 0x00000030) + cpu_arch = CPU_ARCH_ARMv7; + else if ((mmfr0 & 0x0000000f) == 0x00000002 || + (mmfr0 & 0x000000f0) == 0x00000020) + cpu_arch = CPU_ARCH_ARMv6; + else + cpu_arch = CPU_ARCH_UNKNOWN; + } else + cpu_arch = CPU_ARCH_UNKNOWN; return cpu_arch; } @@ -770,6 +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; @@ -788,6 +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. |