diff options
Diffstat (limited to 'kexec/arch/i386/x86-linux-setup.c')
| -rw-r--r-- | kexec/arch/i386/x86-linux-setup.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kexec/arch/i386/x86-linux-setup.c b/kexec/arch/i386/x86-linux-setup.c index f843ca4..50b32be 100644 --- a/kexec/arch/i386/x86-linux-setup.c +++ b/kexec/arch/i386/x86-linux-setup.c @@ -20,6 +20,7 @@ #include <string.h> #include <stdarg.h> #include <stdlib.h> +#include <stddef.h> #include <errno.h> #include <limits.h> #include <sys/types.h> @@ -396,12 +397,32 @@ out: real_mode->eddbuf_entries); } +#define BOOT_PARAMS_DBGFS "/sys/kernel/debug/boot_params/data" + +void setup_subarch(struct x86_linux_param_header *real_mode) +{ + int data_file; + const off_t offset = offsetof(typeof(*real_mode), hardware_subarch); + + data_file = open(BOOT_PARAMS_DBGFS, O_RDONLY); + if (data_file < 0) + return; + if (lseek(data_file, offset, SEEK_SET) < 0) + goto close; + read(data_file, &real_mode->hardware_subarch, sizeof(uint32_t)); +close: + close(data_file); +} + void setup_linux_system_parameters(struct x86_linux_param_header *real_mode, unsigned long kexec_flags) { /* Fill in information the BIOS would usually provide */ struct memory_range *range; int i, ranges; + + /* get subarch from running kernel */ + setup_subarch(real_mode); /* Default screen size */ real_mode->orig_x = 0; |