| H. Peter Anvin | 5dcd14e | 2013-01-29 01:05:24 -0800 | [diff] [blame] | 1 | #ifndef _ASM_X86_BOOTPARAM_UTILS_H |
| 2 | #define _ASM_X86_BOOTPARAM_UTILS_H |
| 3 | |
| 4 | #include <asm/bootparam.h> |
| 5 | |
| 6 | /* |
| 7 | * This file is included from multiple environments. Do not |
| 8 | * add completing #includes to make it standalone. |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * Deal with bootloaders which fail to initialize unknown fields in |
| 13 | * boot_params to zero. The list fields in this list are taken from |
| 14 | * analysis of kexec-tools; if other broken bootloaders initialize a |
| 15 | * different set of fields we will need to figure out how to disambiguate. |
| 16 | * |
| 17 | */ |
| 18 | static void sanitize_boot_params(struct boot_params *boot_params) |
| 19 | { |
| 20 | if (boot_params->sentinel) { |
| 21 | /*fields in boot_params are not valid, clear them */ |
| 22 | memset(&boot_params->olpc_ofw_header, 0, |
| 23 | (char *)&boot_params->alt_mem_k - |
| 24 | (char *)&boot_params->olpc_ofw_header); |
| 25 | memset(&boot_params->kbd_status, 0, |
| 26 | (char *)&boot_params->hdr - |
| 27 | (char *)&boot_params->kbd_status); |
| 28 | memset(&boot_params->_pad7[0], 0, |
| 29 | (char *)&boot_params->edd_mbr_sig_buffer[0] - |
| 30 | (char *)&boot_params->_pad7[0]); |
| 31 | memset(&boot_params->_pad8[0], 0, |
| 32 | (char *)&boot_params->eddbuf[0] - |
| 33 | (char *)&boot_params->_pad8[0]); |
| 34 | memset(&boot_params->_pad9[0], 0, sizeof(boot_params->_pad9)); |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | #endif /* _ASM_X86_BOOTPARAM_UTILS_H */ |