#ifndef _ASM_X86_BOOTPARAM_UTILS_H#define _ASM_X86_BOOTPARAM_UTILS_H #include <asm/bootparam.h> /* * This file is included from multiple environments.  Do not * add completing #includes to make it standalone. */ /* * Deal with bootloaders which fail to initialize unknown fields in * boot_params to zero.  The list fields in this list are taken from * analysis of kexec-tools; if other broken bootloaders initialize a * different set of fields we will need to figure out how to disambiguate. * * Note: efi_info is commonly left uninitialized, but that field has a * private magic, so it is better to leave it unchanged. */static void sanitize_boot_params(struct boot_params *boot_params){	/* 	 * IMPORTANT NOTE TO BOOTLOADER AUTHORS: do not simply clear	 * this field.  The purpose of this field is to guarantee	 * compliance with the x86 boot spec located in	 * Documentation/x86/boot.txt .  That spec says that the	 * *whole* structure should be cleared, after which only the	 * portion defined by struct setup_header (boot_params->hdr)	 * should be copied in.	 *	 * If you're having an issue because the sentinel is set, you	 * need to change the whole structure to be cleared, not this	 * (or any other) individual field, or you will soon have	 * problems again.	 */	if (boot_params->sentinel) {		/* fields in boot_params are left uninitialized, clear them */		memset(&boot_params->ext_ramdisk_image, 0,		       (char *)&boot_params->efi_info -			(char *)&boot_params->ext_ramdisk_image);		memset(&boot_params->kbd_status, 0,		       (char *)&boot_params->hdr -		       (char *)&boot_params->kbd_status);		memset(&boot_params->_pad7[0], 0,		       (char *)&boot_params->edd_mbr_sig_buffer[0] -			(char *)&boot_params->_pad7[0]);		memset(&boot_params->_pad8[0], 0,		       (char *)&boot_params->eddbuf[0] -			(char *)&boot_params->_pad8[0]);		memset(&boot_params->_pad9[0], 0, sizeof(boot_params->_pad9));	}} #endif /* _ASM_X86_BOOTPARAM_UTILS_H */