1 files changed, 38 insertions, 0 deletions

diff --git a/arch/x86/include/asm/bootparam_utils.h b/arch/x86/include/asm/bootparam_utils.h
new file mode 100644
index 000000000000..5b5e9cb774b5
--- /dev/null
+++ b/arch/x86/include/asm/bootparam_utils.h
@@ -0,0 +1,38 @@
+#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.
+ *
+ */
+static void sanitize_boot_params(struct boot_params *boot_params)
+{
+        if (boot_params->sentinel) {
+                /*fields in boot_params are not valid, clear them */
+                memset(&boot_params->olpc_ofw_header, 0,
+                       (char *)&boot_params->alt_mem_k -
+                        (char *)&boot_params->olpc_ofw_header);
+                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 */