commit f511c1f11895397606be103823fd3a33c6e92811
author Ryan Salsamendi <rsalsamendi@hotmail.com> Fri Jun 16 13:15:31 2017 -0700
committer Martin Roth <martinroth@google.com> Tue Jun 20 03:13:18 2017 +0200
tree 6a7b16ed03e950fa04100f6a857f1488289bea36
parent 927f06a565dcbf973739e2c91cc1ea2814338609

arch/x86/ebda: Change memcpy() to endian wrappers

Change memcpy()s and memset()s to endian.h wrappers for consistency
and safety. Add zero_n() wrapper to safely clear memory.

Change-Id: If155d82608c81992f05eae4d2223de6f506e98c5
Signed-off-by: Ryan Salsamendi <rsalsamendi@hotmail.com>
Reviewed-on: https://review.coreboot.org/20240
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/arch/x86/ebda.c

diff --git a/src/arch/x86/ebda.c b/src/arch/x86/ebda.c
index b5dfb41..c828aa4f 100644
--- a/src/arch/x86/ebda.c
+++ b/src/arch/x86/ebda.c
@@ -19,6 +19,7 @@
 #include <arch/io.h>
 #include <arch/ebda.h>
 #include <arch/acpi.h>
+#include <commonlib/endian.h>
 
 void setup_ebda(u32 low_memory_size, u16 ebda_segment, u16 ebda_size)
 {
@@ -38,15 +39,15 @@
 	ebda = (void *)((uintptr_t)ebda_segment << 4);
 
 	/* clear BIOS DATA AREA */
-	memset(X86_BDA_BASE, 0, X86_BDA_SIZE);
+	zero_n(X86_BDA_BASE, X86_BDA_SIZE);
 
 	/* Avoid unaligned write16() since it's undefined behavior */
-	memcpy(X86_EBDA_LOWMEM, &low_memory_kb, sizeof(low_memory_kb));
-	memcpy(X86_EBDA_SEGMENT, &ebda_segment, sizeof(ebda_segment));
+	write_le16(X86_EBDA_LOWMEM, low_memory_kb);
+	write_le16(X86_EBDA_SEGMENT, ebda_segment);
 
 	/* Set up EBDA */
-	memset(ebda, 0, ebda_size);
-	memcpy(ebda, &ebda_kb, sizeof(ebda_kb));
+	zero_n(ebda, ebda_size);
+	write_le16(ebda, ebda_kb);
 }
 
 void setup_default_ebda(void)

src/commonlib/include/commonlib/endian.h

diff --git a/src/commonlib/include/commonlib/endian.h b/src/commonlib/include/commonlib/endian.h
index 1ec472f..7b08eee 100644
--- a/src/commonlib/include/commonlib/endian.h
+++ b/src/commonlib/include/commonlib/endian.h
@@ -18,6 +18,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <string.h>
 
 /* Endian agnostic functions working on single byte. */
 
@@ -254,4 +255,9 @@
 	write_le64(d, val);
 }
 
+static inline void zero_n(void *dest, size_t n)
+{
+	memset(dest, 0, n);
+}
+
 #endif