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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>
This commit is contained in:
Ryan Salsamendi 2017-06-16 13:15:31 -07:00 committed by Martin Roth
parent 927f06a565
commit f511c1f118
2 changed files with 12 additions and 5 deletions
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11
src/arch/x86/ebda.c
View File

@ -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 @@ void setup_ebda(u32 low_memory_size, u16 ebda_segment, u16 ebda_size)
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)

6
src/commonlib/include/commonlib/endian.h
View File

@ -18,6 +18,7 @@
#include <stddef.h>
#include <stdint.h>
#include <string.h>
/* Endian agnostic functions working on single byte. */
@ -254,4 +255,9 @@ static inline void write_at_le64(void *dest, uint64_t val, size_t offset)
write_le64(d, val);
}
static inline void zero_n(void *dest, size_t n)
{
memset(dest, 0, n);
}
#endif