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-rw-r--r--arch/x86/cpu/mtrr.c12
-rw-r--r--arch/x86/include/asm/mtrr.h5
-rw-r--r--arch/x86/lib/init_helpers.c4
3 files changed, 19 insertions, 2 deletions
diff --git a/arch/x86/cpu/mtrr.c b/arch/x86/cpu/mtrr.c
index ac8765f..5d36b3e 100644
--- a/arch/x86/cpu/mtrr.c
+++ b/arch/x86/cpu/mtrr.c
@@ -22,6 +22,9 @@ DECLARE_GLOBAL_DATA_PTR;
/* Prepare to adjust MTRRs */
void mtrr_open(struct mtrr_state *state)
{
+ if (!gd->arch.has_mtrr)
+ return;
+
state->enable_cache = dcache_status();
if (state->enable_cache)
@@ -33,6 +36,9 @@ void mtrr_open(struct mtrr_state *state)
/* Clean up after adjusting MTRRs, and enable them */
void mtrr_close(struct mtrr_state *state)
{
+ if (!gd->arch.has_mtrr)
+ return;
+
wrmsrl(MTRR_DEF_TYPE_MSR, state->deftype | MTRR_DEF_TYPE_EN);
if (state->enable_cache)
enable_caches();
@@ -45,6 +51,9 @@ int mtrr_commit(bool do_caches)
uint64_t mask;
int i;
+ if (!gd->arch.has_mtrr)
+ return -ENOSYS;
+
mtrr_open(&state);
for (i = 0; i < gd->arch.mtrr_req_count; i++, req++) {
mask = ~(req->size - 1);
@@ -66,6 +75,9 @@ int mtrr_add_request(int type, uint64_t start, uint64_t size)
struct mtrr_request *req;
uint64_t mask;
+ if (!gd->arch.has_mtrr)
+ return -ENOSYS;
+
if (gd->arch.mtrr_req_count == MAX_MTRR_REQUESTS)
return -ENOSPC;
req = &gd->arch.mtrr_req[gd->arch.mtrr_req_count++];
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index 3c11740..fda4eae 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -65,7 +65,6 @@ void mtrr_open(struct mtrr_state *state);
*
* @state: Structure from mtrr_open()
*/
-/* */
void mtrr_close(struct mtrr_state *state);
/**
@@ -76,6 +75,8 @@ void mtrr_close(struct mtrr_state *state);
* @type: Requested type (MTRR_TYPE_)
* @start: Start address
* @size: Size
+ *
+ * @return: 0 on success, non-zero on failure
*/
int mtrr_add_request(int type, uint64_t start, uint64_t size);
@@ -86,6 +87,8 @@ int mtrr_add_request(int type, uint64_t start, uint64_t size);
* It must be called with caches disabled.
*
* @do_caches: true if caches are currently on
+ *
+ * @return: 0 on success, non-zero on failure
*/
int mtrr_commit(bool do_caches);
diff --git a/arch/x86/lib/init_helpers.c b/arch/x86/lib/init_helpers.c
index fc211d9..5097ca2 100644
--- a/arch/x86/lib/init_helpers.c
+++ b/arch/x86/lib/init_helpers.c
@@ -7,6 +7,7 @@
#include <common.h>
#include <fdtdec.h>
#include <spi.h>
+#include <asm/errno.h>
#include <asm/mtrr.h>
#include <asm/sections.h>
@@ -71,7 +72,8 @@ int init_cache_f_r(void)
int ret;
ret = mtrr_commit(false);
- if (ret)
+ /* If MTRR MSR is not implemented by the processor, just ignore it */
+ if (ret && ret != -ENOSYS)
return ret;
#endif
/* Initialise the CPU cache(s) */