arch/x86: Add postcar_frame_common_mtrrs()

As most platforms will share the subset of enabling
both low RAM WB and high ROM WP MTRRs, provide them
with a single function.

Add possibility for the platform to skip these if
required.

Change-Id: Id1f8b7682035e654231f6133a42909a36e3e15a1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34809
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/x86/include/arch/cpu.h

@@ -302,6 +302,7 @@ struct postcar_frame {
 	uint32_t upper_mask;
 	int max_var_mtrrs;
 	int num_var_mtrrs;
+	int skip_common_mtrr;
 };
 
 /*
@@ -322,6 +323,11 @@ void postcar_frame_add_mtrr(struct postcar_frame *pcf,
  */
 void postcar_frame_add_romcache(struct postcar_frame *pcf, int type);
 
+/*
+ * Add a common MTRR setup most platforms will have as a subset.
+ */
+void postcar_frame_common_mtrrs(struct postcar_frame *pcf);
+
 /*
  * Push used MTRR and Max MTRRs on to the stack
  * and return pointer to stack top.

src/arch/x86/postcar_loader.c

@@ -120,6 +120,18 @@ void postcar_frame_add_romcache(struct postcar_frame *pcf, int type)
 	postcar_frame_add_mtrr(pcf, CACHE_ROM_BASE, CACHE_ROM_SIZE, type);
 }
 
+void postcar_frame_common_mtrrs(struct postcar_frame *pcf)
+{
+	if (pcf->skip_common_mtrr)
+		return;
+
+	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
+	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
+
+	/* Cache the ROM as WP just below 4GiB. */
+	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
+}
+
 void *postcar_commit_mtrrs(struct postcar_frame *pcf)
 {
 	/*

src/cpu/intel/car/romstage.c

@@ -33,6 +33,8 @@ static void prepare_and_run_postcar(struct postcar_frame *pcf)
 
 	fill_postcar_frame(pcf);
 
+	postcar_frame_common_mtrrs(pcf);
+
 	run_postcar_phase(pcf);
 	/* We do not return here. */
 }

src/drivers/intel/fsp1_1/car.c

@@ -28,13 +28,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_mtrr(pcf, CACHE_ROM_BASE, CACHE_ROM_SIZE,
-			       MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache at least 8 MiB below the top of ram, and at most 8 MiB
 	 * above top of the ram. This satisfies MTRR alignment requirement
 	 * with different TSEG size configurations. */

src/northbridge/intel/e7505/memmap.c

@@ -54,6 +54,8 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 	 * operations when source is left as UC.
 	 */
 
+	pcf->skip_common_mtrr = 1;
+
 	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
 	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
 

src/northbridge/intel/gm45/memmap.c

@@ -138,13 +138,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache 8 MiB region below the top of ram and 2 MiB above top of
 	 * ram to cover both cbmem as the TSEG region.
 	 */

src/northbridge/intel/haswell/memmap.c

@@ -57,12 +57,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache at least 8 MiB below the top of ram, and at most 8 MiB
 	 * above top of the ram. This satisfies MTRR alignment requirement
 	 * with different TSEG size configurations.

src/northbridge/intel/i440bx/memmap.c

@@ -72,13 +72,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache CBMEM region as WB. */
 	top_of_ram = (uintptr_t)cbmem_top();
 	postcar_frame_add_mtrr(pcf, top_of_ram - 8*MiB, 8*MiB,

src/northbridge/intel/i945/memmap.c

@@ -104,13 +104,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache 8 MiB region below the top of ram and 2 MiB above top of
 	 * ram to cover both cbmem as the TSEG region.
 	 */

src/northbridge/intel/nehalem/memmap.c

@@ -62,13 +62,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache at least 8 MiB below the top of ram, and at most 8 MiB
 	 * above top of the ram. This satisfies MTRR alignment requirement
 	 * with different TSEG size configurations.

src/northbridge/intel/pineview/memmap.c

@@ -154,13 +154,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache 8 MiB region below the top of ram and 2 MiB above top of
 	 * ram to cover both cbmem as the TSEG region.
 	 */

src/northbridge/intel/sandybridge/memmap.c

@@ -61,13 +61,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	top_of_ram = (uintptr_t)cbmem_top();
 	/* Cache 8MiB below the top of ram. On sandybridge systems the top of
 	 * ram under 4GiB is the start of the TSEG region. It is required to

src/northbridge/intel/x4x/memmap.c

@@ -149,13 +149,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache 8 MiB region below the top of ram and 2 MiB above top of
 	 * ram to cover both cbmem as the TSEG region.
 	 */

src/soc/intel/baytrail/romstage/romstage.c

@@ -62,6 +62,8 @@ static void prepare_and_run_postcar(struct postcar_frame *pcf)
 
 	fill_postcar_frame(pcf);
 
+	postcar_frame_common_mtrrs(pcf);
+
 	run_postcar_phase(pcf);
 	/* We do not return here. */
 }
@@ -256,12 +258,6 @@ static void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache at least 8 MiB below the top of ram, and at most 8 MiB
 	 * above top of the ram. This satisfies MTRR alignment requirement
 	 * with different TSEG size configurations.

src/soc/intel/broadwell/romstage/romstage.c

@@ -39,12 +39,6 @@ void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;
 
-	/* Cache the ROM as WP just below 4GiB. */
-	postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
-
-	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
-	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
-
 	/* Cache at least 8 MiB below the top of ram, and at most 8 MiB
 	 * above top of the ram. This satisfies MTRR alignment requirement
 	 * with different TSEG size configurations.