[S] Change in coreboot[master]: soc/amd/common/cpu/noncar/early_cache: use get_top_of_mem_below_4gb

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Matt DeVillier, Fred Reitberger.

Felix Held has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/74615 )

Change subject: soc/amd/common/cpu/noncar/early_cache: use get_top_of_mem_below_4gb
......................................................................

soc/amd/common/cpu/noncar/early_cache: use get_top_of_mem_below_4gb

Use get_top_of_mem_below_4gb instead of open-coding the functionality.

Signed-off-by: Felix Held 
Change-Id: Icc9e5ad8954c6203fc4762aa976bba7e8ea16159
---
M src/soc/amd/common/block/cpu/noncar/early_cache.c
1 file changed, 14 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/15/74615/1

diff --git a/src/soc/amd/common/block/cpu/noncar/early_cache.c b/src/soc/amd/common/block/cpu/noncar/early_cache.c
index 4bba172..2ff8760 100644
--- a/src/soc/amd/common/block/cpu/noncar/early_cache.c
+++ b/src/soc/amd/common/block/cpu/noncar/early_cache.c
@@ -20,7 +20,6 @@
  */
 void early_cache_setup(void)
 {
-	msr_t top_mem;
    msr_t sys_cfg;
    msr_t mtrr_def_type;
    msr_t fixed_mtrr_ram;
@@ -34,7 +33,6 @@

var_mtrr_context_init(&mtrr_ctx.ctx);
    mtrr_ctx.ctx.max_var_mtrrs = MIN(MAX_VAR_MTRR_USE, mtrr_ctx.ctx.max_var_mtrrs);
-	top_mem = rdmsr(TOP_MEM);
    /* Enable RdDram and WrDram attributes in fixed MTRRs. */
    sys_cfg = rdmsr(SYSCFG_MSR);
    sys_cfg.lo |= SYSCFG_MSR_MtrrFixDramModEn;
@@ -61,7 +59,8 @@

wrmsr(SYSCFG_MSR, sys_cfg);

-	var_mtrr_set(&mtrr_ctx.ctx, 0, ALIGN_DOWN(top_mem.lo, 8 * MiB), MTRR_TYPE_WRBACK);
+	var_mtrr_set(&mtrr_ctx.ctx, 0, ALIGN_DOWN(get_top_of_mem_below_4gb(), 8 * MiB),
+		     MTRR_TYPE_WRBACK);
    /* Always mark the 16 MByte right below the 4 GB boundary as WRPROT */
    var_mtrr_set(&mtrr_ctx.ctx, FLASH_BELOW_4GB_MAPPING_REGION_BASE,
    	     FLASH_BELOW_4GB_MAPPING_REGION_SIZE, MTRR_TYPE_WRPROT);