[S] Change in coreboot[master]: soc/amd/stoneyridge/northbridge: use get_top_of_mem_[below,above]_4gb

[Felix Held (Code Review)]

Attention is currently required from: Matt DeVillier.

Felix Held has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/74613 )

Change subject: soc/amd/stoneyridge/northbridge: use get_top_of_mem_[below,above]_4gb
......................................................................

soc/amd/stoneyridge/northbridge: use get_top_of_mem_[below,above]_4gb

Use get_top_of_mem_below_4gb and get_top_of_mem_above_4g instead of
open-coding the functionality.

Signed-off-by: Felix Held 
Change-Id: I04f2a3744aee9beedaa97b154a652ce6f0c705c0
---
M src/soc/amd/stoneyridge/northbridge.c
1 file changed, 18 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/13/74613/1

diff --git a/src/soc/amd/stoneyridge/northbridge.c b/src/soc/amd/stoneyridge/northbridge.c
index 7ddfc41..23395d3 100644
--- a/src/soc/amd/stoneyridge/northbridge.c
+++ b/src/soc/amd/stoneyridge/northbridge.c
@@ -327,8 +327,8 @@
    uint64_t uma_base = get_uma_base();
    uint32_t uma_size = get_uma_size();
    uint32_t mem_useable = (uintptr_t)cbmem_top();
-	msr_t tom = rdmsr(TOP_MEM);
-	msr_t high_tom = rdmsr(TOP_MEM2);
+	uint32_t tom = get_top_of_mem_below_4gb();
+	uint64_t high_tom = get_top_of_mem_above_4g();
    uint64_t high_mem_useable;
    int idx = 0x10;

@@ -352,16 +352,15 @@

/* Low top usable RAM -> Low top RAM (bottom pci mmio hole) */
    reserved_ram_resource_kb(dev, idx++, mem_useable / KiB,
-					(tom.lo - mem_useable) / KiB);
+					(tom - mem_useable) / KiB);

/* If there is memory above 4GiB */
-	if (high_tom.hi) {
+	if (high_tom >> 32) {
    	/* 4GiB -> high top usable */
    	if (uma_base >= (4ull * GiB))
    		high_mem_useable = uma_base;
    	else
-			high_mem_useable = ((uint64_t)high_tom.lo |
-						((uint64_t)high_tom.hi << 32));
+			high_mem_useable = high_tom;

ram_resource_kb(dev, idx++, (4ull * GiB) / KiB,
    			((high_mem_useable - (4ull * GiB)) / KiB));