soc/amd/stoneyridge: Enable early cbmem
Add a memmap file with a cbmem_top() function. Remove the
LATE_CBMEM_INIT, allowing the default of EARLY. Remove calls
to the late-only set_top_of_ram() function.
Change-Id: I11ad7190031c912642a7312f2fc6f792866288b7
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/19751
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/soc/amd/stoneyridge/ramtop.c b/src/soc/amd/stoneyridge/ramtop.c
index 8fa81c7..c81e73b4 100644
--- a/src/soc/amd/stoneyridge/ramtop.c
+++ b/src/soc/amd/stoneyridge/ramtop.c
@@ -15,6 +15,8 @@
#include <stdint.h>
#include <arch/io.h>
+#include <cpu/x86/msr.h>
+#include <cpu/amd/mtrr.h>
#include <cbmem.h>
#define CBMEM_TOP_SCRATCHPAD 0x78
@@ -31,3 +33,13 @@
top_cache = pci_read_config16(PCI_DEV(0,0,0), CBMEM_TOP_SCRATCHPAD);
return (top_cache << 16);
}
+
+void *cbmem_top(void)
+{
+ msr_t tom = rdmsr(TOP_MEM);
+
+ if (!tom.lo)
+ return 0;
+ else
+ return (void *)restore_top_of_low_cacheable();
+}