soc/amd: Move root complex SSDT TOM1/TOM2 generation function
This will also be used for cezanne. Stoney also has a similar function,
but it hard codes the scope path. I didn't have a device setup to test
if switching to this function was a no-op. So I left it.
TOM2 isn't used by any ASL, so we could remove it later.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I7c8f476a7735fea61a3244b97988e3ead3b42e79
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50892
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/soc/amd/common/block/acpi/tables.c b/src/soc/amd/common/block/acpi/tables.c
index 88ff252..8bad755 100644
--- a/src/soc/amd/common/block/acpi/tables.c
+++ b/src/soc/amd/common/block/acpi/tables.c
@@ -1,8 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi.h>
+#include <acpi/acpigen.h>
#include <amdblocks/acpi.h>
#include <amdblocks/chip.h>
+#include <assert.h>
+#include <cpu/amd/msr.h>
+#include <cpu/amd/mtrr.h>
#include <device/device.h>
#include <types.h>
@@ -45,3 +49,30 @@
return current;
}
+
+/* Used by \_SB.PCI0._CRS */
+void acpi_fill_root_complex_tom(const struct device *device)
+{
+ msr_t msr;
+ const char *scope;
+
+ assert(device);
+
+ scope = acpi_device_scope(device);
+ assert(scope);
+ acpigen_write_scope(scope);
+
+ msr = rdmsr(TOP_MEM);
+ acpigen_write_name_dword("TOM1", msr.lo);
+ msr = rdmsr(TOP_MEM2);
+ /*
+ * Since XP only implements parts of ACPI 2.0, we can't use a qword
+ * here.
+ * See http://www.acpi.info/presentations/S01USMOBS169_OS%2520new.ppt
+ * slide 22ff.
+ * Shift value right by 20 bit to make it fit into 32bit,
+ * giving us 1MB granularity and a limit of almost 4Exabyte of memory.
+ */
+ acpigen_write_name_dword("TOM2", (msr.hi << 12) | msr.lo >> 20);
+ acpigen_pop_len();
+}