ACPI: Add framework for GNVS initialisation

Provide common initialisation point for setting up
GNVS structure before first SMI is triggered.

Change-Id: Iccad533c3824d70f6cbae52cc8dd79f142ece944
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42423
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 69 insertions, 0 deletions

diff --git a/src/acpi/gnvs.c b/src/acpi/gnvs.c
new file mode 100644
index 0000000000..fbc84b36fd
--- /dev/null
+++ b/src/acpi/gnvs.c
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi_gnvs.h>
+#include <acpi/acpigen.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <string.h>
+#include <types.h>
+
+static void *gnvs;
+
+void *acpi_get_gnvs(void)
+{
+	if (gnvs)
+		return gnvs;
+
+	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
+	if (gnvs)
+		return gnvs;
+
+	printk(BIOS_ERR, "Unable to locate Global NVS\n");
+	return NULL;
+}
+
+static void gnvs_assign_cbmc(void)
+{
+	uint32_t *gnvs_cbmc = gnvs_cbmc_ptr();
+	if (gnvs_cbmc)
+		*gnvs_cbmc = (uintptr_t)cbmem_find(CBMEM_ID_CONSOLE);
+}
+
+void *gnvs_get_or_create(void)
+{
+	size_t gnvs_size;
+
+	if (gnvs)
+		return gnvs;
+
+	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
+	if (gnvs)
+		return gnvs;
+
+	gnvs_size = gnvs_size_of_array();
+
+	gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, gnvs_size);
+	if (!gnvs)
+		return gnvs;
+
+	memset(gnvs, 0, gnvs_size);
+
+	if (CONFIG(CONSOLE_CBMEM))
+		gnvs_assign_cbmc();
+
+	if (CONFIG(CHROMEOS))
+		gnvs_assign_chromeos();
+
+	return gnvs;
+}
+
+void acpi_inject_nvsa(void)
+{
+	uintptr_t gnvs_address = (uintptr_t)acpi_get_gnvs();
+	if (!gnvs_address)
+		return;
+
+	acpigen_write_scope("\\");
+	acpigen_write_name_dword("NVSA", gnvs_address);
+	acpigen_pop_len();
+}