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>
diff --git a/src/acpi/gnvs.c b/src/acpi/gnvs.c
new file mode 100644
index 0000000..fbc84b3
--- /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();
+}