lynxpoint: Move ACPI NVS into separate CBMEM table

The ACPI NVS region was setup in place and there was a CBMEM
table that pointed to it.  In order to be able to use NVS
earlier the CBMEM region is allocated for NVS itself during
the LPC device init and the ACPI tables point to it in CBMEM.

The current cbmem region is renamed to ACPI_GNVS_PTR to
indicate that it is really a pointer to the GNVS and does
not actually contain the GNVS.

Change-Id: I31ace432411c7f825d86ca75c63dd79cd658e891
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/2970
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 13 insertions, 7 deletions

diff --git a/src/mainboard/intel/wtm2/acpi_tables.c b/src/mainboard/intel/wtm2/acpi_tables.c
index 6f5a1ddb77..16a1c6a9ed 100644
--- a/src/mainboard/intel/wtm2/acpi_tables.c
+++ b/src/mainboard/intel/wtm2/acpi_tables.c
@@ -70,7 +70,6 @@ static void acpi_update_thermal_table(global_nvs_t *gnvs)
 
 static void acpi_create_gnvs(global_nvs_t *gnvs)
 {
-	memset((void *)gnvs, 0, sizeof(*gnvs));
 	gnvs->apic = 1;
 	gnvs->mpen = 1; /* Enable Multi Processing */
 	gnvs->pcnt = dev_count_cpu();
@@ -162,6 +161,7 @@ unsigned long write_acpi_tables(unsigned long start)
 #endif
 	acpi_header_t *ssdt;
 	acpi_header_t *dsdt;
+	global_nvs_t *gnvs;
 
 	current = start;
 
@@ -237,22 +237,28 @@ unsigned long write_acpi_tables(unsigned long start)
 	ALIGN_CURRENT;
 	acpi_add_table(rsdp, mcfg);
 
-	/* Pack GNVS into the ACPI table area */
+	/* Update GNVS pointer into CBMEM */
+	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
+	if (!gnvs) {
+		printk(BIOS_DEBUG, "ACPI: Could not find CBMEM GNVS\n");
+		gnvs = (global_nvs_t *)current;
+	}
+
 	for (i=0; i < dsdt->length; i++) {
 		if (*(u32*)(((u32)dsdt) + i) == 0xC0DEBABE) {
 			printk(BIOS_DEBUG, "ACPI: Patching up global NVS in "
-			     "DSDT at offset 0x%04x -> 0x%08lx\n", i, current);
-			*(u32*)(((u32)dsdt) + i) = current; // 0x92 bytes
-			acpi_save_gnvs(current);
+			       "DSDT at offset 0x%04x -> %p\n", i, gnvs);
+			*(u32*)(((u32)dsdt) + i) = (unsigned long)gnvs;
+			acpi_save_gnvs((unsigned long)gnvs);
 			break;
 		}
 	}
 
 	/* And fill it */
-	acpi_create_gnvs((global_nvs_t *)current);
+	acpi_create_gnvs(gnvs);
 
 	/* And tell SMI about it */
-	smm_setup_structures((void *)current, NULL, NULL);
+	smm_setup_structures(gnvs, NULL, NULL);
 
 	current += sizeof(global_nvs_t);
 	ALIGN_CURRENT;