ramoops: Add support for passing ramoops region through cb tables.

CQ-DEPEND=CL:228856
BUG=chrome-os-partner:33676
BRANCH=None
TEST=ramoops buffer verified on ryu.

Original-Change-Id: I29584f89ded0c22c4f255a40951a179b54761053
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/228744
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>

(cherry picked from commit e8b2c8b75c51160df177edc14c90e5bd3836e931)
Signed-off-by: Aaron Durbin <adurbin@chromium.org>

Change-Id: I5fdeb59056945a602584584edce9c782151ca8ea
Reviewed-on: http://review.coreboot.org/9442
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/include/boot/coreboot_tables.h

@@ -227,6 +227,7 @@ struct lb_gpios {
 #define LB_TAG_VBNV		0x0019
 #define LB_TAB_VBOOT_HANDOFF	0x0020
 #define LB_TAB_DMA		0x0022
+#define LB_TAG_RAM_OOPS		0x0023
 struct lb_range {
 	uint32_t tag;
 	uint32_t size;
@@ -235,6 +236,8 @@ struct lb_range {
 	uint32_t range_size;
 };
 
+void lb_ramoops(struct lb_header *header);
+
 #define LB_TAG_TIMESTAMPS	0x0016
 #define LB_TAG_CBMEM_CONSOLE	0x0017
 #define LB_TAG_MRC_CACHE	0x0018

src/lib/coreboot_table.c

@@ -473,6 +473,10 @@ unsigned long write_coreboot_table(
 	/* Add board-specific table entries, if any. */
 	lb_board(head);
 
+#if IS_ENABLED(CONFIG_CHROMEOS_RAMOOPS)
+	lb_ramoops(head);
+#endif
+
 	/* Remember where my valid memory ranges are */
 	return lb_table_fini(head);
 }

src/vendorcode/google/chromeos/Kconfig

@@ -76,6 +76,11 @@ config CHROMEOS_RAMOOPS_DYNAMIC
 	default n
 	depends on CHROMEOS_RAMOOPS && HAVE_ACPI_TABLES
 
+config CHROMEOS_RAMOOPS_NON_ACPI
+	bool "Allocate RAM oops buffer in cbmem passed through cb tables to payload"
+	default n
+	depends on CHROMEOS_RAMOOPS && !HAVE_ACPI_TABLES
+
 config CHROMEOS_RAMOOPS_RAM_START
 	hex "Physical address of preserved RAM"
 	default 0x00f00000

src/vendorcode/google/chromeos/ramoops.c

@@ -20,6 +20,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <boot/coreboot_tables.h>
 #include <bootstate.h>
 #include <console/console.h>
 #include <cbmem.h>
@@ -99,4 +100,34 @@ void chromeos_ram_oops_init(chromeos_acpi_t *chromeos)
 	reserve_ram_oops_dynamic(chromeos);
 }
 
-#endif /* CONFIG_HAVE_ACPI_TABLES */
+#elif IS_ENABLED(CONFIG_CHROMEOS_RAMOOPS_NON_ACPI)
+
+static void ramoops_alloc(void *arg)
+{
+	const size_t size = CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE;
+
+	if (size == 0)
+		return;
+
+	if (cbmem_add(CBMEM_ID_RAM_OOPS, size) == NULL)
+		printk(BIOS_ERR, "Could not allocate RAMOOPS buffer\n");
+}
+
+BOOT_STATE_INIT_ENTRY(BS_WRITE_TABLES, BS_ON_ENTRY, ramoops_alloc, NULL);
+
+#endif
+
+void lb_ramoops(struct lb_header *header)
+{
+	void *buffer = cbmem_find(CBMEM_ID_RAM_OOPS);
+
+	if (buffer == NULL)
+		return;
+
+	struct lb_range *ramoops;
+	ramoops = (struct lb_range *)lb_new_record(header);
+	ramoops->tag = LB_TAG_RAM_OOPS;
+	ramoops->size = sizeof(*ramoops);
+	ramoops->range_start = (uintptr_t)buffer;
+	ramoops->range_size = CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE;
+}