soc/amd/common/vboot: Split transfer buffer methods into separate file

I want to reuse the transfer buffer methods in SMM, so I need to add
them into their own file. I renamed `setup_cbmem_console` to
`replay_transfer_buffer_cbmemc` so it has a more descriptive name. I
also fixed the comment on `verify_psp_transfer_buf`.

BUG=b:221231786
TEST=Boot guybrush to OS

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I4f3a8b414b91f601c3a9c3dc7af8f388286fe4da
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62348
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

3 files changed, 90 insertions, 83 deletions

diff --git a/src/soc/amd/common/vboot/Makefile.inc b/src/soc/amd/common/vboot/Makefile.inc
index 8a6f1162f8..6938d16e69 100644
--- a/src/soc/amd/common/vboot/Makefile.inc
+++ b/src/soc/amd/common/vboot/Makefile.inc
@@ -6,3 +6,4 @@ ramstage-y += vbnv_cmos.c
 endif
 
 bootblock-$(CONFIG_VBOOT_STARTS_BEFORE_BOOTBLOCK) += vboot_bootblock.c
+bootblock-$(CONFIG_VBOOT_STARTS_BEFORE_BOOTBLOCK) += transfer_buffer.c
diff --git a/src/soc/amd/common/vboot/transfer_buffer.c b/src/soc/amd/common/vboot/transfer_buffer.c
new file mode 100644
index 0000000000..06e564a2f3
--- /dev/null
+++ b/src/soc/amd/common/vboot/transfer_buffer.c
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/reset.h>
+#include <console/cbmem_console.h>
+#include <console/console.h>
+#include <pc80/mc146818rtc.h>
+#include <security/vboot/vbnv.h>
+#include <security/vboot/symbols.h>
+#include <soc/psp_transfer.h>
+#include <timestamp.h>
+#include <2struct.h>
+
+int transfer_buffer_valid(const struct transfer_info_struct *ptr)
+{
+	if (ptr->magic_val == TRANSFER_MAGIC_VAL && ptr->struct_bytes == sizeof(*ptr))
+		return 1;
+	else
+		return 0;
+}
+
+void verify_psp_transfer_buf(void)
+{
+	if (*(uint32_t *)_vboot2_work == VB2_SHARED_DATA_MAGIC) {
+		cmos_write(0x00, CMOS_RECOVERY_BYTE);
+		return;
+	}
+
+	/*
+	 * If CMOS is valid and the system has already been rebooted once, but
+	 * still returns here, instead of rebooting to verstage again, assume
+	 * that the system is in a reboot loop and halt.
+	 */
+	if ((!vbnv_cmos_failed()) && cmos_read(CMOS_RECOVERY_BYTE) ==
+			CMOS_RECOVERY_MAGIC_VAL)
+		die("Error: Reboot into recovery was unsuccessful.  Halting.");
+
+	printk(BIOS_ERR, "VBOOT workbuf not valid.\n");
+	printk(BIOS_DEBUG, "Signature: %#08x\n", *(uint32_t *)_vboot2_work);
+	cmos_init(0);
+	cmos_write(CMOS_RECOVERY_MAGIC_VAL, CMOS_RECOVERY_BYTE);
+	warm_reset();
+}
+
+void show_psp_transfer_info(void)
+{
+	struct transfer_info_struct *info = (struct transfer_info_struct *)
+			(void *)(uintptr_t)_transfer_buffer;
+
+	if (transfer_buffer_valid(info)) {
+		if ((info->psp_info & PSP_INFO_VALID) == 0) {
+			printk(BIOS_INFO, "No PSP info found in transfer buffer.\n");
+			return;
+		}
+
+		printk(BIOS_INFO, "PSP boot mode: %s\n",
+				info->psp_info & PSP_INFO_PRODUCTION_MODE ?
+				"Production" : "Development");
+		printk(BIOS_INFO, "Silicon level: %s\n",
+				info->psp_info & PSP_INFO_PRODUCTION_SILICON ?
+				"Production" : "Pre-Production");
+	}
+}
+
+void replay_transfer_buffer_cbmemc(const struct transfer_info_struct *info)
+{
+
+	void *cbmemc;
+	size_t cbmemc_size;
+
+	if (info->console_offset < sizeof(*info))
+		return;
+
+	if (info->timestamp_offset <= info->console_offset)
+		return;
+
+	cbmemc_size = info->timestamp_offset - info->console_offset;
+
+	if (info->console_offset + cbmemc_size > info->buffer_size)
+		return;
+
+	cbmemc = (void *)((uintptr_t)info + info->console_offset);
+
+	/* We need to manually initialize cbmemc so we can fill the new buffer. cbmemc_init()
+	 * will also be called later in console_hw_init(), but it will be a no-op. */
+	cbmemc_init();
+	cbmemc_copy_in(cbmemc, cbmemc_size);
+}
diff --git a/src/soc/amd/common/vboot/vboot_bootblock.c b/src/soc/amd/common/vboot/vboot_bootblock.c
index e3705d1d6a..72648368e4 100644
--- a/src/soc/amd/common/vboot/vboot_bootblock.c
+++ b/src/soc/amd/common/vboot/vboot_bootblock.c
@@ -1,91 +1,10 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <amdblocks/reset.h>
 #include <bootblock_common.h>
-#include <console/cbmem_console.h>
 #include <console/console.h>
-#include <pc80/mc146818rtc.h>
-#include <security/vboot/vbnv.h>
-#include <security/vboot/symbols.h>
 #include <soc/psp_transfer.h>
+#include <symbols.h>
 #include <timestamp.h>
-#include <2struct.h>
-
-static int transfer_buffer_valid(const struct transfer_info_struct *ptr)
-{
-	if (ptr->magic_val == TRANSFER_MAGIC_VAL && ptr->struct_bytes == sizeof(*ptr))
-		return 1;
-	else
-		return 0;
-}
-
-void verify_psp_transfer_buf(void)
-{
-	if (*(uint32_t *)_vboot2_work == VB2_SHARED_DATA_MAGIC) {
-		cmos_write(0x00, CMOS_RECOVERY_BYTE);
-		return;
-	}
-
-	/*
-	 * If CMOS is valid and the system has already been rebooted once, but
-	 * still returns here, instead of rebooting to verstage again, assume
-	 * that the system is in a reboot loop and halt.
-	 */
-	if ((!vbnv_cmos_failed()) && cmos_read(CMOS_RECOVERY_BYTE) ==
-			CMOS_RECOVERY_MAGIC_VAL)
-		die("Error: Reboot into recovery was unsuccessful.  Halting.");
-
-	printk(BIOS_ERR, "VBOOT workbuf not valid.\n");
-	printk(BIOS_DEBUG, "Signature: %#08x\n", *(uint32_t *)_vboot2_work);
-	cmos_init(0);
-	cmos_write(CMOS_RECOVERY_MAGIC_VAL, CMOS_RECOVERY_BYTE);
-	warm_reset();
-}
-
-void show_psp_transfer_info(void)
-{
-	struct transfer_info_struct *info = (struct transfer_info_struct *)
-			(void *)(uintptr_t)_transfer_buffer;
-
-	if (transfer_buffer_valid(info)) {
-		if ((info->psp_info & PSP_INFO_VALID) == 0) {
-			printk(BIOS_INFO, "No PSP info found in transfer buffer.\n");
-			return;
-		}
-
-		printk(BIOS_INFO, "PSP boot mode: %s\n",
-				info->psp_info & PSP_INFO_PRODUCTION_MODE ?
-				"Production" : "Development");
-		printk(BIOS_INFO, "Silicon level: %s\n",
-				info->psp_info & PSP_INFO_PRODUCTION_SILICON ?
-				"Production" : "Pre-Production");
-	}
-}
-
-static void setup_cbmem_console(const struct transfer_info_struct *info)
-{
-
-	void *cbmemc;
-	size_t cbmemc_size;
-
-	if (info->console_offset < sizeof(*info))
-		return;
-
-	if (info->timestamp_offset <= info->console_offset)
-		return;
-
-	cbmemc_size = info->timestamp_offset - info->console_offset;
-
-	if (info->console_offset + cbmemc_size > info->buffer_size)
-		return;
-
-	cbmemc = (void *)((uintptr_t)info + info->console_offset);
-
-	/* We need to manually initialize cbmemc so we can fill the new buffer. cbmemc_init()
-	 * will also be called later in console_hw_init(), but it will be a no-op. */
-	cbmemc_init();
-	cbmemc_copy_in(cbmemc, cbmemc_size);
-}
 
 void boot_with_psp_timestamp(uint64_t base_timestamp)
 {
@@ -95,7 +14,7 @@ void boot_with_psp_timestamp(uint64_t base_timestamp)
 	if (!transfer_buffer_valid(info) || info->timestamp == 0)
 		return;
 
-	setup_cbmem_console(info);
+	replay_transfer_buffer_cbmemc(info);
 
 	/*
 	 * info->timestamp is PSP's timestamp (in microseconds)