vc/amd,soc/amd/mendocino: Add SVC_CMD_GET_PREV_BOOT_STATUS

Add an SVC command to get the previous boot status. If there is any
pre-x86 boot failure in the previous boot cycle, PSP stores it in warm
reset persistent register and triggers a warm reset. PSP verstage on the
subsequent boot gets the previous boot status and reports any failure to
the vboot before a FW slot is selected.

BUG=b:242825052
TEST=Build Skyrim BIOS image and boot to OS in Skyrim. Trigger a failure
scenario by corrupting certain firmware blobs and observe that PSP
reports the failure boot status. On a normal boot, observed that PSP
reports successful boot.

Change-Id: I440deee560b72c80491bfdd7fda38a1c3a4299e5
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70381
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/mendocino/psp_verstage/svc.c

@@ -215,3 +215,13 @@ uint32_t svc_set_fw_hash_table(struct psp_fw_hash_table *hash_table)
 	SVC_CALL2(SVC_VERSTAGE_CMD, CMD_SET_FW_HASH_TABLE, (void *)&param, retval);
 	return retval;
 }
+
+uint32_t svc_get_prev_boot_status(uint32_t *boot_status)
+{
+	uint32_t retval = 0;
+	struct cmd_param_get_prev_boot_status param = {
+		.ptr_boot_status = boot_status,
+	};
+	SVC_CALL2(SVC_VERSTAGE_CMD, CMD_GET_PREV_BOOT_STATUS, (void *)&param, retval);
+	return retval;
+}

src/soc/amd/mendocino/psp_verstage/svc.h

@@ -94,4 +94,8 @@ struct cmd_param_set_fw_hash_table {
 	struct psp_fw_hash_table *ptr_psp_fw_hash_table;
 };
 
+struct cmd_param_get_prev_boot_status {
+	unsigned int *ptr_boot_status;
+};
+
 #endif /* PSP_VERSTAGE_SVC_H */

src/vendorcode/amd/fsp/cezanne/include/bl_uapp/bl_syscall_public.h

@@ -343,6 +343,15 @@ uint32_t svc_ccp_dma(uint32_t spi_rom_offset, void *dest, uint32_t size);
  -----------------------------------------------------------------------------*/
 uint32_t svc_set_platform_boot_mode(enum chrome_platform_boot_mode boot_mode);
 
+/* Get the previous boot status.
+ *
+ * Parameters:
+ * 	- boot_status - Address where the boot status is read into
+ *
+ * Return value: BL_OK or error code
+ */
+uint32_t svc_get_prev_boot_status(uint32_t *boot_status);
+
 /* C entry point for the Bootloader Userspace Application */
 void Main(void);
 

src/vendorcode/amd/fsp/mendocino/include/bl_uapp/bl_syscall_public.h

@@ -55,6 +55,7 @@ enum verstage_cmd_id {
 	CMD_CCP_DMA,
 	CMD_SET_PLATFORM_BOOT_MODE,
 	CMD_SET_FW_HASH_TABLE,
+	CMD_GET_PREV_BOOT_STATUS,
 };
 
 struct mod_exp_params {
@@ -369,6 +370,15 @@ uint32_t svc_set_platform_boot_mode(enum chrome_platform_boot_mode boot_mode);
  */
 uint32_t svc_set_fw_hash_table(struct psp_fw_hash_table *hash_table);
 
+/* Get the previous boot status.
+ *
+ * Parameters:
+ * 	- boot_status - Address where the boot status is read into
+ *
+ * Return value: BL_OK or error code
+ */
+uint32_t svc_get_prev_boot_status(uint32_t *boot_status);
+
 /* C entry point for the Bootloader Userspace Application */
 void Main(void);
 

src/vendorcode/amd/fsp/picasso/include/bl_uapp/bl_syscall_public.h

@@ -410,6 +410,15 @@ static inline uint32_t svc_ccp_dma(uint32_t spi_rom_offset, void *dest, uint32_t
 	return BL_ERR_UNSUPPORTED_PLATFORM;
 }
 
+/* Get the previous boot status.
+ *
+ * Parameters:
+ * 	- boot_status - Address where the boot status is read into
+ *
+ * Return value: BL_OK or error code
+ */
+uint32_t svc_get_prev_boot_status(uint32_t *boot_status);
+
 /* C entry point for the Bootloader Userspace Application */
 void Main(void);