Pull request for UEFI sub-system for efi-2020-10-rc6

The following UEFI related issues are fixed:
 
 * restore the global data pointer in the RISC-V trap handler
 * install EFI_RNG_PROTOCOL only if we have a random number generator
 * display human readable string for EFI_RNG_PROTOCOL in efidebug command
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Merge tag 'efi-2020-10-rc6' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-10-rc6

The following UEFI related issues are fixed:

* restore the global data pointer in the RISC-V trap handler
* install EFI_RNG_PROTOCOL only if we have a random number generator
* display human readable string for EFI_RNG_PROTOCOL in efidebug command

arch/riscv/lib/interrupts.c

@@ -111,6 +111,9 @@ ulong handle_trap(ulong cause, ulong epc, ulong tval, struct pt_regs *regs)
 {
 	ulong is_irq, irq;
 
+	/* An UEFI application may have changed gd. Restore U-Boot's gd. */
+	efi_restore_gd();
+
 	is_irq = (cause & MCAUSE_INT);
 	irq = (cause & ~MCAUSE_INT);
 

cmd/efidebug.c

@@ -9,6 +9,7 @@
 #include <common.h>
 #include <command.h>
 #include <efi_loader.h>
+#include <efi_rng.h>
 #include <exports.h>
 #include <hexdump.h>
 #include <log.h>
@@ -248,6 +249,10 @@ static const struct {
 		"Load File2",
 		EFI_LOAD_FILE2_PROTOCOL_GUID,
 	},
+	{
+		"Random Number Generator",
+		EFI_RNG_PROTOCOL_GUID,
+	},
 	{
 		"Simple Network",
 		EFI_SIMPLE_NETWORK_PROTOCOL_GUID,

include/efi_loader.h

@@ -154,7 +154,6 @@ extern const struct efi_hii_config_routing_protocol efi_hii_config_routing;
 extern const struct efi_hii_config_access_protocol efi_hii_config_access;
 extern const struct efi_hii_database_protocol efi_hii_database;
 extern const struct efi_hii_string_protocol efi_hii_string;
-extern const struct efi_rng_protocol efi_rng_protocol;
 
 uint16_t *efi_dp_str(struct efi_device_path *dp);
 
@@ -404,6 +403,8 @@ efi_status_t EFIAPI efi_convert_pointer(efi_uintn_t debug_disposition,
 efi_status_t efi_console_register(void);
 /* Called by bootefi to make all disk storage accessible as EFI objects */
 efi_status_t efi_disk_register(void);
+/* Called by efi_init_obj_list() to install EFI_RNG_PROTOCOL */
+efi_status_t efi_rng_register(void);
 /* Create handles and protocols for the partitions of a block device */
 int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
 			       const char *if_typename, int diskid,

lib/efi_loader/efi_rng.c

@@ -3,6 +3,8 @@
  * Copyright (c) 2019, Linaro Limited
  */
 
+#define LOG_CATEGORY LOGC_EFI
+
 #include <common.h>
 #include <dm.h>
 #include <efi_loader.h>
@@ -144,7 +146,33 @@ back:
 	return EFI_EXIT(status);
 }
 
-const struct efi_rng_protocol efi_rng_protocol = {
+static const struct efi_rng_protocol efi_rng_protocol = {
 	.get_info = rng_getinfo,
 	.get_rng = getrng,
 };
+
+/**
+ * efi_rng_register() - register EFI_RNG_PROTOCOL
+ *
+ * If a RNG device is available, the Random Number Generator Protocol is
+ * registered.
+ *
+ * Return:	An error status is only returned if adding the protocol fails.
+ */
+efi_status_t efi_rng_register(void)
+{
+	efi_status_t ret;
+	struct udevice *dev;
+
+	ret = platform_get_rng_device(&dev);
+	if (ret != EFI_SUCCESS) {
+		log_warning("Missing RNG device for EFI_RNG_PROTOCOL");
+		return EFI_SUCCESS;
+	}
+	ret = efi_add_protocol(efi_root, &efi_guid_rng_protocol,
+			       (void *)&efi_rng_protocol);
+	if (ret != EFI_SUCCESS)
+		log_err("Cannot install EFI_RNG_PROTOCOL");
+
+	return ret;
+}

lib/efi_loader/efi_root_node.c

@@ -80,10 +80,6 @@ efi_status_t efi_root_node_register(void)
 			 /* HII configuration routing protocol */
 			 &efi_guid_hii_config_routing_protocol,
 			 (void *)&efi_hii_config_routing,
-#endif
-#if CONFIG_IS_ENABLED(EFI_RNG_PROTOCOL)
-			 &efi_guid_rng_protocol,
-			 (void *)&efi_rng_protocol,
 #endif
 			 NULL));
 	efi_root->type = EFI_OBJECT_TYPE_U_BOOT_FIRMWARE;

lib/efi_loader/efi_setup.c

@@ -151,6 +151,11 @@ efi_status_t efi_init_obj_list(void)
 	if (ret != EFI_SUCCESS)
 		goto out;
 #endif
+	if (IS_ENABLED(CONFIG_EFI_RNG_PROTOCOL)) {
+		ret = efi_rng_register();
+		if (ret != EFI_SUCCESS)
+			goto out;
+	}
 	/* Initialize variable services */
 	ret = efi_init_variables();
 	if (ret != EFI_SUCCESS)