efi_loader: Enable RISCV_EFI_BOOT_PROTOCOL support

This adds support for new RISCV_EFI_BOOT_PROTOCOL to
communicate the boot hart ID to bootloader/kernel on RISC-V
UEFI platforms.

The specification of the protocol is hosted at:
https://github.com/riscv-non-isa/riscv-uefi

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

diff --git a/include/efi_api.h b/include/efi_api.h
index 8d5d835..f123d05 100644 (file)
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -438,6 +438,10 @@ struct efi_runtime_services {
        EFI_GUID(0x607f766c, 0x7455, 0x42be, 0x93, \
                 0x0b, 0xe4, 0xd7, 0x6d, 0xb2, 0x72, 0x0f)
 
+#define RISCV_EFI_BOOT_PROTOCOL_GUID \
+       EFI_GUID(0xccd15fec, 0x6f73, 0x4eec, 0x83, \
+                0x95, 0x3e, 0x69, 0xe4, 0xb9, 0x40, 0xbf)
+
 /**
  * struct efi_configuration_table - EFI Configuration Table
  *

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 701efcd..1fa75b4 100644 (file)
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -527,6 +527,8 @@ efi_status_t efi_disk_register(void);
 efi_status_t efi_rng_register(void);
 /* Called by efi_init_obj_list() to install EFI_TCG2_PROTOCOL */
 efi_status_t efi_tcg2_register(void);
+/* Called by efi_init_obj_list() to install RISCV_EFI_BOOT_PROTOCOL */
+efi_status_t efi_riscv_register(void);
 /* Called by efi_init_obj_list() to do initial measurement */
 efi_status_t efi_tcg2_do_initial_measurement(void);
 /* measure the pe-coff image, extend PCR and add Event Log */

diff --git a/include/efi_riscv.h b/include/efi_riscv.h
new file mode 100644 (file)
index 0000000..4bd39c4
--- /dev/null
+++ b/include/efi_riscv.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * RISCV_EFI_BOOT_PROTOCOL
+ *
+ * Copyright (c) 2022 Ventana Micro Systems Inc
+ */
+
+#include <efi_api.h>
+
+#define RISCV_EFI_BOOT_PROTOCOL_REVISION 0x00010000
+
+/**
+ * struct riscv_efi_boot_protocol - RISCV_EFI_BOOT_PROTOCOL
+ * @revision:          Version of the protocol implemented
+ * @get_boot_hartid:   Get the boot hart ID
+ */
+struct riscv_efi_boot_protocol {
+       u64 revision;
+
+       efi_status_t (EFIAPI * get_boot_hartid) (struct riscv_efi_boot_protocol *this,
+                                                efi_uintn_t *boot_hartid);
+};
+
+extern struct riscv_efi_boot_protocol riscv_efi_boot_prot;

diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 24f9a2b..e5e35fe 100644 (file)
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -369,4 +369,14 @@ config EFI_ESRT
        help
          Enabling this option creates the ESRT UEFI system table.
 
+config EFI_RISCV_BOOT_PROTOCOL
+       bool "RISCV_EFI_BOOT_PROTOCOL support"
+       default y
+       depends on RISCV
+       help
+         The EFI_RISCV_BOOT_PROTOCOL is used to transfer the boot hart ID
+         to the next boot stage. It should be enabled as it is meant to
+         replace the transfer via the device-tree. The latter is not
+         possible on systems using ACPI.
+
 endif

diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index fd344ce..b2c664d 100644 (file)
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_GENERATE_ACPI_TABLE) += efi_acpi.o
 obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += efi_smbios.o
 obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_rng.o
 obj-$(CONFIG_EFI_TCG2_PROTOCOL) += efi_tcg2.o
+obj-$(CONFIG_EFI_RISCV_BOOT_PROTOCOL) += efi_riscv.o
 obj-$(CONFIG_EFI_LOAD_FILE2_INITRD) += efi_load_initrd.o
 obj-$(CONFIG_EFI_SIGNATURE_SUPPORT) += efi_signature.o
 

diff --git a/lib/efi_loader/efi_riscv.c b/lib/efi_loader/efi_riscv.c
new file mode 100644 (file)
index 0000000..bccfefd
--- /dev/null
+++ b/lib/efi_loader/efi_riscv.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Defines APIs that allow an OS to interact with UEFI firmware to query
+ * information about the boot hart ID.
+ *
+ * Copyright (c) 2022, Ventana Micro Systems Inc
+ */
+
+#define LOG_CATEGORY LOGC_EFI
+#include <common.h>
+#include <efi_loader.h>
+#include <efi_variable.h>
+#include <log.h>
+#include <asm/global_data.h>
+#include <efi_riscv.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const efi_guid_t efi_guid_riscv_boot_protocol = RISCV_EFI_BOOT_PROTOCOL_GUID;
+
+/**
+ * efi_riscv_get_boot_hartid() - return boot hart ID
+ * @this:              RISCV_EFI_BOOT_PROTOCOL instance
+ * @boot_hartid:       caller allocated memory to return boot hart id
+ * Return:             status code
+ */
+static efi_status_t EFIAPI
+efi_riscv_get_boot_hartid(struct riscv_efi_boot_protocol *this,
+                         efi_uintn_t *boot_hartid)
+{
+       EFI_ENTRY("%p, %p",  this, boot_hartid);
+
+       if (this != &riscv_efi_boot_prot || !boot_hartid)
+               return EFI_INVALID_PARAMETER;
+
+       *boot_hartid = gd->arch.boot_hart;
+
+       return EFI_EXIT(EFI_SUCCESS);
+}
+
+struct riscv_efi_boot_protocol riscv_efi_boot_prot = {
+       .revision = RISCV_EFI_BOOT_PROTOCOL_REVISION,
+       .get_boot_hartid = efi_riscv_get_boot_hartid
+};
+
+/**
+ * efi_riscv_register() - register RISCV_EFI_BOOT_PROTOCOL
+ *
+ * Return:     status code
+ */
+efi_status_t efi_riscv_register(void)
+{
+       efi_status_t ret = EFI_SUCCESS;
+
+       ret = efi_add_protocol(efi_root, &efi_guid_riscv_boot_protocol,
+                              (void *)&riscv_efi_boot_prot);
+       if (ret != EFI_SUCCESS)
+               log_err("Cannot install RISCV_EFI_BOOT_PROTOCOL\n");
+       return ret;
+}

diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index 49172e3..380adc1 100644 (file)
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -247,6 +247,12 @@ efi_status_t efi_init_obj_list(void)
                        goto out;
        }
 
+       if (IS_ENABLED(CONFIG_EFI_RISCV_BOOT_PROTOCOL)) {
+               ret = efi_riscv_register();
+               if (ret != EFI_SUCCESS)
+                       goto out;
+       }
+
        /* Secure boot */
        ret = efi_init_secure_boot();
        if (ret != EFI_SUCCESS)