roms: Add OpenSBI version 0.4

Add OpenSBI version 0.4 as a git submodule and as a prebult binary.

OpenSBI (https://github.com/riscv/opensbi) aims to provide an open-source
reference implementation of the RISC-V Supervisor Binary Interface (SBI)
specifications for platform-specific firmwares executing in M-mode. For all
supported platforms, OpenSBI provides several runtime firmware examples.
These example firmwares can be used to replace the legacy riscv-pk bootloader
and enable the use of well-known bootloaders such as U-Boot.

OpenSBI is distributed under the terms of the BSD 2-clause license
("Simplified BSD License" or "FreeBSD License", SPDX: BSD-2-Clause). OpenSBI
source code also contains code reused from other projects desribed here:
https://github.com/riscv/opensbi/blob/master/ThirdPartyNotices.md.

In this case all of the code we are using from OpenSBI is BSD 2-clause
as we aren't using the Kendryte code (Apache-2.0) with QEMU and libfdt
is dual licensed as BSD 2-clause (and GPL-2.0+). OpenSBI isn't being
linked with QEMU either it is just being included with QEMU.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

2 files changed, 36 insertions, 12 deletions

diff --git a/roms/Makefile b/roms/Makefile
index 078d3fb705..dc70fb5aea 100644
--- a/roms/Makefile
+++ b/roms/Makefile
@@ -37,6 +37,8 @@ find-cross-prefix = $(subst gcc,,$(notdir $(call find-cross-gcc,$(1))))
 powerpc64_cross_prefix := $(call find-cross-prefix,powerpc64)
 powerpc_cross_prefix := $(call find-cross-prefix,powerpc)
 x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
+riscv32_cross_prefix := $(call find-cross-prefix,riscv32)
+riscv64_cross_prefix := $(call find-cross-prefix,riscv64)
 
 # tag our seabios builds
 SEABIOS_EXTRAVERSION="-prebuilt.qemu.org"
@@ -52,18 +54,21 @@ EDK2_EFIROM = edk2/BaseTools/Source/C/bin/EfiRom
 default:
 	@echo "nothing is build by default"
 	@echo "available build targets:"
-	@echo "  bios           -- update bios.bin (seabios)"
-	@echo "  vgabios        -- update vgabios binaries (seabios)"
-	@echo "  sgabios        -- update sgabios binaries"
-	@echo "  pxerom         -- update nic roms (bios only)"
-	@echo "  efirom         -- update nic roms (bios+efi)"
-	@echo "  slof           -- update slof.bin"
-	@echo "  skiboot        -- update skiboot.lid"
-	@echo "  u-boot.e500    -- update u-boot.e500"
-	@echo "  u-boot.sam460  -- update u-boot.sam460"
-	@echo "  efi            -- update UEFI (edk2) platform firmware"
-	@echo "  clean          -- delete the files generated by the previous" \
-	                          "build targets"
+	@echo "  bios               -- update bios.bin (seabios)"
+	@echo "  vgabios            -- update vgabios binaries (seabios)"
+	@echo "  sgabios            -- update sgabios binaries"
+	@echo "  pxerom             -- update nic roms (bios only)"
+	@echo "  efirom             -- update nic roms (bios+efi)"
+	@echo "  slof               -- update slof.bin"
+	@echo "  skiboot            -- update skiboot.lid"
+	@echo "  u-boot.e500        -- update u-boot.e500"
+	@echo "  u-boot.sam460      -- update u-boot.sam460"
+	@echo "  efi                -- update UEFI (edk2) platform firmware"
+	@echo "  opensbi32-virt     -- update OpenSBI for 32-bit virt machine"
+	@echo "  opensbi64-virt     -- update OpenSBI for 64-bit virt machine"
+	@echo "  opensbi64-sifive_u -- update OpenSBI for 64-bit sifive_u machine"
+	@echo "  clean              -- delete the files generated by the previous" \
+	                              "build targets"
 
 bios: build-seabios-config-seabios-128k build-seabios-config-seabios-256k
 	cp seabios/builds/seabios-128k/bios.bin ../pc-bios/bios.bin
@@ -162,6 +167,24 @@ skiboot:
 efi: edk2-basetools
 	$(MAKE) -f Makefile.edk2
 
+opensbi32-virt:
+	$(MAKE) -C opensbi \
+		CROSS_COMPILE=$(riscv32_cross_prefix) \
+		PLATFORM="qemu/virt"
+	cp opensbi/build/platform/qemu/virt/firmware/fw_jump.bin ../pc-bios/opensbi-riscv32-virt-fw_jump.bin
+
+opensbi64-virt:
+	$(MAKE) -C opensbi \
+		CROSS_COMPILE=$(riscv64_cross_prefix) \
+		PLATFORM="qemu/virt"
+	cp opensbi/build/platform/qemu/virt/firmware/fw_jump.bin ../pc-bios/opensbi-riscv64-virt-fw_jump.bin
+
+opensbi64-sifive_u:
+	$(MAKE) -C opensbi \
+		CROSS_COMPILE=$(riscv64_cross_prefix) \
+		PLATFORM="qemu/sifive_u"
+	cp opensbi/build/platform/qemu/virt/firmware/fw_jump.bin ../pc-bios/opensbi-riscv64-sifive_u-fw_jump.bin
+
 clean:
 	rm -rf seabios/.config seabios/out seabios/builds
 	$(MAKE) -C sgabios clean
@@ -173,3 +196,4 @@ clean:
 	$(MAKE) -C u-boot-sam460ex distclean
 	$(MAKE) -C skiboot clean
 	$(MAKE) -f Makefile.edk2 clean
+	$(MAKE) -C opensbi clean
diff --git a/roms/opensbi b/roms/opensbi
new file mode 160000
+Subproject ce228ee0919deb9957192d723eecc8aaae2697c