internal/rosa/stage0: add riscv64 tarball

This had not yet passed all test suites because emulator is prohibitively slow.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/kernel_riscv64.go

@@ -0,0 +1,8 @@
+package rosa
+
+import _ "embed"
+
+//go:embed kernel_riscv64.config
+var kernelConfig []byte
+
+const kernelName = "bzImage"

internal/rosa/llvm.go

@@ -207,6 +207,8 @@ func (t Toolchain) newLLVM() (musl, compilerRT, runtimes, clang pkg.Artifact) {
 		target = "X86"
 	case "arm64":
 		target = "AArch64"
+	case "riscv64":
+		target = "RISCV"
 
 	default:
 		panic("unsupported target " + runtime.GOARCH)

internal/rosa/llvm_riscv64.go

@@ -0,0 +1,4 @@
+package rosa
+
+// clangPatches are patches applied to the LLVM source tree for building clang.
+var clangPatches []KV

internal/rosa/rosa.go

@@ -56,6 +56,8 @@ func linuxArch() string {
 		return "x86_64"
 	case "arm64":
 		return "aarch64"
+	case "riscv64":
+		return "riscv64"
 
 	default:
 		panic("unsupported target " + runtime.GOARCH)

internal/rosa/stage0.go

@@ -67,6 +67,8 @@ func NewStage0() pkg.Artifact {
 			seed = "tqM1Li15BJ-uFG8zU-XjgFxoN_kuzh1VxrSDVUVa0vGmo-NeWapSftH739sY8EAg"
 		case "arm64":
 			seed = "CJj3ZSnRyLmFHlWIQtTPQD9oikOZY4cD_mI3v_-LIYc2hhg-cq_CZFBLzQBAkFIn"
+		case "riscv64":
+			seed = "FcszJjcVWdKAnn-bt8qmUn5GUUTjv_xQjXOWkUpOplRkG3Ckob3StUoAi5KQ5-QF"
 
 		default:
 			panic("unsupported target " + runtime.GOARCH)