merge sbi base and error handling modules into single main module file

1 files changed, 123 insertions, 0 deletions

diff --git a/src/sbi.zig b/src/sbi.zig
new file mode 100644
index 0000000..2072b90
--- /dev/null
+++ b/src/sbi.zig
@@ -0,0 +1,123 @@
+// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+const instructions = @import("instructions.zig");
+
+pub const Error = error{
+    Success,
+    Failed,
+    NotSupported,
+    InvalidParam,
+    Denied,
+    InvalidAddr,
+    AlreadyAvail,
+    AlreadyStarted,
+    AlreadyStopped,
+    NoSharedMem,
+    Unknown,
+};
+
+pub fn errorFromCode(code: isize) Error {
+    return switch (code) {
+        0 => Error.Success,
+        -1 => Error.Failed,
+        -2 => Error.NotSupported,
+        -3 => Error.InvalidParam,
+        -4 => Error.Denied,
+        -5 => Error.InvalidAddr,
+        -6 => Error.AlreadyAvail,
+        -7 => Error.AlreadyStarted,
+        -8 => Error.AlreadyStopped,
+        -9 => Error.NoSharedMem,
+        else => Error.Unknown,
+    };
+}
+
+const BaseExtId: usize = 0x10;
+
+const BaseFnId = enum(usize) {
+    GetSpecVer = 0,
+    GetImpId = 1,
+    GetImpVer = 2,
+    ProbeExt = 3,
+    GetMVendorId = 4,
+    GetMArchId = 5,
+    GetMImpId = 6,
+};
+
+pub const ImpId = enum(isize) {
+    Bbl = 0,
+    OpenSbi = 1,
+    Xvisor = 2,
+    Kvm = 3,
+    RustSbi = 4,
+    Diosix = 5,
+    Coffer = 6,
+    Xen = 7,
+    PolarFire = 8,
+    _,
+};
+
+pub fn specVer() !isize {
+    const ret = instructions.ecall(BaseExtId, @intFromEnum(BaseFnId.GetSpecVer), 0, 0, 0);
+    if (ret.err != 0) {
+        return errorFromCode(ret.err);
+    }
+
+    return ret.val;
+}
+
+pub fn impId() !ImpId {
+    const ret = instructions.ecall(BaseExtId, @intFromEnum(BaseFnId.GetImpId), 0, 0, 0);
+    if (ret.err != 0) {
+        return errorFromCode(ret.err);
+    }
+
+    return @enumFromInt(ret.val);
+}
+
+pub fn impVer() !isize {
+    const ret = instructions.ecall(BaseExtId, @intFromEnum(BaseFnId.GetImpVer), 0, 0, 0);
+    if (ret.err != 0) {
+        return errorFromCode(ret.err);
+    }
+
+    return ret.val;
+}
+
+pub fn probeExt(ext_id: usize) !bool {
+    const ret = instructions.ecall(BaseExtId, @intFromEnum(BaseFnId.ProbeExt), ext_id, 0, 0);
+    if (ret.err != 0) {
+        return errorFromCode(ret.err);
+    }
+
+    return ret.val != 0;
+}
+
+pub fn mVendorId() !isize {
+    const ret = instructions.ecall(BaseExtId, @intFromEnum(BaseFnId.GetMVendorId), 0, 0, 0);
+    if (ret.err != 0) {
+        return errorFromCode(ret.err);
+    }
+
+    return ret.val;
+}
+
+pub fn mArchId() !isize {
+    const ret = instructions.ecall(BaseExtId, @intFromEnum(BaseFnId.GetMarchId), 0, 0, 0);
+    if (ret.err != 0) {
+        return errorFromCode(ret.err);
+    }
+
+    return ret.val;
+}
+
+pub fn mImpId() !isize {
+    const ret = instructions.ecall(BaseExtId, @intFromEnum(BaseFnId.GetMImpId), 0, 0, 0);
+    if (ret.err != 0) {
+        return errorFromCode(ret.err);
+    }
+
+    return ret.val;
+}