root: Add devicesByKind syscall

2 files changed, 34 insertions, 0 deletions

diff --git a/src/hwinfo.zig b/src/hwinfo.zig
new file mode 100644
index 0000000..0a6909e
--- /dev/null
+++ b/src/hwinfo.zig
@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+pub const DevKind = enum(u32) {
+    cpus,
+    plic,
+    pcie,
+    pci,
+    _,
+};
+
+pub const Dev = extern struct {
+    kind: DevKind,
+    reg: Reg,
+    value: u64,
+};
+
+pub const Reg = extern struct {
+    addr: u64,
+    len: u64,
+
+    pub fn slice(self: Reg, comptime T: type) []volatile T {
+        const ptr: [*]volatile T = @ptrFromInt(self.addr);
+        return ptr[0 .. self.len / @sizeOf(T)];
+    }
+};
diff --git a/src/root.zig b/src/root.zig
index 43be54b..a8cc12c 100644
--- a/src/root.zig
+++ b/src/root.zig
@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
 const std = @import("std");
+pub const hwinfo = @import("hwinfo.zig");
 
 pub const max_args = 6;
 
@@ -85,3 +86,9 @@ pub fn rawUserinit() []const u8 {
     const result = ecall(100007, .{&ptr});
     return ptr[0..result.value];
 }
+
+pub fn devicesByKind(kind: hwinfo.DevKind, devices: []hwinfo.Dev) !usize {
+    const result = ecall(100008, .{ kind, devices.ptr, devices.len });
+    if (result.error_code != 0) return SyscallError.Kernel;
+    return result.value;
+}