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rtl: add LinkerSet

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Loïc Grégoire
2026-07-04 22:50:15 -04:00
parent 1647da3329
commit 2d18761822
12 changed files with 94 additions and 50 deletions
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src/kern/tunable.zig
+23 -19
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@@ -5,6 +5,8 @@ const rtl = @import("rtl");
const r = @import("root");
const pl = r.pl;
const set = rtl.LinkerSet("tunables", *const Entry);
const Entry = struct {
name: []const u8,
address: *anyopaque,
@@ -18,7 +20,7 @@ pub fn Tunable(comptime T: type, comptime default: T, comptime name: []const u8)
return struct {
var storage: T = default;
const metadata: Entry linksection(".data.tunable") =
const metadata: Entry =
.{
.name = name,
.address = &storage,
@@ -30,33 +32,32 @@ pub fn Tunable(comptime T: type, comptime default: T, comptime name: []const u8)
},
};
comptime {
_ = set.insert(&metadata);
}
pub fn load() T {
_ = metadata;
return storage;
}
};
}
extern var __tunables_start: u8;
extern var __tunables_end: u8;
pub fn init(boot_info: *pl.BootInfo) void {
const cmdline = boot_info.cmdline orelse return;
const start = @intFromPtr(&__tunables_start);
const end = @intFromPtr(&__tunables_end);
const count = (end - start) / @sizeOf(Entry);
const entries: [*]Entry = @ptrFromInt(start);
const elems = set.elems();
for (0..count) |i| {
switch (entries[i].type) {
for (elems) |entry| {
switch (entry.type) {
.num => |info| {
const a = entries[i].address;
const a = entry.address;
switch (info.signedness) {
.unsigned => {
const value = rtl.cmdline.get_number(u64, cmdline, entries[i].name) orelse {
std.log.warn("Invalid number value for '{s}', falling back.", .{entries[i].name});
const value = rtl.cmdline.get_number(u64, cmdline, entry.name) catch |e| {
if (e == error.Format) {
std.log.warn("Invalid number value for '{s}', falling back.", .{entry.name});
}
continue;
};
@@ -70,8 +71,11 @@ pub fn init(boot_info: *pl.BootInfo) void {
},
.signed => {
const value = rtl.cmdline.get_number(i64, cmdline, entries[i].name) orelse {
std.log.warn("Invalid number value for '{s}', falling back.", .{entries[i].name});
const value = rtl.cmdline.get_number(i64, cmdline, entry.name) catch |e| {
if (e == error.Format) {
std.log.warn("Invalid number value for '{s}', falling back.", .{entry.name});
}
continue;
};
@@ -87,15 +91,15 @@ pub fn init(boot_info: *pl.BootInfo) void {
},
.bool => {
const value = rtl.cmdline.get_string(cmdline, entries[i].name) orelse continue;
const ptr: *bool = @ptrCast(@alignCast(entries[i].address));
const value = rtl.cmdline.get_string(cmdline, entry.name) orelse continue;
const ptr: *bool = @ptrCast(@alignCast(entry.address));
if (std.mem.eql(u8, value, "true")) {
ptr.* = true;
} else if (std.mem.eql(u8, value, "false")) {
ptr.* = false;
} else {
std.log.warn("Invalid cmdline boolean value for tunable '{s}'", .{entries[i].name});
std.log.warn("Invalid cmdline boolean value for tunable '{s}'", .{entry.name});
}
},
}