feat(pl/ke): initial amd64 support

src/platform/amd64/entry.zig

@@ -1,3 +0,0 @@
-const b = @import("base");
-
-pub fn first_init() linksection(b.init) void {}

src/platform/amd64/impl.zig

@@ -1,6 +1,25 @@
-const entry = @import("entry.zig");
+const b = @import("base");
+const ki = b.ke.private;
 
-pub const first_init = entry.first_init;
+pub const name = "AMD64";
+
+pub fn first_init() void {}
+
+pub fn early_init() void {
+    const impl_cpu = &ki.bootstrap_cpu.impl;
+    impl_cpu.self_ptr = impl_cpu;
+    impl_cpu.percpu_offset = 0;
+
+    const impl_cpu_ptr = @intFromPtr(impl_cpu);
+    asm volatile ("wrmsr"
+        :
+        : [_] "{eax}" (@as(u32, @intCast(impl_cpu_ptr & 0xFFFFFFFF))),
+          [_] "{edx}" (@as(u32, @truncate(impl_cpu_ptr >> 32))),
+          [_] "{ecx}" (0xC000_0101),
+    );
+}
+
+pub fn late_init() void {}
 
 pub fn devices_init() void {}
 

src/platform/limine/entry.zig

@@ -0,0 +1,31 @@
+const b = @import("base");
+const ksyms = @import("ksyms");
+
+const pl = b.pl;
+const ke = b.ke;
+
+pub const std_options = b.std_options;
+pub const panic = b.panic;
+
+pub const rtl = @import("rtl");
+
+const std = @import("std");
+
+var boot_info: pl.BootInfo = undefined;
+
+export fn kmain() callconv(.c) void {
+    std.log.info("hello from kernel!", .{});
+
+    for (ksyms.ksyms) |sym| {
+        std.log.info("  0x{x:0>16} {s}", .{ sym.addr, sym.name });
+    }
+
+    boot_info.memory_map.entry_count = 0;
+
+    var cpus: [1]*ke.Cpu = .{&ke.private.bootstrap_cpu};
+
+    ke.ncpus = 1;
+    ke.cpus = &cpus;
+
+    ke.private.init(&boot_info);
+}

src/platform/root.zig

@@ -10,6 +10,10 @@ else if (@hasDecl(config, "CONFIG_ARCH_UM"))
 else
     @compileError("unsupported architecture");
 
+pub inline fn first_init() void {
+    return impl.first_init();
+}
+
 /// Early platform-specific initialization, called before anything else.
 pub inline fn early_init() void {
     return impl.early_init();

src/platform/um/entry.zig

@@ -1,6 +1,7 @@
 const b = @import("base");
 
 pub const std_options = b.std_options;
+pub const panic = b.panic;
 
 pub const rtl = @import("rtl");
 

src/platform/um/timer.zig

@@ -27,7 +27,7 @@ pub fn arm_timer(ns: b.Nanoseconds) void {
     }, .it_interval = .{ .tv_sec = 0, .tv_nsec = 0 } };
 
     if (c.timer_settime(timerid, 0, &value, null) == -1) {
-        ke.panic("timer_settime failed", .{});
+        @panic("timer_settime failed");
     }
 }
 
@@ -68,6 +68,6 @@ pub fn init_cpu() void {
     sev._sigev_un._tid = linux.gettid();
 
     if (c.timer_create(c.CLOCK_MONOTONIC, &sev, &timerid) == -1) {
-        ke.panic("timer_create failed", .{});
+        @panic("timer_create failed");
     }
 }