loader: detect CPU features

src/arch/amd64/root.zig

@@ -739,3 +739,7 @@ pub const IdtEntry = extern struct {
         };
     }
 };
+
+pub const BootInfo = struct {
+    cpu_features: CpuFeatures,
+};

src/kern/amd64/init.zig

@@ -107,7 +107,7 @@ var initial_offsets: [1]usize = .{0};
 extern var __percpu_start: u8;
 
 pub fn early_init() linksection(r.init) void {
-    amd64.detect_cpu_features();
+    amd64.cpu_features = r.boot_info.arch_info.cpu_features;
     early_cpu_init();
 
     impl.cpu_offsets = &initial_offsets;

src/kern/init.zig

@@ -10,6 +10,8 @@ var thread0: ke.Thread = undefined;
 var stack: [r.kib(16)]u8 align(16) = undefined;
 
 pub fn init(boot_info: *r.BootInfo) linksection(r.init) void {
+    r.boot_info = boot_info;
+
     ke.ncpus = 1;
     ki.impl.early_init();
     ki.tunable.init(boot_info);

src/loader/amd64/impl.zig

@@ -113,4 +113,5 @@ pub fn debug_write(c: u8) void {
 
 pub fn init() void {
     amd64.detect_cpu_features();
+    r.loader_info.arch_info.cpu_features = amd64.cpu_features;
 }

src/loader/info.zig

@@ -1,3 +1,5 @@
+const arch = @import("arch");
+
 /// Represents the system memory map.
 pub const MemMap = struct {
     /// A memory map entry.
@@ -32,8 +34,6 @@ pub const Framebuffer = struct {
 // Kept in sync with the kernel
 pub const page_struct_size = 16;
 
-pub const KernelAddress = struct { physical_base: usize, virtual_base: usize };
-
 /// RSDP on ACPI machines
 rsdp: ?usize,
 
@@ -46,5 +46,4 @@ memory_map: MemMap,
 /// Framebuffer info, if available
 framebuffer: ?Framebuffer,
 
-/// Kernel address
-kernel_address: KernelAddress,
+arch_info: arch.BootInfo,

src/root.zig

@@ -24,6 +24,8 @@ pub const Nanoseconds = u64;
 pub var kernel_heap_base: usize = 0;
 pub var kernel_pfndb_base: usize = 0;
 
+pub var boot_info: *BootInfo = undefined;
+
 /// Return N kibibytes in bytes.
 pub fn kib(comptime N: u32) usize {
     return N * 1024;