feat(amd64): add PGE to cpuid

src/platform/amd64/cpu.zig

@@ -320,6 +320,7 @@ pub const CpuFeatures = struct {
     pcid: bool,
     smap: bool,
     smep: bool,
+    pge: bool,
     vendor_string: [12]u8,
     brand_string: [48]u8,
 };
@@ -343,6 +344,7 @@ pub fn detect_cpu_features() void {
     var pcid = false;
     var smap = false;
     var smep = false;
+    var pge = false;
 
     var vendor_string: [12]u8 = undefined;
     var brand_string: [48]u8 = undefined;
@@ -361,6 +363,7 @@ pub fn detect_cpu_features() void {
         xsave = ecx.xsave;
         pcid = ecx.pcid;
         fxsave = edx.fxsave;
+        pge = edx.pge;
     }
 
     if (max_basic >= 0x7) {
@@ -416,5 +419,6 @@ pub fn detect_cpu_features() void {
         .smep = smep,
         .vendor_string = vendor_string,
         .brand_string = brand_string,
+        .pge = pge,
     };
 }

src/platform/amd64/impl.zig

@@ -7,7 +7,7 @@ pub const name = "amd64";
 
 const com1 = 0x3F8;
 
-fn com1_init() void {
+fn com1_init() linksection(b.init) void {
     cpu.outb(com1 + 0x3, 0x80);
     cpu.outb(com1 + 0x0, 0x0c);
     cpu.outb(com1 + 0x1, 0x00);
@@ -44,12 +44,13 @@ pub fn early_init() linksection(b.init) void {
     const f = cpu.cpu_features;
 
     std.log.info("amd64/cpu: {s}", .{&f.brand_string});
-    std.log.info("amd64/cpu: vendor={s} x2apic={} la57={} nx={} pcid={} smap={} smep={} pdpe1g={} invtsc={} xsave={} fxsave={} tsc-deadline={}", .{
+    std.log.info("amd64/cpu: vendor={s} x2apic={} la57={} nx={} pcid={} pge={} smap={} smep={} pdpe1g={} invtsc={} xsave={} fxsave={} tsc-deadline={}", .{
         &f.vendor_string,
         @intFromBool(f.x2apic),
         @intFromBool(f.five_level_paging),
         @intFromBool(f.nx),
         @intFromBool(f.pcid),
+        @intFromBool(f.pge),
         @intFromBool(f.smap),
         @intFromBool(f.smep),
         @intFromBool(f.gib_pages),