disable SSE

kernel/build.zig

@@ -11,6 +11,8 @@ const Target = struct {
     parent: ?*const Target = null,
     cpu_arch: ?std.Target.Cpu.Arch = null,
     cpu_model: ?std.build.Target.CpuModel = null,
+    extra_features: []const std.Target.Cpu.Feature = &[_] std.Target.Cpu.Feature {},
+    forbidden_features: []const std.Target.Cpu.Feature = &[_] std.Target.Cpu.Feature {},
     archdir: ?[]const u8 = null,
     linkscript: ?[]const u8 = null,
     name: []const u8,
@@ -20,9 +22,21 @@ const x86 = Target{
     .archdir = "x86",
     .name = "x86-generic",
 };
+const x86_64_nosse = std.Target.Cpu.Model {
+    .name = "x86_64-sse2+soft_float",
+    .llvm_name = null,
+    .features = std.Target.x86.featureSet(&[_] std.Target.x86.Feature {std.Target.x86.Feature.@"64bit"})
+};
 const x86_64 = Target {
     .parent = &x86,
     .cpu_arch = std.Target.Cpu.Arch.x86_64,
+    .extra_features = &[_] std.Target.Cpu.Feature {
+        std.Target.x86.all_features[@enumToInt(std.Target.x86.Feature.soft_float)],
+    },
+    .forbidden_features = &[_] std.Target.Cpu.Feature {
+        std.Target.x86.all_features[@enumToInt(std.Target.x86.Feature.sse)],
+        std.Target.x86.all_features[@enumToInt(std.Target.x86.Feature.sse2)],
+    },
     .archdir = "x86_64",
     .name = "x86_64-generic",
 };
@@ -71,7 +85,6 @@ const Targets = enum {
 fn getCpuArch(t: Target) std.Target.Cpu.Arch {
     return t.cpu_arch orelse getCpuArch(t.parent.?.*);
 }
-
 fn getCpuModel(t: Target) std.build.Target.CpuModel {
     if(t.cpu_model) |m| {
         return m;
@@ -81,15 +94,35 @@ fn getCpuModel(t: Target) std.build.Target.CpuModel {
         return std.build.Target.CpuModel.baseline;
     }
 }
-
+fn getExtraFeatures(t: Target) std.Target.Cpu.Feature.Set {
+    var parentset = std.Target.Cpu.Feature.Set.empty;
+    if(t.parent) |p| {
+        parentset = getExtraFeatures(p.*);
+    }
+    for (t.extra_features) |bl_ft| {
+        parentset.addFeature(bl_ft.index);
+    }
+    return parentset;
+}
+fn getForbiddenFeatures(t: Target) std.Target.Cpu.Feature.Set {
+    var parentset = std.Target.Cpu.Feature.Set.empty;
+    if(t.parent) |p| {
+        parentset = getForbiddenFeatures(p.*);
+    }
+    for (t.forbidden_features) |bl_ft| {
+        parentset.addFeature(bl_ft.index);
+    }
+    return parentset;
+}
 fn getLinkerScript(t: Target) []const u8 {
     return t.linkscript orelse getLinkerScript(t.parent.?.*);
 }
-
 fn getTarget(t: Target) std.zig.CrossTarget {
     return .{
         .cpu_arch = getCpuArch(t),
         .cpu_model = getCpuModel(t),
+        .cpu_features_add = getExtraFeatures(t),
+        .cpu_features_sub = getForbiddenFeatures(t),
         .os_tag = std.Target.Os.Tag.freestanding,
     };
 }
@@ -166,6 +199,7 @@ pub fn build(b: *Builder) !void {
 
     // Standard release options allow the person running `zig build` to select
     // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
+    // b.setPreferredReleaseMode(std.builtin.Mode.ReleaseSafe);
     const mode = b.standardReleaseOptions();
  
     const files = try findFiles(ktarget);
@@ -174,6 +208,7 @@ pub fn build(b: *Builder) !void {
 
     const exename = try std.fmt.allocPrint(alloc, "kernel-{}", .{ktarget.name});
     const exe = b.addExecutable(exename, "src/main.zig");
+    exe.addIncludeDir("src");
     var cfiles = std.ArrayList([]const u8).init(alloc);
     try cfiles.appendSlice(files.generic_c);
     try cfiles.appendSlice(files.archspecific_c);
@@ -193,11 +228,21 @@ pub fn build(b: *Builder) !void {
         exe.step.dependOn(&assX.step);
         exe.addObjectFile(output);
     }
+    // const zigobj = b.addObject("zigkalloc", "src/allocator/calloc.zig");
+    // zigobj.setTarget(getTarget(ktarget));
+    // zigobj.strip = true;
+    // // zigobj.single_threaded = true;
+    // // zigobj.code_model = std.builtin.CodeModel.kernel;
+    // exe.addObject(zigobj);
 
     exe.setTarget(getTarget(ktarget));
     exe.setBuildMode(mode);
+    // exe.code_model = std.builtin.CodeModel.kernel;
     exe.setLinkerScriptPath(getLinkerScript(ktarget));
     // exe.setOutputDir("bin");
+    // exe.strip = true;
+    // exe.single_threaded = true;
+
     exe.install();
 
     const run_cmd = exe.run();

kernel/make/x86_64/linker.ld

@@ -12,22 +12,22 @@ SECTIONS
 
     .text ALIGN(4K) :
     {
-        KEEP(*(.text*))
+        /* KEEP(*(.text*)) */
     }
 
     .rodata ALIGN(4K) :
     {
-        KEEP(*(.rodata*))
+        /* KEEP(*(.rodata*)) */
     }
 
     .data ALIGN(4K) :
     {
-        KEEP(*(.data*))
+        /* KEEP(*(.data*)) */
     }
 
     .bss ALIGN(4K) :
     {
-        KEEP(*(COMMON))
+        /* KEEP(*(COMMON)) */
-        KEEP(*(.bss*))
+        /* KEEP(*(.bss*)) */
     }
 }

kernel/src/allocator/calloc.zig

@@ -0,0 +1,19 @@
+const std = @import("std");
+
+var GlobAlloc: ?std.heap.FixedBufferAllocator = null;
+
+pub export fn kalloc_init(start: usize, len: usize) void {
+    // const aligned = std.mem.alignForward(start, 8);
+    const ptr = @intToPtr([*]u8, start);
+    const buf = ptr[0..len];
+    GlobAlloc = std.heap.FixedBufferAllocator.init(buf);
+}
+
+// export fn kalloc(bytes: usize, a: usize) void {
+//     var a = GlobAlloc.?.allocator.allocAdvanced(u8, a, bytes, std.mem.Allocator.Exact.at_least);
+//     return a catch unreachable;
+// }
+
+pub fn kallocNop() void {
+
+}

kernel/src/main.c

@@ -3,6 +3,10 @@
 #include "hal/info.h"
 #include "print/print.h"
 
+
+char TESTBUF[128] = "eeeeeeeeeeeee eeeeeeeeeeeeeeeeeeeeeeeeee - gigakubica";
+char PRINTBUF[128];
+
 void kmain() {
 	if(!validate_boot_info()) {
 		PANIC("Error: boot_info not entered!");
@@ -13,6 +17,14 @@ void kmain() {
 	printf("Usable memory: %h (at %x)\n", boot_info.usable.len, boot_info.usable.start);
 	printf("Cmdline: %s\n", boot_info.cmdline);
 
+	// kalloc_init(boot_info.usable.start);
+	zigmain();
+
+	// memcpy(PRINTBUF, TESTBUF, 32);
+	// puts(PRINTBUF);
+	
+	kalloc_init(boot_info.usable.start, boot_info.usable.len);
+
 	vga_setcolor(VGA_DARK_GRAY);
 	vga_write_elsewhere("(c) Quinten Kock 2020 (MIT License)", 24, 0);
 	halt_catch_fire();

kernel/src/main.zig

@@ -1,5 +1,52 @@
 const std = @import("std");
+const builtin = @import("builtin");
+
+pub const c_alloc = @import("allocator/calloc.zig");
+
+const c = @cImport({
+    @cInclude("hal/print.h");
+    @cInclude("print/print.h");
+    @cInclude("hal/ops.h");
+    if( builtin.cpu.arch == .x86_64 or builtin.cpu.arch == .i386) {
+        @cInclude("arch/x86/vga.h");
+    }
+});
+
+
+
+// pub extern fn puts([*:0]const u8) void;
+
+pub fn panic(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace) noreturn {
+    @setCold(true);
+    if(builtin.cpu.arch == .x86_64 or builtin.cpu.arch == .i386) {
+        c.vga_clear(c.VGA_BLUE);
+    }
+
+    c.printf("Kernel panic: ");
+    for (msg) |m| {
+        c.putchar(m);
+    }
+    c.putchar('\n');
+    if(error_return_trace) |trace| {
+        // c.panic("ee", "ee", 0);
+        c.printf("TRACE: %x %x\n", @intCast(usize, trace.*.index), trace.*.instruction_addresses.len);
+    }
+    const msgptr = @ptrCast([*c] const u8, msg);
+    // c.panic(msgptr, "", 0);
+            c.puts("HELP\n");
+            while(true) {}
+}
+
+
+export fn zigmain() void {
+
+    const message: [*:0]const u8 = "hello, zig!";
+    std.log.info("All your codebase are belong to us.", .{});
+    c.puts(message);
+    c_alloc.kallocNop();
+
+    var buffer: [32]u8 = undefined;
+    var alloc = std.heap.FixedBufferAllocator.init(&buffer);
+    var buf = alloc.allocator.alloc(u8, 40) catch unreachable;
 
-pub fn zigmain() anyerror!void {
-    std.log.info("All your codebase are belong to us.", .{});
 }