zigk: Implement debug printing

Makefile

@@ -17,6 +17,7 @@ run: $(KERNEL_HDD)
 	-drive file=$(KERNEL_HDD),format=raw \
 	-smp 2 \
 	-enable-kvm \
+	-debugcon stdio \
 	$(QEMUFLAGS)
 
 bochs: $(KERNEL_HDD) ext/bochsrc

kernel/src/allocator/kalloc.zig

@@ -15,5 +15,5 @@ pub export fn kalloc_init(start: usize, len: usize) void {
 // }
 
 pub fn kallocNop() void {
-
+    std.log.err("calling kallocNop", .{});
 }

kernel/src/arch/x86/panic.c

@@ -1,10 +0,0 @@
-#include "vga.h"
-#include <hal/ops.h>
-#include <print/print.h>
-
-void panic(const char *message, const char *filename, int line) {
-    vga_clear(VGA_BLUE);
-    printf("KernOS kernel panic:\n%s\n", message);
-    printf("at %s:%d", filename, line);
-    halt_catch_fire();
-}

kernel/src/debug.zig

@@ -0,0 +1,103 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const root = @import("root");
+
+const c = @cImport({
+    @cInclude("hal/debug.h");
+    @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 fn panicMultiline(msgs: comptime [][]const u8) noreturn {
+    @setCold(true);
+    if( builtin.cpu.arch == .x86_64 or builtin.cpu.arch == .i386) {
+        // TODO: make framebuffer API more neutral
+        c.vga_clear(c.VGA_BLUE);
+        c.vga_setcolor(c.VGA_WHITE);
+    }
+    // TODO: implement Zig printing
+    AWriter.writeAll(
+    \\/---------------------\
+    \\| KORNOS KERNEL PANIC |
+    \\\---------------------/
+    \\
+    ) catch unreachable;
+    for(msgs) |msg, i| {
+        // for(msg) |ch| {
+        //     c.putchar(ch);
+        // }
+        // AWriter.print("TYPE: {}", @typeName(msg));
+        try AWriter.writeAll(msg);
+        try AWriter.writeByte('\n');
+        // c.putchar('\n');
+    }
+    c.halt_catch_fire();
+    while(true) {}
+}
+
+pub fn zigpanic(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace) noreturn {
+    @setCold(true);
+    // TODO: parse error_return_trace
+    panicMultiline(&[_][]const u8 {msg, "\nat: (TODO implement zig stacktraces)"});
+}
+
+var panicbuf: [64]u8 = undefined;
+export fn panic(msg: [*:0]const u8, file: [*:0]const u8, line: usize) noreturn {
+    const len = std.mem.len(msg);
+    // @panic(msg[0..len]);
+    // const loc = std.fmt.bufPrint(&panicbuf, "at {}:{}", .{file, line}) catch "error displaying location";
+    const loc = file[0..std.mem.len(file)];
+    panicMultiline(&[_][]const u8 {msg[0..len], "", loc});
+}
+
+pub fn log(
+    comptime level: std.log.Level,
+    comptime scope: @TypeOf(.EnumLiteral),
+    comptime format: []const u8,
+    args: anytype,
+) void {
+    // const scope_prefix = "(" ++ @tagName(scope) ++ "): ";
+    // const prefix = "[" ++ @tagName(level) ++ "] " ++ scope_prefix;
+    // nosuspend CWriter.print(prefix ++ format ++ "\n", args) catch return;
+    // @panic(prefix ++ format ++ "\n");
+
+    const level_txt = "[" ++ switch (level) {
+        .emerg => "emergency",
+        .alert => "alert",
+        .crit => "critical",
+        .err => "error",
+        .warn => "warning",
+        .notice => "notice",
+        .info => "info",
+        .debug => "debug",
+    } ++ "]";
+    const prefix2 = if (scope == .default) ": " else "(" ++ @tagName(scope) ++ "): ";
+    const writer = if(@enumToInt(level) <= @enumToInt(std.log.Level.notice)) AWriter else DWriter;
+    nosuspend writer.print(level_txt ++ prefix2 ++ format ++ "\n", args) catch return;
+
+}
+
+fn putcharWrite(context: void, data: []const u8) error{}!usize {
+    for(data) |d| c.putchar(d);
+    return data.len;
+}
+fn debugWrite(context: void, data: []const u8) error{}!usize {
+    const port: u16 = 0xE9;
+    for(data) |d| {
+        asm volatile ("outb %%al, %%dx" :: [d] "{al}" (d), [port] "{dx}" (port) : "memory");
+    }
+    return data.len;
+}
+fn logWrite(context: void, data: []const u8) error{}!usize {
+    _ = try putcharWrite(context, data);
+    _ = try debugWrite(context, data);
+    return data.len;
+}
+
+const CWriter = std.io.Writer(void, error{}, putcharWrite){.context = undefined};
+const DWriter = std.io.Writer(void, error{}, debugWrite){.context = undefined};
+const AWriter = std.io.Writer(void, error{}, logWrite){.context = undefined};

kernel/src/main.zig

@@ -1,9 +1,28 @@
 const std = @import("std");
 const builtin = @import("builtin");
+const debug = @import("debug.zig");
+const kalloc = @import("allocator/kalloc.zig");
 
-pub const c_alloc = @import("allocator/calloc.zig");
+pub fn panic(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace) noreturn {
+    debug.zigpanic(msg, error_return_trace);
+}
+
+pub const log_level = .debug;
+pub fn log(
+    comptime level: std.log.Level,
+    comptime scope: @TypeOf(.EnumLiteral),
+    comptime format: []const u8,
+    args: anytype,
+) void {
+    return debug.log(level, scope, format, args);
+}
+
+comptime {
+    _ = debug;
+}
 
 const c = @cImport({
+    @cInclude("hal/debug.h");
     @cInclude("hal/print.h");
     @cInclude("print/print.h");
     @cInclude("hal/ops.h");
@@ -12,41 +31,13 @@ const c = @cImport({
     }
 });
 
-
-
-// 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!\n";
-    const message: [*:0]const u8 = "hello, zig!";
     std.log.info("All your codebase are belong to us.", .{});
-    c.puts(message);
+    c.puts("zig ee\n");
-    c_alloc.kallocNop();
 
-    var buffer: [32]u8 = undefined;
+    kalloc.kallocNop();
-    var alloc = std.heap.FixedBufferAllocator.init(&buffer);
+
-    var buf = alloc.allocator.alloc(u8, 40) catch unreachable;
+    // @panic("ee");
 
 }