refactor: reorganize kernel structure and implement memory management zonesHEADmain

1 files changed, 111 insertions, 0 deletions

diff --git a/mirai/kernel/entry.zig b/mirai/kernel/entry.zig
new file mode 100644
index 0000000..7d9c9f6
--- /dev/null
+++ b/mirai/kernel/entry.zig
@@ -0,0 +1,111 @@
+//! Kernel Entry
+
+const boot = @import("boot.zig");
+const asm_ops = @import("../asm/asm.zig");
+
+pub const BootParams = boot.BootParams;
+
+pub fn main(boot_params_ptr: *boot.BootParams) noreturn {
+    if (!boot_params_ptr.is_valid()) {
+        if (boot_params_ptr.framebuffer.base != 0) {
+            draw_error_screen(boot_params_ptr);
+        }
+        asm_ops.cpu.halt.halt_loop();
+    }
+
+    draw_boot_screen(boot_params_ptr);
+    asm_ops.cpu.halt.halt_loop();
+}
+
+fn draw_boot_screen(params: *boot.BootParams) void {
+    const fb = params.framebuffer;
+    const base: [*]u32 = @ptrFromInt(fb.base);
+    const stride = fb.stride;
+
+    const bg_color: u32 = switch (fb.pixel_format) {
+        .rgb => 0x1E0030,
+        .bgr => 0x30001E,
+        else => 0x1E0030,
+    };
+
+    var row: u32 = 0;
+    while (row < fb.height) : (row += 1) {
+        var col: u32 = 0;
+        while (col < fb.width) : (col += 1) {
+            base[row * stride + col] = bg_color;
+        }
+    }
+
+    const text_color: u32 = switch (fb.pixel_format) {
+        .rgb => 0x00FFFF,
+        .bgr => 0xFFFF00,
+        else => 0x00FFFF,
+    };
+
+    const banner = [_][]const u8{
+        "   A   K  K  III  BBB    A   ",
+        "  A A  K K    I   B  B  A A  ",
+        " AAAAA KK     I   BBB  AAAAA ",
+        " A   A K K    I   B  B A   A ",
+        " A   A K  K  III  BBB  A   A ",
+    };
+
+    const start_x = (fb.width - 29 * 8) / 2;
+    const start_y = fb.height / 3;
+
+    for (banner, 0..) |line, line_row| {
+        for (line, 0..) |char, line_col| {
+            if (char != ' ') {
+                draw_block(base, stride, start_x + @as(u32, @truncate(line_col)) * 8, start_y + @as(u32, @truncate(line_row)) * 12, text_color);
+            }
+        }
+    }
+
+    const subtitle = "AkibaOS Kernel Loaded Successfully";
+    const subtitle_x = (fb.width - @as(u32, @truncate(subtitle.len)) * 8) / 2;
+    const subtitle_y = start_y + 80;
+
+    for (0..subtitle.len) |idx| {
+        draw_small_block(base, stride, subtitle_x + @as(u32, @truncate(idx)) * 8, subtitle_y, 0xFF80C0);
+    }
+}
+
+fn draw_error_screen(params: *boot.BootParams) void {
+    const fb = params.framebuffer;
+    const base: [*]u32 = @ptrFromInt(fb.base);
+    const stride = fb.stride;
+
+    const error_color: u32 = switch (fb.pixel_format) {
+        .rgb => 0xFF0000,
+        .bgr => 0x0000FF,
+        else => 0xFF0000,
+    };
+
+    var row: u32 = 0;
+    while (row < fb.height) : (row += 1) {
+        var col: u32 = 0;
+        while (col < fb.width) : (col += 1) {
+            base[row * stride + col] = error_color;
+        }
+    }
+}
+
+fn draw_block(base: [*]u32, stride: u32, x_pos: u32, y_pos: u32, color: u32) void {
+    var dy: u32 = 0;
+    while (dy < 10) : (dy += 1) {
+        var dx: u32 = 0;
+        while (dx < 6) : (dx += 1) {
+            base[(y_pos + dy) * stride + x_pos + dx] = color;
+        }
+    }
+}
+
+fn draw_small_block(base: [*]u32, stride: u32, x_pos: u32, y_pos: u32, color: u32) void {
+    var dy: u32 = 0;
+    while (dy < 2) : (dy += 1) {
+        var dx: u32 = 0;
+        while (dx < 6) : (dx += 1) {
+            base[(y_pos + dy) * stride + x_pos + dx] = color;
+        }
+    }
+}