feat: Implement Mirai kernel with boot parameter handling and framebuffer support

1 files changed, 92 insertions, 0 deletions

diff --git a/mirai/kernel/boot.zig b/mirai/kernel/boot.zig
new file mode 100644
index 0000000..8d46901
--- /dev/null
+++ b/mirai/kernel/boot.zig
@@ -0,0 +1,92 @@
+//! Mirai Boot Parameters
+//!
+//! This structure matches what Hikari bootloader passes to the kernel.
+
+pub const boot_params_magic: u64 = 0x494152494D424B41; // "AKBMIRAI"
+pub const boot_params_version: u32 = 1;
+
+pub const BootParams = extern struct {
+    magic: u64,
+    version: u32,
+    size: u32,
+
+    framebuffer: FramebufferInfo,
+    memory_map: MemoryMapInfo,
+    kernel: KernelInfo,
+    acpi: AcpiInfo,
+    boot_time: u64,
+
+    reserved: [256]u8,
+
+    pub fn is_valid(self: *const BootParams) bool {
+        return self.magic == boot_params_magic and
+            self.version == boot_params_version;
+    }
+};
+
+pub const FramebufferInfo = extern struct {
+    base: u64,
+    size: u64,
+    width: u32,
+    height: u32,
+    stride: u32,
+    pixel_format: PixelFormat,
+    red_mask_size: u8,
+    red_mask_shift: u8,
+    green_mask_size: u8,
+    green_mask_shift: u8,
+    blue_mask_size: u8,
+    blue_mask_shift: u8,
+    reserved: [2]u8,
+};
+
+pub const PixelFormat = enum(u32) {
+    rgb = 0,
+    bgr = 1,
+    bitmask = 2,
+    unknown = 255,
+};
+
+pub const MemoryMapInfo = extern struct {
+    entries: u64,
+    entry_count: u32,
+    entry_size: u32,
+    descriptor_version: u32,
+    reserved: u32,
+};
+
+pub const MemoryRegion = extern struct {
+    base: u64,
+    size: u64,
+    region_type: MemoryType,
+    attributes: u64,
+};
+
+pub const MemoryType = enum(u32) {
+    usable = 0,
+    reserved = 1,
+    acpi_reclaimable = 2,
+    acpi_nvs = 3,
+    bad_memory = 4,
+    bootloader_reclaimable = 5,
+    kernel = 6,
+    framebuffer = 7,
+};
+
+pub const KernelInfo = extern struct {
+    physical_base: u64,
+    virtual_base: u64,
+    size: u64,
+    entry_point: u64,
+    pml4_address: u64,
+    physmap_base: u64,
+    physmap_size: u64,
+    stack_top: u64,
+    stack_size: u64,
+};
+
+pub const AcpiInfo = extern struct {
+    rsdp_address: u64,
+    rsdp_version: u32,
+    reserved: u32,
+};