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// Limine scans the loaded image for these magic numbers,
// BaseRevision is a handshake, essentially we ask limine
// for rev 3, and if it supports it, limine zeros it out
pub const BaseRevision = extern struct {
magic0: u64 = 0xf9562b2d5c95a6c8,
magic1: u64 = 0x6a7b384944536bdc,
revision: u64,
pub fn init(revision: u64) BaseRevision {
return .{ .revision = revision };
}
};
// Bracketing markers, they are pretty optional but when
// we add proper limine requests, having these here comes
// handy
pub const RequestsStartMarker = extern struct {
m0: u64 = 0xf6b8f4b39de7d1ae,
m1: u64 = 0xfab91a6940fcb9cf,
m2: u64 = 0x785c6ed015d3e316,
m3: u64 = 0x181e920a7852b9d9,
};
pub const RequestsEndMarker = extern struct {
m0: u64 = 0xadc0e0531bb10d03,
m1: u64 = 0x9572709f31764c62,
};
// Every request id starts with this common magic, then two request-specific
// words. Limine scans .limine_requests for these and fills in `response`.
fn requestId(a: u64, b: u64) [4]u64 {
return .{ 0xc7b1dd30df4c8b88, 0x0a82e883a194f07b, a, b };
}
// this comes from the limine spec
// you can see it in the header files
pub const Framebuffer = extern struct {
address: [*]u8,
width: u64,
height: u64,
pitch: u64, // bytes per row (not always width*bpp/8)
bpp: u16, // bits per pixel
memory_model: u8, // 1 = RGB
red_mask_size: u8,
red_mask_shift: u8,
green_mask_size: u8,
green_mask_shift: u8,
blue_mask_size: u8,
blue_mask_shift: u8,
// 7 bytes of padding land here (extern-struct alignment before edid_size)
edid_size: u64,
edid: ?*anyopaque,
// response revision 1 and up, unused for now:
mode_count: u64,
modes: ?*anyopaque,
};
pub const FramebufferResponse = extern struct {
revision: u64,
framebuffer_count: u64,
framebuffers: ?[*]*Framebuffer,
};
pub const FramebufferRequest = extern struct {
id: [4]u64 = requestId(0x9d5827dcd881dd75, 0xa3148604f6fab11b),
revision: u64 = 0,
response: ?*FramebufferResponse = null,
};
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