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//! Multiboot framebuffer parser
const serial = @import("../../drivers/serial/serial.zig");
const types = @import("types.zig");
var saved: ?types.FramebufferInfo = null;
pub fn parse(addr: u64) ?types.FramebufferInfo {
const total_size = @as(*u32, @ptrFromInt(addr)).*;
var offset: u64 = 8;
while (offset < total_size) {
const tag_addr = addr + offset;
const tag_type = @as(*u32, @ptrFromInt(tag_addr)).*;
const tag_size = @as(*u32, @ptrFromInt(tag_addr + 4)).*;
if (tag_type == 0) break;
if (tag_type == 8) {
const info = types.FramebufferInfo{
.addr = @as(*u64, @ptrFromInt(tag_addr + 8)).*,
.pitch = @as(*u32, @ptrFromInt(tag_addr + 16)).*,
.width = @as(*u32, @ptrFromInt(tag_addr + 20)).*,
.height = @as(*u32, @ptrFromInt(tag_addr + 24)).*,
.bpp = @as(*u8, @ptrFromInt(tag_addr + 28)).*,
.framebuffer_type = @as(*u8, @ptrFromInt(tag_addr + 29)).*,
};
serial.printf("Framebuffer: {x} {}x{} pitch={} bpp={}\n", .{
info.addr, info.width, info.height, info.pitch, info.bpp,
});
return info;
}
offset += (tag_size + 7) & ~@as(u64, 7);
}
return null;
}
pub fn set(fb: types.FramebufferInfo) void {
saved = fb;
}
pub fn get() ?types.FramebufferInfo {
return saved;
}
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