From dbe50063b0f78ecbcb14ade65e16c5c74ad9abe1 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Thu, 10 Sep 2026 07:17:15 +0200
Subject: feat: basic framebuffer

---
 boot/limine.zig | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'boot/limine.zig')

diff --git a/boot/limine.zig b/boot/limine.zig
index e9aac9c..ef08867 100644
--- a/boot/limine.zig
+++ b/boot/limine.zig
@@ -25,3 +25,44 @@ 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 };
+}
+
+// --- Framebuffer feature: ask Limine for a linear framebuffer ---
+
+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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