1 files changed, 54 insertions, 0 deletions

diff --git a/src/ppu.c b/src/ppu.c
new file mode 100644
index 0000000..99574d7
--- /dev/null
+++ b/src/ppu.c
@@ -0,0 +1,54 @@
+#include "common.h"
+
+static u32 *framebuffer = 0;
+
+void
+ppu_init(void) {
+    static MboxFramebufferRequest fb_request = {
+        .buf_size = 96,
+        .code = MBOX_REQUEST,
+        .screen_tag = {
+            .header = {
+                .id = 0x48003,
+                .buf_size = 8,
+            },
+            .width = 1024,
+            .height = 1024,
+        },
+        .virtual_screen_tag = {
+            .header = {
+                .id = 0x48004,
+                .buf_size = 8,
+            },
+            .width = 1024,
+            .height = 1024,
+        },
+        .depth_tag = {
+            .header = {
+                .id = 0x48005,
+                .buf_size = 4,
+            },
+            .depth = 32,
+        },
+        .framebuffer_tag = {
+            .header = {
+                .id = 0x40001,
+                .buf_size = 8,
+            },
+            .fb_addr = 0,
+            .fb_size = 0,
+        }
+    };
+
+    if (mb_call(MBOX_CH_PROP, &fb_request)
+            && fb_request.depth_tag.depth == 32
+            && fb_request.framebuffer_tag.fb_addr != 0) {
+        fb_request.framebuffer_tag.fb_addr &= 0x3FFFFFFF;
+        framebuffer = (u32*)((uintptr_t)fb_request.framebuffer_tag.fb_addr);
+        for (size_t i = 0; i < 1024 * 100; i++) {
+            framebuffer[i] = 0xffaa22; // 0xBBGGRR
+        }
+    } else {
+        uart_puts("Unable initialize framebuffer\n");
+    }
+}