Let there be GOP

stage23/drivers/gop.c

@@ -3,17 +3,50 @@
 #include <efi.h>
 #include <lib/blib.h>
 #include <drivers/gop.h>
+#include <lib/print.h>
+
+// Most of this code taken from https://wiki.osdev.org/GOP
 
 bool init_gop(struct fb_info *ret,
               uint16_t target_width, uint16_t target_height, uint16_t target_bpp) {
     (void)ret; (void)target_width; (void)target_height; (void)target_bpp;
 
+    EFI_STATUS status;
+
     EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
     EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
 
     uefi_call_wrapper(gBS->LocateProtocol, 3, &gop_guid, NULL, (void **)&gop);
 
-    for (;;);
+    EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info;
+    UINTN mode_info_size, native_mode, modes_count;
+
+    status = uefi_call_wrapper(gop->QueryMode, 4, gop,
+                               gop->Mode == NULL ? 0 : gop->Mode->Mode,
+                               &mode_info_size, &mode_info);
+
+    if (status == EFI_NOT_STARTED) {
+        status = uefi_call_wrapper(gop->SetMode, 2, gop, 0);
+    }
+
+    if (EFI_ERROR(status)) {
+        panic("GOP initialisation failed");
+    }
+
+    ret->memory_model = 0x06;
+    ret->framebuffer_addr = gop->Mode->FrameBufferBase;
+    ret->framebuffer_pitch = (gop->Mode->Info->PixelsPerScanLine * 4);
+    ret->framebuffer_width = gop->Mode->Info->HorizontalResolution;
+    ret->framebuffer_height = gop->Mode->Info->VerticalResolution;
+    ret->framebuffer_bpp = 32;
+    ret->red_mask_size = 8;
+    ret->red_mask_shift = 16;
+    ret->green_mask_size = 8;
+    ret->green_mask_shift = 8;
+    ret->blue_mask_size = 8;
+    ret->blue_mask_shift = 0;
+
+    return true;
 }
 
 #endif

stage23/lib/gterm.c

@@ -24,7 +24,7 @@ static uint16_t  gterm_bpp;
 
 extern symbol _binary_font_bin_start;
 
-static uint8_t *vga_font = (void *)_binary_font_bin_start;
+static uint8_t *vga_font;
 
 static uint32_t ansi_colours[8];
 
@@ -372,6 +372,8 @@ bool gterm_init(int *_rows, int *_cols, uint32_t *_colours, int _margin, int _ma
     mtrr_set_range((uint64_t)(size_t)gterm_framebuffer,
                    (uint64_t)gterm_pitch * gterm_height, MTRR_MEMORY_TYPE_WC);
 
+    vga_font = (void *)_binary_font_bin_start;
+
     char *menu_font = config_get_value(NULL, 0, "MENU_FONT");
     if (menu_font != NULL) {
         struct file_handle f;

test/limine.cfg

@@ -1,9 +1,8 @@
 DEFAULT_ENTRY=2
-TIMEOUT=3
+TIMEOUT=no
 GRAPHICS=yes
 MENU_RESOLUTION=1024x768
 MENU_FONT=boot:///boot/font.bin
-E9_OUTPUT=yes
 
 THEME_COLOURS=60000000;aa0000;00aaff;aa5500;0000aa;aa00aa;9076de;aaaaaa
 THEME_MARGIN=64