efi: Add video support to the app

The current EFI video driver only works when running in the stub. In that
case the stub calls boot services (before jumping to U-Boot proper) and
copies the graphics info over to the efi table. This is necessary because
the stub exits boot services before jumping to U-Boot.

The app maintains access to boot services throughout its life, so does not
need to do this. Update the driver to support calling boot services
directly.

Enable video output for the app. Note that this uses the
EFI_GRAPHICS_OUTPUT_PROTOCOL protocol, even though it mentions vesa.

A sample qemu command-line for this case is:

   qemu-system-x86_64 -bios /usr/share/edk2.git/ovmf-ia32/OVMF-pure-efi.fd
   -drive id=disk,file=try.img,if=none,format=raw -nic none
   -device ahci,id=ahci -device ide-hd,drive=disk,bus=ahci.0

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

arch/x86/dts/efi-x86_app.dts

@@ -25,4 +25,8 @@
 		compatible = "efi,reset";
 		u-boot,dm-pre-reloc;
 	};
+	efi-fb {
+		compatible = "efi-fb";
+	};
+
 };

board/efi/efi-x86_app/Kconfig

@@ -12,4 +12,8 @@ config SYS_SOC
 config SYS_CONFIG_NAME
 	default "efi-x86_app"
 
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	imply VIDEO_EFI
+
 endif

doc/develop/uefi/u-boot_on_efi.rst

@@ -265,7 +265,7 @@ This work could be extended in a number of ways:
 
 - Figure out how to solve the interrupt problem
 
-- Add more drivers to the application side (e.g. video, block devices, USB,
+- Add more drivers to the application side (e.g. block devices, USB,
   environment access). This would mostly be an academic exercise as a strong
   use case is not readily apparent, but it might be fun.
 

drivers/video/Kconfig

@@ -250,7 +250,7 @@ config VIDEO_COREBOOT
 
 config VIDEO_EFI
 	bool "Enable EFI framebuffer driver support"
-	depends on EFI_STUB
+	depends on EFI_STUB || EFI_APP
 	help
 	  Turn on this option to enable a framebuffeer driver when U-Boot is
 	  loaded as a payload (see README.u-boot_on_efi) by an EFI BIOS where

drivers/video/efi.c

@@ -50,6 +50,28 @@ static void efi_find_pixel_bits(u32 mask, u8 *pos, u8 *size)
 	*size = len;
 }
 
+static int get_mode_info(struct vesa_mode_info *vesa)
+{
+	efi_guid_t efi_gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+	struct efi_boot_services *boot = efi_get_boot();
+	struct efi_gop_mode *mode;
+	struct efi_gop *gop;
+	int ret;
+
+	if (!boot)
+		return log_msg_ret("sys", -ENOSYS);
+	ret = boot->locate_protocol(&efi_gop_guid, NULL, (void **)&gop);
+	if (ret)
+		return log_msg_ret("prot", -ENOTSUPP);
+
+	mode = gop->mode;
+	vesa->phys_base_ptr = mode->fb_base;
+	vesa->x_resolution = mode->info->width;
+	vesa->y_resolution = mode->info->height;
+
+	return 0;
+}
+
 static int save_vesa_mode(struct vesa_mode_info *vesa)
 {
 	struct efi_entry_gopmode *mode;
@@ -57,16 +79,23 @@ static int save_vesa_mode(struct vesa_mode_info *vesa)
 	int size;
 	int ret;
 
-	ret = efi_info_get(EFIET_GOP_MODE, (void **)&mode, &size);
-	if (ret == -ENOENT) {
-		debug("efi graphics output protocol mode not found\n");
-		return -ENXIO;
+	if (IS_ENABLED(CONFIG_EFI_APP)) {
+		ret = get_mode_info(vesa);
+		if (ret) {
+			printf("EFI graphics output protocol not found\n");
+			return -ENXIO;
+		}
+	} else {
+		ret = efi_info_get(EFIET_GOP_MODE, (void **)&mode, &size);
+		if (ret == -ENOENT) {
+			printf("EFI graphics output protocol mode not found\n");
+			return -ENXIO;
+		}
+		vesa->phys_base_ptr = mode->fb_base;
+		vesa->x_resolution = mode->info->width;
+		vesa->y_resolution = mode->info->height;
 	}
 
-	vesa->phys_base_ptr = mode->fb_base;
-	vesa->x_resolution = mode->info->width;
-	vesa->y_resolution = mode->info->height;
-
 	if (mode->info->pixel_format < EFI_GOT_BITMASK) {
 		fbinfo = &efi_framebuffer_format_map[mode->info->pixel_format];
 		vesa->red_mask_size = fbinfo->red.size;

include/configs/efi-x86_app.h

@@ -10,8 +10,8 @@
 
 #undef CONFIG_TPM_TIS_BASE_ADDRESS
 
-#define CONFIG_STD_DEVICES_SETTINGS     "stdin=usbkbd,vga,serial\0" \
-					"stdout=vga,serial\0" \
-					"stderr=vga,serial\0"
+#define CONFIG_STD_DEVICES_SETTINGS	"stdin=serial\0" \
+					"stdout=vidconsole\0" \
+					"stderr=vidconsole\0"
 
 #endif