efi_loader: Add GOP support

The EFI standard defines a simple boot protocol that an EFI payload can use
to access video output.

This patch adds support to expose exactly that one (and the mode already in
use) as possible graphical configuration to an EFI payload.

With this, I can successfully run grub2 with graphical output.

Signed-off-by: Alexander Graf <agraf@suse.de>

cmd/bootefi.c

@@ -141,6 +141,9 @@ static unsigned long do_bootefi_exec(void *efi)
 #ifdef CONFIG_PARTITIONS
 	efi_disk_register();
 #endif
+#ifdef CONFIG_LCD
+	efi_gop_register();
+#endif
 
 	/* Call our payload! */
 #ifdef DEBUG_EFI

include/efi_api.h

@@ -365,4 +365,51 @@ struct efi_console_control_protocol
 			uint16_t *password);
 };
 
+#define EFI_GOP_GUID \
+	EFI_GUID(0x9042a9de, 0x23dc, 0x4a38, \
+		 0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a)
+
+#define EFI_GOT_RGBA8		0
+#define EFI_GOT_BGRA8		1
+#define EFI_GOT_BITMASK		2
+
+struct efi_gop_mode_info
+{
+	u32 version;
+	u32 width;
+	u32 height;
+	u32 pixel_format;
+	u32 pixel_bitmask[4];
+	u32 pixels_per_scanline;
+};
+
+struct efi_gop_mode
+{
+	u32 max_mode;
+	u32 mode;
+	struct efi_gop_mode_info *info;
+	unsigned long info_size;
+	efi_physical_addr_t fb_base;
+	unsigned long fb_size;
+};
+
+#define EFI_BLT_VIDEO_FILL		0
+#define EFI_BLT_VIDEO_TO_BLT_BUFFER	1
+#define EFI_BLT_BUFFER_TO_VIDEO		2
+#define EFI_BLT_VIDEO_TO_VIDEO		3
+
+struct efi_gop
+{
+	efi_status_t (EFIAPI *query_mode)(struct efi_gop *this, u32 mode_number,
+					  unsigned long *size_of_info,
+					  struct efi_gop_mode_info **info);
+	efi_status_t (EFIAPI *set_mode)(struct efi_gop *this, u32 mode_number);
+	efi_status_t (EFIAPI *blt)(struct efi_gop *this, void *buffer,
+				   unsigned long operation, unsigned long sx,
+				   unsigned long sy, unsigned long dx,
+				   unsigned long dy, unsigned long width,
+				   unsigned long height, unsigned long delta);
+	struct efi_gop_mode *mode;
+};
+
 #endif

include/efi_loader.h

@@ -89,6 +89,8 @@ extern struct list_head efi_obj_list;
 
 /* Called by bootefi to make all disk storage accessible as EFI objects */
 int efi_disk_register(void);
+/* Called by bootefi to make GOP (graphical) interface available */
+int efi_gop_register(void);
 /*
  * Stub implementation for a protocol opener that just returns the handle as
  * interface

lib/efi_loader/Makefile

@@ -9,4 +9,5 @@
 
 obj-y += efi_image_loader.o efi_boottime.o efi_runtime.o efi_console.o
 obj-y += efi_memory.o
+obj-$(CONFIG_LCD) += efi_gop.o
 obj-$(CONFIG_PARTITIONS) += efi_disk.o

lib/efi_loader/efi_gop.c

@@ -0,0 +1,152 @@
+/*
+ *  EFI application disk support
+ *
+ *  Copyright (c) 2016 Alexander Graf
+ *
+ *  SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+#include <inttypes.h>
+#include <lcd.h>
+#include <malloc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const efi_guid_t efi_gop_guid = EFI_GOP_GUID;
+
+struct efi_gop_obj {
+	/* Generic EFI object parent class data */
+	struct efi_object parent;
+	/* EFI Interface callback struct for gop */
+	struct efi_gop ops;
+	/* The only mode we support */
+	struct efi_gop_mode_info info;
+	struct efi_gop_mode mode;
+};
+
+static efi_status_t EFIAPI gop_query_mode(struct efi_gop *this, u32 mode_number,
+					  unsigned long *size_of_info,
+					  struct efi_gop_mode_info **info)
+{
+	struct efi_gop_obj *gopobj;
+
+	EFI_ENTRY("%p, %x, %p, %p", this, mode_number, size_of_info, info);
+
+	gopobj = container_of(this, struct efi_gop_obj, ops);
+	*size_of_info = sizeof(gopobj->info);
+	*info = &gopobj->info;
+
+	return EFI_EXIT(EFI_SUCCESS);
+}
+
+static efi_status_t EFIAPI gop_set_mode(struct efi_gop *this, u32 mode_number)
+{
+	EFI_ENTRY("%p, %x", this, mode_number);
+
+	if (mode_number != 0)
+		return EFI_EXIT(EFI_INVALID_PARAMETER);
+
+	return EFI_EXIT(EFI_SUCCESS);
+}
+
+static efi_status_t EFIAPI gop_blt(struct efi_gop *this, void *buffer,
+				   unsigned long operation, unsigned long sx,
+				   unsigned long sy, unsigned long dx,
+				   unsigned long dy, unsigned long width,
+				   unsigned long height, unsigned long delta)
+{
+	int i, j, line_len16, line_len32;
+	void *fb;
+
+	EFI_ENTRY("%p, %p, %lx, %lx, %lx, %lx, %lx, %lx, %lx, %lx", this,
+		  buffer, operation, sx, sy, dx, dy, width, height, delta);
+
+	if (operation != EFI_BLT_BUFFER_TO_VIDEO)
+		return EFI_EXIT(EFI_INVALID_PARAMETER);
+
+	fb = (void*)gd->fb_base;
+	line_len16 = panel_info.vl_col * sizeof(u16);
+	line_len32 = panel_info.vl_col * sizeof(u32);
+
+	/* Copy the contents line by line */
+
+	switch (panel_info.vl_bpix) {
+	case LCD_COLOR32:
+		for (i = 0; i < height; i++) {
+			u32 *dest = fb + ((i + dy)  * line_len32) +
+					 (dx * sizeof(u32));
+			u32 *src = buffer + ((i + sy)  * line_len32) +
+					 (sx * sizeof(u32));
+
+			/* Same color format, just memcpy */
+			memcpy(dest, src, width * sizeof(u32));
+		}
+		break;
+	case LCD_COLOR16:
+		for (i = 0; i < height; i++) {
+			u16 *dest = fb + ((i + dy)  * line_len16) +
+					 (dx * sizeof(u16));
+			u32 *src = buffer + ((i + sy)  * line_len32) +
+					 (sx * sizeof(u32));
+
+			/* Convert from rgb888 to rgb565 */
+			for (j = 0; j < width; j++) {
+				u32 rgb888 = src[j];
+				dest[j] = ((((rgb888 >> (16 + 3)) & 0x1f) << 11) |
+					   (((rgb888 >> (8 + 2)) & 0x3f) << 5) |
+					   (((rgb888 >> (0 + 3)) & 0x1f) << 0));
+			}
+		}
+		break;
+	}
+
+	lcd_sync();
+
+	return EFI_EXIT(EFI_SUCCESS);
+}
+
+/* This gets called from do_bootefi_exec(). */
+int efi_gop_register(void)
+{
+	struct efi_gop_obj *gopobj;
+	int line_len;
+
+	switch (panel_info.vl_bpix) {
+	case LCD_COLOR32:
+	case LCD_COLOR16:
+		break;
+	default:
+		/* So far, we only work in 16 or 32 bit mode */
+		return -1;
+	}
+
+	gopobj = calloc(1, sizeof(*gopobj));
+
+	/* Fill in object data */
+	gopobj->parent.protocols[0].guid = &efi_gop_guid;
+	gopobj->parent.protocols[0].open = efi_return_handle;
+	gopobj->parent.handle = &gopobj->ops;
+	gopobj->ops.query_mode = gop_query_mode;
+	gopobj->ops.set_mode = gop_set_mode;
+	gopobj->ops.blt = gop_blt;
+	gopobj->ops.mode = &gopobj->mode;
+
+	gopobj->mode.max_mode = 1;
+	gopobj->mode.info = &gopobj->info;
+	gopobj->mode.info_size = sizeof(gopobj->info);
+	gopobj->mode.fb_base = gd->fb_base;
+	gopobj->mode.fb_size = lcd_get_size(&line_len);
+
+	gopobj->info.version = 0;
+	gopobj->info.width = panel_info.vl_col;
+	gopobj->info.height = panel_info.vl_row;
+	gopobj->info.pixel_format = EFI_GOT_RGBA8;
+	gopobj->info.pixels_per_scanline = panel_info.vl_col;
+
+	/* Hook up to the device list */
+	list_add_tail(&gopobj->parent.link, &efi_obj_list);
+
+	return 0;
+}