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u-boot/lib/efi_loader/efi_gop.c
Simon Glass a75cf70d23 efi: Correct handling of frame buffer 
The efi_gop driver uses private fields from the video uclass to obtain a
pointer to the frame buffer. Use the platform data instead.

Check the VIDEO_COPY setting to determine which frame buffer to use. Once
the next stage is running (and making use of U-Boot's EFI boot services)
U-Boot does not handle copying from priv->fb to the hardware framebuffer,
so we must allow EFI to write directly to the hardware framebuffer.

We could provide a function to read this, but it seems better to just
document how it works. The original change ignored an explicit comment
in the video.h file ("Things that are private to the uclass: don't use
these in the driver") which is why this was missed when the VIDEO_COPY
feature was added.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 8f661a5b66 ("efi_loader: gop: Expose fb when 32bpp")
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2023-11-14 20:04:00 -07:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* EFI application disk support
*
* Copyright (c) 2016 Alexander Graf
*/
#include <common.h>
#include <dm.h>
#include <efi_loader.h>
#include <log.h>
#include <malloc.h>
#include <mapmem.h>
#include <video.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
static const efi_guid_t efi_gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
/**
* struct efi_gop_obj - graphical output protocol object
*
* @header: EFI object header
* @ops: graphical output protocol interface
* @info: graphical output mode information
* @mode: graphical output mode
* @bpix: bits per pixel
* @fb: frame buffer
*/
struct efi_gop_obj {
struct efi_object header;
struct efi_gop ops;
struct efi_gop_mode_info info;
struct efi_gop_mode mode;
/* Fields we only have access to during init */
u32 bpix;
void *fb;
};
static efi_status_t EFIAPI gop_query_mode(struct efi_gop *this, u32 mode_number,
efi_uintn_t *size_of_info,
struct efi_gop_mode_info **info)
{
struct efi_gop_obj *gopobj;
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p, %x, %p, %p", this, mode_number, size_of_info, info);
if (!this || !size_of_info || !info || mode_number) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
gopobj = container_of(this, struct efi_gop_obj, ops);
ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, sizeof(gopobj->info),
(void **)info);
if (ret != EFI_SUCCESS)
goto out;
*size_of_info = sizeof(gopobj->info);
memcpy(*info, &gopobj->info, sizeof(gopobj->info));
out:
return EFI_EXIT(ret);
}
static __always_inline struct efi_gop_pixel efi_vid30_to_blt_col(u32 vid)
{
struct efi_gop_pixel blt = {
.reserved = 0,
};
blt.blue = (vid & 0x3ff) >> 2;
vid >>= 10;
blt.green = (vid & 0x3ff) >> 2;
vid >>= 10;
blt.red = (vid & 0x3ff) >> 2;
return blt;
}
static __always_inline u32 efi_blt_col_to_vid30(struct efi_gop_pixel *blt)
{
return (u32)(blt->red << 2) << 20 |
(u32)(blt->green << 2) << 10 |
(u32)(blt->blue << 2);
}
static __always_inline struct efi_gop_pixel efi_vid16_to_blt_col(u16 vid)
{
struct efi_gop_pixel blt = {
.reserved = 0,
};
blt.blue = (vid & 0x1f) << 3;
vid >>= 5;
blt.green = (vid & 0x3f) << 2;
vid >>= 6;
blt.red = (vid & 0x1f) << 3;
return blt;
}
static __always_inline u16 efi_blt_col_to_vid16(struct efi_gop_pixel *blt)
{
return (u16)(blt->red >> 3) << 11 |
(u16)(blt->green >> 2) << 5 |
(u16)(blt->blue >> 3);
}
static __always_inline efi_status_t gop_blt_int(struct efi_gop *this,
struct efi_gop_pixel *bufferp,
u32 operation, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy,
efi_uintn_t width,
efi_uintn_t height,
efi_uintn_t delta,
efi_uintn_t vid_bpp)
{
struct efi_gop_obj *gopobj = container_of(this, struct efi_gop_obj, ops);
efi_uintn_t i, j, linelen, slineoff = 0, dlineoff, swidth, dwidth;
u32 *fb32 = gopobj->fb;
u16 *fb16 = gopobj->fb;
struct efi_gop_pixel *buffer = __builtin_assume_aligned(bufferp, 4);
if (delta) {
/* Check for 4 byte alignment */
if (delta & 3)
return EFI_INVALID_PARAMETER;
linelen = delta >> 2;
} else {
linelen = width;
}
/* Check source rectangle */
switch (operation) {
case EFI_BLT_VIDEO_FILL:
break;
case EFI_BLT_BUFFER_TO_VIDEO:
if (sx + width > linelen)
return EFI_INVALID_PARAMETER;
break;
case EFI_BLT_VIDEO_TO_BLT_BUFFER:
case EFI_BLT_VIDEO_TO_VIDEO:
if (sx + width > gopobj->info.width ||
sy + height > gopobj->info.height)
return EFI_INVALID_PARAMETER;
break;
default:
return EFI_INVALID_PARAMETER;
}
/* Check destination rectangle */
switch (operation) {
case EFI_BLT_VIDEO_FILL:
case EFI_BLT_BUFFER_TO_VIDEO:
case EFI_BLT_VIDEO_TO_VIDEO:
if (dx + width > gopobj->info.width ||
dy + height > gopobj->info.height)
return EFI_INVALID_PARAMETER;
break;
case EFI_BLT_VIDEO_TO_BLT_BUFFER:
if (dx + width > linelen)
return EFI_INVALID_PARAMETER;
break;
}
/* Calculate line width */
switch (operation) {
case EFI_BLT_BUFFER_TO_VIDEO:
swidth = linelen;
break;
case EFI_BLT_VIDEO_TO_BLT_BUFFER:
case EFI_BLT_VIDEO_TO_VIDEO:
swidth = gopobj->info.width;
if (!vid_bpp)
return EFI_UNSUPPORTED;
break;
case EFI_BLT_VIDEO_FILL:
swidth = 0;
break;
}
switch (operation) {
case EFI_BLT_BUFFER_TO_VIDEO:
case EFI_BLT_VIDEO_FILL:
case EFI_BLT_VIDEO_TO_VIDEO:
dwidth = gopobj->info.width;
if (!vid_bpp)
return EFI_UNSUPPORTED;
break;
case EFI_BLT_VIDEO_TO_BLT_BUFFER:
dwidth = linelen;
break;
}
slineoff = swidth * sy;
dlineoff = dwidth * dy;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
struct efi_gop_pixel pix;
/* Read source pixel */
switch (operation) {
case EFI_BLT_VIDEO_FILL:
pix = *buffer;
break;
case EFI_BLT_BUFFER_TO_VIDEO:
pix = buffer[slineoff + j + sx];
break;
case EFI_BLT_VIDEO_TO_BLT_BUFFER:
case EFI_BLT_VIDEO_TO_VIDEO:
if (vid_bpp == 32)
pix = *(struct efi_gop_pixel *)&fb32[
slineoff + j + sx];
else if (vid_bpp == 30)
pix = efi_vid30_to_blt_col(fb32[
slineoff + j + sx]);
else
pix = efi_vid16_to_blt_col(fb16[
slineoff + j + sx]);
break;
}
/* Write destination pixel */
switch (operation) {
case EFI_BLT_VIDEO_TO_BLT_BUFFER:
buffer[dlineoff + j + dx] = pix;
break;
case EFI_BLT_BUFFER_TO_VIDEO:
case EFI_BLT_VIDEO_FILL:
case EFI_BLT_VIDEO_TO_VIDEO:
if (vid_bpp == 32)
fb32[dlineoff + j + dx] = *(u32 *)&pix;
else if (vid_bpp == 30)
fb32[dlineoff + j + dx] =
efi_blt_col_to_vid30(&pix);
else
fb16[dlineoff + j + dx] =
efi_blt_col_to_vid16(&pix);
break;
}
}
slineoff += swidth;
dlineoff += dwidth;
}
return EFI_SUCCESS;
}
static efi_uintn_t gop_get_bpp(struct efi_gop *this)
{
struct efi_gop_obj *gopobj = container_of(this, struct efi_gop_obj, ops);
efi_uintn_t vid_bpp = 0;
switch (gopobj->bpix) {
case VIDEO_BPP32:
if (gopobj->info.pixel_format == EFI_GOT_BGRA8)
vid_bpp = 32;
else
vid_bpp = 30;
break;
case VIDEO_BPP16:
vid_bpp = 16;
break;
}
return vid_bpp;
}
/*
* GCC can't optimize our BLT function well, but we need to make sure that
* our 2-dimensional loop gets executed very quickly, otherwise the system
* will feel slow.
*
* By manually putting all obvious branch targets into functions which call
* our generic BLT function with constants, the compiler can successfully
* optimize for speed.
*/
static efi_status_t gop_blt_video_fill(struct efi_gop *this,
struct efi_gop_pixel *buffer,
u32 foo, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy, efi_uintn_t width,
efi_uintn_t height, efi_uintn_t delta,
efi_uintn_t vid_bpp)
{
return gop_blt_int(this, buffer, EFI_BLT_VIDEO_FILL, sx, sy, dx,
dy, width, height, delta, vid_bpp);
}
static efi_status_t gop_blt_buf_to_vid16(struct efi_gop *this,
struct efi_gop_pixel *buffer,
u32 foo, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy, efi_uintn_t width,
efi_uintn_t height, efi_uintn_t delta)
{
return gop_blt_int(this, buffer, EFI_BLT_BUFFER_TO_VIDEO, sx, sy, dx,
dy, width, height, delta, 16);
}
static efi_status_t gop_blt_buf_to_vid30(struct efi_gop *this,
struct efi_gop_pixel *buffer,
u32 foo, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy, efi_uintn_t width,
efi_uintn_t height, efi_uintn_t delta)
{
return gop_blt_int(this, buffer, EFI_BLT_BUFFER_TO_VIDEO, sx, sy, dx,
dy, width, height, delta, 30);
}
static efi_status_t gop_blt_buf_to_vid32(struct efi_gop *this,
struct efi_gop_pixel *buffer,
u32 foo, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy, efi_uintn_t width,
efi_uintn_t height, efi_uintn_t delta)
{
return gop_blt_int(this, buffer, EFI_BLT_BUFFER_TO_VIDEO, sx, sy, dx,
dy, width, height, delta, 32);
}
static efi_status_t gop_blt_vid_to_vid(struct efi_gop *this,
struct efi_gop_pixel *buffer,
u32 foo, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy, efi_uintn_t width,
efi_uintn_t height, efi_uintn_t delta,
efi_uintn_t vid_bpp)
{
return gop_blt_int(this, buffer, EFI_BLT_VIDEO_TO_VIDEO, sx, sy, dx,
dy, width, height, delta, vid_bpp);
}
static efi_status_t gop_blt_vid_to_buf(struct efi_gop *this,
struct efi_gop_pixel *buffer,
u32 foo, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy, efi_uintn_t width,
efi_uintn_t height, efi_uintn_t delta,
efi_uintn_t vid_bpp)
{
return gop_blt_int(this, buffer, EFI_BLT_VIDEO_TO_BLT_BUFFER, sx, sy,
dx, dy, width, height, delta, vid_bpp);
}
/**
* gop_set_mode() - set graphical output mode
*
* This function implements the SetMode() service.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* @this: the graphical output protocol
* @mode_number: the mode to be set
* Return: status code
*/
static efi_status_t EFIAPI gop_set_mode(struct efi_gop *this, u32 mode_number)
{
struct efi_gop_obj *gopobj;
struct efi_gop_pixel buffer = {0, 0, 0, 0};
efi_uintn_t vid_bpp;
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p, %x", this, mode_number);
if (!this) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
if (mode_number) {
ret = EFI_UNSUPPORTED;
goto out;
}
gopobj = container_of(this, struct efi_gop_obj, ops);
vid_bpp = gop_get_bpp(this);
ret = gop_blt_video_fill(this, &buffer, EFI_BLT_VIDEO_FILL, 0, 0, 0, 0,
gopobj->info.width, gopobj->info.height, 0,
vid_bpp);
out:
return EFI_EXIT(ret);
}
/*
* Copy rectangle.
*
* This function implements the Blt service of the EFI_GRAPHICS_OUTPUT_PROTOCOL.
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* @this: EFI_GRAPHICS_OUTPUT_PROTOCOL
* @buffer: pixel buffer
* @sx: source x-coordinate
* @sy: source y-coordinate
* @dx: destination x-coordinate
* @dy: destination y-coordinate
* @width: width of rectangle
* @height: height of rectangle
* @delta: length in bytes of a line in the pixel buffer (optional)
* Return: status code
*/
static efi_status_t EFIAPI gop_blt(struct efi_gop *this,
struct efi_gop_pixel *buffer,
u32 operation, efi_uintn_t sx,
efi_uintn_t sy, efi_uintn_t dx,
efi_uintn_t dy, efi_uintn_t width,
efi_uintn_t height, efi_uintn_t delta)
{
efi_status_t ret = EFI_INVALID_PARAMETER;
efi_uintn_t vid_bpp;
EFI_ENTRY("%p, %p, %u, %zu, %zu, %zu, %zu, %zu, %zu, %zu", this,
buffer, operation, sx, sy, dx, dy, width, height, delta);
vid_bpp = gop_get_bpp(this);
/* Allow for compiler optimization */
switch (operation) {
case EFI_BLT_VIDEO_FILL:
ret = gop_blt_video_fill(this, buffer, operation, sx, sy, dx,
dy, width, height, delta, vid_bpp);
break;
case EFI_BLT_BUFFER_TO_VIDEO:
/* This needs to be super-fast, so duplicate for 16/32bpp */
if (vid_bpp == 32)
ret = gop_blt_buf_to_vid32(this, buffer, operation, sx,
sy, dx, dy, width, height,
delta);
else if (vid_bpp == 30)
ret = gop_blt_buf_to_vid30(this, buffer, operation, sx,
sy, dx, dy, width, height,
delta);
else
ret = gop_blt_buf_to_vid16(this, buffer, operation, sx,
sy, dx, dy, width, height,
delta);
break;
case EFI_BLT_VIDEO_TO_VIDEO:
ret = gop_blt_vid_to_vid(this, buffer, operation, sx, sy, dx,
dy, width, height, delta, vid_bpp);
break;
case EFI_BLT_VIDEO_TO_BLT_BUFFER:
ret = gop_blt_vid_to_buf(this, buffer, operation, sx, sy, dx,
dy, width, height, delta, vid_bpp);
break;
default:
ret = EFI_INVALID_PARAMETER;
}
if (ret != EFI_SUCCESS)
return EFI_EXIT(ret);
video_sync_all();
return EFI_EXIT(EFI_SUCCESS);
}
/*
* Install graphical output protocol.
*
* If no supported video device exists this is not considered as an
* error.
*/
efi_status_t efi_gop_register(void)
{
struct efi_gop_obj *gopobj;
u32 bpix, format, col, row;
u64 fb_base, fb_size;
efi_status_t ret;
struct udevice *vdev;
struct video_priv *priv;
struct video_uc_plat *plat;
/* We only support a single video output device for now */
if (uclass_first_device_err(UCLASS_VIDEO, &vdev)) {
debug("WARNING: No video device\n");
return EFI_SUCCESS;
}
priv = dev_get_uclass_priv(vdev);
bpix = priv->bpix;
format = priv->format;
col = video_get_xsize(vdev);
row = video_get_ysize(vdev);
plat = dev_get_uclass_plat(vdev);
fb_base = IS_ENABLED(CONFIG_VIDEO_COPY) ? plat->copy_base : plat->base;
fb_size = plat->size;
switch (bpix) {
case VIDEO_BPP16:
case VIDEO_BPP32:
break;
default:
/* So far, we only work in 16 or 32 bit mode */
debug("WARNING: Unsupported video mode\n");
return EFI_SUCCESS;
}
gopobj = calloc(1, sizeof(*gopobj));
if (!gopobj) {
printf("ERROR: Out of memory\n");
return EFI_OUT_OF_RESOURCES;
}
/* Hook up to the device list */
efi_add_handle(&gopobj->header);
/* Fill in object data */
ret = efi_add_protocol(&gopobj->header, &efi_gop_guid,
&gopobj->ops);
if (ret != EFI_SUCCESS) {
printf("ERROR: Failure adding GOP protocol\n");
return ret;
}
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 = fb_base;
gopobj->mode.fb_size = fb_size;
gopobj->info.version = 0;
gopobj->info.width = col;
gopobj->info.height = row;
if (bpix == VIDEO_BPP32)
{
if (format == VIDEO_X2R10G10B10) {
gopobj->info.pixel_format = EFI_GOT_BITMASK;
gopobj->info.pixel_bitmask[0] = 0x3ff00000; /* red */
gopobj->info.pixel_bitmask[1] = 0x000ffc00; /* green */
gopobj->info.pixel_bitmask[2] = 0x000003ff; /* blue */
gopobj->info.pixel_bitmask[3] = 0xc0000000; /* reserved */
} else {
gopobj->info.pixel_format = EFI_GOT_BGRA8;
}
} else {
gopobj->info.pixel_format = EFI_GOT_BITMASK;
gopobj->info.pixel_bitmask[0] = 0xf800; /* red */
gopobj->info.pixel_bitmask[1] = 0x07e0; /* green */
gopobj->info.pixel_bitmask[2] = 0x001f; /* blue */
}
gopobj->info.pixels_per_scanline = col;
gopobj->bpix = bpix;
gopobj->fb = map_sysmem(fb_base, fb_size);
return EFI_SUCCESS;
}
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