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// SPDX-License-Identifier: GPL-2.0
/* -----------------------------------------------------------------------
*
* Copyright 2011 Intel Corporation; author Matt Fleming
*
* ----------------------------------------------------------------------- */
#include <linux/bitops.h>
#include <linux/ctype.h>
#include <linux/efi.h>
#include <linux/screen_info.h>
#include <linux/string.h>
#include <asm/efi.h>
#include <asm/setup.h>
#include "efistub.h"
enum efi_cmdline_option {
EFI_CMDLINE_NONE,
EFI_CMDLINE_MODE_NUM,
EFI_CMDLINE_RES,
EFI_CMDLINE_AUTO,
EFI_CMDLINE_LIST
};
static struct {
enum efi_cmdline_option option;
union {
u32 mode;
struct {
u32 width, height;
int format;
u8 depth;
} res;
};
} cmdline = { .option = EFI_CMDLINE_NONE };
static bool parse_modenum(char *option, char **next)
{
u32 m;
if (!strstarts(option, "mode="))
return false;
option += strlen("mode=");
m = simple_strtoull(option, &option, 0);
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_MODE_NUM;
cmdline.mode = m;
*next = option;
return true;
}
static bool parse_res(char *option, char **next)
{
u32 w, h, d = 0;
int pf = -1;
if (!isdigit(*option))
return false;
w = simple_strtoull(option, &option, 10);
if (*option++ != 'x' || !isdigit(*option))
return false;
h = simple_strtoull(option, &option, 10);
if (*option == '-') {
option++;
if (strstarts(option, "rgb")) {
option += strlen("rgb");
pf = PIXEL_RGB_RESERVED_8BIT_PER_COLOR;
} else if (strstarts(option, "bgr")) {
option += strlen("bgr");
pf = PIXEL_BGR_RESERVED_8BIT_PER_COLOR;
} else if (isdigit(*option))
d = simple_strtoull(option, &option, 10);
else
return false;
}
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_RES;
cmdline.res.width = w;
cmdline.res.height = h;
cmdline.res.format = pf;
cmdline.res.depth = d;
*next = option;
return true;
}
static bool parse_auto(char *option, char **next)
{
if (!strstarts(option, "auto"))
return false;
option += strlen("auto");
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_AUTO;
*next = option;
return true;
}
static bool parse_list(char *option, char **next)
{
if (!strstarts(option, "list"))
return false;
option += strlen("list");
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_LIST;
*next = option;
return true;
}
void efi_parse_option_graphics(char *option)
{
while (*option) {
if (parse_modenum(option, &option))
continue;
if (parse_res(option, &option))
continue;
if (parse_auto(option, &option))
continue;
if (parse_list(option, &option))
continue;
while (*option && *option++ != ',')
;
}
}
static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode;
int pf;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
if (cmdline.mode == cur_mode)
return cur_mode;
max_mode = efi_table_attr(mode, max_mode);
if (cmdline.mode >= max_mode) {
efi_err("Requested mode is invalid\n");
return cur_mode;
}
status = efi_call_proto(gop, query_mode, cmdline.mode,
&info_size, &info);
if (status != EFI_SUCCESS) {
efi_err("Couldn't get mode information\n");
return cur_mode;
}
pf = info->pixel_format;
efi_bs_call(free_pool, info);
if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX) {
efi_err("Invalid PixelFormat\n");
return cur_mode;
}
return cmdline.mode;
}
static u8 pixel_bpp(int pixel_format, efi_pixel_bitmask_t pixel_info)
{
if (pixel_format == PIXEL_BIT_MASK) {
u32 mask = pixel_info.red_mask | pixel_info.green_mask |
pixel_info.blue_mask | pixel_info.reserved_mask;
if (!mask)
return 0;
return __fls(mask) - __ffs(mask) + 1;
} else
return 32;
}
static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode;
int pf;
efi_pixel_bitmask_t pi;
u32 m, w, h;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
info = efi_table_attr(mode, info);
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
if (w == cmdline.res.width && h == cmdline.res.height &&
(cmdline.res.format < 0 || cmdline.res.format == pf) &&
(!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
return cur_mode;
max_mode = efi_table_attr(mode, max_mode);
for (m = 0; m < max_mode; m++) {
if (m == cur_mode)
continue;
status = efi_call_proto(gop, query_mode, m,
&info_size, &info);
if (status != EFI_SUCCESS)
continue;
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
efi_bs_call(free_pool, info);
if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX)
continue;
if (w == cmdline.res.width && h == cmdline.res.height &&
(cmdline.res.format < 0 || cmdline.res.format == pf) &&
(!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
return m;
}
efi_err("Couldn't find requested mode\n");
return cur_mode;
}
static u32 choose_mode_auto(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode, best_mode, area;
u8 depth;
int pf;
efi_pixel_bitmask_t pi;
u32 m, w, h, a;
u8 d;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
max_mode = efi_table_attr(mode, max_mode);
info = efi_table_attr(mode, info);
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
best_mode = cur_mode;
area = w * h;
depth = pixel_bpp(pf, pi);
for (m = 0; m < max_mode; m++) {
if (m == cur_mode)
continue;
status = efi_call_proto(gop, query_mode, m,
&info_size, &info);
if (status != EFI_SUCCESS)
continue;
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
efi_bs_call(free_pool, info);
if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX)
continue;
a = w * h;
if (a < area)
continue;
d = pixel_bpp(pf, pi);
if (a > area || d > depth) {
best_mode = m;
area = a;
depth = d;
}
}
return best_mode;
}
static u32 choose_mode_list(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode;
int pf;
efi_pixel_bitmask_t pi;
u32 m, w, h;
u8 d;
const char *dstr;
bool valid;
efi_input_key_t key;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
max_mode = efi_table_attr(mode, max_mode);
efi_printk("Available graphics modes are 0-%u\n", max_mode-1);
efi_puts(" * = current mode\n"
" - = unusable mode\n");
for (m = 0; m < max_mode; m++) {
status = efi_call_proto(gop, query_mode, m,
&info_size, &info);
if (status != EFI_SUCCESS)
continue;
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
efi_bs_call(free_pool, info);
valid = !(pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX);
d = 0;
switch (pf) {
case PIXEL_RGB_RESERVED_8BIT_PER_COLOR:
dstr = "rgb";
break;
case PIXEL_BGR_RESERVED_8BIT_PER_COLOR:
dstr = "bgr";
break;
case PIXEL_BIT_MASK:
dstr = "";
d = pixel_bpp(pf, pi);
break;
case PIXEL_BLT_ONLY:
dstr = "blt";
break;
default:
dstr = "xxx";
break;
}
efi_printk("Mode %3u %c%c: Resolution %ux%u-%s%.0hhu\n",
m,
m == cur_mode ? '*' : ' ',
!valid ? '-' : ' ',
w, h, dstr, d);
}
efi_puts("\nPress any key to continue (or wait 10 seconds)\n");
status = efi_wait_for_key(10 * EFI_USEC_PER_SEC, &key);
if (status != EFI_SUCCESS && status != EFI_TIMEOUT) {
efi_err("Unable to read key, continuing in 10 seconds\n");
efi_bs_call(stall, 10 * EFI_USEC_PER_SEC);
}
return cur_mode;
}
static void set_mode(efi_graphics_output_protocol_t *gop)
{
efi_graphics_output_protocol_mode_t *mode;
u32 cur_mode, new_mode;
switch (cmdline.option) {
case EFI_CMDLINE_MODE_NUM:
new_mode = choose_mode_modenum(gop);
break;
case EFI_CMDLINE_RES:
new_mode = choose_mode_res(gop);
break;
case EFI_CMDLINE_AUTO:
new_mode = choose_mode_auto(gop);
break;
case EFI_CMDLINE_LIST:
new_mode = choose_mode_list(gop);
break;
default:
return;
}
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
if (new_mode == cur_mode)
return;
if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS)
efi_err("Failed to set requested mode\n");
}
static void find_bits(u32 mask, u8 *pos, u8 *size)
{
if (!mask) {
*pos = *size = 0;
return;
}
/* UEFI spec guarantees that the set bits are contiguous */
*pos = __ffs(mask);
*size = __fls(mask) - *pos + 1;
}
static void
setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
efi_pixel_bitmask_t pixel_info, int pixel_format)
{
if (pixel_format == PIXEL_BIT_MASK) {
find_bits(pixel_info.red_mask,
&si->red_pos, &si->red_size);
find_bits(pixel_info.green_mask,
&si->green_pos, &si->green_size);
find_bits(pixel_info.blue_mask,
&si->blue_pos, &si->blue_size);
find_bits(pixel_info.reserved_mask,
&si->rsvd_pos, &si->rsvd_size);
si->lfb_depth = si->red_size + si->green_size +
si->blue_size + si->rsvd_size;
si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
} else {
if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
si->red_pos = 0;
si->blue_pos = 16;
} else /* PIXEL_BGR_RESERVED_8BIT_PER_COLOR */ {
si->blue_pos = 0;
si->red_pos = 16;
}
si->green_pos = 8;
si->rsvd_pos = 24;
si->red_size = si->green_size =
si->blue_size = si->rsvd_size = 8;
si->lfb_depth = 32;
si->lfb_linelength = pixels_per_scan_line * 4;
}
}
static efi_graphics_output_protocol_t *
find_gop(efi_guid_t *proto, unsigned long size, void **handles)
{
efi_graphics_output_protocol_t *first_gop;
efi_handle_t h;
int i;
first_gop = NULL;
for_each_efi_handle(h, handles, size, i) {
efi_status_t status;
efi_graphics_output_protocol_t *gop;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
void *dummy = NULL;
status = efi_bs_call(handle_protocol, h, proto, (void **)&gop);
if (status != EFI_SUCCESS)
continue;
mode = efi_table_attr(gop, mode);
info = efi_table_attr(mode, info);
if (info->pixel_format == PIXEL_BLT_ONLY ||
info->pixel_format >= PIXEL_FORMAT_MAX)
continue;
/*
* Systems that use the UEFI Console Splitter may
* provide multiple GOP devices, not all of which are
* backed by real hardware. The workaround is to search
* for a GOP implementing the ConOut protocol, and if
* one isn't found, to just fall back to the first GOP.
*
* Once we've found a GOP supporting ConOut,
* don't bother looking any further.
*/
status = efi_bs_call(handle_protocol, h, &conout_proto, &dummy);
if (status == EFI_SUCCESS)
return gop;
if (!first_gop)
first_gop = gop;
}
return first_gop;
}
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size, void **handles)
{
efi_graphics_output_protocol_t *gop;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
gop = find_gop(proto, size, handles);
/* Did we find any GOPs? */
if (!gop)
return EFI_NOT_FOUND;
/* Change mode if requested */
set_mode(gop);
/* EFI framebuffer */
mode = efi_table_attr(gop, mode);
info = efi_table_attr(mode, info);
si->orig_video_isVGA = VIDEO_TYPE_EFI;
si->lfb_width = info->horizontal_resolution;
si->lfb_height = info->vertical_resolution;
efi_set_u64_split(efi_table_attr(mode, frame_buffer_base),
&si->lfb_base, &si->ext_lfb_base);
if (si->ext_lfb_base)
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
si->pages = 1;
setup_pixel_info(si, info->pixels_per_scan_line,
info->pixel_information, info->pixel_format);
si->lfb_size = si->lfb_linelength * si->lfb_height;
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
return EFI_SUCCESS;
}
/*
* See if we have Graphics Output Protocol
*/
efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size)
{
efi_status_t status;
void **gop_handle = NULL;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)&gop_handle);
if (status != EFI_SUCCESS)
return status;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, proto, NULL,
&size, gop_handle);
if (status != EFI_SUCCESS)
goto free_handle;
status = setup_gop(si, proto, size, gop_handle);
free_handle:
efi_bs_call(free_pool, gop_handle);
return status;
}