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