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efi/gop: Allow specifying mode by <xres>x<yres>
Add the ability to choose a video mode using a command-line argument of the form video=efifb:<xres>x<yres> Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Link: https://lore.kernel.org/r/20200320020028.1936003-13-nivedita@alum.mit.edu Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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@ -50,4 +50,9 @@ mode=n
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The EFI stub will set the mode of the display to mode number n if
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possible.
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<xres>x<yres>
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The EFI stub will search for a display mode that matches the specified
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horizontal and vertical resolution, and set the mode of the display to
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it if one is found.
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Edgar Hucek <gimli@dark-green.com>
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@ -6,6 +6,7 @@
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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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@ -17,11 +18,17 @@
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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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};
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static struct {
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enum efi_cmdline_option option;
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u32 mode;
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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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} res;
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};
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} cmdline __efistub_global = { .option = EFI_CMDLINE_NONE };
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static bool parse_modenum(char *option, char **next)
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@ -41,11 +48,33 @@ static bool parse_modenum(char *option, char **next)
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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;
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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 && *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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*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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while (*option && *option++ != ',')
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;
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@ -94,6 +123,56 @@ static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop)
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return cmdline.mode;
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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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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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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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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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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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return m;
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}
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efi_printk("Couldn't find requested mode\n");
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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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@ -103,6 +182,9 @@ static void set_mode(efi_graphics_output_protocol_t *gop)
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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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default:
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return;
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}
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