diff options
Diffstat (limited to 'drivers/firmware/efi/libstub/gop.c')
| -rw-r--r-- | drivers/firmware/efi/libstub/gop.c | 580 |
1 files changed, 580 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c new file mode 100644 index 0000000000..ea5da307d5 --- /dev/null +++ b/drivers/firmware/efi/libstub/gop.c @@ -0,0 +1,580 @@ +// 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; +} |