/* * Copyright 2013 Google Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * on the rights to use, copy, modify, merge, publish, distribute, sub * license, and/or sell copies of the Software, and to permit persons to whom * the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <console/console.h> #include <edid.h> #include <boot/coreboot_tables.h> static int fb_valid; static struct lb_framebuffer edid_fb; /* * Take an edid, and create a framebuffer. Set fb_valid to 1. */ void set_vbe_mode_info_valid(const struct edid *edid, uintptr_t fb_addr) { edid_fb.physical_address = fb_addr; edid_fb.x_resolution = edid->x_resolution; edid_fb.y_resolution = edid->y_resolution; edid_fb.bytes_per_line = edid->bytes_per_line; /* In the case of (e.g.) 24 framebuffer bits per pixel, the convention * nowadays seems to be to round it up to the nearest reasonable * boundary, because otherwise the byte-packing is hideous. * So, for example, in RGB with no alpha, the bytes are still * packed into 32-bit words, the so-called 32bpp-no-alpha mode. * Or, in 5:6:5 mode, the bytes are also packed into 32-bit words, * and in 4:4:4 mode, they are packed into 16-bit words. * Good call on the hardware guys part. * It's not clear we're covering all cases here, but * I'm not sure with grahpics you ever can. */ edid_fb.bits_per_pixel = edid->framebuffer_bits_per_pixel; edid_fb.reserved_mask_pos = 0; edid_fb.reserved_mask_size = 0; switch (edid->framebuffer_bits_per_pixel) { case 32: case 24: /* packed into 4-byte words */ edid_fb.reserved_mask_pos = 24; edid_fb.reserved_mask_size = 8; edid_fb.red_mask_pos = 16; edid_fb.red_mask_size = 8; edid_fb.green_mask_pos = 8; edid_fb.green_mask_size = 8; edid_fb.blue_mask_pos = 0; edid_fb.blue_mask_size = 8; break; case 16: /* packed into 2-byte words */ edid_fb.red_mask_pos = 11; edid_fb.red_mask_size = 5; edid_fb.green_mask_pos = 5; edid_fb.green_mask_size = 6; edid_fb.blue_mask_pos = 0; edid_fb.blue_mask_size = 5; break; default: printk(BIOS_SPEW, "%s: unsupported BPP %d\n", __func__, edid->framebuffer_bits_per_pixel); return; } fb_valid = 1; } int fill_lb_framebuffer(struct lb_framebuffer *framebuffer) { if (!fb_valid) return -1; *framebuffer = edid_fb; return 0; }