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