256 lines
7.6 KiB
C
256 lines
7.6 KiB
C
// Initialize the VGA console and possibly show a boot splash image.
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//
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// Copyright (C) 2009-2010 coresystems GmbH
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// Copyright (C) 2010 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "bregs.h" // struct bregs
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#include "config.h" // CONFIG_*
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#include "farptr.h" // FLATPTR_TO_SEG
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#include "malloc.h" // free
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#include "output.h" // dprintf
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#include "romfile.h" // romfile_loadfile
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#include "stacks.h" // call16_int
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#include "std/vbe.h" // struct vbe_info
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#include "string.h" // memset
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#include "util.h" // enable_bootsplash
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/****************************************************************
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* Helper functions
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****************************************************************/
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// Call int10 vga handler.
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static void
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call16_int10(struct bregs *br)
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{
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br->flags = F_IF;
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start_preempt();
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call16_int(0x10, br);
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finish_preempt();
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}
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/****************************************************************
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* VGA text / graphics console
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****************************************************************/
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void
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enable_vga_console(void)
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{
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dprintf(1, "Turning on vga text mode console\n");
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struct bregs br;
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/* Enable VGA text mode */
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memset(&br, 0, sizeof(br));
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br.ax = 0x0003;
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call16_int10(&br);
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// Write to screen.
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printf("SeaBIOS (version %s)\n", VERSION);
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display_uuid();
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}
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static int
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find_videomode(struct vbe_info *vesa_info, struct vbe_mode_info *mode_info
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, int width, int height, int bpp_req)
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{
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dprintf(3, "Finding vesa mode with dimensions %d/%d\n", width, height);
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u16 *videomodes = SEGOFF_TO_FLATPTR(vesa_info->video_mode);
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for (;; videomodes++) {
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u16 videomode = *videomodes;
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if (videomode == 0xffff) {
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dprintf(1, "Unable to find vesa video mode dimensions %d/%d\n"
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, width, height);
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return -1;
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}
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struct bregs br;
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memset(&br, 0, sizeof(br));
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br.ax = 0x4f01;
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br.cx = videomode;
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br.di = FLATPTR_TO_OFFSET(mode_info);
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br.es = FLATPTR_TO_SEG(mode_info);
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call16_int10(&br);
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if (br.ax != 0x4f) {
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dprintf(1, "get_mode failed.\n");
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continue;
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}
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if (mode_info->xres != width
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|| mode_info->yres != height)
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continue;
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u8 depth = mode_info->bits_per_pixel;
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if (bpp_req == 0) {
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if ((depth != 16 && depth != 24 && depth != 32)
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|| mode_info->green_size == 5)
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continue;
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} else {
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if (depth != bpp_req)
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continue;
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}
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return videomode;
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}
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}
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static int BootsplashActive;
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void
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enable_bootsplash(void)
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{
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if (!CONFIG_BOOTSPLASH)
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return;
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/* splash picture can be bmp or jpeg file */
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dprintf(3, "Checking for bootsplash\n");
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u8 type = 0; /* 0 means jpg, 1 means bmp, default is 0=jpg */
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int filesize;
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u8 *filedata = romfile_loadfile("bootsplash.jpg", &filesize);
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if (!filedata) {
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filedata = romfile_loadfile("bootsplash.bmp", &filesize);
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if (!filedata)
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return;
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type = 1;
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}
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dprintf(3, "start showing bootsplash\n");
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u8 *picture = NULL; /* data buff used to be flushed to the video buf */
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struct jpeg_decdata *jpeg = NULL;
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struct bmp_decdata *bmp = NULL;
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struct vbe_info *vesa_info = malloc_tmplow(sizeof(*vesa_info));
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struct vbe_mode_info *mode_info = malloc_tmplow(sizeof(*mode_info));
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if (!vesa_info || !mode_info) {
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warn_noalloc();
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goto done;
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}
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/* Check whether we have a VESA 2.0 compliant BIOS */
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memset(vesa_info, 0, sizeof(struct vbe_info));
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vesa_info->signature = VBE2_SIGNATURE;
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struct bregs br;
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memset(&br, 0, sizeof(br));
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br.ax = 0x4f00;
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br.di = FLATPTR_TO_OFFSET(vesa_info);
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br.es = FLATPTR_TO_SEG(vesa_info);
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call16_int10(&br);
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if (vesa_info->signature != VESA_SIGNATURE) {
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dprintf(1,"No VBE2 found.\n");
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goto done;
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}
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/* Print some debugging information about our card. */
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char *vendor = SEGOFF_TO_FLATPTR(vesa_info->oem_vendor_string);
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char *product = SEGOFF_TO_FLATPTR(vesa_info->oem_product_string);
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dprintf(3, "VESA %d.%d\nVENDOR: %s\nPRODUCT: %s\n",
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vesa_info->version>>8, vesa_info->version&0xff,
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vendor, product);
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int ret, width, height;
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int bpp_require = 0;
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if (type == 0) {
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jpeg = jpeg_alloc();
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if (!jpeg) {
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warn_noalloc();
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goto done;
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}
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/* Parse jpeg and get image size. */
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dprintf(5, "Decoding bootsplash.jpg\n");
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ret = jpeg_decode(jpeg, filedata);
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if (ret) {
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dprintf(1, "jpeg_decode failed with return code %d...\n", ret);
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goto done;
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}
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jpeg_get_size(jpeg, &width, &height);
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} else {
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bmp = bmp_alloc();
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if (!bmp) {
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warn_noalloc();
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goto done;
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}
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/* Parse bmp and get image size. */
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dprintf(5, "Decoding bootsplash.bmp\n");
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ret = bmp_decode(bmp, filedata, filesize);
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if (ret) {
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dprintf(1, "bmp_decode failed with return code %d...\n", ret);
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goto done;
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}
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bmp_get_info(bmp, &width, &height, &bpp_require);
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}
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// jpeg would use 16 or 24 bpp video mode, BMP uses 16/24/32 bpp mode.
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// Try to find a graphics mode with the corresponding dimensions.
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int videomode = find_videomode(vesa_info, mode_info, width, height,
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bpp_require);
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if (videomode < 0) {
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dprintf(1, "failed to find a videomode with %dx%d %dbpp (0=any).\n",
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width, height, bpp_require);
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goto done;
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}
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void *framebuffer = (void *)mode_info->phys_base;
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int depth = mode_info->bits_per_pixel;
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dprintf(3, "mode: %04x\n", videomode);
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dprintf(3, "framebuffer: %p\n", framebuffer);
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dprintf(3, "bytes per scanline: %d\n", mode_info->bytes_per_scanline);
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dprintf(3, "bits per pixel: %d\n", depth);
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// Allocate space for image and decompress it.
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int imagesize = height * mode_info->bytes_per_scanline;
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picture = malloc_tmphigh(imagesize);
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if (!picture) {
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warn_noalloc();
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goto done;
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}
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if (type == 0) {
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dprintf(5, "Decompressing bootsplash.jpg\n");
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ret = jpeg_show(jpeg, picture, width, height, depth,
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mode_info->bytes_per_scanline);
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if (ret) {
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dprintf(1, "jpeg_show failed with return code %d...\n", ret);
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goto done;
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}
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} else {
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dprintf(5, "Decompressing bootsplash.bmp\n");
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ret = bmp_show(bmp, picture, width, height, depth,
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mode_info->bytes_per_scanline);
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if (ret) {
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dprintf(1, "bmp_show failed with return code %d...\n", ret);
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goto done;
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}
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}
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/* Switch to graphics mode */
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dprintf(5, "Switching to graphics mode\n");
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memset(&br, 0, sizeof(br));
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br.ax = 0x4f02;
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br.bx = videomode | VBE_MODE_LINEAR_FRAME_BUFFER;
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call16_int10(&br);
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if (br.ax != 0x4f) {
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dprintf(1, "set_mode failed.\n");
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goto done;
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}
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/* Show the picture */
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dprintf(5, "Showing bootsplash picture\n");
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iomemcpy(framebuffer, picture, imagesize);
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dprintf(5, "Bootsplash copy complete\n");
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BootsplashActive = 1;
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done:
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free(filedata);
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free(picture);
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free(vesa_info);
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free(mode_info);
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free(jpeg);
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free(bmp);
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return;
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}
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void
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disable_bootsplash(void)
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{
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if (!CONFIG_BOOTSPLASH || !BootsplashActive)
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return;
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BootsplashActive = 0;
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enable_vga_console();
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}
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