blob: cf1a603e790fabdb9a1aba15c377c4151e8294c3 [file] [log] [blame]
// Option rom scanning code.
//
// Copyright (C) 2009-2010 coresystems GmbH
// Copyright (C) 2010 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "bregs.h" // struct bregs
#include "farptr.h" // FLATPTR_TO_SEG
#include "config.h" // CONFIG_*
#include "util.h" // dprintf
#include "jpeg.h" // splash
#include "biosvar.h" // SET_EBDA
#include "paravirt.h" // romfile_find
/****************************************************************
* VESA structures
****************************************************************/
struct vesa_info {
u32 vesa_signature;
u16 vesa_version;
struct segoff_s oem_string_ptr;
u8 capabilities[4];
struct segoff_s video_mode_ptr;
u16 total_memory;
u16 oem_software_rev;
struct segoff_s oem_vendor_name_ptr;
struct segoff_s oem_product_name_ptr;
struct segoff_s oem_product_rev_ptr;
u8 reserved[222];
u8 oem_data[256];
} PACKED;
#define VESA_SIGNATURE 0x41534556 // VESA
#define VBE2_SIGNATURE 0x32454256 // VBE2
struct vesa_mode_info {
u16 mode_attributes;
u8 win_a_attributes;
u8 win_b_attributes;
u16 win_granularity;
u16 win_size;
u16 win_a_segment;
u16 win_b_segment;
u32 win_func_ptr;
u16 bytes_per_scanline;
u16 x_resolution;
u16 y_resolution;
u8 x_charsize;
u8 y_charsize;
u8 number_of_planes;
u8 bits_per_pixel;
u8 number_of_banks;
u8 memory_model;
u8 bank_size;
u8 number_of_image_pages;
u8 reserved_page;
u8 red_mask_size;
u8 red_mask_pos;
u8 green_mask_size;
u8 green_mask_pos;
u8 blue_mask_size;
u8 blue_mask_pos;
u8 reserved_mask_size;
u8 reserved_mask_pos;
u8 direct_color_mode_info;
void *phys_base_ptr;
u32 offscreen_mem_offset;
u16 offscreen_mem_size;
u8 reserved[206];
} PACKED;
/****************************************************************
* Helper functions
****************************************************************/
// Call int10 vga handler.
static void
call16_int10(struct bregs *br)
{
br->flags = F_IF;
start_preempt();
call16_int(0x10, br);
finish_preempt();
}
/****************************************************************
* VGA text / graphics console
****************************************************************/
void
enable_vga_console(void)
{
dprintf(1, "Turning on vga text mode console\n");
struct bregs br;
/* Enable VGA text mode */
memset(&br, 0, sizeof(br));
br.ax = 0x0003;
call16_int10(&br);
// Write to screen.
printf("SeaBIOS (version %s)\n\n", VERSION);
}
static int
find_videomode(struct vesa_info *vesa_info, struct vesa_mode_info *mode_info
, int width, int height)
{
dprintf(3, "Finding vesa mode with dimensions %d/%d\n", width, height);
u16 *videomodes = SEGOFF_TO_FLATPTR(vesa_info->video_mode_ptr);
for (;; videomodes++) {
u16 videomode = *videomodes;
if (videomode == 0xffff) {
dprintf(1, "Unable to find vesa video mode dimensions %d/%d\n"
, width, height);
return -1;
}
struct bregs br;
memset(&br, 0, sizeof(br));
br.ax = 0x4f01;
br.cx = (1 << 14) | videomode;
br.di = FLATPTR_TO_OFFSET(mode_info);
br.es = FLATPTR_TO_SEG(mode_info);
call16_int10(&br);
if (br.ax != 0x4f) {
dprintf(1, "get_mode failed.\n");
continue;
}
if (mode_info->x_resolution != width
|| mode_info->y_resolution != height)
continue;
u8 depth = mode_info->bits_per_pixel;
if (depth != 16 && depth != 24 && depth != 32)
continue;
return videomode;
}
}
static int BootsplashActive;
void
enable_bootsplash(void)
{
if (!CONFIG_BOOTSPLASH)
return;
dprintf(3, "Checking for bootsplash\n");
int filesize;
u8 *filedata = romfile_loadfile("bootsplash.jpg", &filesize);
if (!filedata)
return;
u8 *picture = NULL;
struct vesa_info *vesa_info = malloc_tmplow(sizeof(*vesa_info));
struct vesa_mode_info *mode_info = malloc_tmplow(sizeof(*mode_info));
struct jpeg_decdata *jpeg = jpeg_alloc();
if (!jpeg || !vesa_info || !mode_info) {
warn_noalloc();
goto done;
}
/* Check whether we have a VESA 2.0 compliant BIOS */
memset(vesa_info, 0, sizeof(struct vesa_info));
vesa_info->vesa_signature = VBE2_SIGNATURE;
struct bregs br;
memset(&br, 0, sizeof(br));
br.ax = 0x4f00;
br.di = FLATPTR_TO_OFFSET(vesa_info);
br.es = FLATPTR_TO_SEG(vesa_info);
call16_int10(&br);
if (vesa_info->vesa_signature != VESA_SIGNATURE) {
dprintf(1,"No VBE2 found.\n");
goto done;
}
/* Print some debugging information about our card. */
char *vendor = SEGOFF_TO_FLATPTR(vesa_info->oem_vendor_name_ptr);
char *product = SEGOFF_TO_FLATPTR(vesa_info->oem_product_name_ptr);
dprintf(3, "VESA %d.%d\nVENDOR: %s\nPRODUCT: %s\n",
vesa_info->vesa_version>>8, vesa_info->vesa_version&0xff,
vendor, product);
// Parse jpeg and get image size.
dprintf(5, "Decoding bootsplash.jpg\n");
int ret = jpeg_decode(jpeg, filedata);
if (ret) {
dprintf(1, "jpeg_decode failed with return code %d...\n", ret);
goto done;
}
int width, height;
jpeg_get_size(jpeg, &width, &height);
// Try to find a graphics mode with the corresponding dimensions.
int videomode = find_videomode(vesa_info, mode_info, width, height);
if (videomode < 0)
goto done;
void *framebuffer = mode_info->phys_base_ptr;
int depth = mode_info->bits_per_pixel;
dprintf(3, "mode: %04x\n", videomode);
dprintf(3, "framebuffer: %p\n", framebuffer);
dprintf(3, "bytes per scanline: %d\n", mode_info->bytes_per_scanline);
dprintf(3, "bits per pixel: %d\n", depth);
// Allocate space for image and decompress it.
int imagesize = width * height * (depth / 8);
picture = malloc_tmphigh(imagesize);
if (!picture) {
warn_noalloc();
goto done;
}
dprintf(5, "Decompressing bootsplash.jpg\n");
ret = jpeg_show(jpeg, picture, width, height, depth);
if (ret) {
dprintf(1, "jpeg_show failed with return code %d...\n", ret);
goto done;
}
/* Switch to graphics mode */
dprintf(5, "Switching to graphics mode\n");
memset(&br, 0, sizeof(br));
br.ax = 0x4f02;
br.bx = (1 << 14) | videomode;
call16_int10(&br);
if (br.ax != 0x4f) {
dprintf(1, "set_mode failed.\n");
goto done;
}
/* Show the picture */
dprintf(5, "Showing bootsplash.jpg\n");
iomemcpy(framebuffer, picture, imagesize);
dprintf(5, "Bootsplash copy complete\n");
BootsplashActive = 1;
done:
free(filedata);
free(picture);
free(vesa_info);
free(mode_info);
free(jpeg);
return;
}
void
disable_bootsplash(void)
{
if (!CONFIG_BOOTSPLASH || !BootsplashActive)
return;
BootsplashActive = 0;
enable_vga_console();
}