/*
* -----------------------------------------------------------------------
*
* Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* -----------------------------------------------------------------------
*
* -----------------------------------------------------------------------
* VGA splash screen code
* -----------------------------------------------------------------------
*/
#include <stddef.h>
#include "core.h"
#include <sys/io.h>
#include <hw/vga.h>
#include "fs.h"
#include "bios.h"
#include "graphics.h"
#include <syslinux/video.h>
__export uint8_t UsingVGA = 0;
uint16_t VGAPos; /* Pointer into VGA memory */
__export uint16_t *VGAFilePtr; /* Pointer into VGAFileBuf */
__export uint16_t VGAFontSize = 16; /* Defaults to 16 byte font */
__export char VGAFileBuf[VGA_FILE_BUF_SIZE]; /* Unmangled VGA image name */
__export char VGAFileMBuf[FILENAME_MAX]; /* Mangled VGA image name */
static uint8_t VGARowBuffer[640 + 80]; /* Decompression buffer */
static uint8_t VGAPlaneBuffer[(640/8) * 4]; /* Plane buffers */
extern uint16_t GXPixCols;
extern uint16_t GXPixRows;
/* Maps colors to consecutive DAC registers */
static uint8_t linear_color[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14, 15, 0 };
static FILE *fd;
typedef struct {
uint32_t LSSMagic; /* Magic number */
uint16_t GraphXSize; /* Width of splash screen file */
uint16_t GraphYSize; /* Height of splash screen file */
uint8_t GraphColorMap[3*16];
} lssheader_t;
static lssheader_t LSSHeader;
#define LSSMagic LSSHeader.LSSMagic
#define GraphXSize LSSHeader.GraphXSize
#define GraphYSize LSSHeader.GraphYSize
/*
* Enable VGA graphics, if possible. Return 0 on success.
*/
static int vgasetmode(void)
{
com32sys_t ireg, oreg;
if (UsingVGA)
return 0; /* Nothing to do... */
memset(&ireg, 0, sizeof(ireg));
memset(&oreg, 0, sizeof(oreg));
if (UsingVGA & 0x4) {
/*
* We're in VESA mode, which means VGA; use VESA call
* to revert the mode, and then call the conventional
* mode-setting for good measure...
*/
ireg.eax.w[0] = 0x4F02;
ireg.ebx.w[0] = 0x0012;
__intcall(0x10, &ireg, &oreg);
} else {
/* Get video card and monitor */
ireg.eax.w[0] = 0x1A00;
__intcall(0x10, &ireg, &oreg);
oreg.ebx.b[0] -= 7; /* BL=07h and BL=08h OK */
if (oreg.ebx.b[0] > 1)
return -1;
}
/*
* Set mode.
*/
memset(&ireg, 0, sizeof(ireg));
ireg.eax.w[0] = 0x0012; /* Set mode = 640x480 VGA 16 colors */
__intcall(0x10, &ireg, &oreg);
memset(&ireg, 0, sizeof(ireg));
ireg.edx.w[0] = (uint32_t)linear_color;
ireg.eax.w[0] = 0x1002; /* Write color registers */
__intcall(0x10, &ireg, &oreg);
UsingVGA = 1;
/* Set GXPixCols and GXPixRows */
GXPixCols = 640;
GXPixRows = 480;
use_font();
ScrollAttribute = 0;
return 0;
}
static inline char getnybble(void)
{
char data = getc(fd);
if (data & 0x10) {
data &= 0x0F;
return data;
}
data = getc(fd);
return (data & 0x0F);
}
/*
* rledecode:
* Decode a pixel row in RLE16 format.
*
* 'in': input (RLE16 encoded) buffer
* 'out': output (decoded) buffer
* 'count': pixel count
*/
static void rledecode(uint8_t *out, size_t count)
{
uint8_t prev_pixel = 0;
size_t size = count;
uint8_t data;
int i;
again:
for (i = 0; i < size; i++) {
data = getnybble();
if (data == prev_pixel)
break;
*out++ = data;
prev_pixel = data;
}
size -= i;
if (!size)
return;
/* Start of run sequence */
data = getnybble();
if (data == 0) {
/* long run */
uint8_t hi;
data = getnybble();
hi = getnybble();
hi <<= 4;
data |= hi;
data += 16;
}
/* dorun */
for (i = 0; i < data; i++)
*out++ = prev_pixel;
size -= i;
if (size)
goto again;
}
/*
* packedpixel2vga:
* Convert packed-pixel to VGA bitplanes
*
* 'in': packed pixel string (640 pixels)
* 'out': output (four planes @ 640/8 = 80 bytes)
* 'count': pixel count (multiple of 8)
*/
static void packedpixel2vga(const uint8_t *in, uint8_t *out)
{
int i, j, k;
for (i = 0; i < 4; i++) {
const uint8_t *ip = in;
for (j = 0; j < 640/8; j++) {
uint8_t ob = 0;
for (k = 0; k < 8; k++) {
uint8_t px = *ip++;
ob = (ob << 1) | ((px >> i) & 1);
}
*out++ = ob;
}
}
}
/*
* outputvga:
* Output four subsequent lines of VGA data
*
* 'in': four planes @ 640/8=80 bytes
* 'out': pointer into VGA memory
*/
static void outputvga(const void *in, void *out)
{
int i;
/* Select the sequencer mask */
outb(VGA_SEQ_IX_MAP_MASK, VGA_SEQ_ADDR);
for (i = 1; i <= 8; i <<= 1) {
/* Select the bit plane to write */
outb(i, VGA_SEQ_DATA);
memcpy(out, in, 640/8);
in = (const char *)in + 640/8;
}
}
/*
* Display a graphical splash screen.
*/
__export void vgadisplayfile(FILE *_fd)
{
char *p;
int size;
fd = _fd;
/*
* This is a cheap and easy way to make sure the screen is
* cleared in case we were in graphics mode aready.
*/
syslinux_force_text_mode();
vgasetmode();
size = 4+2*2+16*3;
p = (char *)&LSSHeader;
/* Load the header */
while (size--)
*p = getc(fd);
if (*p != EOF) {
com32sys_t ireg, oreg;
uint16_t rows;
int i;
/* The header WILL be in the first chunk. */
if (LSSMagic != 0x1413f33d)
return;
memset(&ireg, 0, sizeof(ireg));
/* Color map offset */
ireg.edx.w[0] = offsetof(lssheader_t, GraphColorMap);
ireg.eax.w[0] = 0x1012; /* Set RGB registers */
ireg.ebx.w[0] = 0; /* First register number */
ireg.ecx.w[0] = 16; /* 16 registers */
__intcall(0x10, &ireg, &oreg);
/* Number of pixel rows */
rows = (GraphYSize + VGAFontSize) - 1;
rows = rows / VGAFontSize;
if (rows >= VidRows)
rows = VidRows - 1;
memset(&ireg, 0, sizeof(ireg));
ireg.edx.b[1] = rows;
ireg.eax.b[1] = 2;
ireg.ebx.w[0] = 0;
/* Set cursor below image */
__intcall(0x10, &ireg, &oreg);
rows = GraphYSize; /* Number of graphics rows */
VGAPos = 0;
for (i = 0; i < rows; i++) {
/* Pre-clear the row buffer */
memset(VGARowBuffer, 0, 640);
/* Decode one row */
rledecode(VGARowBuffer, GraphXSize);
packedpixel2vga(VGARowBuffer, VGAPlaneBuffer);
outputvga(VGAPlaneBuffer, MK_PTR(0xA000, VGAPos));
VGAPos += 640/8;
}
}
}
/*
* Disable VGA graphics.
*/
__export void syslinux_force_text_mode(void)
{
com32sys_t ireg, oreg;
/* Already in text mode? */
if (!UsingVGA)
return;
if (UsingVGA & 0x4) {
/* VESA return to normal video mode */
memset(&ireg, 0, sizeof(ireg));
ireg.eax.w[0] = 0x4F02; /* Set SuperVGA video mode */
ireg.ebx.w[0] = 0x0003;
__intcall(0x10, &ireg, &oreg);
}
/* Return to normal video mode */
memset(&ireg, 0, sizeof(ireg));
ireg.eax.w[0] = 0x0003;
__intcall(0x10, &ireg, &oreg);
UsingVGA = 0;
ScrollAttribute = 0x7;
/* Restore text font/data */
use_font();
}
static void vgacursorcommon(char data)
{
if (UsingVGA) {
com32sys_t ireg;
memset(&ireg, 0, sizeof(ireg));
ireg.eax.b[0] = data;
ireg.eax.b[1] = 0x09;
ireg.ebx.w[0] = 0x0007;
ireg.ecx.w[0] = 1;
__intcall(0x10, &ireg, NULL);
}
}
void vgahidecursor(void)
{
vgacursorcommon(' ');
}
void vgashowcursor(void)
{
vgacursorcommon('_');
}
__export void using_vga(uint8_t vga, uint16_t pix_cols, uint16_t pix_rows)
{
UsingVGA = vga;
GXPixCols = pix_cols;
GXPixRows = pix_rows;
if (!(UsingVGA & 0x08))
adjust_screen();
}
void pm_using_vga(com32sys_t *regs)
{
using_vga(regs->eax.b[0], regs->ecx.w[0], regs->edx.w[0]);
}