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// Code for manipulating VGA framebuffers.
//
// Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2001-2008 the LGPL VGABios developers Team
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // GET_BDA
#include "util.h" // memset_far
#include "vgatables.h" // find_vga_entry
/****************************************************************
* Screen scrolling
****************************************************************/
static inline void *
memcpy_stride(u16 seg, void *dst, void *src, int copylen, int stride, int lines)
{
for (; lines; lines--, dst+=stride, src+=stride)
memcpy_far(seg, dst, seg, src, copylen);
return dst;
}
static inline void
memset_stride(u16 seg, void *dst, u8 val, int setlen, int stride, int lines)
{
for (; lines; lines--, dst+=stride)
memset_far(seg, dst, val, setlen);
}
static inline void
memset16_stride(u16 seg, void *dst, u16 val, int setlen, int stride, int lines)
{
for (; lines; lines--, dst+=stride)
memset16_far(seg, dst, val, setlen);
}
static void
scroll_pl4(struct vgamode_s *vmode_g, int nblines, int attr
, struct cursorpos ul, struct cursorpos lr)
{
struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
u8 cheight = GET_GLOBAL(vparam_g->cheight);
int stride = GET_BDA(video_cols);
void *src_far, *dest_far;
if (nblines >= 0) {
dest_far = (void*)(ul.y * cheight * stride + ul.x);
src_far = dest_far + nblines * cheight * stride;
} else {
// Scroll down
nblines = -nblines;
dest_far = (void*)(lr.y * cheight * stride + ul.x);
src_far = dest_far - nblines * cheight * stride;
stride = -stride;
}
int cols = lr.x - ul.x + 1;
int rows = lr.y - ul.y + 1;
if (nblines < rows) {
vgahw_grdc_write(0x05, 0x01);
dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols, stride
, (rows - nblines) * cheight);
}
if (attr < 0)
attr = 0;
vgahw_grdc_write(0x05, 0x02);
memset_stride(SEG_GRAPH, dest_far, attr, cols, stride, nblines * cheight);
vgahw_grdc_write(0x05, 0x00);
}
static void
scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr
, struct cursorpos ul, struct cursorpos lr)
{
struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
u8 cheight = GET_GLOBAL(vparam_g->cheight);
u8 bpp = GET_GLOBAL(vmode_g->pixbits);
int stride = GET_BDA(video_cols) * bpp;
void *src_far, *dest_far;
if (nblines >= 0) {
dest_far = (void*)(ul.y * cheight * stride + ul.x * bpp);
src_far = dest_far + nblines * cheight * stride;
} else {
// Scroll down
nblines = -nblines;
dest_far = (void*)(lr.y * cheight * stride + ul.x * bpp);
src_far = dest_far - nblines * cheight * stride;
stride = -stride;
}
int cols = (lr.x - ul.x + 1) * bpp;
int rows = lr.y - ul.y + 1;
if (nblines < rows) {
memcpy_stride(SEG_CTEXT, dest_far + 0x2000, src_far + 0x2000, cols
, stride, (rows - nblines) * cheight / 2);
dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols
, stride, (rows - nblines) * cheight / 2);
}
if (attr < 0)
attr = 0;
memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols
, stride, nblines * cheight / 2);
memset_stride(SEG_CTEXT, dest_far, attr, cols
, stride, nblines * cheight / 2);
}
static void
scroll_text(struct vgamode_s *vmode_g, int nblines, int attr
, struct cursorpos ul, struct cursorpos lr)
{
u16 nbrows = GET_BDA(video_rows) + 1;
u16 nbcols = GET_BDA(video_cols);
void *src_far, *dest_far = (void*)SCREEN_MEM_START(nbcols, nbrows, ul.page);
int stride = nbcols * 2;
if (nblines >= 0) {
dest_far += ul.y * stride + ul.x * 2;
src_far = dest_far + nblines * stride;
} else {
// Scroll down
nblines = -nblines;
dest_far += lr.y * stride + ul.x * 2;
src_far = dest_far - nblines * stride;
stride = -stride;
}
int cols = (lr.x - ul.x + 1) * 2;
int rows = lr.y - ul.y + 1;
u16 seg = GET_GLOBAL(vmode_g->sstart);
if (nblines < rows)
dest_far = memcpy_stride(seg, dest_far, src_far, cols, stride
, (rows - nblines));
if (attr < 0)
attr = 0x07;
attr = (attr << 8) | ' ';
memset16_stride(seg, dest_far, attr, cols, stride, nblines);
}
void
vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
{
// Get the mode
struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
if (!vmode_g)
return;
// FIXME gfx mode not complete
switch (GET_GLOBAL(vmode_g->memmodel)) {
case CTEXT:
case MTEXT:
scroll_text(vmode_g, nblines, attr, ul, lr);
break;
case PLANAR4:
case PLANAR1:
scroll_pl4(vmode_g, nblines, attr, ul, lr);
break;
case CGA:
scroll_cga(vmode_g, nblines, attr, ul, lr);
break;
default:
dprintf(1, "Scroll in graphics mode\n");
}
}
void
clear_screen(struct vgamode_s *vmode_g)
{
switch (GET_GLOBAL(vmode_g->memmodel)) {
case CTEXT:
case MTEXT:
memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0720, 32*1024);
break;
case CGA:
memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 32*1024);
break;
default:
// XXX - old code gets/sets/restores sequ register 2 to 0xf -
// but it should always be 0xf anyway.
memset16_far(GET_GLOBAL(vmode_g->sstart), 0, 0x0000, 64*1024);
}
}
/****************************************************************
* Read/write characters to screen
****************************************************************/
static void
write_gfx_char_pl4(struct vgamode_s *vmode_g
, struct cursorpos cp, struct carattr ca)
{
u16 nbcols = GET_BDA(video_cols);
if (cp.x >= nbcols)
return;
struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
u8 cheight = GET_GLOBAL(vparam_g->cheight);
u8 *fdata_g;
switch (cheight) {
case 14:
fdata_g = vgafont14;
break;
case 16:
fdata_g = vgafont16;
break;
default:
fdata_g = vgafont8;
}
u16 addr = cp.x + cp.y * cheight * nbcols;
u16 src = ca.car * cheight;
vgahw_sequ_write(0x02, 0x0f);
vgahw_grdc_write(0x05, 0x02);
if (ca.attr & 0x80)
vgahw_grdc_write(0x03, 0x18);
else
vgahw_grdc_write(0x03, 0x00);
u8 i;
for (i = 0; i < cheight; i++) {
u8 *dest_far = (void*)(addr + i * nbcols);
u8 j;
for (j = 0; j < 8; j++) {
u8 mask = 0x80 >> j;
vgahw_grdc_write(0x08, mask);
GET_FARVAR(SEG_GRAPH, *dest_far);
if (GET_GLOBAL(fdata_g[src + i]) & mask)
SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
else
SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
}
}
vgahw_grdc_write(0x08, 0xff);
vgahw_grdc_write(0x05, 0x00);
vgahw_grdc_write(0x03, 0x00);
}
static void
write_gfx_char_cga(struct vgamode_s *vmode_g
, struct cursorpos cp, struct carattr ca)
{
u16 nbcols = GET_BDA(video_cols);
if (cp.x >= nbcols)
return;
u8 *fdata_g = vgafont8;
u8 bpp = GET_GLOBAL(vmode_g->pixbits);
u16 addr = (cp.x * bpp) + cp.y * 320;
u16 src = ca.car * 8;
u8 i;
for (i = 0; i < 8; i++) {
u8 *dest_far = (void*)(addr + (i >> 1) * 80);
if (i & 1)
dest_far += 0x2000;
u8 mask = 0x80;
if (bpp == 1) {
u8 data = 0;
if (ca.attr & 0x80)
data = GET_FARVAR(SEG_CTEXT, *dest_far);
u8 j;
for (j = 0; j < 8; j++) {
if (GET_GLOBAL(fdata_g[src + i]) & mask) {
if (ca.attr & 0x80)
data ^= (ca.attr & 0x01) << (7 - j);
else
data |= (ca.attr & 0x01) << (7 - j);
}
mask >>= 1;
}
SET_FARVAR(SEG_CTEXT, *dest_far, data);
} else {
while (mask > 0) {
u8 data = 0;
if (ca.attr & 0x80)
data = GET_FARVAR(SEG_CTEXT, *dest_far);
u8 j;
for (j = 0; j < 4; j++) {
if (GET_GLOBAL(fdata_g[src + i]) & mask) {
if (ca.attr & 0x80)
data ^= (ca.attr & 0x03) << ((3 - j) * 2);
else
data |= (ca.attr & 0x03) << ((3 - j) * 2);
}
mask >>= 1;
}
SET_FARVAR(SEG_CTEXT, *dest_far, data);
dest_far += 1;
}
}
}
}
static void
write_gfx_char_lin(struct vgamode_s *vmode_g
, struct cursorpos cp, struct carattr ca)
{
// Get the dimensions
u16 nbcols = GET_BDA(video_cols);
if (cp.x >= nbcols)
return;
u8 *fdata_g = vgafont8;
u16 addr = cp.x * 8 + cp.y * nbcols * 64;
u16 src = ca.car * 8;
u8 i;
for (i = 0; i < 8; i++) {
u8 *dest_far = (void*)(addr + i * nbcols * 8);
u8 mask = 0x80;
u8 j;
for (j = 0; j < 8; j++) {
u8 data = 0x00;
if (GET_GLOBAL(fdata_g[src + i]) & mask)
data = ca.attr;
SET_FARVAR(SEG_GRAPH, dest_far[j], data);
mask >>= 1;
}
}
}
static void
write_text_char(struct vgamode_s *vmode_g
, struct cursorpos cp, struct carattr ca)
{
// Get the dimensions
u16 nbrows = GET_BDA(video_rows) + 1;
u16 nbcols = GET_BDA(video_cols);
// Compute the address
void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
+ (cp.x + cp.y * nbcols) * 2);
if (ca.use_attr) {
u16 dummy = (ca.attr << 8) | ca.car;
SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
} else {
SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
}
}
void
vgafb_write_char(struct cursorpos cp, struct carattr ca)
{
// Get the mode
struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
if (!vmode_g)
return;
// FIXME gfx mode not complete
switch (GET_GLOBAL(vmode_g->memmodel)) {
case CTEXT:
case MTEXT:
write_text_char(vmode_g, cp, ca);
break;
case PLANAR4:
case PLANAR1:
write_gfx_char_pl4(vmode_g, cp, ca);
break;
case CGA:
write_gfx_char_cga(vmode_g, cp, ca);
break;
case LINEAR8:
write_gfx_char_lin(vmode_g, cp, ca);
break;
}
}
struct carattr
vgafb_read_char(struct cursorpos cp)
{
// Get the mode
struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
if (!vmode_g)
goto fail;
if (!(GET_GLOBAL(vmode_g->memmodel) & TEXT)) {
// FIXME gfx mode
dprintf(1, "Read char in graphics mode\n");
goto fail;
}
// Get the dimensions
u16 nbrows = GET_BDA(video_rows) + 1;
u16 nbcols = GET_BDA(video_cols);
// Compute the address
u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
+ (cp.x + cp.y * nbcols) * 2);
u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
struct carattr ca = {v, v>>8, 0};
return ca;
fail: ;
struct carattr ca2 = {0, 0, 0};
return ca2;
}
/****************************************************************
* Read/write pixels
****************************************************************/
void
vgafb_write_pixel(u8 color, u16 x, u16 y)
{
// Get the mode
struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
if (!vmode_g)
return;
if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
return;
u8 *addr_far, mask, attr, data;
switch (GET_GLOBAL(vmode_g->memmodel)) {
case PLANAR4:
case PLANAR1:
addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
mask = 0x80 >> (x & 0x07);
vgahw_grdc_write(0x08, mask);
vgahw_grdc_write(0x05, 0x02);
data = GET_FARVAR(SEG_GRAPH, *addr_far);
if (color & 0x80)
vgahw_grdc_write(0x03, 0x18);
SET_FARVAR(SEG_GRAPH, *addr_far, color);
vgahw_grdc_write(0x08, 0xff);
vgahw_grdc_write(0x05, 0x00);
vgahw_grdc_write(0x03, 0x00);
break;
case CGA:
if (GET_GLOBAL(vmode_g->pixbits) == 2)
addr_far = (void*)((x >> 2) + (y >> 1) * 80);
else
addr_far = (void*)((x >> 3) + (y >> 1) * 80);
if (y & 1)
addr_far += 0x2000;
data = GET_FARVAR(SEG_CTEXT, *addr_far);
if (GET_GLOBAL(vmode_g->pixbits) == 2) {
attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
mask = 0x03 << ((3 - (x & 0x03)) * 2);
} else {
attr = (color & 0x01) << (7 - (x & 0x07));
mask = 0x01 << (7 - (x & 0x07));
}
if (color & 0x80) {
data ^= attr;
} else {
data &= ~mask;
data |= attr;
}
SET_FARVAR(SEG_CTEXT, *addr_far, data);
break;
case LINEAR8:
addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
SET_FARVAR(SEG_GRAPH, *addr_far, color);
break;
}
}
u8
vgafb_read_pixel(u16 x, u16 y)
{
// Get the mode
struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
if (!vmode_g)
return 0;
if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
return 0;
u8 *addr_far, mask, attr=0, data, i;
switch (GET_GLOBAL(vmode_g->memmodel)) {
case PLANAR4:
case PLANAR1:
addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
mask = 0x80 >> (x & 0x07);
attr = 0x00;
for (i = 0; i < 4; i++) {
vgahw_grdc_write(0x04, i);
data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
if (data > 0)
attr |= (0x01 << i);
}
break;
case CGA:
addr_far = (void*)((x >> 2) + (y >> 1) * 80);
if (y & 1)
addr_far += 0x2000;
data = GET_FARVAR(SEG_CTEXT, *addr_far);
if (GET_GLOBAL(vmode_g->pixbits) == 2)
attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
else
attr = (data >> (7 - (x & 0x07))) & 0x01;
break;
case LINEAR8:
addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
attr = GET_FARVAR(SEG_GRAPH, *addr_far);
break;
}
return attr;
}
/****************************************************************
* Font loading
****************************************************************/
void
vgafb_load_font(u16 seg, void *src_far, u16 count
, u16 start, u8 destflags, u8 fontsize)
{
get_font_access();
u16 blockaddr = ((destflags & 0x03) << 14) + ((destflags & 0x04) << 11);
void *dest_far = (void*)(blockaddr + start*32);
u16 i;
for (i = 0; i < count; i++)
memcpy_far(SEG_GRAPH, dest_far + i*32
, seg, src_far + i*fontsize, fontsize);
release_font_access();
}
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