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/* ----------------------------------------------------------------------- *
*
* Copyright 2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
#include <inttypes.h>
#include <minmax.h>
#include <klibc/compiler.h>
#include <string.h>
#include <com32.h>
#include "vesa.h"
#include "video.h"
static struct win_info {
char *win_base;
size_t win_pos;
size_t win_size;
int win_gshift;
int win_num;
} wi;
static inline int __constfunc ilog2(unsigned int x)
{
asm("bsrl %1,%0" : "=r"(x) : "rm"(x));
return x;
}
void __vesacon_init_copy_to_screen(void)
{
struct vesa_mode_info *const mi = &__vesa_info.mi;
int winn;
if (mi->mode_attr & 0x0080) {
/* Linear frame buffer */
wi.win_base = (char *)mi->lfb_ptr;
wi.win_size = 1 << 31; /* 2 GB, i.e. one huge window */
wi.win_pos = 0; /* Already positioned (only one position...) */
wi.win_num = -1; /* Not a window */
} else {
/* Paged frame buffer */
/* We have already tested that *one* of these is usable */
if ((mi->win_attr[0] & 0x05) == 0x05 && mi->win_seg[0])
winn = 0;
else
winn = 1;
wi.win_num = winn;
wi.win_base = (char *)(mi->win_seg[winn] << 4);
wi.win_size = mi->win_size << 10;
wi.win_gshift = ilog2(mi->win_grain) + 10;
wi.win_pos = -1; /* Undefined position */
}
}
static void set_window_pos(size_t win_pos)
{
static com32sys_t ireg;
wi.win_pos = win_pos;
if (wi.win_num < 0)
return; /* This should never happen... */
ireg.eax.w[0] = 0x4F05;
ireg.ebx.b[0] = wi.win_num;
ireg.edx.w[0] = win_pos >> wi.win_gshift;
__intcall(0x10, &ireg, NULL);
}
void __vesacon_copy_to_screen(size_t dst, const uint32_t * src, size_t npixels)
{
size_t win_pos, win_off;
size_t win_size = wi.win_size;
size_t omask = win_size - 1;
char *win_base = wi.win_base;
size_t l;
size_t bytes = npixels * __vesacon_bytes_per_pixel;
char rowbuf[bytes + 4] __aligned(4);
const char *s;
s = (const char *)__vesacon_format_pixels(rowbuf, src, npixels);
while (bytes) {
win_off = dst & omask;
win_pos = dst & ~omask;
if (__unlikely(win_pos != wi.win_pos))
set_window_pos(win_pos);
l = min(bytes, win_size - win_off);
memcpy(win_base + win_off, s, l);
bytes -= l;
s += l;
dst += l;
}
}
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