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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 void *
vesacon_copy_to_paged_screen(void *dst, const void *src, size_t len);
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) {
__vesacon_copy_to_screen = memcpy; /* Really easy... */
} else {
__vesacon_copy_to_screen = vesacon_copy_to_paged_screen;
mi->lfb_ptr = 0; /* Zero-base this */
wi.win_pos = -1; /* Undefined position */
/* 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;
}
}
static void *
vesacon_copy_to_paged_screen(void *dst, const void *src, size_t len)
{
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 d = (size_t)dst;
const char *s = src;
com32sys_t ireg;
memset(&ireg, 0, sizeof ireg);
ireg.eax.w[0] = 0x4F05; /* VBE Window Control */
/* BH = 0 -> Set memory window */
ireg.ebx.b[0] = wi.win_num;
while (len) {
win_off = d & omask;
win_pos = d & ~omask;
if (win_pos != wi.win_pos) {
ireg.edx.w[0] = win_pos >> wi.win_gshift;
__intcall(0x10, &ireg, NULL);
wi.win_pos = win_pos;
}
l = min(len, win_size - win_off);
memcpy(win_base + win_off, s, l);
len -= l;
s += l;
d += l;
}
return dst;
}
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