1 files changed, 117 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/sys/vesa/screencpy.c b/contrib/syslinux-4.02/com32/lib/sys/vesa/screencpy.c
new file mode 100644
index 0000000..32dce9e
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/lib/sys/vesa/screencpy.c
@@ -0,0 +1,117 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   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 <ilog2.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;
+
+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;
+    }
+}