Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 73 insertions, 0 deletions

diff --git a/include/linux/vt_buffer.h b/include/linux/vt_buffer.h
new file mode 100644
index 000000000..919d999a8
--- /dev/null
+++ b/include/linux/vt_buffer.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *	include/linux/vt_buffer.h -- Access to VT screen buffer
+ *
+ *	(c) 1998 Martin Mares <mj@ucw.cz>
+ *
+ *	This is a set of macros and functions which are used in the
+ *	console driver and related code to access the screen buffer.
+ *	In most cases the console works with simple in-memory buffer,
+ *	but when handling hardware text mode consoles, we store
+ *	the foreground console directly in video memory.
+ */
+
+#ifndef _LINUX_VT_BUFFER_H_
+#define _LINUX_VT_BUFFER_H_
+
+#include <linux/string.h>
+
+#if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE)
+#include <asm/vga.h>
+#endif
+
+#ifndef VT_BUF_HAVE_RW
+#define scr_writew(val, addr) (*(addr) = (val))
+#define scr_readw(addr) (*(addr))
+#endif
+
+#ifndef VT_BUF_HAVE_MEMSETW
+static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
+{
+#ifdef VT_BUF_HAVE_RW
+	count /= 2;
+	while (count--)
+		scr_writew(c, s++);
+#else
+	memset16(s, c, count / 2);
+#endif
+}
+#endif
+
+#ifndef VT_BUF_HAVE_MEMCPYW
+static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
+{
+#ifdef VT_BUF_HAVE_RW
+	count /= 2;
+	while (count--)
+		scr_writew(scr_readw(s++), d++);
+#else
+	memcpy(d, s, count);
+#endif
+}
+#endif
+
+#ifndef VT_BUF_HAVE_MEMMOVEW
+static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
+{
+#ifdef VT_BUF_HAVE_RW
+	if (d < s)
+		scr_memcpyw(d, s, count);
+	else {
+		count /= 2;
+		d += count;
+		s += count;
+		while (count--)
+			scr_writew(scr_readw(--s), --d);
+	}
+#else
+	memmove(d, s, count);
+#endif
+}
+#endif
+
+#endif