linux-kernel - [PATCH 01/14] alpha: sort scr

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Date: Fri,  3 May 2024 10:11:12 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: linux-alpha@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
	Richard Henderson <richard.henderson@...aro.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Marc Zyngier <maz@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 01/14] alpha: sort scr_mem{cpy,move}w() out

From: Al Viro <viro@...iv.linux.org.uk>

Take scr_memmove() out of line, make both it and scr_memcpyw()
conditional upon VGA_CONSOLE or MDA_CONSOLE (if neither is
selected, we are certain to be working with the kernel-allocated
buffer rather than VRAM and defaults will work just fine).

That allows to clean vt_buffer.h, but that's a separate story

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/alpha/include/asm/vga.h |  2 ++
 arch/alpha/kernel/io.c       | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/alpha/include/asm/vga.h b/arch/alpha/include/asm/vga.h
index 4c347a8454c7..919931cb5b63 100644
--- a/arch/alpha/include/asm/vga.h
+++ b/arch/alpha/include/asm/vga.h
@@ -13,6 +13,7 @@
 #define VT_BUF_HAVE_RW
 #define VT_BUF_HAVE_MEMSETW
 #define VT_BUF_HAVE_MEMCPYW
+#define VT_BUF_HAVE_MEMMOVEW
 
 static inline void scr_writew(u16 val, volatile u16 *addr)
 {
@@ -40,6 +41,7 @@ static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
 
 /* Do not trust that the usage will be correct; analyze the arguments.  */
 extern void scr_memcpyw(u16 *d, const u16 *s, unsigned int count);
+extern void scr_memmovew(u16 *d, const u16 *s, unsigned int count);
 
 /* ??? These are currently only used for downloading character sets.  As
    such, they don't need memory barriers.  Is this all they are intended
diff --git a/arch/alpha/kernel/io.c b/arch/alpha/kernel/io.c
index eda09778268f..c28035d6d1e6 100644
--- a/arch/alpha/kernel/io.c
+++ b/arch/alpha/kernel/io.c
@@ -647,6 +647,10 @@ void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
 
 EXPORT_SYMBOL(_memset_c_io);
 
+#if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE)
+
+#include <asm/vga.h>
+
 /* A version of memcpy used by the vga console routines to move data around
    arbitrarily between screen and main memory.  */
 
@@ -681,6 +685,21 @@ scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
 
 EXPORT_SYMBOL(scr_memcpyw);
 
+void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
+{
+	if (d < s)
+		scr_memcpyw(d, s, count);
+	else {
+		count /= 2;
+		d += count;
+		s += count;
+		while (count--)
+			scr_writew(scr_readw(--s), --d);
+	}
+}
+EXPORT_SYMBOL(scr_memmovew);
+#endif
+
 void __iomem *ioport_map(unsigned long port, unsigned int size)
 {
 	return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
-- 
2.39.2