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f571872671
ppc has special instruction forms to efficiently load and store values
in non-native endianness. These can be accessed via the arch-specific
{ld,st}_le{16,32}() inlines in arch/powerpc/include/asm/swab.h.
However, gcc is perfectly capable of generating the byte-reversing
load/store instructions when using the normal, generic cpu_to_le*() and
le*_to_cpu() functions eaning the arch-specific functions don't have much
point.
Worse the "le" in the names of the arch specific functions is now
misleading, because they always generate byte-reversing forms, but some
ppc machines can now run a little-endian kernel.
To start getting rid of the arch-specific forms, this patch removes them
from all the old Power Macintosh drivers, replacing them with the
generic byteswappers.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
52 lines
1 KiB
C
52 lines
1 KiB
C
#ifndef _ASM_POWERPC_VGA_H_
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#define _ASM_POWERPC_VGA_H_
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#ifdef __KERNEL__
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/*
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* Access to VGA videoram
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*
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* (c) 1998 Martin Mares <mj@ucw.cz>
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*/
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#include <asm/io.h>
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#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE)
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#define VT_BUF_HAVE_RW
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/*
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* These are only needed for supporting VGA or MDA text mode, which use little
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* endian byte ordering.
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* In other cases, we can optimize by using native byte ordering and
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* <linux/vt_buffer.h> has already done the right job for us.
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*/
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static inline void scr_writew(u16 val, volatile u16 *addr)
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{
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*addr = cpu_to_le16(val);
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}
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static inline u16 scr_readw(volatile const u16 *addr)
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{
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return le16_to_cpu(*addr);
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}
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#define VT_BUF_HAVE_MEMCPYW
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#define scr_memcpyw memcpy
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#endif /* !CONFIG_VGA_CONSOLE && !CONFIG_MDA_CONSOLE */
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#ifdef __powerpc64__
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#define VGA_MAP_MEM(x,s) ((unsigned long) ioremap((x), s))
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#else
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#define VGA_MAP_MEM(x,s) (x)
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#endif
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#define vga_readb(x) (*(x))
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#define vga_writeb(x,y) (*(y) = (x))
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_VGA_H_ */
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