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4f1bcaf094
VGA_MAP_MEM translates to ioremap() on some architectures. It makes sense to do this to vga_vram_base, because we're going to access memory between vga_vram_base and vga_vram_end. But it doesn't really make sense to map starting at vga_vram_end, because we aren't going to access memory starting there. On ia64, which always has to be different, ioremapping vga_vram_end gives you something completely incompatible with ioremapped vga_vram_start, so vga_vram_size ends up being nonsense. As a bonus, we often know the size up front, so we can use ioremap() correctly, rather than giving it a zero size. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
/*
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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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#ifndef _ASM_VGA_H
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#define _ASM_VGA_H
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#include <asm/byteorder.h>
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/*
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* On the PC, we can just recalculate addresses and then
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* access the videoram directly without any black magic.
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*/
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#define VGA_MAP_MEM(x,s) (0xb0000000L + (unsigned long)(x))
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#define vga_readb(x) (*(x))
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#define vga_writeb(x,y) (*(y) = (x))
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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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#undef scr_writew
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#undef scr_readw
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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 scr_memcpyw(d, s, c) memcpy(d, s, c)
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#define scr_memmovew(d, s, c) memmove(d, s, c)
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#define VT_BUF_HAVE_MEMCPYW
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#define VT_BUF_HAVE_MEMMOVEW
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#endif /* _ASM_VGA_H */
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