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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>
21 lines
379 B
C
21 lines
379 B
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 _LINUX_ASM_VGA_H_
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#define _LINUX_ASM_VGA_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) (unsigned long)phys_to_virt(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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#endif
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