025a22151c
This code replaces earlier and incomplete handling of graphics on non-zero PCI domains (aka hoses or peer PCI buses). An option (CONFIG_VGA_HOSE) is set TRUE if configuring a GENERIC kernel, or a kernel for MARVEL, TITAN, or TSUNAMI machines, as these are the machines whose SRM consoles are capable of configuring and handling graphics options on non-zero hoses. All other machines have the option set FALSE. A routine, "find_console_vga_hose()", is used to find the graphics device which the machine's firmware believes is the console device, and it sets a global (pci_vga_hose) for later use in managing access to the device. This is called in "init_arch" on TITAN and TSUNAMI machines; MARVEL machines use a custom version of this routine because of extra complexity. A routine, "locate_and_init_vga()", is used to find the graphics device and set a global (pci_vga_hose) for later use in managing access to the device, in the case where "find_console_vga_hose" has failed. Various adjustments are made to the ioremap and ioportmap routines for detecting and translating "legacy" VGA register and memory references to the real PCI domain. [akpm@linux-foundation.org: don't statically init bss] [akpm@linux-foundation.org: build fix] Signed-off-by: Jay Estabrook <jay.estabrook@hp.com> Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
82 lines
2 KiB
C
82 lines
2 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 _LINUX_ASM_VGA_H_
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#define _LINUX_ASM_VGA_H_
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#include <asm/io.h>
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#define VT_BUF_HAVE_RW
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#define VT_BUF_HAVE_MEMSETW
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#define VT_BUF_HAVE_MEMCPYW
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extern inline void scr_writew(u16 val, volatile u16 *addr)
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{
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if (__is_ioaddr(addr))
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__raw_writew(val, (volatile u16 __iomem *) addr);
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else
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*addr = val;
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}
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extern inline u16 scr_readw(volatile const u16 *addr)
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{
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if (__is_ioaddr(addr))
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return __raw_readw((volatile const u16 __iomem *) addr);
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else
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return *addr;
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}
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extern inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
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{
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if (__is_ioaddr(s))
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memsetw_io((u16 __iomem *) s, c, count);
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else
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memsetw(s, c, count);
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}
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/* Do not trust that the usage will be correct; analyze the arguments. */
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extern void scr_memcpyw(u16 *d, const u16 *s, unsigned int count);
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/* ??? These are currently only used for downloading character sets. As
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such, they don't need memory barriers. Is this all they are intended
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to be used for? */
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#define vga_readb(a) readb((u8 __iomem *)(a))
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#define vga_writeb(v,a) writeb(v, (u8 __iomem *)(a))
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#ifdef CONFIG_VGA_HOSE
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#include <linux/ioport.h>
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#include <linux/pci.h>
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extern struct pci_controller *pci_vga_hose;
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# define __is_port_vga(a) \
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(((a) >= 0x3b0) && ((a) < 0x3e0) && \
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((a) != 0x3b3) && ((a) != 0x3d3))
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# define __is_mem_vga(a) \
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(((a) >= 0xa0000) && ((a) <= 0xc0000))
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# define FIXUP_IOADDR_VGA(a) do { \
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if (pci_vga_hose && __is_port_vga(a)) \
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(a) += pci_vga_hose->io_space->start; \
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} while(0)
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# define FIXUP_MEMADDR_VGA(a) do { \
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if (pci_vga_hose && __is_mem_vga(a)) \
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(a) += pci_vga_hose->mem_space->start; \
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} while(0)
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#else /* CONFIG_VGA_HOSE */
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# define pci_vga_hose 0
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# define __is_port_vga(a) 0
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# define __is_mem_vga(a) 0
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# define FIXUP_IOADDR_VGA(a)
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# define FIXUP_MEMADDR_VGA(a)
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#endif /* CONFIG_VGA_HOSE */
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#define VGA_MAP_MEM(x,s) ((unsigned long) ioremap(x, s))
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#endif
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