• Arnd Bergmann's avatar
    asm-generic: add legacy I/O header files · ae49e807
    Arnd Bergmann authored
    The dma.h, hw_irq.h, serial.h and timex.h files originally
    described PC-style i8237, i8259A, i8250, i8253 and i8255 chips
    as well as the VGA style text mode graphics.
    
    Modern architectures live happily without these specific
    interfaces, but a few definitions from these headers keep
    getting used in common code.
    
    The new generic headers are what most architectures use
    anyway nowadays, just implementing the minimal definitions.
    Signed-off-by: default avatarRemis Lima Baima <remis.developer@googlemail.com>
    Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    ae49e807
vga.h 548 Bytes
/*
 *	Access to VGA videoram
 *
 *	(c) 1998 Martin Mares <mj@ucw.cz>
 */
#ifndef __ASM_GENERIC_VGA_H
#define __ASM_GENERIC_VGA_H

/*
 *	On most architectures that support VGA, we can just
 *	recalculate addresses and then access the videoram
 *	directly without any black magic.
 *
 *	Everyone else needs to ioremap the address and use
 *	proper I/O accesses.
 */
#ifndef VGA_MAP_MEM
#define VGA_MAP_MEM(x, s) (unsigned long)phys_to_virt(x)
#endif

#define vga_readb(x) (*(x))
#define vga_writeb(x, y) (*(y) = (x))

#endif /* _ASM_GENERIC_VGA_H */