mirror of https://gitee.com/openkylin/linux.git
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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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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#ifndef _ASM_VGA_H
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#define _ASM_VGA_H
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#include <linux/string.h>
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#include <asm/addrspace.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) CKSEG1ADDR(0x10000000L + (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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static inline void scr_memsetw(u16 *s, u16 v, unsigned int count)
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{
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memset16(s, cpu_to_le16(v), count / 2);
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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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#define VT_BUF_HAVE_MEMSETW
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#endif /* _ASM_VGA_H */
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