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56 lines
1.3 KiB
56 lines
1.3 KiB
/* 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 <[email protected]> |
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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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