1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Access to VGA videoram 4 * 5 * (c) 1998 Martin Mares <mj@ucw.cz> 6 */ 7 #ifndef _ASM_VGA_H 8 #define _ASM_VGA_H 9 10 #include <linux/string.h> 11 #include <asm/addrspace.h> 12 #include <asm/byteorder.h> 13 14 /* 15 * On the PC, we can just recalculate addresses and then 16 * access the videoram directly without any black magic. 17 */ 18 19 #define VGA_MAP_MEM(x, s) CKSEG1ADDR(0x10000000L + (unsigned long)(x)) 20 21 #define vga_readb(x) (*(x)) 22 #define vga_writeb(x, y) (*(y) = (x)) 23 24 #define VT_BUF_HAVE_RW 25 /* 26 * These are only needed for supporting VGA or MDA text mode, which use little 27 * endian byte ordering. 28 * In other cases, we can optimize by using native byte ordering and 29 * <linux/vt_buffer.h> has already done the right job for us. 30 */ 31 32 #undef scr_writew 33 #undef scr_readw 34 35 static inline void scr_writew(u16 val, volatile u16 *addr) 36 { 37 *addr = cpu_to_le16(val); 38 } 39 40 static inline u16 scr_readw(volatile const u16 *addr) 41 { 42 return le16_to_cpu(*addr); 43 } 44 45 static inline void scr_memsetw(u16 *s, u16 v, unsigned int count) 46 { 47 memset16(s, cpu_to_le16(v), count / 2); 48 } 49 50 #define VT_BUF_HAVE_MEMSETW 51 52 #endif /* _ASM_VGA_H */ 53