| 1 | /* |
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| 2 | * include/linux/vt_buffer.h -- Access to VT screen buffer |
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| 3 | * |
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| 4 | * (c) 1998 Martin Mares <mj@ucw.cz> |
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| 5 | * |
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| 6 | * This is a set of macros and functions which are used in the |
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| 7 | * console driver and related code to access the screen buffer. |
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| 8 | * In most cases the console works with simple in-memory buffer, |
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| 9 | * but when handling hardware text mode consoles, we store |
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| 10 | * the foreground console directly in video memory. |
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| 11 | */ |
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| 12 | |
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| 13 | #ifndef _LINUX_VT_BUFFER_H_ |
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| 14 | #define _LINUX_VT_BUFFER_H_ |
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| 15 | |
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| 16 | |
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| 17 | #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE) |
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| 18 | #include <asm/vga.h> |
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| 19 | #endif |
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| 20 | |
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| 21 | #ifndef VT_BUF_HAVE_RW |
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| 22 | #define scr_writew(val, addr) (*(addr) = (val)) |
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| 23 | #define scr_readw(addr) (*(addr)) |
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| 24 | #define scr_memcpyw(d, s, c) memcpy(d, s, c) |
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| 25 | #define scr_memmovew(d, s, c) memmove(d, s, c) |
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| 26 | #define VT_BUF_HAVE_MEMCPYW |
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| 27 | #define VT_BUF_HAVE_MEMMOVEW |
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| 28 | #endif |
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| 29 | |
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| 30 | #ifndef VT_BUF_HAVE_MEMSETW |
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| 31 | static inline void scr_memsetw(__u16 *s, __u16 c, unsigned int count) |
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| 32 | { |
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| 33 | count /= 2; |
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| 34 | while (count--) |
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| 35 | scr_writew(c, s++); |
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| 36 | } |
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| 37 | #endif |
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| 38 | |
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| 39 | #ifndef VT_BUF_HAVE_MEMCPYW |
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| 40 | static inline void scr_memcpyw(__u16 *d, const __u16 *s, unsigned int count) |
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| 41 | { |
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| 42 | count /= 2; |
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| 43 | while (count--) |
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| 44 | scr_writew(scr_readw(s++), d++); |
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| 45 | } |
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| 46 | #endif |
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| 47 | |
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| 48 | #ifndef VT_BUF_HAVE_MEMMOVEW |
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| 49 | static inline void scr_memmovew(__u16 *d, const __u16 *s, unsigned int count) |
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| 50 | { |
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| 51 | if (d < s) |
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| 52 | scr_memcpyw(d, s, count); |
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| 53 | else { |
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| 54 | count /= 2; |
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| 55 | d += count; |
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| 56 | s += count; |
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| 57 | while (count--) |
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| 58 | scr_writew(scr_readw(--s), --d); |
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| 59 | } |
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| 60 | } |
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| 61 | #endif |
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| 62 | |
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| 63 | #endif |
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