1 /* $NetBSD: palette.c,v 1.3 2003/05/17 10:38:55 isaki Exp $ */ 2 /* 3 * pelette - manipulate text colormap for NetBSD/x68k. 4 * author: Masaru Oki 5 * 6 * This software is in the Public Domain. 7 */ 8 9 #include <stdio.h> 10 #include <sys/param.h> 11 #include <sys/ioctl.h> 12 #include <sys/mman.h> 13 #include <sys/fcntl.h> 14 15 #define PALETTE_OFFSET 0x2000 /* physical addr: 0xe82000 */ 16 #define PALETTE_SIZE 0x1000 /* at least 1 page */ 17 18 int 19 main(int argc, char *argv[]) 20 { 21 int fd; 22 u_short *palette; 23 char *mapaddr; 24 int r, g, b; 25 int c = 7; 26 27 #ifdef DEBUG 28 { 29 int i; 30 printf("argc = %d\n", argc); 31 for (i = 0; i < argc; i++) 32 printf("argv[%d] = \"%s\"\n", i, argv[i]); 33 } 34 #endif 35 36 if ((fd = open("/dev/grf0", O_RDWR, 0)) < 0) { 37 perror("open"); 38 exit(1); 39 } 40 41 mapaddr = mmap(0, PALETTE_SIZE, PROT_READ | PROT_WRITE, 42 MAP_FILE | MAP_SHARED, fd, PALETTE_OFFSET); 43 if (mapaddr == (caddr_t)-1) { 44 perror("mmap"); 45 close(fd); 46 exit(1); 47 } 48 close(fd); 49 palette = (u_short *)(mapaddr + 0x0200); 50 51 if (argc == 5) { 52 c = atoi(argv[--argc]); 53 if (c > 15) { 54 printf("Usage: %s [red green blue [code]]\n", argv[0]); 55 exit(1); 56 } 57 } 58 if (argc != 4) 59 r = g = b = 31; 60 else { 61 r = atoi(argv[1]); 62 g = atoi(argv[2]); 63 b = atoi(argv[3]); 64 if (r > 31 || g > 31 || b > 31) { 65 printf("Usage: %s [red green blue [code]]\n", argv[0]); 66 r = g = b = 31; 67 } 68 } 69 #ifdef DEBUG 70 printf("color table offset = %d\n", c); 71 printf("r = %d, g = %d, b = %d\n", r, g, b); 72 #endif 73 r <<= 6; 74 g <<= 11; 75 b <<= 1; 76 77 palette[c] = r | g | b | 1; 78 79 exit(0); 80 } 81