MeowOS Dev
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65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* fbtool — fb0 helper: pan <yoffs> | blank <0|4> | copy | status.
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* Used to seed the double-buffer bug condition and clean up /dev/fb0.
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* ioctls: GETV 0x4600, GETFIX 0x4602, PAN 0x4606, BLANK 0x4611.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <stdint.h>
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#define GETV 0x4600
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#define GETFIX 0x4602
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#define PAN 0x4606
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#define BLANK 0x4611
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static int set_blank(int fd, int bl) {
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errno = 0;
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int r = ioctl(fd, BLANK, bl);
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printf("blank(%d) r=%d errno=%d\n", bl, r, errno);
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return r;
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}
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static int set_pan(int fd, int yoff) {
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unsigned char v[160]; memset(v,0,sizeof v);
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if (ioctl(fd, GETV, v) < 0) { perror("getvar"); return -1; }
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*(uint32_t*)(v+16)=0; *(uint32_t*)(v+20)=(uint32_t)yoff;
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errno = 0;
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int r = ioctl(fd, PAN, v);
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unsigned char w[160]; memset(w,0,sizeof w);
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ioctl(fd, GETV, w);
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printf("pan(%u) r=%d errno=%d yoffset now=%u\n", yoff, r, errno, *(uint32_t*)(w+20));
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return r;
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}
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static int do_copy(int fd) {
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unsigned char v[160]; memset(v,0,sizeof v);
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if (ioctl(fd, GETV, v) < 0) { perror("getvar"); return -1; }
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uint32_t yres=*(uint32_t*)(v+4), yv=*(uint32_t*)(v+12), bpp=*(uint32_t*)(v+24);
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unsigned char f[68]; memset(f,0,sizeof f);
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if (ioctl(fd, GETFIX, f) < 0) { perror("getfix"); return -1; }
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uint32_t line = *(uint32_t*)(f+44); if (!line) line = yres*(bpp/8);
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if (yv < yres) { printf("not double-buffered\n"); return -1; }
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size_t frame = (size_t)line * yres;
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unsigned char *p = mmap(NULL, frame*2, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (p == MAP_FAILED) { perror("mmap"); return -1; }
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memcpy(p+frame, p, frame);
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munmap(p, frame*2);
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printf("copy buffer0 -> buffer1 (%zu bytes)\n", frame);
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return 0;
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}
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int main(int argc, char **argv) {
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if (argc < 2) { fprintf(stderr,"usage: fbtool {blank 0|4} | {pan N} | {copy}\n"); return 2; }
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int fd = open("/dev/fb0", O_RDWR);
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if (fd < 0) { perror("open"); return 1; }
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int r = 0;
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if (!strcmp(argv[1],"blank") && argc>2) r = set_blank(fd, atoi(argv[2]));
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else if (!strcmp(argv[1],"pan") && argc>2) r = set_pan(fd, atoi(argv[2]));
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else if (!strcmp(argv[1],"copy")) r = do_copy(fd);
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else fprintf(stderr,"unknown cmd\n"), r=2;
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close(fd);
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return r<0?1:0;
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}
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