MeowOS Dev
245bee2946
• 全新单提交：清除含敏感信息的旧历史（sudo 口令、内网 IP、SSH 密钥路径、热点 SSID、设备 MAC） • 本地开发文档/测试记录/构建脚本全部移入 gitignored 的 devdocs/ 与 scripts/build/（不入库） • 保留：MeowOS 源码（launcher/watchdog/bootmenu/meow_svcd/SDK）、项目规范文档、mips-repo 增补组件：SDK 统一日志+通知 API、meow_svcd 服务管理器、mips-repo 软件仓库
81 lines
3.3 KiB
C
81 lines
3.3 KiB
C
/* fbprobe.c — inspect /dev/fb0 geometry & current pan position.
|
|
* Device-verified ioctl numbers (do NOT swap): FBIOGET_VSCREENINFO=0x4600,
|
|
* FBIOGET_FSCREENINFO=0x4602, FBIOBLANK=0x4611.
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
#include <errno.h>
|
|
#include <stdint.h>
|
|
|
|
#define FBIOGET_VSCREENINFO 0x4600
|
|
#define FBIOGET_FSCREENINFO 0x4602
|
|
#define FBIOBLANK 0x4611
|
|
#define FBIO_PAN_DISPLAY 0x4606
|
|
#define FBIO_WAITFORVSYNC 0x4620
|
|
|
|
int main(void)
|
|
{
|
|
int fd = open("/dev/fb0", O_RDWR);
|
|
if (fd < 0) { perror("open /dev/fb0"); return 1; }
|
|
|
|
unsigned char v[160], f[68];
|
|
memset(v, 0, sizeof v); memset(f, 0, sizeof f);
|
|
if (ioctl(fd, 0x4600, v) < 0) { perror("vscreeninfo(0x4600)"); return 1; }
|
|
if (ioctl(fd, 0x4602, f) < 0) { perror("fscreeninfo(0x4602)"); return 1; }
|
|
|
|
uint32_t xres = *(uint32_t*)(v + 0);
|
|
uint32_t yres = *(uint32_t*)(v + 4);
|
|
uint32_t xv = *(uint32_t*)(v + 8);
|
|
uint32_t yv = *(uint32_t*)(v + 12);
|
|
uint32_t xoff = *(uint32_t*)(v + 16);
|
|
uint32_t yoff = *(uint32_t*)(v + 20);
|
|
uint32_t bpp = *(uint32_t*)(v + 24);
|
|
uint32_t vmode = *(uint32_t*)(v + 80);
|
|
|
|
uint32_t smem_len = *(uint32_t*)(f + 20);
|
|
uint32_t visual = *(uint32_t*)(f + 32);
|
|
uint16_t xs = *(uint16_t*)(f + 36);
|
|
uint16_t ys = *(uint16_t*)(f + 38);
|
|
uint32_t line_len = *(uint32_t*)(f + 44);
|
|
uint32_t type = *(uint32_t*)(f + 24);
|
|
|
|
printf("V: xres=%u yres=%u xres_v=%u yres_v=%u xoffset=%u yoffset=%u bpp=%u vmode=%u\n",
|
|
xres, yres, xv, yv, xoff, yoff, bpp, vmode);
|
|
printf("V: red(offset%u,len%u) green(off%u,len%u) blue(off%u,len%u) transp(off%u,len%u)\n",
|
|
*(uint32_t*)(v+28)&0xFF, *(uint32_t*)(v+28)>>8,
|
|
*(uint32_t*)(v+32)&0xFF, *(uint32_t*)(v+32)>>8,
|
|
*(uint32_t*)(v+36)&0xFF, *(uint32_t*)(v+36)>>8,
|
|
*(uint32_t*)(v+40)&0xFF, *(uint32_t*)(v+40)>>8);
|
|
printf("F: id='%.16s' smem_len=%u type=%u visual=%u xpanstep=%u ypanstep=%u line_length=%u\n",
|
|
(char*)f, smem_len, type, visual, xs, ys, line_len);
|
|
|
|
unsigned long one = (unsigned long)line_len * yres;
|
|
printf("frame size (line*yres) = %lu ; 2*frame = %lu ; smem_len = %u\n",
|
|
one, one * 2, smem_len);
|
|
printf("DOUBLE-BUFFER? %s\n",
|
|
(smem_len >= one * 2) ? "YES (>= 2 frames in smem)" : "single (1 frame)");
|
|
printf("YRES_VIRTUAL = %u ; yoffset = %u ; displayed buffer index = %u\n",
|
|
yv, yoff, yv > 0 ? (yoff / (yres ? yres : 1)) : 0);
|
|
printf("display starts at byte %u (=%u*line_len)\n", yoff * line_len, yoff);
|
|
printf("=> visible window x=%u..%u y=%u..%u (of %ux%u virtual)\n",
|
|
xoff, xoff + xres, yoff, yoff + yres, xv, yv);
|
|
|
|
/* try FBIOPAN_DISPLAY to read back set-able + WAITFORVSYNC presence */
|
|
unsigned char pan[160];
|
|
memcpy(pan, v, sizeof pan);
|
|
pan[20] = 0; pan[16] = 0; /* yoffset=0 xoffset=0, only to test */
|
|
errno = 0;
|
|
/* don't actually pan (avoid disturbing the player); just report errno of a
|
|
* no-op probe would need a real pan. Instead check WAITFORVSYNC support. */
|
|
uint32_t zero = 0;
|
|
errno = 0;
|
|
int wfs = ioctl(fd, 0x4620, &zero);
|
|
printf("FBIO_WAITFORVSYNC(0x4620) = %d (errno=%d %s)\n", wfs, errno, strerror(errno));
|
|
close(fd);
|
|
return 0;
|
|
}
|