On 2020/09/29 2:59, Martin Hostettler wrote: > On Sun, Sep 27, 2020 at 08:46:30PM +0900, Tetsuo Handa wrote: >> VT_RESIZEX was introduced in Linux 1.3.3, but it is unclear that what >> comes to the "+ more" part, and I couldn't find a user of VT_RESIZEX. >> > > It seems this is/was used by "svgatextmode" which seems to be at > http://www.ibiblio.org/pub/Linux/utils/console/ > > Not sure if that kind of software still has a chance to work nowadays. > Thanks for the information. It seems that v.v_vlin = curr_textmode->VDisplay / (MOFLG_ISSET(curr_textmode, ATTR_DOUBLESCAN) ? 2 : 1) and v.v_clin = curr_textmode->FontHeight . Thus, v.v_clin is font's height and seems to be non-zero. But according to https://bugs.gentoo.org/19485 , people are using kernel framebuffer instead. ---------- SVGATextMode-1.10/SVGATextMode.c ---------- /* * Resize the screen. Still needs LOTS more error checking to avoid dropping out in the middle, leaving * the user with a garbled screen. * * sresize will be TRUE when resizing tty's should be forced (due to the 2nd attempt do_VT_RESIZE will do * when not enough memory is free). * */ /* * ALWAYS do a VT_RESIZE, even if we already did a VT_RESIZEX on a 1.3.3 or higher kernel, * until those kernel programmers make this unambiguous */ if (do_VT_RESIZE(curr_textmode->cols, curr_textmode->rows, resize1x1)) sresize=TRUE; if (check_kernel_version(1,3,3, "VT_RESIZEX")) { /* * VDisplay must de divided by 2 for DoubleScan modes, * or VT_RESIZEX will fail -- until someone fixes the kernel * so it understands about doublescan modes. */ if (do_VT_RESIZEX(curr_textmode->cols, curr_textmode->rows, curr_textmode->VDisplay / (MOFLG_ISSET(curr_textmode, ATTR_DOUBLESCAN) ? 2 : 1), curr_textmode->FontHeight, curr_textmode->HDisplay/8*curr_textmode->FontWidth, curr_textmode->FontWidth, resize1x1)) sresize=TRUE; } ---------- SVGATextMode-1.10/ttyresize.c ---------- /* * if VT_RESIZEX not supported (i.e. when compiling on < 1.3.3 kernels), define it. * this is just te keep the compiler happy */ #ifndef VT_RESIZEX # define VT_RESIZEX 0x560A typedef struct vt_consize { ushort v_rows; ushort v_cols; ushort v_vlin; ushort v_clin; ushort v_vcol; ushort v_ccol; } vt_consize; #endif int do_VT_RESIZEX(int cols, int rows, int vlin, int clin, int vcol, int ccol, int allow1x1) { struct vt_consize my_vt_size; /* passes the new screen size on to the kernel */ struct vt_consize dummy_vt_size = { 1 , 1 , 1 , 1 , 1 , 1 }; int ram_needed = cols * rows * 2 * MAX_NR_CONSOLES; my_vt_size.v_rows = rows; my_vt_size.v_cols = cols; my_vt_size.v_vlin = vlin; my_vt_size.v_clin = clin; my_vt_size.v_vcol = vcol; my_vt_size.v_ccol = ccol; PDEBUG(("VT_RESIZEX(cols=%d,rows=%d,vlin=%d,clin=%d,vcol=%d,ccol=%d)\n",cols, rows, vlin, clin, vcol, ccol)); return(generic_VT_RESIZE(&my_vt_size, &dummy_vt_size, allow1x1, ram_needed, VT_RESIZEX, "VT_RESIZEX")); } _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
