/* $NetBSD: wsdisplay_vcons.c,v 1.16 2008/04/28 20:24:01 martin Exp $ */ /*- * Copyright (c) 2005, 2006 Michael Lorenz * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: wsdisplay_vcons.c,v 1.16 2008/04/28 20:24:01 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "opt_wsemul.h" #include "opt_wsdisplay_compat.h" #include "opt_vcons.h" static void vcons_dummy_init_screen(void *, struct vcons_screen *, int, long *); static int vcons_ioctl(void *, void *, u_long, void *, int, struct lwp *); static int vcons_alloc_screen(void *, const struct wsscreen_descr *, void **, int *, int *, long *); static void vcons_free_screen(void *, void *); static int vcons_show_screen(void *, void *, int, void (*)(void *, int, int), void *); #ifdef WSDISPLAY_SCROLLSUPPORT static void vcons_scroll(void *, void *, int); static void vcons_do_scroll(struct vcons_screen *); #endif static void vcons_do_switch(void *); /* methods that work only on text buffers */ static void vcons_copycols_buffer(void *, int, int, int, int); static void vcons_erasecols_buffer(void *, int, int, int, long); static void vcons_copyrows_buffer(void *, int, int, int); static void vcons_eraserows_buffer(void *, int, int, long); static void vcons_putchar_buffer(void *, int, int, u_int, long); /* * actual wrapper methods which call both the _buffer ones above and the * driver supplied ones to do the drawing */ static void vcons_copycols(void *, int, int, int, int); static void vcons_erasecols(void *, int, int, int, long); static void vcons_copyrows(void *, int, int, int); static void vcons_eraserows(void *, int, int, long); static void vcons_putchar(void *, int, int, u_int, long); static void vcons_cursor(void *, int, int, int); /* support for reading/writing text buffers. For wsmoused */ static int vcons_putwschar(struct vcons_screen *, struct wsdisplay_char *); static int vcons_getwschar(struct vcons_screen *, struct wsdisplay_char *); static void vcons_lock(struct vcons_screen *); static void vcons_unlock(struct vcons_screen *); #ifdef VCONS_SWITCH_ASYNC static void vcons_kthread(void *); #endif int vcons_init(struct vcons_data *vd, void *cookie, struct wsscreen_descr *def, struct wsdisplay_accessops *ao) { /* zero out everything so we can rely on untouched fields being 0 */ memset(vd, 0, sizeof(struct vcons_data)); vd->cookie = cookie; vd->init_screen = vcons_dummy_init_screen; vd->show_screen_cb = NULL; /* keep a copy of the accessops that we replace below with our * own wrappers */ vd->ioctl = ao->ioctl; /* configure the accessops */ ao->ioctl = vcons_ioctl; ao->alloc_screen = vcons_alloc_screen; ao->free_screen = vcons_free_screen; ao->show_screen = vcons_show_screen; #ifdef WSDISPLAY_SCROLLSUPPORT ao->scroll = vcons_scroll; #endif LIST_INIT(&vd->screens); vd->active = NULL; vd->wanted = NULL; vd->currenttype = def; callout_init(&vd->switch_callout, 0); callout_setfunc(&vd->switch_callout, vcons_do_switch, vd); /* * a lock to serialize access to the framebuffer. * when switching screens we need to make sure there's no rasops * operation in progress */ #ifdef DIAGNOSTIC vd->switch_poll_count = 0; #endif #ifdef VCONS_SWITCH_ASYNC kthread_create(PRI_NONE, 0, NULL, vcons_kthread, vd, &vd->redraw_thread, "vcons_draw"); #endif return 0; } static void vcons_lock(struct vcons_screen *scr) { #ifdef VCONS_PARANOIA int s; s = splhigh(); #endif SCREEN_BUSY(scr); #ifdef VCONS_PARANOIA splx(s); #endif } static void vcons_unlock(struct vcons_screen *scr) { #ifdef VCONS_PARANOIA int s; s = splhigh(); #endif SCREEN_IDLE(scr); #ifdef VCONS_PARANOIA splx(s); #endif #ifdef VCONS_SWITCH_ASYNC wakeup(&scr->scr_vd->done_drawing); #endif } static void vcons_dummy_init_screen(void *cookie, struct vcons_screen *scr, int exists, long *defattr) { /* * default init_screen() method. * Needs to be overwritten so we bitch and whine in case anyone ends * up in here. */ printf("vcons_init_screen: dummy function called. Your driver is " "supposed to supply a replacement for proper operation\n"); } int vcons_init_screen(struct vcons_data *vd, struct vcons_screen *scr, int existing, long *defattr) { struct rasops_info *ri = &scr->scr_ri; int cnt, i; scr->scr_cookie = vd->cookie; scr->scr_vd = scr->scr_origvd = vd; scr->scr_busy = 0; /* * call the driver-supplied init_screen function which is expected * to set up rasops_info, override cursor() and probably others */ vd->init_screen(vd->cookie, scr, existing, defattr); /* * save the non virtual console aware rasops and replace them with * our wrappers */ vd->eraserows = ri->ri_ops.eraserows; vd->copyrows = ri->ri_ops.copyrows; vd->erasecols = ri->ri_ops.erasecols; vd->copycols = ri->ri_ops.copycols; vd->putchar = ri->ri_ops.putchar; vd->cursor = ri->ri_ops.cursor; ri->ri_ops.eraserows = vcons_eraserows; ri->ri_ops.copyrows = vcons_copyrows; ri->ri_ops.erasecols = vcons_erasecols; ri->ri_ops.copycols = vcons_copycols; ri->ri_ops.putchar = vcons_putchar; ri->ri_ops.cursor = vcons_cursor; ri->ri_hw = scr; /* * we allocate both chars and attributes in one chunk, attributes first * because they have the (potentially) bigger alignment */ #ifdef WSDISPLAY_SCROLLSUPPORT cnt = (ri->ri_rows + WSDISPLAY_SCROLLBACK_LINES) * ri->ri_cols; scr->scr_lines_in_buffer = WSDISPLAY_SCROLLBACK_LINES; scr->scr_current_line = 0; scr->scr_line_wanted = 0; scr->scr_offset_to_zero = ri->ri_cols * WSDISPLAY_SCROLLBACK_LINES; scr->scr_current_offset = scr->scr_offset_to_zero; #else cnt = ri->ri_rows * ri->ri_cols; #endif scr->scr_attrs = (long *)malloc(cnt * (sizeof(long) + sizeof(uint16_t)), M_DEVBUF, M_WAITOK); if (scr->scr_attrs == NULL) return ENOMEM; scr->scr_chars = (uint16_t *)&scr->scr_attrs[cnt]; ri->ri_ops.allocattr(ri, WS_DEFAULT_FG, WS_DEFAULT_BG, 0, defattr); scr->scr_defattr = *defattr; /* * fill the attribute buffer with *defattr, chars with 0x20 * since we don't know if the driver tries to mimic firmware output or * reset everything we do nothing to VRAM here, any driver that feels * the need to clear screen or something will have to do it on its own * Additional screens will start out in the background anyway so * cleaning or not only really affects the initial console screen */ for (i = 0; i < cnt; i++) { scr->scr_attrs[i] = *defattr; scr->scr_chars[i] = 0x20; } if(vd->active == NULL) { vd->active = scr; SCREEN_VISIBLE(scr); } if (existing) { SCREEN_VISIBLE(scr); vd->active = scr; } else { SCREEN_INVISIBLE(scr); } LIST_INSERT_HEAD(&vd->screens, scr, next); return 0; } static void vcons_do_switch(void *arg) { struct vcons_data *vd = arg; struct vcons_screen *scr, *oldscr; scr = vd->wanted; if (!scr) { printf("vcons_switch_screen: disappeared\n"); vd->switch_cb(vd->switch_cb_arg, EIO, 0); return; } oldscr = vd->active; /* can be NULL! */ /* * if there's an old, visible screen we mark it invisible and wait * until it's not busy so we can safely switch */ if (oldscr != NULL) { SCREEN_INVISIBLE(oldscr); if (SCREEN_IS_BUSY(oldscr)) { callout_schedule(&vd->switch_callout, 1); #ifdef DIAGNOSTIC /* bitch if we wait too long */ vd->switch_poll_count++; if (vd->switch_poll_count > 100) { panic("vcons: screen still busy"); } #endif return; } /* invisible screen -> no visible cursor image */ oldscr->scr_ri.ri_flg &= ~RI_CURSOR; #ifdef DIAGNOSTIC vd->switch_poll_count = 0; #endif } if (scr == oldscr) return; #ifdef DIAGNOSTIC if (SCREEN_IS_VISIBLE(scr)) printf("vcons_switch_screen: already active"); #endif #ifdef notyet if (vd->currenttype != type) { vcons_set_screentype(vd, type); vd->currenttype = type; } #endif SCREEN_VISIBLE(scr); vd->active = scr; vd->wanted = NULL; if (vd->show_screen_cb != NULL) vd->show_screen_cb(scr); if ((scr->scr_flags & VCONS_NO_REDRAW) == 0) vcons_redraw_screen(scr); if (vd->switch_cb) vd->switch_cb(vd->switch_cb_arg, 0, 0); } void vcons_redraw_screen(struct vcons_screen *scr) { uint16_t *charptr = scr->scr_chars; long *attrptr = scr->scr_attrs; struct rasops_info *ri = &scr->scr_ri; int i, j, offset; vcons_lock(scr); if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) { /* * only clear the screen when RI_FULLCLEAR is set since we're * going to overwrite every single character cell anyway */ if (ri->ri_flg & RI_FULLCLEAR) { scr->scr_vd->eraserows(ri, 0, ri->ri_rows, scr->scr_defattr); } /* redraw the screen */ #ifdef WSDISPLAY_SCROLLSUPPORT offset = scr->scr_current_offset; #else offset = 0; #endif for (i = 0; i < ri->ri_rows; i++) { for (j = 0; j < ri->ri_cols; j++) { /* * no need to use the wrapper function - we * don't change any characters or attributes * and we already made sure the screen we're * working on is visible */ scr->scr_vd->putchar(ri, i, j, charptr[offset], attrptr[offset]); offset++; } } ri->ri_flg &= ~RI_CURSOR; scr->scr_vd->cursor(ri, 1, ri->ri_crow, ri->ri_ccol); } vcons_unlock(scr); } static int vcons_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, struct lwp *l) { struct vcons_data *vd = v; int error; switch (cmd) { case WSDISPLAYIO_GETWSCHAR: error = vcons_getwschar((struct vcons_screen *)vs, (struct wsdisplay_char *)data); break; case WSDISPLAYIO_PUTWSCHAR: error = vcons_putwschar((struct vcons_screen *)vs, (struct wsdisplay_char *)data); break; default: if (vd->ioctl != NULL) error = (*vd->ioctl)(v, vs, cmd, data, flag, l); else error = EPASSTHROUGH; } return error; } static int vcons_alloc_screen(void *v, const struct wsscreen_descr *type, void **cookiep, int *curxp, int *curyp, long *defattrp) { struct vcons_data *vd = v; struct vcons_screen *scr; int ret; scr = malloc(sizeof(struct vcons_screen), M_DEVBUF, M_WAITOK | M_ZERO); if (scr == NULL) return ENOMEM; scr->scr_flags = 0; scr->scr_status = 0; scr->scr_busy = 0; scr->scr_type = type; ret = vcons_init_screen(vd, scr, 0, defattrp); if (ret != 0) { free(scr, M_DEVBUF); return ret; } if (vd->active == NULL) { SCREEN_VISIBLE(scr); vd->active = scr; vd->currenttype = type; } *cookiep = scr; *curxp = scr->scr_ri.ri_ccol; *curyp = scr->scr_ri.ri_crow; return 0; } static void vcons_free_screen(void *v, void *cookie) { struct vcons_data *vd = v; struct vcons_screen *scr = cookie; vcons_lock(scr); /* there should be no rasops activity here */ LIST_REMOVE(scr, next); if ((scr->scr_flags & VCONS_SCREEN_IS_STATIC) == 0) { free(scr->scr_attrs, M_DEVBUF); free(scr, M_DEVBUF); } else { /* * maybe we should just restore the old rasops_info methods * and free the character/attribute buffer here? */ #ifdef VCONS_DEBUG panic("vcons_free_screen: console"); #else printf("vcons_free_screen: console\n"); #endif } if (vd->active == scr) vd->active = NULL; } static int vcons_show_screen(void *v, void *cookie, int waitok, void (*cb)(void *, int, int), void *cb_arg) { struct vcons_data *vd = v; struct vcons_screen *scr; scr = cookie; if (scr == vd->active) return 0; vd->wanted = scr; vd->switch_cb = cb; vd->switch_cb_arg = cb_arg; #ifdef VCONS_SWITCH_ASYNC wakeup(&vd->start_drawing); return EAGAIN; #else if (cb) { callout_schedule(&vd->switch_callout, 0); return EAGAIN; } vcons_do_switch(vd); return 0; #endif } /* wrappers for rasops_info methods */ static void vcons_copycols_buffer(void *cookie, int row, int srccol, int dstcol, int ncols) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; int from = srccol + row * ri->ri_cols; int to = dstcol + row * ri->ri_cols; #ifdef WSDISPLAY_SCROLLSUPPORT int offset; offset = scr->scr_offset_to_zero; memmove(&scr->scr_attrs[offset + to], &scr->scr_attrs[offset + from], ncols * sizeof(long)); memmove(&scr->scr_chars[offset + to], &scr->scr_chars[offset + from], ncols * sizeof(uint16_t)); #else memmove(&scr->scr_attrs[to], &scr->scr_attrs[from], ncols * sizeof(long)); memmove(&scr->scr_chars[to], &scr->scr_chars[from], ncols * sizeof(uint16_t)); #endif } static void vcons_copycols(void *cookie, int row, int srccol, int dstcol, int ncols) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; vcons_copycols_buffer(cookie, row, srccol, dstcol, ncols); vcons_lock(scr); if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) { scr->scr_vd->copycols(cookie, row, srccol, dstcol, ncols); } vcons_unlock(scr); } static void vcons_erasecols_buffer(void *cookie, int row, int startcol, int ncols, long fillattr) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; int start = startcol + row * ri->ri_cols; int end = start + ncols, i; #ifdef WSDISPLAY_SCROLLSUPPORT int offset; offset = scr->scr_offset_to_zero; for (i = start; i < end; i++) { scr->scr_attrs[offset + i] = fillattr; scr->scr_chars[offset + i] = 0x20; } #else for (i = start; i < end; i++) { scr->scr_attrs[i] = fillattr; scr->scr_chars[i] = 0x20; } #endif } static void vcons_erasecols(void *cookie, int row, int startcol, int ncols, long fillattr) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; vcons_erasecols_buffer(cookie, row, startcol, ncols, fillattr); vcons_lock(scr); if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) { scr->scr_vd->erasecols(cookie, row, startcol, ncols, fillattr); } vcons_unlock(scr); } static void vcons_copyrows_buffer(void *cookie, int srcrow, int dstrow, int nrows) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; int from, to, len; #ifdef WSDISPLAY_SCROLLSUPPORT int offset; offset = scr->scr_offset_to_zero; /* do we need to scroll the back buffer? */ if (dstrow == 0) { from = ri->ri_cols * srcrow; to = ri->ri_cols * dstrow; memmove(&scr->scr_attrs[to], &scr->scr_attrs[from], scr->scr_offset_to_zero * sizeof(long)); memmove(&scr->scr_chars[to], &scr->scr_chars[from], scr->scr_offset_to_zero * sizeof(uint16_t)); } from = ri->ri_cols * srcrow + offset; to = ri->ri_cols * dstrow + offset; len = ri->ri_cols * nrows; #else from = ri->ri_cols * srcrow; to = ri->ri_cols * dstrow; len = ri->ri_cols * nrows; #endif memmove(&scr->scr_attrs[to], &scr->scr_attrs[from], len * sizeof(long)); memmove(&scr->scr_chars[to], &scr->scr_chars[from], len * sizeof(uint16_t)); } static void vcons_copyrows(void *cookie, int srcrow, int dstrow, int nrows) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; vcons_copyrows_buffer(cookie, srcrow, dstrow, nrows); vcons_lock(scr); if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) { scr->scr_vd->copyrows(cookie, srcrow, dstrow, nrows); } vcons_unlock(scr); } static void vcons_eraserows_buffer(void *cookie, int row, int nrows, long fillattr) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; int start, end, i; #ifdef WSDISPLAY_SCROLLSUPPORT int offset; offset = scr->scr_offset_to_zero; start = ri->ri_cols * row + offset; end = ri->ri_cols * (row + nrows) + offset; #else start = ri->ri_cols * row; end = ri->ri_cols * (row + nrows); #endif for (i = start; i < end; i++) { scr->scr_attrs[i] = fillattr; scr->scr_chars[i] = 0x20; } } static void vcons_eraserows(void *cookie, int row, int nrows, long fillattr) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; vcons_eraserows_buffer(cookie, row, nrows, fillattr); vcons_lock(scr); if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) { scr->scr_vd->eraserows(cookie, row, nrows, fillattr); } vcons_unlock(scr); } static void vcons_putchar_buffer(void *cookie, int row, int col, u_int c, long attr) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; int pos; #ifdef WSDISPLAY_SCROLLSUPPORT int offset; offset = scr->scr_offset_to_zero; if ((row >= 0) && (row < ri->ri_rows) && (col >= 0) && (col < ri->ri_cols)) { pos = col + row * ri->ri_cols; scr->scr_attrs[pos + offset] = attr; scr->scr_chars[pos + offset] = c; } #else if ((row >= 0) && (row < ri->ri_rows) && (col >= 0) && (col < ri->ri_cols)) { pos = col + row * ri->ri_cols; scr->scr_attrs[pos] = attr; scr->scr_chars[pos] = c; } #endif } static void vcons_putchar(void *cookie, int row, int col, u_int c, long attr) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; vcons_putchar_buffer(cookie, row, col, c, attr); vcons_lock(scr); if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) { scr->scr_vd->putchar(cookie, row, col, c, attr); } vcons_unlock(scr); } static void vcons_cursor(void *cookie, int on, int row, int col) { struct rasops_info *ri = cookie; struct vcons_screen *scr = ri->ri_hw; vcons_lock(scr); if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) { scr->scr_vd->cursor(cookie, on, row, col); } else { scr->scr_ri.ri_crow = row; scr->scr_ri.ri_ccol = col; } vcons_unlock(scr); } /* methods to read/write characters via ioctl() */ static int vcons_putwschar(struct vcons_screen *scr, struct wsdisplay_char *wsc) { long attr; struct rasops_info *ri; KASSERT(scr != NULL && wsc != NULL); ri = &scr->scr_ri; if (__predict_false((unsigned int)wsc->col > ri->ri_cols || (unsigned int)wsc->row > ri->ri_rows)) return (EINVAL); if ((wsc->row >= 0) && (wsc->row < ri->ri_rows) && (wsc->col >= 0) && (wsc->col < ri->ri_cols)) { ri->ri_ops.allocattr(ri, wsc->foreground, wsc->background, wsc->flags, &attr); vcons_putchar(ri, wsc->row, wsc->col, wsc->letter, attr); #ifdef VCONS_DEBUG printf("vcons_putwschar(%d, %d, %x, %lx\n", wsc->row, wsc->col, wsc->letter, attr); #endif return 0; } else return EINVAL; } static int vcons_getwschar(struct vcons_screen *scr, struct wsdisplay_char *wsc) { int offset; long attr; struct rasops_info *ri; KASSERT(scr != NULL && wsc != NULL); ri = &scr->scr_ri; if ((wsc->row >= 0) && (wsc->row < ri->ri_rows) && (wsc->col >= 0) && (wsc->col < ri->ri_cols)) { offset = ri->ri_cols * wsc->row + wsc->col; #ifdef WSDISPLAY_SCROLLSUPPORT offset += scr->scr_offset_to_zero; #endif wsc->letter = scr->scr_chars[offset]; attr = scr->scr_attrs[offset]; /* * this is ugly. We need to break up an attribute into colours and * flags but there's no rasops method to do that so we must rely on * the 'canonical' encoding. */ #ifdef VCONS_DEBUG printf("vcons_getwschar: %d, %d, %x, %lx\n", wsc->row, wsc->col, wsc->letter, attr); #endif wsc->foreground = (attr >> 24) & 0xff; wsc->background = (attr >> 16) & 0xff; wsc->flags = attr & 0xff; return 0; } else return EINVAL; } #ifdef WSDISPLAY_SCROLLSUPPORT static void vcons_scroll(void *cookie, void *vs, int where) { struct vcons_screen *scr = vs; if (where == 0) { scr->scr_line_wanted = 0; } else { scr->scr_line_wanted = scr->scr_line_wanted - where; if (scr->scr_line_wanted < 0) scr->scr_line_wanted = 0; if (scr->scr_line_wanted > scr->scr_lines_in_buffer) scr->scr_line_wanted = scr->scr_lines_in_buffer; } if (scr->scr_line_wanted != scr->scr_current_line) { vcons_do_scroll(scr); } } static void vcons_do_scroll(struct vcons_screen *scr) { int dist, from, to, num; int r_offset, r_start; int i, j; if (scr->scr_line_wanted == scr->scr_current_line) return; dist = scr->scr_line_wanted - scr->scr_current_line; scr->scr_current_line = scr->scr_line_wanted; scr->scr_current_offset = scr->scr_ri.ri_cols * (scr->scr_lines_in_buffer - scr->scr_current_line); if (abs(dist) >= scr->scr_ri.ri_rows) { vcons_redraw_screen(scr); return; } /* scroll and redraw only what we really have to */ if (dist > 0) { /* we scroll down */ from = 0; to = dist; num = scr->scr_ri.ri_rows - dist; /* now the redraw parameters */ r_offset = scr->scr_current_offset; r_start = 0; } else { /* scrolling up */ to = 0; from = -dist; num = scr->scr_ri.ri_rows + dist; r_offset = scr->scr_current_offset + num * scr->scr_ri.ri_cols; r_start = num; } scr->scr_vd->copyrows(scr, from, to, num); for (i = 0; i < abs(dist); i++) { for (j = 0; j < scr->scr_ri.ri_cols; j++) { scr->scr_vd->putchar(scr, i + r_start, j, scr->scr_chars[r_offset], scr->scr_attrs[r_offset]); r_offset++; } } if (scr->scr_line_wanted == 0) { /* this was a reset - need to draw the cursor */ scr->scr_ri.ri_flg &= ~RI_CURSOR; scr->scr_vd->cursor(scr, 1, scr->scr_ri.ri_crow, scr->scr_ri.ri_ccol); } } #endif /* WSDISPLAY_SCROLLSUPPORT */ /* async drawing using a kernel thread */ #ifdef VCONS_SWITCH_ASYNC static void vcons_kthread(void *cookie) { struct vcons_data *vd = cookie; struct vcons_screen *scr; int sec = hz; while (1) { tsleep(&vd->start_drawing, 0, "vc_idle", sec); if ((vd->wanted != vd->active) && (vd->wanted != NULL)) { /* * we need to switch screens * so first we mark the active screen as invisible * and wait until it's idle */ scr = vd->wanted; SCREEN_INVISIBLE(vd->active); while (SCREEN_IS_BUSY(vd->active)) { tsleep(&vd->done_drawing, 0, "vc_wait", sec); } /* * now we mark the wanted screen busy so nobody * messes around while we redraw it */ vd->active = scr; vd->wanted = NULL; SCREEN_VISIBLE(scr); if (vd->show_screen_cb != NULL) vd->show_screen_cb(scr); if ((scr->scr_flags & VCONS_NO_REDRAW) == 0) vcons_redraw_screen(scr); if (vd->switch_cb) vd->switch_cb(vd->switch_cb_arg, 0, 0); } } } #endif /* VCONS_SWITCH_ASYNC */