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dcons.c
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dcons.h
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dcons_crom.c
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dcons_os.c
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dcons_os.h
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Editing: dcons_os.c
/*- * SPDX-License-Identifier: BSD-4-Clause * * Copyright (C) 2003,2004 * Hidetoshi Shimokawa. 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * * This product includes software developed by Hidetoshi Shimokawa. * * 4. Neither the name of the author nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * $FreeBSD$ */ #include <sys/param.h> #include <sys/eventhandler.h> #include <sys/kdb.h> #include <gdb/gdb.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/systm.h> #include <sys/types.h> #include <sys/conf.h> #include <sys/cons.h> #include <sys/consio.h> #include <sys/tty.h> #include <sys/malloc.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/ucred.h> #include <machine/atomic.h> #include <machine/bus.h> #include <dev/dcons/dcons.h> #include <dev/dcons/dcons_os.h> #include <ddb/ddb.h> #include <sys/reboot.h> #include <sys/sysctl.h> #include <vm/vm.h> #include <vm/vm_param.h> #include <vm/pmap.h> #include "opt_dcons.h" #include "opt_kdb.h" #include "opt_gdb.h" #include "opt_ddb.h" #ifndef DCONS_POLL_HZ #define DCONS_POLL_HZ 25 #endif #ifndef DCONS_POLL_IDLE #define DCONS_POLL_IDLE 256 #endif #ifndef DCONS_BUF_SIZE #define DCONS_BUF_SIZE (16*1024) #endif #ifndef DCONS_FORCE_CONSOLE #define DCONS_FORCE_CONSOLE 0 /* Mostly for FreeBSD-4/DragonFly */ #endif #ifndef KLD_MODULE static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ #endif /* global data */ static struct dcons_global dg; struct dcons_global *dcons_conf; static int poll_hz = DCONS_POLL_HZ; static u_int poll_idle = DCONS_POLL_HZ * DCONS_POLL_IDLE; static struct dcons_softc sc[DCONS_NPORT]; static SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "Dumb Console"); SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, "dcons polling rate"); static int drv_init = 0; static struct callout dcons_callout; struct dcons_buf *dcons_buf; /* for local dconschat */ static void dcons_timeout(void *); static int dcons_drv_init(int); static cn_probe_t dcons_cnprobe; static cn_init_t dcons_cninit; static cn_term_t dcons_cnterm; static cn_getc_t dcons_cngetc; static cn_putc_t dcons_cnputc; static cn_grab_t dcons_cngrab; static cn_ungrab_t dcons_cnungrab; CONSOLE_DRIVER(dcons); #if defined(GDB) static gdb_probe_f dcons_dbg_probe; static gdb_init_f dcons_dbg_init; static gdb_term_f dcons_dbg_term; static gdb_getc_f dcons_dbg_getc; static gdb_putc_f dcons_dbg_putc; GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, dcons_dbg_getc, dcons_dbg_putc); extern struct gdb_dbgport *gdb_cur; #endif static tsw_outwakeup_t dcons_outwakeup; static tsw_free_t dcons_free; static struct ttydevsw dcons_ttydevsw = { .tsw_flags = TF_NOPREFIX, .tsw_outwakeup = dcons_outwakeup, .tsw_free = dcons_free, }; static int dcons_close_refs; #if (defined(GDB) || defined(DDB)) static int dcons_check_break(struct dcons_softc *dc, int c) { if (c < 0) return (c); #ifdef GDB if ((dc->flags & DC_GDB) != 0 && gdb_cur == &dcons_gdb_dbgport) kdb_alt_break_gdb(c, &dc->brk_state); else #endif kdb_alt_break(c, &dc->brk_state); return (c); } #else #define dcons_check_break(dc, c) (c) #endif static int dcons_os_checkc_nopoll(struct dcons_softc *dc) { int c; if (dg.dma_tag != NULL) bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); c = dcons_check_break(dc, dcons_checkc(dc)); if (dg.dma_tag != NULL) bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); return (c); } static int dcons_os_checkc(struct dcons_softc *dc) { EVENTHANDLER_INVOKE(dcons_poll, 0); return (dcons_os_checkc_nopoll(dc)); } static void dcons_os_putc(struct dcons_softc *dc, int c) { if (dg.dma_tag != NULL) bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); dcons_putc(dc, c); if (dg.dma_tag != NULL) bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); } static void dcons_free(void *xsc __unused) { /* Our deferred free has arrived, now we're waiting for one fewer. */ atomic_subtract_rel_int(&dcons_close_refs, 1); } static void dcons_outwakeup(struct tty *tp) { struct dcons_softc *dc; char ch; dc = tty_softc(tp); while (ttydisc_getc(tp, &ch, sizeof ch) != 0) dcons_os_putc(dc, ch); } static void dcons_timeout(void *v) { struct tty *tp; struct dcons_softc *dc; int i, c, polltime; for (i = 0; i < DCONS_NPORT; i ++) { dc = &sc[i]; tp = dc->tty; tty_lock(tp); while ((c = dcons_os_checkc_nopoll(dc)) != -1) { ttydisc_rint(tp, c, 0); poll_idle = 0; } ttydisc_rint_done(tp); tty_unlock(tp); } poll_idle++; polltime = hz; if (poll_idle <= (poll_hz * DCONS_POLL_IDLE)) polltime /= poll_hz; callout_reset(&dcons_callout, polltime, dcons_timeout, tp); } static void dcons_cnprobe(struct consdev *cp) { sprintf(cp->cn_name, "dcons"); #if DCONS_FORCE_CONSOLE cp->cn_pri = CN_REMOTE; #else cp->cn_pri = CN_NORMAL; #endif } static void dcons_cninit(struct consdev *cp) { dcons_drv_init(0); cp->cn_arg = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ } static void dcons_cnterm(struct consdev *cp) { } static void dcons_cngrab(struct consdev *cp) { } static void dcons_cnungrab(struct consdev *cp) { } static int dcons_cngetc(struct consdev *cp) { struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; return (dcons_os_checkc(dc)); } static void dcons_cnputc(struct consdev *cp, int c) { struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; dcons_os_putc(dc, c); } static int dcons_drv_init(int stage) { #if defined(__i386__) || defined(__amd64__) quad_t addr, size; #endif if (drv_init) return(drv_init); drv_init = -1; bzero(&dg, sizeof(dg)); dcons_conf = &dg; dg.cdev = &dcons_consdev; dg.buf = NULL; dg.size = DCONS_BUF_SIZE; #if defined(__i386__) || defined(__amd64__) if (getenv_quad("dcons.addr", &addr) > 0 && getenv_quad("dcons.size", &size) > 0) { #ifdef __i386__ vm_paddr_t pa; /* * Allow read/write access to dcons buffer. */ for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) pmap_ksetrw(PMAP_MAP_LOW + pa); invltlb(); #endif /* XXX P to V */ #ifdef __amd64__ dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); #else /* __i386__ */ dg.buf = (struct dcons_buf *)((vm_offset_t)PMAP_MAP_LOW + addr); #endif dg.size = size; if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) dg.buf = NULL; } #endif if (dg.buf != NULL) goto ok; #ifndef KLD_MODULE if (stage == 0) { /* XXX or cold */ /* * DCONS_FORCE_CONSOLE == 1 and statically linked. * called from cninit(). can't use contigmalloc yet . */ dg.buf = (struct dcons_buf *) bssbuf; dcons_init(dg.buf, dg.size, sc); } else #endif { /* * DCONS_FORCE_CONSOLE == 0 or kernel module case. * if the module is loaded after boot, * bssbuf could be non-continuous. */ dg.buf = (struct dcons_buf *) contigmalloc(dg.size, M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); if (dg.buf == NULL) return (-1); dcons_init(dg.buf, dg.size, sc); } ok: dcons_buf = dg.buf; drv_init = 1; return 0; } static int dcons_attach_port(int port, char *name, int flags) { struct dcons_softc *dc; struct tty *tp; dc = &sc[port]; tp = tty_alloc(&dcons_ttydevsw, dc); dc->flags = flags; dc->tty = tp; tty_init_console(tp, 0); tty_makedev(tp, NULL, "%s", name); return(0); } static int dcons_attach(void) { int polltime; dcons_attach_port(DCONS_CON, "dcons", 0); dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); callout_init(&dcons_callout, 1); polltime = hz / poll_hz; callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); return(0); } static int dcons_detach(int port) { struct tty *tp; struct dcons_softc *dc; dc = &sc[port]; tp = dc->tty; /* tty_rel_gone() schedules a deferred free callback, count it. */ atomic_add_int(&dcons_close_refs, 1); tty_lock(tp); tty_rel_gone(tp); return(0); } static int dcons_modevent(module_t mode, int type, void *data) { int err = 0, ret; switch (type) { case MOD_LOAD: ret = dcons_drv_init(1); if (ret != -1) dcons_attach(); if (ret == 0) { dcons_cnprobe(&dcons_consdev); dcons_cninit(&dcons_consdev); cnadd(&dcons_consdev); } break; case MOD_UNLOAD: printf("dcons: unload\n"); if (drv_init == 1) { callout_stop(&dcons_callout); cnremove(&dcons_consdev); dcons_detach(DCONS_CON); dcons_detach(DCONS_GDB); dg.buf->magic = 0; contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); } /* Wait for tty deferred free callbacks to complete. */ while (atomic_load_acq_int(&dcons_close_refs) > 0) pause_sbt("dcunld", mstosbt(50), mstosbt(10), 0); break; case MOD_SHUTDOWN: #if 0 /* Keep connection after halt */ dg.buf->magic = 0; #endif break; default: err = EOPNOTSUPP; break; } return(err); } #if defined(GDB) /* Debugger interface */ static int dcons_os_getc(struct dcons_softc *dc) { int c; while ((c = dcons_os_checkc(dc)) == -1); return (c & 0xff); } static int dcons_dbg_probe(void) { int dcons_gdb; if (getenv_int("dcons_gdb", &dcons_gdb) == 0) return (-1); return (dcons_gdb); } static void dcons_dbg_init(void) { } static void dcons_dbg_term(void) { } static void dcons_dbg_putc(int c) { struct dcons_softc *dc = &sc[DCONS_GDB]; dcons_os_putc(dc, c); } static int dcons_dbg_getc(void) { struct dcons_softc *dc = &sc[DCONS_GDB]; return (dcons_os_getc(dc)); } #endif DEV_MODULE(dcons, dcons_modevent, NULL); MODULE_VERSION(dcons, DCONS_VERSION);
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