opal_dbg.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (C) 2019 Leandro Lupori
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   21  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   22  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   23  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   24  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/linker_set.h>
   31 #include <sys/param.h>
   32 #include <sys/types.h>
   33 
   34 struct thread;
   35 
   36 #include <vm/vm.h>
   37 #include <vm/pmap.h>
   38 
   39 #include <dev/ofw/openfirm.h>
   40 #include <gdb/gdb.h>
   41 
   42 #include "opal.h"
   43 
   44 static gdb_probe_f uart_opal_dbg_probe;
   45 static gdb_init_f uart_opal_dbg_init;
   46 static gdb_term_f uart_opal_dbg_term;
   47 static gdb_getc_f uart_opal_dbg_getc;
   48 static gdb_putc_f uart_opal_dbg_putc;
   49 
   50 GDB_DBGPORT(uart_opal, uart_opal_dbg_probe,
   51     uart_opal_dbg_init, uart_opal_dbg_term,
   52     uart_opal_dbg_getc, uart_opal_dbg_putc);
   53 
   54 static int64_t termnum;
   55 
   56 static int
   57 uart_opal_dbg_probe(void)
   58 {
   59         char buf[64];
   60         cell_t reg;
   61         phandle_t dev;
   62 
   63         if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
   64                 return (-1);
   65         if ((dev = OF_finddevice(buf)) == -1)
   66                 return (-1);
   67 
   68         if (OF_getprop(dev, "device_type", buf, sizeof(buf)) == -1)
   69                 return (-1);
   70         if (strcmp(buf, "serial") != 0)
   71                 return (-1);
   72 
   73         if (OF_getprop(dev, "compatible", buf, sizeof(buf)) == -1)
   74                 return (-1);
   75         if (strcmp(buf, "ibm,opal-console-raw") != 0)
   76                 return (-1);
   77 
   78         reg = ~0U;
   79         OF_getencprop(dev, "reg", &reg, sizeof(reg));
   80         if (reg == ~0U)
   81                 return (-1);
   82         termnum = reg;
   83 
   84         return (0);
   85 }
   86 
   87 static void
   88 uart_opal_dbg_init(void)
   89 {
   90 }
   91 
   92 static void
   93 uart_opal_dbg_term(void)
   94 {
   95 }
   96 
   97 static int
   98 uart_opal_dbg_getc(void)
   99 {
  100         char c;
  101         int err;
  102         int64_t len;
  103         uint64_t lenp, bufp;
  104 
  105         len = 1;
  106         if (pmap_bootstrapped) {
  107                 lenp = vtophys(&len);
  108                 bufp = vtophys(&c);
  109         } else {
  110                 lenp = (uint64_t)&len;
  111                 bufp = (uint64_t)&c;
  112         }
  113 
  114         err = opal_call(OPAL_CONSOLE_READ, termnum, lenp, bufp);
  115         if (err != OPAL_SUCCESS || len != 1)
  116                 return (-1);
  117 
  118         opal_call(OPAL_POLL_EVENTS, NULL);
  119 
  120         return (c);
  121 }
  122 
  123 static void
  124 uart_opal_dbg_putc(int c)
  125 {
  126         char ch;
  127         int err;
  128         int64_t len;
  129         uint64_t lenp, bufp;
  130 
  131         ch = (unsigned char)c;
  132         len = 1;
  133         if (pmap_bootstrapped) {
  134                 lenp = vtophys(&len);
  135                 bufp = vtophys(&ch);
  136         } else {
  137                 lenp = (uint64_t)&len;
  138                 bufp = (uint64_t)&ch;
  139         }
  140 
  141         for (;;) {
  142                 err = opal_call(OPAL_CONSOLE_WRITE, termnum, lenp, bufp);
  143                 /* Clear FIFO if needed. */
  144                 if (err == OPAL_BUSY_EVENT)
  145                         opal_call(OPAL_POLL_EVENTS, NULL);
  146                 else
  147                         /* break on success or unrecoverable errors */
  148                         break;
  149         }
  150         DELAY(100);
  151 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powernv/opal_dbg.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powernv/opal_dbg.c