FreeBSD/Linux Kernel Cross Reference
sys/powerpc/pseries/phyp_dbg.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (C) 2019 Leandro Lupori
      *
      * 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 AUTHOR ``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 TOOLS GMBH 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 <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/linker_set.h>
    
    #include <dev/ofw/openfirm.h>
    #include <gdb/gdb.h>
    
    #include "phyp-hvcall.h"
    
    static gdb_probe_f uart_phyp_dbg_probe;
    static gdb_init_f uart_phyp_dbg_init;
    static gdb_term_f uart_phyp_dbg_term;
    static gdb_getc_f uart_phyp_dbg_getc;
    static gdb_putc_f uart_phyp_dbg_putc;
    
    GDB_DBGPORT(uart_phyp, uart_phyp_dbg_probe,
        uart_phyp_dbg_init, uart_phyp_dbg_term,
        uart_phyp_dbg_getc, uart_phyp_dbg_putc);
    
    static struct uart_phyp_dbgport {
            cell_t vtermid;
            union {
                    uint64_t u64[2];
                    char str[16];
            } inbuf;
            uint64_t inbuflen;
    } dbgport;
    
    static int
    uart_phyp_dbg_probe(void)
    {
            char buf[64];
            cell_t reg;
            phandle_t vty;
    
            if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
                    return (-1);
    
            if ((vty = OF_finddevice(buf)) == -1)
                    return (-1);
    
            if (OF_getprop(vty, "name", buf, sizeof(buf)) <= 0)
                    return (-1);
            if (strcmp(buf, "vty") != 0)
                    return (-1);
    
            if (OF_getprop(vty, "device_type", buf, sizeof(buf)) == -1)
                    return (-1);
            if (strcmp(buf, "serial") != 0)
                    return (-1);
    
            if (OF_getprop(vty, "compatible", buf, sizeof(buf)) <= 0)
                    return (-1);
            if (strcmp(buf, "hvterm1") != 0)
                    return (-1);
    
            reg = ~0U;
            OF_getencprop(vty, "reg", &reg, sizeof(reg));
            if (reg == ~0U)
                    return (-1);
    
            dbgport.vtermid = reg;
            dbgport.inbuflen = 0;
    
            return (0);
    }
    
    static void
    uart_phyp_dbg_init(void)
    {
    }
    
   static void
   uart_phyp_dbg_term(void)
   {
   }
   
   static int
   uart_phyp_dbg_getc(void)
   {
           int c, err, next;
   
           if (dbgport.inbuflen == 0) {
                   err = phyp_pft_hcall(H_GET_TERM_CHAR, dbgport.vtermid,
                       0, 0, 0, &dbgport.inbuflen, &dbgport.inbuf.u64[0],
                       &dbgport.inbuf.u64[1]);
                   if (err != H_SUCCESS)
                           return (-1);
           }
   
           if (dbgport.inbuflen == 0)
                   return (-1);
   
           c = dbgport.inbuf.str[0];
           dbgport.inbuflen--;
   
           if (dbgport.inbuflen == 0)
                   return (c);
   
           /*
            * Since version 2.11.0, QEMU became bug-compatible
            * with PowerVM's vty, by inserting a \0 after every \r.
            * Filter it here.
            */
           next = 1;
           if (c == '\r' && dbgport.inbuf.str[next] == '\0') {
                   next++;
                   dbgport.inbuflen--;
           }
   
           if (dbgport.inbuflen > 0)
                   memmove(&dbgport.inbuf.str[0], &dbgport.inbuf.str[next],
                       dbgport.inbuflen);
   
           return (c);
   }
   
   static void
   uart_phyp_dbg_putc(int c)
   {
           int     err;
   
           union {
                   uint64_t u64;
                   unsigned char bytes[8];
           } cbuf;
   
           cbuf.bytes[0] = (unsigned char)c;
   
           do {
                   err = phyp_hcall(H_PUT_TERM_CHAR, dbgport.vtermid, 1,
                       cbuf.u64, 0);
                   DELAY(100);
           } while (err == H_BUSY);
   }

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