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
32 #include <dev/ofw/openfirm.h>
33 #include <gdb/gdb.h>
34
35 #include "phyp-hvcall.h"
36
37 static gdb_probe_f uart_phyp_dbg_probe;
38 static gdb_init_f uart_phyp_dbg_init;
39 static gdb_term_f uart_phyp_dbg_term;
40 static gdb_getc_f uart_phyp_dbg_getc;
41 static gdb_putc_f uart_phyp_dbg_putc;
42
43 GDB_DBGPORT(uart_phyp, uart_phyp_dbg_probe,
44 uart_phyp_dbg_init, uart_phyp_dbg_term,
45 uart_phyp_dbg_getc, uart_phyp_dbg_putc);
46
47 static struct uart_phyp_dbgport {
48 cell_t vtermid;
49 union {
50 uint64_t u64[2];
51 char str[16];
52 } inbuf;
53 uint64_t inbuflen;
54 } dbgport;
55
56 static int
57 uart_phyp_dbg_probe(void)
58 {
59 char buf[64];
60 cell_t reg;
61 phandle_t vty;
62
63 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
64 return (-1);
65
66 if ((vty = OF_finddevice(buf)) == -1)
67 return (-1);
68
69 if (OF_getprop(vty, "name", buf, sizeof(buf)) <= 0)
70 return (-1);
71 if (strcmp(buf, "vty") != 0)
72 return (-1);
73
74 if (OF_getprop(vty, "device_type", buf, sizeof(buf)) == -1)
75 return (-1);
76 if (strcmp(buf, "serial") != 0)
77 return (-1);
78
79 if (OF_getprop(vty, "compatible", buf, sizeof(buf)) <= 0)
80 return (-1);
81 if (strcmp(buf, "hvterm1") != 0)
82 return (-1);
83
84 reg = ~0U;
85 OF_getencprop(vty, "reg", ®, sizeof(reg));
86 if (reg == ~0U)
87 return (-1);
88
89 dbgport.vtermid = reg;
90 dbgport.inbuflen = 0;
91
92 return (0);
93 }
94
95 static void
96 uart_phyp_dbg_init(void)
97 {
98 }
99
100 static void
101 uart_phyp_dbg_term(void)
102 {
103 }
104
105 static int
106 uart_phyp_dbg_getc(void)
107 {
108 int c, err, next;
109
110 if (dbgport.inbuflen == 0) {
111 err = phyp_pft_hcall(H_GET_TERM_CHAR, dbgport.vtermid,
112 0, 0, 0, &dbgport.inbuflen, &dbgport.inbuf.u64[0],
113 &dbgport.inbuf.u64[1]);
114 if (err != H_SUCCESS)
115 return (-1);
116 }
117
118 if (dbgport.inbuflen == 0)
119 return (-1);
120
121 c = dbgport.inbuf.str[0];
122 dbgport.inbuflen--;
123
124 if (dbgport.inbuflen == 0)
125 return (c);
126
127 /*
128 * Since version 2.11.0, QEMU became bug-compatible
129 * with PowerVM's vty, by inserting a \0 after every \r.
130 * Filter it here.
131 */
132 next = 1;
133 if (c == '\r' && dbgport.inbuf.str[next] == '\0') {
134 next++;
135 dbgport.inbuflen--;
136 }
137
138 if (dbgport.inbuflen > 0)
139 memmove(&dbgport.inbuf.str[0], &dbgport.inbuf.str[next],
140 dbgport.inbuflen);
141
142 return (c);
143 }
144
145 static void
146 uart_phyp_dbg_putc(int c)
147 {
148 int err;
149
150 union {
151 uint64_t u64;
152 unsigned char bytes[8];
153 } cbuf;
154
155 cbuf.bytes[0] = (unsigned char)c;
156
157 do {
158 err = phyp_hcall(H_PUT_TERM_CHAR, dbgport.vtermid, 1,
159 cbuf.u64, 0);
160 DELAY(100);
161 } while (err == H_BUSY);
162 }
Cache object: 3d1b32b084b2e500ac7a749917438eea
|