1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
|
// Raw screen writing and debug output code.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include <stdarg.h> // va_list
#include "farptr.h" // GET_VAR
#include "util.h" // printf
#include "bregs.h" // struct bregs
#include "config.h" // CONFIG_*
#include "biosvar.h" // GET_GLOBAL
#define DEBUG_PORT 0x03f8
#define DEBUG_TIMEOUT 100000
void
debug_serial_setup()
{
if (!CONFIG_DEBUG_SERIAL)
return;
// setup for serial logging: 8N1
u8 oldparam, newparam = 0x03;
oldparam = inb(DEBUG_PORT+3);
outb(newparam, DEBUG_PORT+3);
// Disable irqs
u8 oldier, newier = 0;
oldier = inb(DEBUG_PORT+1);
outb(newier, DEBUG_PORT+1);
if (oldparam != newparam || oldier != newier)
dprintf(1, "Changing serial settings was %x/%x now %x/%x\n"
, oldparam, oldier, newparam, newier);
}
// Write a character to the serial port.
static void
debug_serial(char c)
{
int timeout = DEBUG_TIMEOUT;
while ((inb(DEBUG_PORT+5) & 0x60) != 0x60)
if (!timeout--)
// Ran out of time.
return;
outb(c, DEBUG_PORT);
}
// Show a character on the screen.
static void
screenc(u8 c)
{
if (MODE16)
// printf is only used in 32bit code.
return;
struct bregs br;
memset(&br, 0, sizeof(br));
br.ah = 0x0e;
br.al = c;
call16_int(0x10, &br);
}
// Output a character.
static void
putc(u16 action, char c)
{
if (CONFIG_DEBUG_LEVEL) {
if (! CONFIG_COREBOOT)
// Send character to debug port.
outb(c, PORT_BIOS_DEBUG);
if (CONFIG_DEBUG_SERIAL) {
// Send character to serial port.
if (c == '\n')
debug_serial('\r');
debug_serial(c);
}
}
if (action) {
// Send character to video screen.
if (c == '\n')
screenc('\r');
screenc(c);
}
}
// Ouptut a string.
static void
puts(u16 action, const char *s)
{
for (; *s; s++)
putc(action, *s);
}
// Output a string that is in the CS segment.
static void
puts_cs(u16 action, const char *s)
{
for (;; s++) {
char c = GET_GLOBAL(*(u8*)s);
if (!c)
break;
putc(action, c);
}
}
// Output an unsigned integer.
static void
putuint(u16 action, u32 val)
{
char buf[12];
char *d = &buf[sizeof(buf) - 1];
*d-- = '\0';
for (;;) {
*d = (val % 10) + '0';
val /= 10;
if (!val)
break;
d--;
}
puts(action, d);
}
// Output a single digit hex character.
static inline void
putsinglehex(u16 action, u32 val)
{
if (val <= 9)
val = '0' + val;
else
val = 'a' + val - 10;
putc(action, val);
}
// Output an integer in hexadecimal.
static void
puthex(u16 action, u32 val)
{
putsinglehex(action, (val >> 28) & 0xf);
putsinglehex(action, (val >> 24) & 0xf);
putsinglehex(action, (val >> 20) & 0xf);
putsinglehex(action, (val >> 16) & 0xf);
putsinglehex(action, (val >> 12) & 0xf);
putsinglehex(action, (val >> 8) & 0xf);
putsinglehex(action, (val >> 4) & 0xf);
putsinglehex(action, (val >> 0) & 0xf);
}
static inline int
isdigit(u8 c)
{
return ((u8)(c - '0')) < 10;
}
static void
bvprintf(u16 action, const char *fmt, va_list args)
{
const char *s = fmt;
for (;; s++) {
char c = GET_GLOBAL(*(u8*)s);
if (!c)
break;
if (c != '%') {
putc(action, c);
continue;
}
const char *n = s+1;
for (;;) {
c = GET_GLOBAL(*(u8*)n);
if (!isdigit(c))
break;
n++;
}
if (c == 'l') {
// Ignore long format indicator
n++;
c = GET_GLOBAL(*(u8*)n);
}
s32 val;
const char *sarg;
switch (c) {
case '%':
putc(action, '%');
break;
case 'd':
val = va_arg(args, s32);
if (val < 0) {
putc(action, '-');
val = -val;
}
putuint(action, val);
break;
case 'u':
val = va_arg(args, s32);
putuint(action, val);
break;
case 'p':
case 'x':
val = va_arg(args, s32);
puthex(action, val);
break;
case 'c':
val = va_arg(args, int);
putc(action, val);
break;
case '.':
// Hack to support "%.s" - meaning string on stack.
if (GET_GLOBAL(*(u8*)(n+1)) != 's')
break;
n++;
sarg = va_arg(args, const char *);
puts(action, sarg);
break;
case 's':
sarg = va_arg(args, const char *);
puts_cs(action, sarg);
break;
default:
putc(action, '%');
n = s;
}
s = n;
}
}
void
panic(const char *fmt, ...)
{
if (CONFIG_DEBUG_LEVEL) {
va_list args;
va_start(args, fmt);
bvprintf(0, fmt, args);
va_end(args);
}
// XXX - use PANIC PORT.
irq_disable();
for (;;)
hlt();
}
void
__dprintf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
bvprintf(0, fmt, args);
va_end(args);
}
void
printf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
bvprintf(1, fmt, args);
va_end(args);
}
static void
dump_regs(struct bregs *regs)
{
if (!regs) {
dprintf(1, " NULL\n");
return;
}
dprintf(1, " a=%x b=%x c=%x d=%x si=%x di=%x\n"
, regs->eax, regs->ebx, regs->ecx, regs->edx
, regs->esi, regs->edi);
dprintf(1, " ds=%x es=%x ip=%x cs=%x f=%x r=%p\n"
, regs->ds, regs->es, regs->ip, regs->cs, regs->flags, regs);
}
// Report entry to an Interrupt Service Routine (ISR).
void
__debug_isr(const char *fname)
{
puts_cs(0, fname);
putc(0, '\n');
}
// Function called on handler startup.
void
__debug_enter(struct bregs *regs, const char *fname)
{
dprintf(1, "enter %s:\n", fname);
dump_regs(regs);
}
// Send debugging output info.
void
__debug_stub(struct bregs *regs, int lineno, const char *fname)
{
dprintf(1, "stub %s:%d:\n", fname, lineno);
dump_regs(regs);
}
// Report on a handler returning a failure notification to the caller.
void
__set_fail(struct bregs *regs, int lineno, const char *fname)
{
dprintf(1, "fail %s:%d:\n", fname, lineno);
dump_regs(regs);
set_fail_silent(regs);
}
// Report on a handler returning a failure code to the caller. Note,
// the lineno and return code are encoded in the same parameter as gcc
// does a better job of scheduling function calls when there are 3 or
// less parameters.
void
__set_code_fail(struct bregs *regs, u32 linecode, const char *fname)
{
u8 code = linecode;
u32 lineno = linecode >> 8;
dprintf(1, "fail %s:%d(%x):\n", fname, lineno, code);
dump_regs(regs);
set_code_fail_silent(regs, code);
}
|