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
|
/*
* Copyright (c) 2009 Corey Tabaka
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdarg.h>
#include <reg.h>
#include <stdio.h>
#include <kernel/thread.h>
#include <arch/x86.h>
#include <lib/cbuf.h>
#include <platform/interrupts.h>
#include <platform/pc/memmap.h>
#include <platform/console.h>
#include <platform/keyboard.h>
#include <platform/debug.h>
static const int uart_baud_rate = 115200;
static const int uart_io_port = 0x3f8;
cbuf_t console_input_buf;
static enum handler_return uart_irq_handler(void *arg)
{
unsigned char c;
bool resched = false;
while (inp(uart_io_port + 5) & (1<<0)) {
c = inp(uart_io_port + 0);
cbuf_write_char(&console_input_buf, c, false);
resched = true;
}
return resched ? INT_RESCHEDULE : INT_NO_RESCHEDULE;
}
void platform_init_debug_early(void)
{
/* configure the uart */
int divisor = 115200 / uart_baud_rate;
/* get basic config done so that tx functions */
outp(uart_io_port + 3, 0x80); // set up to load divisor latch
outp(uart_io_port + 0, divisor & 0xff); // lsb
outp(uart_io_port + 1, divisor >> 8); // msb
outp(uart_io_port + 3, 3); // 8N1
outp(uart_io_port + 2, 0x07); // enable FIFO, clear, 14-byte threshold
}
void platform_init_debug(void)
{
/* finish uart init to get rx going */
cbuf_initialize(&console_input_buf, 1024);
register_int_handler(0x24, uart_irq_handler, NULL);
unmask_interrupt(0x24);
outp(uart_io_port + 1, 0x1); // enable receive data available interrupt
}
static void debug_uart_putc(char c)
{
while ((inp(uart_io_port + 5) & (1<<6)) == 0)
;
outp(uart_io_port + 0, c);
}
void platform_dputc(char c)
{
if (c == '\n')
platform_dputc('\r');
cputc(c);
debug_uart_putc(c);
}
int platform_dgetc(char *c, bool wait)
{
return cbuf_read_char(&console_input_buf, c, wait);
}
void platform_halt(void)
{
for (;;) {
x86_cli();
x86_hlt();
}
}
|
