blob: 0f99a436c5544755fca66c5b19c396184ed717a3 (
plain)
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
|
/*
* printk() for use before the final page tables are setup.
*
* Copyright (C) 2012 Citrix Systems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/stdarg.h>
#include <xen/string.h>
#include <asm/early_printk.h>
#ifdef EARLY_UART_ADDRESS
void __init early_putch(char c)
{
volatile uint32_t *r;
r = (uint32_t *)(XEN_VIRT_START + (1 << 21));
/* XXX: assuming a PL011 UART. */
while(*(r + 0x6) & 0x8)
;
*r = c;
}
/* Early printk buffer */
static char __initdata buf[512];
static void __init early_puts(const char *s)
{
while (*s != '\0') {
if (*s == '\n')
early_putch('\r');
early_putch(*s);
s++;
}
}
static void __init early_vprintk(const char *fmt, va_list args)
{
vsnprintf(buf, sizeof(buf), fmt, args);
early_puts(buf);
}
void __init early_printk(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
early_vprintk(fmt, args);
va_end(args);
}
void __attribute__((noreturn)) __init
early_panic(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
early_vprintk(fmt, args);
va_end(args);
while(1);
}
#endif /* #ifdef EARLY_UART_ADDRESS */
|
