mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-26 17:01:07 +00:00
ca971bbfd8
This patch changes the top-level directory layout as a preparatory step for improving the tools for managing 3rd-party source codes. The rationale is described in the issue referenced below. Issue #1082
119 lines
2.3 KiB
C++
119 lines
2.3 KiB
C++
/*
|
|
* \brief Print to the standard output of the kernel
|
|
* \author Martin stein
|
|
* \date 2012-04-05
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2012-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _KERNEL__LOG_H_
|
|
#define _KERNEL__LOG_H_
|
|
|
|
/* Genode includes */
|
|
#include <kernel/interface.h>
|
|
|
|
namespace Kernel
|
|
{
|
|
/**
|
|
* Prints incoming streams to the standard output of the kernel
|
|
*/
|
|
class Log
|
|
{
|
|
private:
|
|
|
|
/**
|
|
* Print an unsigned 4 bit integer x as hexadecimal value
|
|
*/
|
|
void _print_4bit_hex(unsigned char x) const
|
|
{
|
|
/* decode to ASCII char */
|
|
x &= 0x0f;
|
|
if (x > 9) x += 39;
|
|
x += 48;
|
|
|
|
/* print ASCII char */
|
|
print_char(x);
|
|
}
|
|
|
|
public:
|
|
|
|
/**
|
|
* Print a zero-terminated string s
|
|
*/
|
|
Log & operator << (char const * s)
|
|
{
|
|
while (*s) print_char(*s++);
|
|
if (*--s != '\n') { print_char(' '); }
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* Print an unsigned integer x as hexadecimal value
|
|
*/
|
|
Log & operator << (unsigned int const x)
|
|
{
|
|
enum {
|
|
BYTE_WIDTH = 8,
|
|
CW = sizeof(unsigned char)*BYTE_WIDTH,
|
|
IW = sizeof(unsigned int)*BYTE_WIDTH
|
|
};
|
|
|
|
/*
|
|
* Walk from most significant to least significant bit and
|
|
* process 2 hex digits per step.
|
|
*/
|
|
bool leading = true;
|
|
for (int i = IW - CW; i >= 0; i = i - CW)
|
|
{
|
|
/* fetch the 2 current digits */
|
|
unsigned char c = (char)((x >> i) & 0xff);
|
|
|
|
/* has the payload part of the value already begun? */
|
|
if (leading)
|
|
{
|
|
/* ignore leading zeros ... */
|
|
if (!c)
|
|
{
|
|
/* ... expect they are the only digits */
|
|
if (i == 0) _print_4bit_hex(c);
|
|
continue;
|
|
}
|
|
/* transit from leading to payload part */
|
|
leading = false;
|
|
if (c < 0x10) {
|
|
_print_4bit_hex(c);
|
|
continue;
|
|
}
|
|
}
|
|
/* print both digits */
|
|
_print_4bit_hex(c >> 4);
|
|
_print_4bit_hex(c);
|
|
}
|
|
print_char(' ');
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* Print a pointer p as hexadecimal value
|
|
*/
|
|
Log & operator << (void * const p) { return *this << (unsigned)p; }
|
|
};
|
|
|
|
/**
|
|
* Return singleton kernel-log
|
|
*/
|
|
inline Log & log()
|
|
{
|
|
static Log s;
|
|
return s;
|
|
}
|
|
}
|
|
|
|
#endif /* _KERNEL__LOG_H_ */
|
|
|