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hw: ease usage of the kernel log

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ref #989
This commit is contained in:
Martin Stein
2014-01-20 18:24:57 +01:00
committed by Norman Feske
parent eeb2d95b1f
commit 901b3e2bb4
5 changed files with 39 additions and 30 deletions
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59
base-hw/include/kernel/log.h
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@ -1,5 +1,5 @@
/*
* \brief Print to kernel log output
* \brief Print to the standard output of the kernel
* \author Martin stein
* \date 2012-04-05
*/
@ -17,42 +17,45 @@
/* Genode includes */
#include <kernel/interface.h>
namespace Genode
namespace Kernel
{
/**
* Prints incoming streams to the kernel log output
* Prints incoming streams to the standard output of the kernel
*/
class Kernel_log
class Log
{
/**
* Print an unsigned 4 bit integer as hexadecimal value
*/
void _print_4bit_hex(unsigned char x) const
{
/* decode to ASCII char */
x &= 0x0f;
if (x > 9) x += 39;
x += 48;
private:
/* print ASCII char */
Kernel::print_char(x);
}
/**
* 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 zero-terminated string
* Print a zero-terminated string s
*/
Kernel_log & operator << (char const * s)
Log & operator << (char const * s)
{
while (*s) Kernel::print_char(*s++);
while (*s) print_char(*s++);
if (*--s != '\n') { print_char(' '); }
return *this;
}
/**
* Print an unsigned integer as hexadecimal value
* Print an unsigned integer x as hexadecimal value
*/
Kernel_log & operator << (unsigned int const & x)
Log & operator << (unsigned int const x)
{
enum {
BYTE_WIDTH = 8,
@ -91,17 +94,23 @@ namespace Genode
_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; }
};
/**
* Give static 'Kernel_log' reference as target for common log output
* Return singleton kernel-log
*/
inline Kernel_log & kernel_log()
inline Log & log()
{
static Kernel_log _log;
return _log;
static Log s;
return s;
}
}