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/**
* @file
*
* @ingroup powerpc_shared
*
* @brief Header file for tic-tac code.
*/
/*
* Copyright (c) 2008
* Embedded Brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* rtems@embedded-brains.de
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/**
* @brief Reset reference ticks for tac().
*/
static inline void tic(void)
{
uint32_t tmp;
asm volatile (
"mftb 0;"
"stw 0, ppc_tic_tac@sdarel(13);"
: "=r" (tmp)
);
}
/**
* @brief Returns number of ticks since last tic().
*/
static inline uint32_t tac(void)
{
uint32_t ticks;
uint32_t tmp;
asm volatile (
"mftb %0;"
"lwz %1, ppc_tic_tac@sdarel(13);"
"subf %0, %1, %0;"
: "=r" (ticks), "=r" (tmp)
);
return ticks;
}
/**
* @brief Reset reference ticks for bam().
*/
static inline void boom(void)
{
uint32_t tmp;
asm volatile (
"mftb 0;"
"stw 0, ppc_boom_bam@sdarel(13);"
: "=r" (tmp)
);
}
/**
* @brief Returns number of ticks since last boom().
*/
static inline uint32_t bam(void)
{
uint32_t ticks;
uint32_t tmp;
asm volatile (
"mftb %0;"
"lwz %1, ppc_boom_bam@sdarel(13);"
"subf %0, %1, %0;"
: "=r" (ticks), "=r" (tmp)
);
return ticks;
}
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