/**
@brief Calculate the saturation field value required for the requested
bandwidth and window size.
@param[in] uBandwidth - Bandwidth in bytes/sec
@param[in] uWindowSize - Window size in nanoseconds
@param[in] uQosFreq - The frequency of the Qos clock
@returns The appropriate saturation field value, will ceiling at max allowed
field size.
*/
static uint32_t noc_calc_sat_field
(
uint64_t uBandwidth,
uint32_t uWindowSize,
uint32_t uQosFreq
)
{
uint32_t uSatField = 0;
/* Shortcut if necessary. */
if( uBandwidth )
{
/* Limit to max bandwidth and scale the bandwidth down to 100KB increments.
* We run the risk of blowing out of 64-bits without it. */
uint64_t uBandwidthScaled = MIN(uBandwidth, MAX_BW(uQosFreq));
uBandwidthScaled = CEILING_DIV(uBandwidthScaled, 100000);
/* Calculate the saturation from the window size.
** Window size *can* be zero.
** Saturation must not exceed the maximum allowed field size.
** Note the additional scaling factor in the division, due to units:
** 10 for the bandwidth being in 100KB increments (instead of MB)
** 1000 for the window size being in ns (instead of us)
** 1000 for qos freq being in KHz (instead of MHz)
** Total: 10000000ULL
*/
uSatField = (uint32_t)MIN(CEILING_DIV(uBandwidthScaled * uWindowSize * uQosFreq, 10000000ULL * BW_SCALE * SAT_SCALE), MAX_SAT_FIELD);
}
return uSatField;
}
static uint64_t noc_calc_bw_ceil
(
uint32_t uBwField,
uint32_t uQosFreq
)
{
return CEILING_DIV(2ULL * uQosFreq * uBwField, 1000 * BW_SCALE) * 1000000ULL;
}
/**
@brief Calculate the bandwidth field value required for the requested
bandwidth.
@pre Expects uQosFreq to be non-zero.
@param[in] pBandwidth - The bandwidth structure
@param[in] uQosFreq - The frequency of the Qos clock
@returns The appropriate bandwidth field value, will ceiling at max allowed
field size.
*/
static uint32_t noc_calc_bw_field
(
uint64_t uBandwidth,
uint32_t uQosFreq
)
{
uint32_t uBwField = 0;
/* Shortcut if necessary. */
if( uBandwidth )
{
/* Calculate field, and cap to maximum. */
uint64_t uBandwidthCapped = MIN(uBandwidth, MAX_BW(uQosFreq));
uBwField = (uint32_t)MIN(CEILING_DIV(BW_SCALE * uBandwidthCapped, 2 * uQosFreq * 1000), MAX_BW_FIELD);
}
return uBwField;
}
void NegateBitArray(BitArrayRef set, int num_bits) {
int i;
for(i=0; i<CEILING_DIV(num_bits, BITS_PER_INT); i++) {
set[i] = ~set[i];
}
}
void CopyBitArray(BitArrayRef dest, BitArrayRef source, int num_bits) {
memmove(dest, source, CEILING_DIV(num_bits, CHAR_BIT));
}
void SetAllBitArray(BitArrayRef set, int num_bits) {
memset(set, UCHAR_MAX, CEILING_DIV(num_bits, CHAR_BIT));
}
void ZeroOutBitArray(BitArrayRef set, int num_bits) {
memset(set, 0, CEILING_DIV(num_bits, CHAR_BIT));
}
