110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
/*
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* Copyright (c) 2017-2018 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <netinet/in_stat.h>
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#define IN_STAT_ACTIVITY_GRANULARITY 8 /* 8 sec granularity */
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#define IN_STAT_ACTIVITY_TIME_SEC_SHIFT 3 /* 8 sec per bit */
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#define IN_STAT_ACTIVITY_BITMAP_TOTAL_SIZE ((uint64_t) 128)
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#define IN_STAT_ACTIVITY_BITMAP_FIELD_SIZE ((uint64_t) 64)
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#define IN_STAT_ACTIVITY_TOTAL_TIME ((uint64_t) (8 * 128))
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#define IN_STAT_SET_MOST_SIGNIFICANT_BIT ((u_int64_t )0x8000000000000000)
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void
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in_stat_set_activity_bitmap(activity_bitmap_t *activity, uint64_t now)
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{
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uint64_t elapsed_time, slot;
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uint64_t *bitmap;
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if (activity->start == 0) {
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// Align all activity maps
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activity->start = now - (now % IN_STAT_ACTIVITY_GRANULARITY);
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}
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elapsed_time = now - activity->start;
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slot = elapsed_time >> IN_STAT_ACTIVITY_TIME_SEC_SHIFT;
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if (slot < IN_STAT_ACTIVITY_BITMAP_TOTAL_SIZE) {
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if (slot < IN_STAT_ACTIVITY_BITMAP_FIELD_SIZE) {
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bitmap = &activity->bitmap[0];
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} else {
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bitmap = &activity->bitmap[1];
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slot -= IN_STAT_ACTIVITY_BITMAP_FIELD_SIZE;
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}
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*bitmap |= (((u_int64_t) 1) << slot);
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} else {
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if (slot >= (IN_STAT_ACTIVITY_BITMAP_TOTAL_SIZE * 2)) {
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activity->start = now - IN_STAT_ACTIVITY_TOTAL_TIME;
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activity->bitmap[0] = activity->bitmap[1] = 0;
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} else {
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uint64_t shift =
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slot - (IN_STAT_ACTIVITY_BITMAP_TOTAL_SIZE - 1);
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/*
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* Move the start time and bitmap forward to
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* cover the lost time
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*/
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activity->start +=
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(shift << IN_STAT_ACTIVITY_TIME_SEC_SHIFT);
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if (shift > IN_STAT_ACTIVITY_BITMAP_FIELD_SIZE) {
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activity->bitmap[0] = activity->bitmap[1];
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activity->bitmap[1] = 0;
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shift -= IN_STAT_ACTIVITY_BITMAP_FIELD_SIZE;
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if (shift == IN_STAT_ACTIVITY_BITMAP_FIELD_SIZE) {
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activity->bitmap[0] = 0;
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} else {
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activity->bitmap[0] >>= shift;
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}
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} else {
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uint64_t mask_lower, tmp;
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uint64_t b1_low, b0_high;
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/*
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* generate a mask with all of lower
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* 'shift' bits set
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*/
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tmp = (((uint64_t)1) << (shift - 1));
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mask_lower = ((tmp - 1) ^ tmp);
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activity->bitmap[0] >>= shift;
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b1_low = (activity->bitmap[1] & mask_lower);
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b0_high = (b1_low <<
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(IN_STAT_ACTIVITY_BITMAP_FIELD_SIZE -
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shift));
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activity->bitmap[0] |= b0_high;
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activity->bitmap[1] >>= shift;
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}
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}
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activity->bitmap[1] |= IN_STAT_SET_MOST_SIGNIFICANT_BIT;
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}
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}
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void
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in_stat_clear_activity_bitmap(activity_bitmap_t *activity)
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{
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activity->start = 0;
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activity->bitmap[0] = 0;
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activity->bitmap[1] = 0;
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}
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