320 lines
8.1 KiB
C
320 lines
8.1 KiB
C
/***********************license start***************
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* Copyright (c) 2003-2010 Cavium Inc. (support@cavium.com). All rights
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* reserved.
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of Cavium Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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* This Software, including technical data, may be subject to U.S. export control
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* laws, including the U.S. Export Administration Act and its associated
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* regulations, and may be subject to export or import regulations in other
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* countries.
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
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* AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR
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* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
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* THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
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* DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
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* SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
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* MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
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* VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
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* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
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* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
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***********************license end**************************************/
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/**
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* @file
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*
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* Module to support operations on bitmap of cores. Coremask can be used to
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* select a specific core, a group of cores, or all available cores, for
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* initialization and differentiation of roles within a single shared binary
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* executable image.
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*
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* <hr>$Revision: 70030 $<hr>
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*
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*/
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#ifndef __CVMX_COREMASK_H__
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#define __CVMX_COREMASK_H__
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#include "cvmx-asm.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef uint64_t cvmx_coremask_holder_t; /* basic type to hold the
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coremask bits */
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#define CVMX_COREMASK_HLDRSZ ((int)(sizeof(cvmx_coremask_holder_t) * 8))
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/* bits per holder */
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#define CVMX_COREMASK_BMPSZ ((int)(CVMX_MAX_CORES / CVMX_COREMASK_HLDRSZ + 1))
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/* bit map size */
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/*
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* The macro pair implement a way to iterate active cores in the mask.
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* @param fec_pcm points to the coremask.
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* @param fec_ppid is the active core's id.
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*/
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#define CVMX_COREMASK_FOR_EACH_CORE_BEGIN(fec_pcm, fec_ppid) \
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do { \
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int fec_i, fec_j; \
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\
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for (fec_i = 0; fec_i < CVMX_COREMASK_BMPSZ; fec_i++) \
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{ \
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for (fec_j = 0; fec_j < CVMX_COREMASK_HLDRSZ; fec_j++) \
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{ \
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if (((cvmx_coremask_holder_t)1 << fec_j) & \
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(fec_pcm)->coremask_bitmap[fec_i]) \
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{ \
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fec_ppid = fec_i * CVMX_COREMASK_HLDRSZ + fec_j;
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#define CVMX_COREMASK_FOR_EACH_CORE_END \
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} \
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} \
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} \
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} while (0)
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struct cvmx_coremask {
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/*
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* Big-endian. Array elems of larger indices represent cores of
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* bigger ids. So do MSBs within a cvmx_coremask_holder_t. Ditto
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* MSbs within a byte.
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*/
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cvmx_coremask_holder_t coremask_bitmap[CVMX_COREMASK_BMPSZ];
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};
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/*
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* Is ``core'' set in the coremask?
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*
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* @param pcm is the pointer to the coremask.
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* @param core
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* @return 1 if core is set and 0 if not.
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*/
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static inline int cvmx_coremask_is_set_core(struct cvmx_coremask *pcm,
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int core)
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{
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int n, i;
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n = core % CVMX_COREMASK_HLDRSZ;
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i = core / CVMX_COREMASK_HLDRSZ;
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return (int)((pcm->coremask_bitmap[i] & (1ull << n)) != 0);
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}
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/*
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* Set ``core'' in the coremask.
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*
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* @param pcm is the pointer to the coremask.
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* @param core
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* @return 0.
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*/
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static inline int cvmx_coremask_set_core(struct cvmx_coremask *pcm,
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int core)
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{
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int n, i;
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n = core % CVMX_COREMASK_HLDRSZ;
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i = core / CVMX_COREMASK_HLDRSZ;
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pcm->coremask_bitmap[i] |= (1ull << n);
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return 0;
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}
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/*
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* Clear ``core'' from the coremask.
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*
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* @param pcm is the pointer to the coremask.
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* @param core
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* @return 0.
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*/
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static inline int cvmx_coremask_clear_core(struct cvmx_coremask *pcm,
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int core)
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{
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int n, i;
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n = core % CVMX_COREMASK_HLDRSZ;
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i = core / CVMX_COREMASK_HLDRSZ;
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pcm->coremask_bitmap[i] &= ~(1ull << n);
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return 0;
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}
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/*
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* Clear the coremask.
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*
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* @param pcm is the pointer to the coremask.
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* @return 0.
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*/
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static inline int cvmx_coremask_clear_all(struct cvmx_coremask *pcm)
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{
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int i;
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for (i = 0; i < CVMX_COREMASK_BMPSZ; i++)
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pcm->coremask_bitmap[i] = 0;
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return 0;
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}
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/*
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* Is the current core the first in the coremask?
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*
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* @param pcm is the pointer to the coremask.
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* @return 1 for yes and 0 for no.
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*/
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static inline int cvmx_coremask_first_core_bmp(struct cvmx_coremask *pcm)
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{
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int n, i;
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n = (int) cvmx_get_core_num();
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for (i = 0; i < CVMX_COREMASK_BMPSZ; i++)
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{
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if (pcm->coremask_bitmap[i])
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{
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if (n == 0 && pcm->coremask_bitmap[i] & 1)
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return 1;
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if (n >= CVMX_COREMASK_HLDRSZ)
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return 0;
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return ((((1ull << n) - 1) & pcm->coremask_bitmap[i]) == 0);
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}
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else
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n -= CVMX_COREMASK_HLDRSZ;
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}
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return 0;
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}
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/*
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* Is the current core a member of the coremask?
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*
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* @param pcm is the pointer to the coremask.
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* @return 1 for yes and 0 for no.
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*/
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static inline int cvmx_coremask_is_member_bmp(struct cvmx_coremask *pcm)
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{
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return cvmx_coremask_is_set_core(pcm, (int)cvmx_get_core_num());
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}
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/*
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* coremask is simply unsigned int (32 bits).
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*
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* NOTE: supports up to 32 cores maximum.
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*
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* union of coremasks is simply bitwise-or.
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* intersection of coremasks is simply bitwise-and.
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*
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*/
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#define CVMX_COREMASK_MAX 0xFFFFFFFFu /* maximum supported mask */
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/**
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* Compute coremask for a specific core.
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*
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* @param core_id The core ID
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*
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* @return coremask for a specific core
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*
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*/
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static inline unsigned int cvmx_coremask_core(unsigned int core_id)
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{
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return (1u << core_id);
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}
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/**
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* Compute coremask for num_cores cores starting with core 0.
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*
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* @param num_cores number of cores
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*
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* @return coremask for num_cores cores
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*
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*/
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static inline unsigned int cvmx_coremask_numcores(unsigned int num_cores)
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{
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return (CVMX_COREMASK_MAX >> (CVMX_MAX_CORES - num_cores));
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}
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/**
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* Compute coremask for a range of cores from core low to core high.
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*
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* @param low first core in the range
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* @param high last core in the range
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*
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* @return coremask for the range of cores
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*
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*/
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static inline unsigned int cvmx_coremask_range(unsigned int low, unsigned int high)
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{
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return ((CVMX_COREMASK_MAX >> (CVMX_MAX_CORES - 1 - high + low)) << low);
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}
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/**
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* Test to see if current core is a member of coremask.
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*
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* @param coremask the coremask to test against
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*
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* @return 1 if current core is a member of coremask, 0 otherwise
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*
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*/
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static inline int cvmx_coremask_is_member(unsigned int coremask)
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{
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return ((cvmx_coremask_core(cvmx_get_core_num()) & coremask) != 0);
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}
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/**
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* Test to see if current core is first core in coremask.
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*
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* @param coremask the coremask to test against
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*
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* @return 1 if current core is first core in the coremask, 0 otherwise
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*
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*/
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static inline int cvmx_coremask_first_core(unsigned int coremask)
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{
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return cvmx_coremask_is_member(coremask)
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&& ((cvmx_get_core_num() == 0) ||
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((cvmx_coremask_numcores(cvmx_get_core_num()) & coremask) == 0));
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}
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/**
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* Wait (stall) until all cores in the given coremask has reached this point
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* in the program execution before proceeding.
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*
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* @param coremask the group of cores performing the barrier sync
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*
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*/
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extern void cvmx_coremask_barrier_sync(unsigned int coremask);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __CVMX_COREMASK_H__ */
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