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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2009 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2006-2007 Voltaire. All rights reserved.
* Copyright (c) 2009-2010 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2010-2018 Los Alamos National Security, LLC.
* All rights reserved.
* Copyright (c) 2020 Google, LLC. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/**
* @file
*/
#ifndef MCA_BTL_SM_VIRTUAL_H
#define MCA_BTL_SM_VIRTUAL_H
#include "opal_config.h"
#include "opal/mca/btl/sm/btl_sm_types.h"
#if SIZEOF_VOID_P == 8
# define MCA_BTL_SM_OFFSET_MASK 0xffffffffll
# define MCA_BTL_SM_OFFSET_BITS 32
# define MCA_BTL_SM_BITNESS 64
#else
# define MCA_BTL_SM_OFFSET_MASK 0x00ffffffl
# define MCA_BTL_SM_OFFSET_BITS 24
# define MCA_BTL_SM_BITNESS 32
#endif
/***
* One or more FIFO components may be a pointer that must be
* accessed by multiple processes. Since the shared region may
* be mmapped differently into each process's address space,
* these pointers will be relative to some base address. Here,
* we define inline functions to translate between relative
* addresses and virtual addresses.
*/
/* This only works for finding the relative address for a pointer within my_segment */
static inline fifo_value_t virtual2relative(char *addr)
{
return (fifo_value_t)((intptr_t)(addr - mca_btl_sm_component.my_segment))
| ((fifo_value_t) MCA_BTL_SM_LOCAL_RANK << MCA_BTL_SM_OFFSET_BITS);
}
static inline fifo_value_t virtual2relativepeer(struct mca_btl_base_endpoint_t *endpoint,
char *addr)
{
return (fifo_value_t)((intptr_t)(addr - endpoint->segment_base))
| ((fifo_value_t) endpoint->peer_smp_rank << MCA_BTL_SM_OFFSET_BITS);
}
static inline void *relative2virtual(fifo_value_t offset)
{
return (void *) (intptr_t)(
(offset & MCA_BTL_SM_OFFSET_MASK)
+ mca_btl_sm_component.endpoints[offset >> MCA_BTL_SM_OFFSET_BITS].segment_base);
}
#endif /* MCA_BTL_SM_VIRTUAL_H */
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