mirror of
https://github.com/ipxe/ipxe
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1ab4d3079d
Define an API for executing very limited functions on application processors in a multiprocessor system, along with an x86-only implementation. The normal iPXE runtime environment is effectively non-existent on application processors. There is no ability to make firmware calls (e.g. to write to a console), and there may be no stack space available. Signed-off-by: Michael Brown <mcb30@ipxe.org>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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* Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** @file
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*
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* Multiprocessor functions
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*
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*/
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#include <ipxe/timer.h>
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#include <ipxe/mp.h>
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/** Time to wait for application processors */
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#define MP_MAX_CPUID_WAIT_MS 10
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/**
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* Get boot CPU identifier
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*
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* @ret id Boot CPU identifier
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*/
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unsigned int mp_boot_cpuid ( void ) {
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unsigned int max = 0;
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/* Update maximum to accommodate boot processor */
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mp_exec_boot ( mp_update_max_cpuid, &max );
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DBGC ( &mp_call, "MP boot processor ID is %#x\n", max );
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return max;
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}
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/**
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* Get maximum CPU identifier
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*
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* @ret max Maximum CPU identifier
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*/
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unsigned int mp_max_cpuid ( void ) {
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unsigned int max = mp_boot_cpuid();
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/* Update maximum to accommodate application processors */
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mp_start_all ( mp_update_max_cpuid, &max );
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mdelay ( MP_MAX_CPUID_WAIT_MS );
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DBGC ( &mp_call, "MP observed maximum CPU ID is %#x\n", max );
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return max;
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}
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