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[mp] Define an API for multiprocessor functions

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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>
This commit is contained in:
Michael Brown
2024-03-13 15:08:10 +00:00
parent df2f23e333
commit 1ab4d3079d
11 changed files with 530 additions and 0 deletions
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67
src/core/mp.c Normal file
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/*
* Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* Multiprocessor functions
*
*/
#include <ipxe/timer.h>
#include <ipxe/mp.h>
/** Time to wait for application processors */
#define MP_MAX_CPUID_WAIT_MS 10
/**
* Get boot CPU identifier
*
* @ret id Boot CPU identifier
*/
unsigned int mp_boot_cpuid ( void ) {
unsigned int max = 0;
/* Update maximum to accommodate boot processor */
mp_exec_boot ( mp_update_max_cpuid, &max );
DBGC ( &mp_call, "MP boot processor ID is %#x\n", max );
return max;
}
/**
* Get maximum CPU identifier
*
* @ret max Maximum CPU identifier
*/
unsigned int mp_max_cpuid ( void ) {
unsigned int max = mp_boot_cpuid();
/* Update maximum to accommodate application processors */
mp_start_all ( mp_update_max_cpuid, &max );
mdelay ( MP_MAX_CPUID_WAIT_MS );
DBGC ( &mp_call, "MP observed maximum CPU ID is %#x\n", max );
return max;
}

37
src/core/null_mp.c Normal file
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/*
* Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/**
* @file
*
* Null multiprocessor API
*
*/
#include <ipxe/mp.h>
PROVIDE_MPAPI_INLINE ( null, mp_address );
PROVIDE_MPAPI_INLINE ( null, mp_exec_boot );
PROVIDE_MPAPI_INLINE ( null, mp_start_all );