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author | Simon Rettberg | 2024-04-12 14:52:06 +0200 |
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committer | Simon Rettberg | 2024-04-12 14:52:06 +0200 |
commit | 2ae76865d3d109712f9ee488cbc19bd107bbc9ab (patch) | |
tree | 36e7310eb089cf7fd3496e5c32c70981e447f235 /src/core/mp.c | |
parent | Merge branch 'aqc1xx' into openslx (diff) | |
parent | [netdevice] Add "linktype" setting (diff) | |
download | ipxe-openslx.tar.gz ipxe-openslx.tar.xz ipxe-openslx.zip |
Merge branch 'master' into openslxopenslx
Diffstat (limited to 'src/core/mp.c')
-rw-r--r-- | src/core/mp.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/core/mp.c b/src/core/mp.c new file mode 100644 index 00000000..146d70a6 --- /dev/null +++ b/src/core/mp.c @@ -0,0 +1,67 @@ +/* + * 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; +} |