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Lorenzo Pieralisi
a0ae024050
When booting through a device tree, the kernel cpu logical id map can be initialized using device tree data passed by FW or through an embedded blob. This patch adds a function that parses device tree "cpu" nodes and retrieves the corresponding CPUs hardware identifiers (MPIDR). It sets the possible cpus and the cpu logical map values according to the number of CPUs defined in the device tree and respective properties. The device tree HW identifiers are considered valid if all CPU nodes contain a "reg" property, there are no duplicate "reg" entries and the DT defines a CPU node whose "reg" property matches the MPIDR[23:0] of the boot CPU. The primary CPU is assigned cpu logical number 0 to keep the current convention valid. Current bindings documentation is included in the patch: Documentation/devicetree/bindings/arm/cpus.txt Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org>
32 lines
799 B
C
32 lines
799 B
C
/*
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* arch/arm/include/asm/prom.h
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*
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* Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __ASMARM_PROM_H
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#define __ASMARM_PROM_H
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#ifdef CONFIG_OF
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extern struct machine_desc *setup_machine_fdt(unsigned int dt_phys);
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extern void arm_dt_memblock_reserve(void);
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extern void __init arm_dt_init_cpu_maps(void);
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#else /* CONFIG_OF */
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static inline struct machine_desc *setup_machine_fdt(unsigned int dt_phys)
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{
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return NULL;
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}
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static inline void arm_dt_memblock_reserve(void) { }
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static inline void arm_dt_init_cpu_maps(void) { }
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#endif /* CONFIG_OF */
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#endif /* ASMARM_PROM_H */
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