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It is useful to be able to keep track of the available CPUs in a multi-CPU system. This uclass is mostly intended for use with SMP systems. The uclass provides methods for getting basic information about each CPU. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __CPU_H
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#define __CPU_H
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/**
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* struct cpu_platdata - platform data for a CPU
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*
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* This can be accessed with dev_get_parent_platdata() for any UCLASS_CPU
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* device.
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*
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* @cpu_id: Platform-specific way of identifying the CPU.
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*/
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struct cpu_platdata {
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int cpu_id;
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};
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/* CPU features - mostly just a placeholder for now */
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enum {
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CPU_FEAT_L1_CACHE = 0, /* Supports level 1 cache */
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CPU_FEAT_MMU = 1, /* Supports virtual memory */
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CPU_FEAT_COUNT,
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};
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/**
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* struct cpu_info - Information about a CPU
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*
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* @cpu_freq: Current CPU frequency in Hz
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* @features: Flags for supported CPU features
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*/
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struct cpu_info {
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ulong cpu_freq;
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ulong features;
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};
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struct cpu_ops {
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/**
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* get_desc() - Get a description string for a CPU
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*
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* @dev: Device to check (UCLASS_CPU)
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* @buf: Buffer to place string
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* @size: Size of string space
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* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
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*/
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int (*get_desc)(struct udevice *dev, char *buf, int size);
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/**
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* get_info() - Get information about a CPU
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*
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* @dev: Device to check (UCLASS_CPU)
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* @info: Returns CPU info
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* @return 0 if OK, -ve on error
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*/
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int (*get_info)(struct udevice *dev, struct cpu_info *info);
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};
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#define cpu_get_ops(dev) ((struct cpu_ops *)(dev)->driver->ops)
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/**
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* cpu_get_desc() - Get a description string for a CPU
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*
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* @dev: Device to check (UCLASS_CPU)
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* @buf: Buffer to place string
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* @size: Size of string space
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* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
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*/
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int cpu_get_desc(struct udevice *dev, char *buf, int size);
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/**
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* cpu_get_info() - Get information about a CPU
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*
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* @dev: Device to check (UCLASS_CPU)
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* @info: Returns CPU info
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* @return 0 if OK, -ve on error
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*/
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int cpu_get_info(struct udevice *dev, struct cpu_info *info);
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#endif
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