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2130a790ca
Add a simple infrastructure for setting, resetting and querying platform feature flags. Flags can be either global or architecture specific. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Juergen Gross <jgross@suse.com>
28 lines
654 B
C
28 lines
654 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bitops.h>
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#include <linux/cache.h>
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#include <linux/export.h>
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#include <linux/platform-feature.h>
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#define PLATFORM_FEAT_ARRAY_SZ BITS_TO_LONGS(PLATFORM_FEAT_N)
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static unsigned long __read_mostly platform_features[PLATFORM_FEAT_ARRAY_SZ];
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void platform_set(unsigned int feature)
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{
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set_bit(feature, platform_features);
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}
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EXPORT_SYMBOL_GPL(platform_set);
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void platform_clear(unsigned int feature)
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{
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clear_bit(feature, platform_features);
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}
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EXPORT_SYMBOL_GPL(platform_clear);
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bool platform_has(unsigned int feature)
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{
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return test_bit(feature, platform_features);
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}
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EXPORT_SYMBOL_GPL(platform_has);
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