mtk-lk/platform/common/aee_platform_debug/utils.h

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*
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#ifndef __AEE_PLATFORM_DEBUG_UTILS_H__
#define __AEE_PLATFORM_DEBUG_UTILS_H__

static inline unsigned int extract_n2mbits(unsigned int input, unsigned int n, unsigned int m)
{
	/*
	 * 1. ~0 = 1111 1111 1111 1111 1111 1111 1111 1111
	 * 2. ~0 << (m - n + 1) = 1111 1111 1111 1111 1100 0000 0000 0000
	 * // assuming we are extracting 14 bits, the +1 is added for inclusive selection
	 * 3. ~(~0 << (m - n + 1)) = 0000 0000 0000 0000 0011 1111 1111 1111
	 */
	int mask;

	if (n > m) {
		n = n + m;
		m = n - m;
		n = n - m;
	}
	mask = ~(~0U << (m - n + 1));
	return (input >> n) & mask;
}

#endif /* __AEE_PLATFORM_DEBUG_UTILS_H__ */