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aedb8470bd
The license statements in our source files were getting to be a giant mess, and mostly they all just say the same thing. I've switched most of it to SPDX labels, but left copyright statements in place (where they were not obviously incorrect copy-paste jobs that I did...). If there's some change here you don't think is valid, let me know and we can fix it up together. Signed-off-by: Peter Jones <pjones@redhat.com>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
// SPDX-License-Identifier: BSD-2-Clause-Patent
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#ifndef SHIM_ASM_H_
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#define SHIM_ASM_H_
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#define __stringify_1(x...) #x
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#define __stringify(x...) __stringify_1(x)
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static inline uint64_t read_counter(void)
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{
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uint64_t val;
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#if defined (__x86_64__)
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unsigned long low, high;
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__asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high));
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val = (low) | (high) << 32;
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#elif defined(__i386__) || defined(__i686__)
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__asm__ __volatile__("rdtsc" : "=A" (val));
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#elif defined(__aarch64__)
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__asm__ __volatile__ ("mrs %0, pmccntr_el0" : "=r" (val));
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#elif defined(__arm__)
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__asm__ __volatile__ ("mrc p15, 0, %0, c9, c13, 0" : "=r" (val));
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#else
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#error unsupported arch
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#endif
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return val;
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}
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#if defined(__x86_64__) || defined(__i386__) || defined(__i686__)
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static inline void pause(void)
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{
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__asm__ __volatile__("pause");
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}
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#elif defined(__aarch64__)
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static inline void pause(void)
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{
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__asm__ __volatile__("wfi");
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}
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#else
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static inline void pause(void)
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{
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uint64_t a, b;
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int x;
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extern void msleep(unsigned long msecs);
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a = read_counter();
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for (x = 0; x < 1000; x++) {
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msleep(1000);
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b = read_counter();
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if (a != b)
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break;
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}
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}
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#endif
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#endif /* !SHIM_ASM_H_ */
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// vim:fenc=utf-8:tw=75:et
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