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https://git.proxmox.com/git/efi-boot-shim
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60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
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* asm.h
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* Copyright 2018 Peter Jones <pjones@redhat.com>
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*/
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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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