33 lines
709 B
C
33 lines
709 B
C
/*
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* farcall.c
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*/
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#include <com32.h>
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static inline uint32_t eflags(void)
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{
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//uint32_t v;
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#if __SIZEOF_POINTER__ == 4
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uint32_t v;
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asm volatile("pushfl ; popl %0" : "=rm" (v));
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#elif __SIZEOF_POINTER__ == 8
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uint64_t v;
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asm volatile("pushfq ; pop %0" : "=rm" (v));
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#else
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#error "Unable to build for to-be-defined architecture type"
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#endif
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return v;
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}
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void __farcall(uint16_t cs, uint16_t ip,
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const com32sys_t * ireg, com32sys_t * oreg)
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{
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com32sys_t xreg = *ireg;
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/* Enable interrupts if and only if they are enabled in the caller */
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xreg.eflags.l = (xreg.eflags.l & ~EFLAGS_IF) | (eflags() & EFLAGS_IF);
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__com32.cs_farcall((cs << 16) + ip, &xreg, oreg);
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}
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