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#ifndef _BITS_HYPERV_H
#define _BITS_HYPERV_H
/** @file
*
* Hyper-V interface
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stddef.h>
#include <stdint.h>
#include <ipxe/io.h>
/**
* Issue hypercall
*
* @v hv Hyper-V hypervisor
* @v code Call code
* @v in Input parameters
* @v out Output parameters
* @ret status Status code
*/
static inline __attribute__ (( always_inline )) int
hv_call ( struct hv_hypervisor *hv, unsigned int code, const void *in,
void *out ) {
void *hypercall = hv->hypercall;
register uint64_t rcx asm ( "rcx" );
register uint64_t rdx asm ( "rdx" );
register uint64_t r8 asm ( "r8" );
uint64_t in_phys;
uint64_t out_phys;
uint16_t result;
in_phys = ( ( __builtin_constant_p ( in ) && ( in == NULL ) )
? 0 : virt_to_phys ( in ) );
out_phys = ( ( __builtin_constant_p ( out ) && ( out == NULL ) )
? 0 : virt_to_phys ( out ) );
rcx = code;
rdx = in_phys;
r8 = out_phys;
__asm__ __volatile__ ( "call *%4"
: "=a" ( result ), "+r" ( rcx ), "+r" ( rdx ),
"+r" ( r8 )
: "m" ( hypercall )
: "r9", "r10", "r11" );
return result;
}
#endif /* _BITS_HYPERV_H */
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