hyperv.h

Go to the documentation of this file.

#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;
        uint32_t in_phys;
        uint32_t out_phys;
        uint32_t discard_ecx;
        uint32_t discard_edx;
        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 ) );
        __asm__ __volatile__ ( "call *%9"
                               : "=a" ( result ), "=c" ( discard_ecx ),
                                 "=d" ( discard_edx )
                               : "d" ( 0 ), "a" ( code ),
                                 "b" ( 0 ), "c" ( in_phys ),
                                 "D" ( 0 ), "S" ( out_phys ),
                                 "m" ( hypercall ) );
        return result;
}

#endif /* _BITS_HYPERV_H */