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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;
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;
}
/**
* Set bit atomically
*
* @v bits Bit field
* @v bit Bit to set
*/
static inline __attribute__ (( always_inline )) void
hv_set_bit ( void *bits, unsigned int bit ) {
struct {
uint32_t dword[ ( bit / 32 ) + 1 ];
} *dwords = bits;
/* Set bit using "lock bts". Inform compiler that any memory
* from the start of the bit field up to and including the
* dword containing this bit may be modified. (This is
* overkill but shouldn't matter in practice since we're
* unlikely to subsequently read other bits from the same bit
* field.)
*/
__asm__ __volatile__ ( "lock bts %1, %0"
: "+m" ( *dwords ) : "Ir" ( bit ) );
}
#endif /* _BITS_HYPERV_H */
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