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#ifndef _BITS_XEN_H
#define _BITS_XEN_H
/** @file
*
* Xen interface
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/* Hypercall registers */
#ifdef __x86_64__
#define XEN_REG1 "rdi"
#define XEN_REG2 "rsi"
#define XEN_REG3 "rdx"
#define XEN_REG4 "r10"
#define XEN_REG5 "r8"
#else
#define XEN_REG1 "ebx"
#define XEN_REG2 "ecx"
#define XEN_REG3 "edx"
#define XEN_REG4 "esi"
#define XEN_REG5 "edi"
#endif
/** A hypercall entry point */
struct xen_hypercall {
/** Code generated by hypervisor */
uint8_t code[32];
} __attribute__ (( packed ));
/**
* Issue hypercall with one argument
*
* @v xen Xen hypervisor
* @v hypercall Hypercall number
* @v arg1 First argument
* @ret retval Return value
*/
static inline __attribute__ (( always_inline )) unsigned long
xen_hypercall_1 ( struct xen_hypervisor *xen, unsigned int hypercall,
unsigned long arg1 ) {
register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
unsigned long retval;
__asm__ __volatile__ ( "call *%2"
: "=a" ( retval ), "+r" ( reg1 )
: "r" ( &xen->hypercall[hypercall] )
: XEN_REG2, XEN_REG3, XEN_REG4, XEN_REG5,
"memory" );
return retval;
}
/**
* Issue hypercall with two arguments
*
* @v xen Xen hypervisor
* @v hypercall Hypercall number
* @v arg1 First argument
* @v arg2 Second argument
* @ret retval Return value
*/
static inline __attribute__ (( always_inline )) unsigned long
xen_hypercall_2 ( struct xen_hypervisor *xen, unsigned int hypercall,
unsigned long arg1, unsigned long arg2 ) {
register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
unsigned long retval;
__asm__ __volatile__ ( "call *%3"
: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 )
: "r" ( &xen->hypercall[hypercall] )
: XEN_REG3, XEN_REG4, XEN_REG5, "memory" );
return retval;
}
/**
* Issue hypercall with three arguments
*
* @v xen Xen hypervisor
* @v hypercall Hypercall number
* @v arg1 First argument
* @v arg2 Second argument
* @v arg3 Third argument
* @ret retval Return value
*/
static inline __attribute__ (( always_inline )) unsigned long
xen_hypercall_3 ( struct xen_hypervisor *xen, unsigned int hypercall,
unsigned long arg1, unsigned long arg2, unsigned long arg3 ) {
register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
register unsigned long reg3 asm ( XEN_REG3 ) = arg3;
unsigned long retval;
__asm__ __volatile__ ( "call *%4"
: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 ),
"+r" ( reg3 )
: "r" ( &xen->hypercall[hypercall] )
: XEN_REG4, XEN_REG5, "memory" );
return retval;
}
/**
* Issue hypercall with four arguments
*
* @v xen Xen hypervisor
* @v hypercall Hypercall number
* @v arg1 First argument
* @v arg2 Second argument
* @v arg3 Third argument
* @v arg4 Fourth argument
* @ret retval Return value
*/
static inline __attribute__ (( always_inline )) unsigned long
xen_hypercall_4 ( struct xen_hypervisor *xen, unsigned int hypercall,
unsigned long arg1, unsigned long arg2, unsigned long arg3,
unsigned long arg4 ) {
register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
register unsigned long reg3 asm ( XEN_REG3 ) = arg3;
register unsigned long reg4 asm ( XEN_REG4 ) = arg4;
unsigned long retval;
__asm__ __volatile__ ( "call *%5"
: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 ),
"+r" ( reg3 ), "+r" ( reg4 )
: "r" ( &xen->hypercall[hypercall] )
: XEN_REG5, "memory" );
return retval;
}
/**
* Issue hypercall with five arguments
*
* @v xen Xen hypervisor
* @v hypercall Hypercall number
* @v arg1 First argument
* @v arg2 Second argument
* @v arg3 Third argument
* @v arg4 Fourth argument
* @v arg5 Fifth argument
* @ret retval Return value
*/
static inline __attribute__ (( always_inline )) unsigned long
xen_hypercall_5 ( struct xen_hypervisor *xen, unsigned int hypercall,
unsigned long arg1, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5 ) {
register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
register unsigned long reg3 asm ( XEN_REG3 ) = arg3;
register unsigned long reg4 asm ( XEN_REG4 ) = arg4;
register unsigned long reg5 asm ( XEN_REG5 ) = arg5;
unsigned long retval;
__asm__ __volatile__ ( "call *%6"
: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 ),
"+r" ( reg3 ), "+r" ( reg4 ), "+r" ( reg5 )
: "r" ( &xen->hypercall[hypercall] )
: "memory" );
return retval;
}
/**
* Test and clear pending event
*
* @v xen Xen hypervisor
* @v port Event channel port
* @ret pending Event was pending
*/
static inline __attribute__ (( always_inline )) uint8_t
xenevent_pending ( struct xen_hypervisor *xen, evtchn_port_t port ) {
uint8_t pending;
__asm__ __volatile__ ( "lock btr %2, %0\n\t"
"setc %1\n\t"
: "+m" ( xen->shared->evtchn_pending ),
"=a" ( pending )
: "Ir" ( port ) );
return pending;
}
#endif /* _BITS_XEN_H */
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