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https://github.com/ipxe/ipxe
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036af27a45
Add basic support for Xen PV-HVM domains (detected via the Xen platform PCI device with IDs 5853:0001), including support for accessing configuration via XenStore and enumerating devices via XenBus. Signed-off-by: Michael Brown <mcb30@ipxe.org>
165 lines
4.6 KiB
C
165 lines
4.6 KiB
C
#ifndef _BITS_XEN_H
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#define _BITS_XEN_H
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/** @file
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*
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* Xen interface
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/* Hypercall registers */
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#ifdef __x86_64__
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#define XEN_REG1 "rdi"
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#define XEN_REG2 "rsi"
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#define XEN_REG3 "rdx"
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#define XEN_REG4 "r10"
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#define XEN_REG5 "r8"
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#else
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#define XEN_REG1 "ebx"
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#define XEN_REG2 "ecx"
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#define XEN_REG3 "edx"
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#define XEN_REG4 "esi"
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#define XEN_REG5 "edi"
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#endif
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/** A hypercall entry point */
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struct xen_hypercall {
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/** Code generated by hypervisor */
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uint8_t code[32];
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} __attribute__ (( packed ));
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/**
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* Issue hypercall with one argument
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*
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* @v xen Xen hypervisor
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* @v hypercall Hypercall number
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* @v arg1 First argument
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* @ret retval Return value
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*/
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static inline __attribute__ (( always_inline )) unsigned long
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xen_hypercall_1 ( struct xen_hypervisor *xen, unsigned int hypercall,
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unsigned long arg1 ) {
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register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
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unsigned long retval;
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__asm__ __volatile__ ( "call *%2"
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: "=a" ( retval ), "+r" ( reg1 )
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: "r" ( &xen->hypercall[hypercall] )
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: XEN_REG2, XEN_REG3, XEN_REG4, XEN_REG5,
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"memory" );
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return retval;
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}
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/**
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* Issue hypercall with two arguments
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*
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* @v xen Xen hypervisor
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* @v hypercall Hypercall number
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* @v arg1 First argument
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* @v arg2 Second argument
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* @ret retval Return value
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*/
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static inline __attribute__ (( always_inline )) unsigned long
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xen_hypercall_2 ( struct xen_hypervisor *xen, unsigned int hypercall,
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unsigned long arg1, unsigned long arg2 ) {
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register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
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register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
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unsigned long retval;
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__asm__ __volatile__ ( "call *%3"
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: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 )
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: "r" ( &xen->hypercall[hypercall] )
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: XEN_REG3, XEN_REG4, XEN_REG5, "memory" );
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return retval;
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}
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/**
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* Issue hypercall with three arguments
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*
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* @v xen Xen hypervisor
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* @v hypercall Hypercall number
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* @v arg1 First argument
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* @v arg2 Second argument
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* @v arg3 Third argument
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* @ret retval Return value
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*/
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static inline __attribute__ (( always_inline )) unsigned long
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xen_hypercall_3 ( struct xen_hypervisor *xen, unsigned int hypercall,
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unsigned long arg1, unsigned long arg2, unsigned long arg3 ) {
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register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
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register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
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register unsigned long reg3 asm ( XEN_REG3 ) = arg3;
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unsigned long retval;
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__asm__ __volatile__ ( "call *%4"
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: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 ),
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"+r" ( reg3 )
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: "r" ( &xen->hypercall[hypercall] )
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: XEN_REG4, XEN_REG5, "memory" );
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return retval;
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}
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/**
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* Issue hypercall with four arguments
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*
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* @v xen Xen hypervisor
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* @v hypercall Hypercall number
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* @v arg1 First argument
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* @v arg2 Second argument
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* @v arg3 Third argument
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* @v arg4 Fourth argument
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* @ret retval Return value
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*/
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static inline __attribute__ (( always_inline )) unsigned long
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xen_hypercall_4 ( struct xen_hypervisor *xen, unsigned int hypercall,
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unsigned long arg1, unsigned long arg2, unsigned long arg3,
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unsigned long arg4 ) {
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register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
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register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
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register unsigned long reg3 asm ( XEN_REG3 ) = arg3;
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register unsigned long reg4 asm ( XEN_REG4 ) = arg4;
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unsigned long retval;
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__asm__ __volatile__ ( "call *%5"
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: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 ),
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"+r" ( reg3 ), "+r" ( reg4 )
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: "r" ( &xen->hypercall[hypercall] )
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: XEN_REG5, "memory" );
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return retval;
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}
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/**
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* Issue hypercall with five arguments
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*
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* @v xen Xen hypervisor
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* @v hypercall Hypercall number
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* @v arg1 First argument
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* @v arg2 Second argument
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* @v arg3 Third argument
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* @v arg4 Fourth argument
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* @v arg5 Fifth argument
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* @ret retval Return value
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*/
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static inline __attribute__ (( always_inline )) unsigned long
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xen_hypercall_5 ( struct xen_hypervisor *xen, unsigned int hypercall,
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unsigned long arg1, unsigned long arg2, unsigned long arg3,
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unsigned long arg4, unsigned long arg5 ) {
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register unsigned long reg1 asm ( XEN_REG1 ) = arg1;
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register unsigned long reg2 asm ( XEN_REG2 ) = arg2;
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register unsigned long reg3 asm ( XEN_REG3 ) = arg3;
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register unsigned long reg4 asm ( XEN_REG4 ) = arg4;
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register unsigned long reg5 asm ( XEN_REG5 ) = arg5;
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unsigned long retval;
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__asm__ __volatile__ ( "call *%6"
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: "=a" ( retval ), "+r" ( reg1 ), "+r" ( reg2 ),
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"+r" ( reg3 ), "+r" ( reg4 ), "+r" ( reg5 )
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: "r" ( &xen->hypercall[hypercall] )
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: "memory" );
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return retval;
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}
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#endif /* _BITS_XEN_H */
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