155 lines
4.6 KiB
C
155 lines
4.6 KiB
C
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/*
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* asm-s390/kvm_para.h - definition for paravirtual devices on s390
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*
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* Copyright IBM Corp. 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#ifndef __S390_KVM_PARA_H
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#define __S390_KVM_PARA_H
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#ifdef __KERNEL__
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/*
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* Hypercalls for KVM on s390. The calling convention is similar to the
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* s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
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* as hypercall number and R7 as parameter 6. The return value is
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* written to R2. We use the diagnose instruction as hypercall. To avoid
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* conflicts with existing diagnoses for LPAR and z/VM, we do not use
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* the instruction encoded number, but specify the number in R1 and
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* use 0x500 as KVM hypercall
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*
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* Copyright IBM Corp. 2007,2008
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* Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*/
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static inline long kvm_hypercall0(unsigned long nr)
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{
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register unsigned long __nr asm("1") = nr;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr): "memory", "cc");
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return __rc;
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}
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static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
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{
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register unsigned long __nr asm("1") = nr;
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register unsigned long __p1 asm("2") = p1;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
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return __rc;
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}
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static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
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unsigned long p2)
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{
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register unsigned long __nr asm("1") = nr;
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register unsigned long __p1 asm("2") = p1;
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register unsigned long __p2 asm("3") = p2;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
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: "memory", "cc");
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return __rc;
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}
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static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
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unsigned long p2, unsigned long p3)
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{
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register unsigned long __nr asm("1") = nr;
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register unsigned long __p1 asm("2") = p1;
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register unsigned long __p2 asm("3") = p2;
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register unsigned long __p3 asm("4") = p3;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
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"d" (__p3) : "memory", "cc");
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return __rc;
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}
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static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
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unsigned long p2, unsigned long p3,
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unsigned long p4)
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{
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register unsigned long __nr asm("1") = nr;
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register unsigned long __p1 asm("2") = p1;
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register unsigned long __p2 asm("3") = p2;
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register unsigned long __p3 asm("4") = p3;
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register unsigned long __p4 asm("5") = p4;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
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"d" (__p3), "d" (__p4) : "memory", "cc");
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return __rc;
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}
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static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
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unsigned long p2, unsigned long p3,
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unsigned long p4, unsigned long p5)
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{
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register unsigned long __nr asm("1") = nr;
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register unsigned long __p1 asm("2") = p1;
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register unsigned long __p2 asm("3") = p2;
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register unsigned long __p3 asm("4") = p3;
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register unsigned long __p4 asm("5") = p4;
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register unsigned long __p5 asm("6") = p5;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
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"d" (__p3), "d" (__p4), "d" (__p5) : "memory", "cc");
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return __rc;
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}
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static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
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unsigned long p2, unsigned long p3,
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unsigned long p4, unsigned long p5,
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unsigned long p6)
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{
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register unsigned long __nr asm("1") = nr;
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register unsigned long __p1 asm("2") = p1;
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register unsigned long __p2 asm("3") = p2;
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register unsigned long __p3 asm("4") = p3;
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register unsigned long __p4 asm("5") = p4;
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register unsigned long __p5 asm("6") = p5;
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register unsigned long __p6 asm("7") = p6;
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register long __rc asm("2");
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asm volatile ("diag 2,4,0x500\n"
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: "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
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"d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
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: "memory", "cc");
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return __rc;
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}
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/* kvm on s390 is always paravirtualization enabled */
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static inline int kvm_para_available(void)
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{
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return 1;
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}
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/* No feature bits are currently assigned for kvm on s390 */
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static inline unsigned int kvm_arch_para_features(void)
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{
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return 0;
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}
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#endif
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#endif /* __S390_KVM_PARA_H */
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