/******************************************************************************
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* hypercall.h
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*
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* Linux-specific hypervisor handling.
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*
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* Copyright (c) 2002-2004, K A Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef _ASM_X86_XEN_HYPERCALL_H
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#define _ASM_X86_XEN_HYPERCALL_H
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/pgtable.h>
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#include <trace/events/xen.h>
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#include <asm/page.h>
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#include <asm/smap.h>
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#include <asm/nospec-branch.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/sched.h>
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#include <xen/interface/physdev.h>
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#include <xen/interface/platform.h>
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#include <xen/interface/xen-mca.h>
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struct xen_dm_op_buf;
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/*
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* The hypercall asms have to meet several constraints:
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* - Work on 32- and 64-bit.
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* The two architectures put their arguments in different sets of
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* registers.
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*
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* - Work around asm syntax quirks
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* It isn't possible to specify one of the rNN registers in a
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* constraint, so we use explicit register variables to get the
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* args into the right place.
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*
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* - Mark all registers as potentially clobbered
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* Even unused parameters can be clobbered by the hypervisor, so we
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* need to make sure gcc knows it.
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*
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* - Avoid compiler bugs.
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* This is the tricky part. Because x86_32 has such a constrained
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* register set, gcc versions below 4.3 have trouble generating
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* code when all the arg registers and memory are trashed by the
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* asm. There are syntactically simpler ways of achieving the
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* semantics below, but they cause the compiler to crash.
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*
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* The only combination I found which works is:
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* - assign the __argX variables first
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* - list all actually used parameters as "+r" (__argX)
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* - clobber the rest
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*
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* The result certainly isn't pretty, and it really shows up cpp's
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* weakness as a macro language. Sorry. (But let's just give thanks
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* there aren't more than 5 arguments...)
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*/
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extern struct { char _entry[32]; } hypercall_page[];
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#define __HYPERCALL "call hypercall_page+%c[offset]"
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#define __HYPERCALL_ENTRY(x) \
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[offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
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#ifdef CONFIG_X86_32
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#define __HYPERCALL_RETREG "eax"
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#define __HYPERCALL_ARG1REG "ebx"
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#define __HYPERCALL_ARG2REG "ecx"
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#define __HYPERCALL_ARG3REG "edx"
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#define __HYPERCALL_ARG4REG "esi"
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#define __HYPERCALL_ARG5REG "edi"
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#else
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#define __HYPERCALL_RETREG "rax"
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#define __HYPERCALL_ARG1REG "rdi"
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#define __HYPERCALL_ARG2REG "rsi"
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#define __HYPERCALL_ARG3REG "rdx"
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#define __HYPERCALL_ARG4REG "r10"
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#define __HYPERCALL_ARG5REG "r8"
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#endif
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#define __HYPERCALL_DECLS \
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register unsigned long __res asm(__HYPERCALL_RETREG); \
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register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
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register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
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register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
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register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
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register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
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#define __HYPERCALL_0PARAM "=r" (__res), ASM_CALL_CONSTRAINT
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#define __HYPERCALL_1PARAM __HYPERCALL_0PARAM, "+r" (__arg1)
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#define __HYPERCALL_2PARAM __HYPERCALL_1PARAM, "+r" (__arg2)
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#define __HYPERCALL_3PARAM __HYPERCALL_2PARAM, "+r" (__arg3)
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#define __HYPERCALL_4PARAM __HYPERCALL_3PARAM, "+r" (__arg4)
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#define __HYPERCALL_5PARAM __HYPERCALL_4PARAM, "+r" (__arg5)
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#define __HYPERCALL_0ARG()
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#define __HYPERCALL_1ARG(a1) \
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__HYPERCALL_0ARG() __arg1 = (unsigned long)(a1);
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#define __HYPERCALL_2ARG(a1,a2) \
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__HYPERCALL_1ARG(a1) __arg2 = (unsigned long)(a2);
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#define __HYPERCALL_3ARG(a1,a2,a3) \
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__HYPERCALL_2ARG(a1,a2) __arg3 = (unsigned long)(a3);
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#define __HYPERCALL_4ARG(a1,a2,a3,a4) \
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__HYPERCALL_3ARG(a1,a2,a3) __arg4 = (unsigned long)(a4);
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#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) \
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__HYPERCALL_4ARG(a1,a2,a3,a4) __arg5 = (unsigned long)(a5);
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#define __HYPERCALL_CLOBBER5 "memory"
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#define __HYPERCALL_CLOBBER4 __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
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#define __HYPERCALL_CLOBBER3 __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
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#define __HYPERCALL_CLOBBER2 __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
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#define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
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#define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
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#define _hypercall0(type, name) \
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({ \
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__HYPERCALL_DECLS; \
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__HYPERCALL_0ARG(); \
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asm volatile (__HYPERCALL \
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: __HYPERCALL_0PARAM \
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: __HYPERCALL_ENTRY(name) \
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: __HYPERCALL_CLOBBER0); \
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(type)__res; \
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})
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#define _hypercall1(type, name, a1) \
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({ \
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__HYPERCALL_DECLS; \
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__HYPERCALL_1ARG(a1); \
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asm volatile (__HYPERCALL \
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: __HYPERCALL_1PARAM \
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: __HYPERCALL_ENTRY(name) \
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: __HYPERCALL_CLOBBER1); \
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(type)__res; \
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})
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#define _hypercall2(type, name, a1, a2) \
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({ \
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__HYPERCALL_DECLS; \
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__HYPERCALL_2ARG(a1, a2); \
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asm volatile (__HYPERCALL \
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: __HYPERCALL_2PARAM \
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: __HYPERCALL_ENTRY(name) \
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: __HYPERCALL_CLOBBER2); \
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(type)__res; \
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})
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#define _hypercall3(type, name, a1, a2, a3) \
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({ \
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__HYPERCALL_DECLS; \
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__HYPERCALL_3ARG(a1, a2, a3); \
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asm volatile (__HYPERCALL \
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: __HYPERCALL_3PARAM \
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: __HYPERCALL_ENTRY(name) \
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: __HYPERCALL_CLOBBER3); \
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(type)__res; \
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})
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#define _hypercall4(type, name, a1, a2, a3, a4) \
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({ \
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__HYPERCALL_DECLS; \
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__HYPERCALL_4ARG(a1, a2, a3, a4); \
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asm volatile (__HYPERCALL \
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: __HYPERCALL_4PARAM \
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: __HYPERCALL_ENTRY(name) \
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: __HYPERCALL_CLOBBER4); \
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(type)__res; \
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})
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static inline long
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xen_single_call(unsigned int call,
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unsigned long a1, unsigned long a2,
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unsigned long a3, unsigned long a4,
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unsigned long a5)
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{
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__HYPERCALL_DECLS;
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__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
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if (call >= PAGE_SIZE / sizeof(hypercall_page[0]))
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return -EINVAL;
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asm volatile(CALL_NOSPEC
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: __HYPERCALL_5PARAM
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: [thunk_target] "a" (&hypercall_page[call])
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: __HYPERCALL_CLOBBER5);
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return (long)__res;
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}
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static __always_inline void __xen_stac(void)
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{
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/*
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* Suppress objtool seeing the STAC/CLAC and getting confused about it
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* calling random code with AC=1.
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*/
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asm volatile(ANNOTATE_IGNORE_ALTERNATIVE
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ASM_STAC ::: "memory", "flags");
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}
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static __always_inline void __xen_clac(void)
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{
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asm volatile(ANNOTATE_IGNORE_ALTERNATIVE
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ASM_CLAC ::: "memory", "flags");
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}
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static inline long
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privcmd_call(unsigned int call,
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unsigned long a1, unsigned long a2,
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unsigned long a3, unsigned long a4,
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unsigned long a5)
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{
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long res;
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__xen_stac();
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res = xen_single_call(call, a1, a2, a3, a4, a5);
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__xen_clac();
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return res;
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}
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static inline int
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HYPERVISOR_set_trap_table(struct trap_info *table)
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{
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return _hypercall1(int, set_trap_table, table);
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}
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static inline int
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HYPERVISOR_mmu_update(struct mmu_update *req, int count,
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int *success_count, domid_t domid)
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{
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return _hypercall4(int, mmu_update, req, count, success_count, domid);
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}
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static inline int
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HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
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int *success_count, domid_t domid)
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{
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return _hypercall4(int, mmuext_op, op, count, success_count, domid);
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}
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static inline int
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HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
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{
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return _hypercall2(int, set_gdt, frame_list, entries);
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}
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static inline int
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HYPERVISOR_callback_op(int cmd, void *arg)
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{
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return _hypercall2(int, callback_op, cmd, arg);
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}
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static inline int
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HYPERVISOR_sched_op(int cmd, void *arg)
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{
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return _hypercall2(int, sched_op, cmd, arg);
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}
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static inline long
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HYPERVISOR_set_timer_op(u64 timeout)
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{
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unsigned long timeout_hi = (unsigned long)(timeout>>32);
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unsigned long timeout_lo = (unsigned long)timeout;
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return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
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}
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static inline int
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HYPERVISOR_mca(struct xen_mc *mc_op)
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{
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mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
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return _hypercall1(int, mca, mc_op);
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}
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static inline int
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HYPERVISOR_platform_op(struct xen_platform_op *op)
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{
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op->interface_version = XENPF_INTERFACE_VERSION;
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return _hypercall1(int, platform_op, op);
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}
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static inline int
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HYPERVISOR_set_debugreg(int reg, unsigned long value)
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{
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return _hypercall2(int, set_debugreg, reg, value);
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}
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static inline unsigned long
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HYPERVISOR_get_debugreg(int reg)
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{
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return _hypercall1(unsigned long, get_debugreg, reg);
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}
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static inline int
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HYPERVISOR_update_descriptor(u64 ma, u64 desc)
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{
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if (sizeof(u64) == sizeof(long))
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return _hypercall2(int, update_descriptor, ma, desc);
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return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
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}
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static inline long
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HYPERVISOR_memory_op(unsigned int cmd, void *arg)
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{
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return _hypercall2(long, memory_op, cmd, arg);
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}
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static inline int
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HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
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{
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return _hypercall2(int, multicall, call_list, nr_calls);
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}
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static inline int
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HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
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unsigned long flags)
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{
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if (sizeof(new_val) == sizeof(long))
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return _hypercall3(int, update_va_mapping, va,
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new_val.pte, flags);
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else
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return _hypercall4(int, update_va_mapping, va,
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new_val.pte, new_val.pte >> 32, flags);
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}
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static inline int
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HYPERVISOR_event_channel_op(int cmd, void *arg)
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{
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return _hypercall2(int, event_channel_op, cmd, arg);
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}
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static inline int
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HYPERVISOR_xen_version(int cmd, void *arg)
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{
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return _hypercall2(int, xen_version, cmd, arg);
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}
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static inline int
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HYPERVISOR_console_io(int cmd, int count, char *str)
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{
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return _hypercall3(int, console_io, cmd, count, str);
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}
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static inline int
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HYPERVISOR_physdev_op(int cmd, void *arg)
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{
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return _hypercall2(int, physdev_op, cmd, arg);
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}
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static inline int
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HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
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{
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return _hypercall3(int, grant_table_op, cmd, uop, count);
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}
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static inline int
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HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
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{
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return _hypercall2(int, vm_assist, cmd, type);
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}
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static inline int
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HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
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{
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return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
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}
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#ifdef CONFIG_X86_64
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static inline int
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HYPERVISOR_set_segment_base(int reg, unsigned long value)
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{
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return _hypercall2(int, set_segment_base, reg, value);
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}
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#endif
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static inline int
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HYPERVISOR_suspend(unsigned long start_info_mfn)
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{
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struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
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/*
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* For a PV guest the tools require that the start_info mfn be
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* present in rdx/edx when the hypercall is made. Per the
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* hypercall calling convention this is the third hypercall
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* argument, which is start_info_mfn here.
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*/
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return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
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}
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static inline unsigned long __must_check
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HYPERVISOR_hvm_op(int op, void *arg)
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{
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return _hypercall2(unsigned long, hvm_op, op, arg);
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}
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static inline int
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HYPERVISOR_tmem_op(
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struct tmem_op *op)
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{
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return _hypercall1(int, tmem_op, op);
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}
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static inline int
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HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
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{
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return _hypercall2(int, xenpmu_op, op, arg);
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}
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static inline int
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HYPERVISOR_dm_op(
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domid_t dom, unsigned int nr_bufs, struct xen_dm_op_buf *bufs)
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{
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int ret;
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__xen_stac();
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ret = _hypercall3(int, dm_op, dom, nr_bufs, bufs);
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__xen_clac();
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return ret;
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}
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static inline void
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MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
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{
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mcl->op = __HYPERVISOR_fpu_taskswitch;
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mcl->args[0] = set;
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trace_xen_mc_entry(mcl, 1);
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}
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static inline void
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MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
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pte_t new_val, unsigned long flags)
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{
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mcl->op = __HYPERVISOR_update_va_mapping;
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mcl->args[0] = va;
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if (sizeof(new_val) == sizeof(long)) {
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mcl->args[1] = new_val.pte;
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mcl->args[2] = flags;
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} else {
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mcl->args[1] = new_val.pte;
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mcl->args[2] = new_val.pte >> 32;
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mcl->args[3] = flags;
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}
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trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
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}
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static inline void
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MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
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struct desc_struct desc)
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{
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mcl->op = __HYPERVISOR_update_descriptor;
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if (sizeof(maddr) == sizeof(long)) {
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mcl->args[0] = maddr;
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mcl->args[1] = *(unsigned long *)&desc;
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} else {
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u32 *p = (u32 *)&desc;
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mcl->args[0] = maddr;
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mcl->args[1] = maddr >> 32;
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mcl->args[2] = *p++;
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mcl->args[3] = *p;
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}
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trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
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}
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static inline void
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MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
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int count, int *success_count, domid_t domid)
|
{
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mcl->op = __HYPERVISOR_mmu_update;
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mcl->args[0] = (unsigned long)req;
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mcl->args[1] = count;
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mcl->args[2] = (unsigned long)success_count;
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mcl->args[3] = domid;
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trace_xen_mc_entry(mcl, 4);
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}
|
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static inline void
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MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
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int *success_count, domid_t domid)
|
{
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mcl->op = __HYPERVISOR_mmuext_op;
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mcl->args[0] = (unsigned long)op;
|
mcl->args[1] = count;
|
mcl->args[2] = (unsigned long)success_count;
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mcl->args[3] = domid;
|
|
trace_xen_mc_entry(mcl, 4);
|
}
|
|
static inline void
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MULTI_stack_switch(struct multicall_entry *mcl,
|
unsigned long ss, unsigned long esp)
|
{
|
mcl->op = __HYPERVISOR_stack_switch;
|
mcl->args[0] = ss;
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mcl->args[1] = esp;
|
|
trace_xen_mc_entry(mcl, 2);
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}
|
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#endif /* _ASM_X86_XEN_HYPERCALL_H */
|
