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/* SPDX-License-Identifier: GPL-2.0-only */
/******************************************************************************
* asm-x86/guest/hyperv.h
*
* Copyright (c) 2019 Microsoft.
*/
#ifndef __X86_GUEST_HYPERV_H__
#define __X86_GUEST_HYPERV_H__
#include <xen/types.h>
/* Use top-most MFN for hypercall page */
#define HV_HCALL_MFN (((1ull << paddr_bits) - 1) >> HV_HYP_PAGE_SHIFT)
/*
* The specification says: "The partition reference time is computed
* by the following formula:
*
* ReferenceTime = ((VirtualTsc * TscScale) >> 64) + TscOffset
*
* The multiplication is a 64 bit multiplication, which results in a
* 128 bit number which is then shifted 64 times to the right to obtain
* the high 64 bits."
*/
static inline uint64_t hv_scale_tsc(uint64_t tsc, uint64_t scale,
int64_t offset)
{
uint64_t result;
/*
* Quadword MUL takes an implicit operand in RAX, and puts the result
* in RDX:RAX. Because we only want the result of the multiplication
* after shifting right by 64 bits, we therefore only need the content
* of RDX.
*/
asm ( "mulq %[scale]"
: "+a" (tsc), "=d" (result)
: [scale] "rm" (scale) );
return result + offset;
}
#ifdef CONFIG_HYPERV_GUEST
#include <asm/guest/hypervisor.h>
struct ms_hyperv_info {
uint32_t features;
uint32_t misc_features;
uint32_t hints;
uint32_t nested_features;
uint32_t max_vp_index;
uint32_t max_lp_index;
};
extern struct ms_hyperv_info ms_hyperv;
const struct hypervisor_ops *hyperv_probe(void);
#else
static inline const struct hypervisor_ops *hyperv_probe(void) { return NULL; }
#endif /* CONFIG_HYPERV_GUEST */
#endif /* __X86_GUEST_HYPERV_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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