/* SPDX-License-Identifier: GPL-2.0 or MIT */
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#ifndef _ASM_X86_VMWARE_H
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#define _ASM_X86_VMWARE_H
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#include <asm/cpufeatures.h>
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#include <asm/alternative.h>
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#include <linux/stringify.h>
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/*
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* The hypercall definitions differ in the low word of the %edx argument
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* in the following way: the old port base interface uses the port
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* number to distinguish between high- and low bandwidth versions.
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*
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* The new vmcall interface instead uses a set of flags to select
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* bandwidth mode and transfer direction. The flags should be loaded
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* into %dx by any user and are automatically replaced by the port
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* number if the VMWARE_HYPERVISOR_PORT method is used.
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*
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* In short, new driver code should strictly use the new definition of
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* %dx content.
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*/
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/* Old port-based version */
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#define VMWARE_HYPERVISOR_PORT 0x5658
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#define VMWARE_HYPERVISOR_PORT_HB 0x5659
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/* Current vmcall / vmmcall version */
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#define VMWARE_HYPERVISOR_HB BIT(0)
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#define VMWARE_HYPERVISOR_OUT BIT(1)
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/* The low bandwidth call. The low word of edx is presumed clear. */
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#define VMWARE_HYPERCALL \
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ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT) ", %%dx; " \
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"inl (%%dx), %%eax", \
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"vmcall", X86_FEATURE_VMCALL, \
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"vmmcall", X86_FEATURE_VMW_VMMCALL)
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/*
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* The high bandwidth out call. The low word of edx is presumed to have the
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* HB and OUT bits set.
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*/
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#define VMWARE_HYPERCALL_HB_OUT \
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ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT_HB) ", %%dx; " \
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"rep outsb", \
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"vmcall", X86_FEATURE_VMCALL, \
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"vmmcall", X86_FEATURE_VMW_VMMCALL)
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/*
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* The high bandwidth in call. The low word of edx is presumed to have the
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* HB bit set.
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*/
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#define VMWARE_HYPERCALL_HB_IN \
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ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT_HB) ", %%dx; " \
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"rep insb", \
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"vmcall", X86_FEATURE_VMCALL, \
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"vmmcall", X86_FEATURE_VMW_VMMCALL)
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#endif
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