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