1 /* SPDX-License-Identifier: GPL-2.0 or MIT */ 2 #ifndef _ASM_X86_VMWARE_H 3 #define _ASM_X86_VMWARE_H 4 5 #include <asm/cpufeatures.h> 6 #include <asm/alternative.h> 7 8 /* 9 * The hypercall definitions differ in the low word of the %edx argument 10 * in the following way: the old port base interface uses the port 11 * number to distinguish between high- and low bandwidth versions. 12 * 13 * The new vmcall interface instead uses a set of flags to select 14 * bandwidth mode and transfer direction. The flags should be loaded 15 * into %dx by any user and are automatically replaced by the port 16 * number if the VMWARE_HYPERVISOR_PORT method is used. 17 * 18 * In short, new driver code should strictly use the new definition of 19 * %dx content. 20 */ 21 22 /* Old port-based version */ 23 #define VMWARE_HYPERVISOR_PORT "0x5658" 24 #define VMWARE_HYPERVISOR_PORT_HB "0x5659" 25 26 /* Current vmcall / vmmcall version */ 27 #define VMWARE_HYPERVISOR_HB BIT(0) 28 #define VMWARE_HYPERVISOR_OUT BIT(1) 29 30 /* The low bandwidth call. The low word of edx is presumed clear. */ 31 #define VMWARE_HYPERCALL \ 32 ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT ", %%dx; inl (%%dx)", \ 33 "vmcall", X86_FEATURE_VMCALL, \ 34 "vmmcall", X86_FEATURE_VMW_VMMCALL) 35 36 /* 37 * The high bandwidth out call. The low word of edx is presumed to have the 38 * HB and OUT bits set. 39 */ 40 #define VMWARE_HYPERCALL_HB_OUT \ 41 ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT_HB ", %%dx; rep outsb", \ 42 "vmcall", X86_FEATURE_VMCALL, \ 43 "vmmcall", X86_FEATURE_VMW_VMMCALL) 44 45 /* 46 * The high bandwidth in call. The low word of edx is presumed to have the 47 * HB bit set. 48 */ 49 #define VMWARE_HYPERCALL_HB_IN \ 50 ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT_HB ", %%dx; rep insb", \ 51 "vmcall", X86_FEATURE_VMCALL, \ 52 "vmmcall", X86_FEATURE_VMW_VMMCALL) 53 #endif 54