| 1 | /* SPDX-License-Identifier: GPL-2.0 or MIT */ |
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| 2 | #ifndef _ASM_X86_VMWARE_H |
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| 3 | #define _ASM_X86_VMWARE_H |
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| 4 | |
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| 5 | #include <asm/cpufeatures.h> |
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| 6 | #include <asm/alternative.h> |
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| 7 | #include <linux/stringify.h> |
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| 8 | |
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| 9 | /* |
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| 10 | * The hypercall definitions differ in the low word of the %edx argument |
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| 11 | * in the following way: the old port base interface uses the port |
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| 12 | * number to distinguish between high- and low bandwidth versions. |
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| 13 | * |
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| 14 | * The new vmcall interface instead uses a set of flags to select |
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| 15 | * bandwidth mode and transfer direction. The flags should be loaded |
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| 16 | * into %dx by any user and are automatically replaced by the port |
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| 17 | * number if the VMWARE_HYPERVISOR_PORT method is used. |
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| 18 | * |
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| 19 | * In short, new driver code should strictly use the new definition of |
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| 20 | * %dx content. |
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| 21 | */ |
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| 22 | |
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| 23 | /* Old port-based version */ |
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| 24 | #define VMWARE_HYPERVISOR_PORT 0x5658 |
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| 25 | #define VMWARE_HYPERVISOR_PORT_HB 0x5659 |
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| 26 | |
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| 27 | /* Current vmcall / vmmcall version */ |
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| 28 | #define VMWARE_HYPERVISOR_HB BIT(0) |
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| 29 | #define VMWARE_HYPERVISOR_OUT BIT(1) |
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| 30 | |
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| 31 | /* The low bandwidth call. The low word of edx is presumed clear. */ |
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| 32 | #define VMWARE_HYPERCALL \ |
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| 33 | ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT) ", %%dx; " \ |
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| 34 | "inl (%%dx), %%eax", \ |
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| 35 | "vmcall", X86_FEATURE_VMCALL, \ |
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| 36 | "vmmcall", X86_FEATURE_VMW_VMMCALL) |
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| 37 | |
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| 38 | /* |
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| 39 | * The high bandwidth out call. The low word of edx is presumed to have the |
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| 40 | * HB and OUT bits set. |
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| 41 | */ |
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| 42 | #define VMWARE_HYPERCALL_HB_OUT \ |
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| 43 | ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT_HB) ", %%dx; " \ |
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| 44 | "rep outsb", \ |
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| 45 | "vmcall", X86_FEATURE_VMCALL, \ |
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| 46 | "vmmcall", X86_FEATURE_VMW_VMMCALL) |
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| 47 | |
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| 48 | /* |
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| 49 | * The high bandwidth in call. The low word of edx is presumed to have the |
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| 50 | * HB bit set. |
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| 51 | */ |
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| 52 | #define VMWARE_HYPERCALL_HB_IN \ |
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| 53 | ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT_HB) ", %%dx; " \ |
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| 54 | "rep insb", \ |
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| 55 | "vmcall", X86_FEATURE_VMCALL, \ |
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| 56 | "vmmcall", X86_FEATURE_VMW_VMMCALL) |
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| 57 | #endif |
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| 58 | |
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