arch/x86/include/asm/vmware.h

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