[PATCH 1/6] x86: Add VMWare Host Communication Macros

[Sinclair Yeh]

These macros will be used by multiple VMWare modules for handling
host communication.

Signed-off-by: Sinclair Yeh <syeh@xxxxxxxxxx>
Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Alok N Kataria <akataria@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Alok Kataria <akataria@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: Xavier Deguillard <xdeguillard@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---

v2:
* Keeping only the minimal common platform defines
* added vmware_platform() check function

v3:
* Added new field to handle different hypervisor magic values

v4:
* Make it so that "cmd" is always the first parameter for both
  High-Bandwidh and non-High-Bandwidth version of the macro
* Addressed comments from H. Peter Anvin on the assembly code
---
 arch/x86/include/asm/vmware.h | 126 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 arch/x86/include/asm/vmware.h

diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h
new file mode 100644
index 0000000..ad359e0
--- /dev/null
+++ b/arch/x86/include/asm/vmware.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2015, VMware, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * Based on code from vmware.c and vmmouse.c.
+ * Author:
+ *   Sinclair Yeh <syeh@xxxxxxxxxx>
+ */
+#ifndef _ASM_X86_VMWARE_H
+#define _ASM_X86_VMWARE_H
+
+
+/**
+ * Hypervisor-specific bi-directional communication channel.  Should never
+ * execute on bare metal hardware.  The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * The last two parameters are both input and output and must be initialized.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in1: [IN] Message Len
+ * @port_num: [IN] port number + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @eax: [OUT] value of EAX register
+ * @ebx: [OUT] e.g. status from an HB message status command
+ * @ecx: [OUT] e.g. status from a non-HB message status command
+ * @edx: [OUT] e.g. channel id
+ * @si: [INOUT] set to 0 if not used
+ * @di: [INOUT] set to 0 if not used
+ */
+#define VMW_PORT(cmd, in1, port_num, magic, eax, ebx, ecx, edx, si, di)	\
+({									\
+	asm volatile ("inl %%dx, %%eax;" :				\
+		"=a"(eax),						\
+		"=b"(ebx),						\
+		"=c"(ecx),						\
+		"=d"(edx),						\
+		"=S"(si),						\
+		"=D"(di) :						\
+		"a"(magic),						\
+		"b"(in1),						\
+		"c"(cmd),						\
+		"d"(port_num),						\
+		"S"(si),						\
+		"D"(di) :						\
+		"memory");						\
+})
+
+
+/**
+ * Hypervisor-specific bi-directional communication channel.  Should never
+ * execute on bare metal hardware.  The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * The last 3 parameters are both input and output and must be initialized.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in1: [IN] Message Len
+ * @port_num: [IN] port number + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @eax: [OUT] value of EAX register
+ * @ebx: [OUT] e.g. status from an HB message status command
+ * @ecx: [OUT] e.g. status from a non-HB message status command
+ * @edx: [OUT] e.g. channel id
+ * @si: [INOUT] set to 0 if not used
+ * @di: [INOUT] set to 0 if not used
+ * @bp: [INOUT] set to 0 if not used
+ */
+#define VMW_PORT_HB_OUT(cmd, in1, port_num, magic,	\
+			eax, ebx, ecx, edx, si, di, bp)	\
+({							\
+	asm volatile ("push %%rbp;"			\
+		"xchgq %6, %%rbp;"			\
+		"rep outsb;"				\
+		"xchgq %%rbp, %6;"			\
+		"pop %%rbp;" :				\
+		"=a"(eax),				\
+		"=b"(ebx),				\
+		"=c"(ecx),				\
+		"=d"(edx),				\
+		"+S"(si),				\
+		"+D"(di),				\
+		"+r"(bp) :				\
+		"a"(magic),				\
+		"b"(cmd),				\
+		"c"(in1),				\
+		"d"(port_num) :				\
+		"memory", "cc");			\
+})
+
+
+#define VMW_PORT_HB_IN(cmd, in1, port_num, magic,		\
+		       eax, ebx, ecx, edx, si, di, bp)		\
+({								\
+	asm volatile ("push %%rbp;"				\
+		"xchgq %6, %%rbp;"				\
+		"rep insb;"					\
+		"xchgq %%rbp, %6;"				\
+		"pop %%rbp" :					\
+		"=a"(eax),					\
+		"=b"(ebx),					\
+		"=c"(ecx),					\
+		"=d"(edx),					\
+		"+S"(si),					\
+		"+D"(di),					\
+		"+r"(bp) :					\
+		"a"(magic),					\
+		"b"(cmd),					\
+		"c"(in1),					\
+		"d"(port_num) :					\
+		"memory", "cc");				\
+})
+
+
+#endif
+
-- 
1.9.1

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