From abcbbb14a44a83b4cdf90137307a62e7b58e6720 Mon Sep 17 00:00:00 2001
From: Anthony PERARD <anthony.perard@citrix.com>
Date: Wed, 29 Oct 2014 06:49:10 +0000
Subject: OvmfPkg/XenBusDxe: Add support to make Xen Hypercalls.

Change in V4:
- Replace the license by the commonly used file header text.
- add file header to XenHypercall.h (license, copyright, brief desc)

Change in V3:
- adding IA32 support. (not reviewed yet)
  both XenBusDxe/Ia32/hypercall.{S,asm} file are new

Change in V2:
- file header, copyright
- Add License
- Add push/pop instruction.
- fix types
- Comment of exported functions
- Improve coding style
- Add error handling in the main init function (of the drivers)
- Comment assembly

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16260 6f19259b-4bc3-4df7-8a09-765794883524
---
 OvmfPkg/XenBusDxe/X64/hypercall.S   | 22 ++++++++++++++++++++++
 OvmfPkg/XenBusDxe/X64/hypercall.asm | 26 ++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 OvmfPkg/XenBusDxe/X64/hypercall.S
 create mode 100644 OvmfPkg/XenBusDxe/X64/hypercall.asm

(limited to 'OvmfPkg/XenBusDxe/X64')

diff --git a/OvmfPkg/XenBusDxe/X64/hypercall.S b/OvmfPkg/XenBusDxe/X64/hypercall.S
new file mode 100644
index 0000000000..83cf466953
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/X64/hypercall.S
@@ -0,0 +1,22 @@
+# INTN
+# EFIAPI
+# XenHypercall2 (
+#   IN     VOID *HypercallAddr,
+#   IN OUT INTN Arg1,
+#   IN OUT INTN Arg2
+#   );
+ASM_GLOBAL ASM_PFX(XenHypercall2)
+ASM_PFX(XenHypercall2):
+  push %rdi
+  push %rsi
+  # Copy HypercallAddr to rax
+  movq %rcx, %rax
+  # Copy Arg1 to the register expected by Xen
+  movq %rdx, %rdi
+  # Copy Arg2 to the register expected by Xen
+  movq %r8, %rsi
+  # Call HypercallAddr
+  call *%rax
+  pop %rsi
+  pop %rdi
+  ret
diff --git a/OvmfPkg/XenBusDxe/X64/hypercall.asm b/OvmfPkg/XenBusDxe/X64/hypercall.asm
new file mode 100644
index 0000000000..5b3451473d
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/X64/hypercall.asm
@@ -0,0 +1,26 @@
+.code
+
+; INTN
+; EFIAPI
+; XenHypercall2 (
+;   IN     VOID *HypercallAddr,
+;   IN OUT INTN Arg1,
+;   IN OUT INTN Arg2
+;   );
+XenHypercall2 PROC
+  push rdi
+  push rsi
+  ; Copy HypercallAddr to rax
+  mov rax, rcx
+  ; Copy Arg1 to the register expected by Xen
+  mov rdi, rdx
+  ; Copy Arg2 to the register expected by Xen
+  mov rsi, r8
+  ; Call HypercallAddr
+  call rax
+  pop rsi
+  pop rdi
+  ret
+XenHypercall2 ENDP
+
+END
-- 
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