Neat when doing ResetVector coding.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
OvmfPkg/ResetVector/DebugCon.asm | 43 +++++++++++++++++++++++++++
OvmfPkg/ResetVector/ResetVector.nasmb | 2 +-
2 files changed, 44 insertions(+), 1 deletion(-)
create mode 100644 OvmfPkg/ResetVector/DebugCon.asm
diff --git a/OvmfPkg/ResetVector/DebugCon.asm b/OvmfPkg/ResetVector/DebugCon.asm
new file mode 100644
index 000000000000..9c57d1a52c75
--- /dev/null
+++ b/OvmfPkg/ResetVector/DebugCon.asm
@@ -0,0 +1,43 @@
+;------------------------------------------------------------------------------
+; @file
+; qemu debug console support macros (based on serial port macros)
+;
+; Copyright (c) 2008 - 2018, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;------------------------------------------------------------------------------
+
+%macro outToDebugPort 1
+ mov dx, 0x402
+ mov al, %1
+ out dx, al
+%endmacro
+
+%macro debugShowCharacter 1
+ outToDebugPort %1
+%endmacro
+
+%macro debugShowHexDigit 1
+ %if (%1 < 0xa)
+ debugShowCharacter BYTE ('0' + (%1))
+ %else
+ debugShowCharacter BYTE ('a' + ((%1) - 0xa))
+ %endif
+%endmacro
+
+%macro debugNewline 0
+ debugShowCharacter `\r`
+ debugShowCharacter `\n`
+%endmacro
+
+%macro debugShowPostCode 1
+ debugShowHexDigit (((%1) >> 4) & 0xf)
+ debugShowHexDigit ((%1) & 0xf)
+ debugNewline
+%endmacro
+
+BITS 16
+
+%macro debugInitialize 0
+ ; not required
+%endmacro
diff --git a/OvmfPkg/ResetVector/ResetVector.nasmb
b/OvmfPkg/ResetVector/ResetVector.nasmb
index 5832aaa8abf7..f1655ddfcde3 100644
--- a/OvmfPkg/ResetVector/ResetVector.nasmb
+++ b/OvmfPkg/ResetVector/ResetVector.nasmb
@@ -41,7 +41,7 @@
%elifdef DEBUG_SERIAL
%include "SerialDebug.asm"
%else
- %include "DebugDisabled.asm"
+ %include "DebugCon.asm"
%endif
%include "Ia32/SearchForBfvBase.asm"
--
2.43.0
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