From 98c7cb3be73d0f15151133abe91bc880a4400794 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 29 Jan 2024 13:29:29 +0100
Subject: OvmfPkg/ResetVector: send post codes to qemu debug console

Neat when doing ResetVector coding.
Incompatible with TDX and SEV, therefore not enabled by default.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Erdem Aktas <erdemaktas@google.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20240129122929.349726-1-kraxel@redhat.com>
[lersek@redhat.com: replace "SEV" with "SEV-ES/SEV-SNP" in comment]
---
 OvmfPkg/ResetVector/QemuDebugCon.asm | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 OvmfPkg/ResetVector/QemuDebugCon.asm

(limited to 'OvmfPkg/ResetVector/QemuDebugCon.asm')

diff --git a/OvmfPkg/ResetVector/QemuDebugCon.asm b/OvmfPkg/ResetVector/QemuDebugCon.asm
new file mode 100644
index 0000000..8729fc2
--- /dev/null
+++ b/OvmfPkg/ResetVector/QemuDebugCon.asm
@@ -0,0 +1,36 @@
+;------------------------------------------------------------------------------
+; @file
+; qemu debug console support macros (based on serial port macros)
+;
+; Copyright (c) 2008 - 2018, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2024, Red Hat, Inc.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;------------------------------------------------------------------------------
+
+%macro  debugShowCharacter 1
+    mov     dx, 0x402
+    mov     al, %1
+    out     dx, al
+%endmacro
+
+%macro  debugShowHexDigit 1
+  %if (%1 < 0xa)
+    debugShowCharacter BYTE ('0' + (%1))
+  %else
+    debugShowCharacter BYTE ('a' + ((%1) - 0xa))
+  %endif
+%endmacro
+
+%macro  debugShowPostCode 1
+    debugShowHexDigit (((%1) >> 4) & 0xf)
+    debugShowHexDigit ((%1) & 0xf)
+    debugShowCharacter `\r`
+    debugShowCharacter `\n`
+%endmacro
+
+BITS    16
+
+%macro  debugInitialize 0
+    ; not required
+%endmacro
-- 
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