From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 18:29:51 +0200
Subject: Adding upstream version 2.06.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 grub-core/boot/i386/qemu/boot.S | 74 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 grub-core/boot/i386/qemu/boot.S

(limited to 'grub-core/boot/i386/qemu/boot.S')

diff --git a/grub-core/boot/i386/qemu/boot.S b/grub-core/boot/i386/qemu/boot.S
new file mode 100644
index 0000000..8c3a1db
--- /dev/null
+++ b/grub-core/boot/i386/qemu/boot.S
@@ -0,0 +1,74 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <grub/symbol.h>
+#include <grub/machine/memory.h>
+#include <grub/machine/boot.h>
+#include <grub/machine/kernel.h>
+
+	.text
+	.code16
+	.globl _start
+_start:
+	/* Disable interrupts.  */
+	cli
+
+	jmp	1f
+
+	.org GRUB_BOOT_I386_QEMU_CORE_ENTRY_ADDR
+VARIABLE(grub_core_entry_addr)
+	.long	0
+1:
+
+	/* Set up %ds, %ss, and %es.  */
+	xorw	%ax, %ax
+	movw	%ax, %ds
+	movw	%ax, %ss
+	movw	%ax, %es
+
+	/* Set up the real mode stack.  */
+	movl	$GRUB_MEMORY_MACHINE_REAL_STACK, %esp
+
+	/* Transition to protected mode.  We use pushl to force generation
+	   of a flat return address.  */
+	pushl	$1f
+	jmp	real_to_prot
+	.code32
+1:
+	/* Ensure A20 is enabled. We're in qemu, so control port A works
+	   and there is no need to wait since there is no real logic, it's
+	   all emulated.  */
+	inb	$0x92
+	andb	$(~0x03), %al
+	orb	$0x02, %al
+	outb	$0x92
+	movl	EXT_C(grub_core_entry_addr), %edx
+	jmp	*%edx
+
+#include "../../../kern/i386/realmode.S"
+
+	/* Intel, in its infinite wisdom, decided to put the i8086 entry point
+	   *right here* and this is why we need this kludge.  */
+
+	.org GRUB_BOOT_MACHINE_SIZE - 16
+
+       .code16
+       
+	jmp	_start
+	.org GRUB_BOOT_MACHINE_SIZE
-- 
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