Move common option rom code to header file

We will have a linux boot option rom soon, so let's take all functionality
that might be useful for both to a header file that both roms can include.

That way we only have to write fw_cfg access code once.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

2 files changed, 110 insertions, 76 deletions

diff --git a/pc-bios/optionrom/multiboot.S b/pc-bios/optionrom/multiboot.S
index dafac73..be5c9fc 100644
--- a/pc-bios/optionrom/multiboot.S
+++ b/pc-bios/optionrom/multiboot.S
@@ -18,86 +18,15 @@
  *   Authors: Alexander Graf <agraf@suse.de>
  */
 
-#define NO_QEMU_PROTOS
-#include "../../hw/fw_cfg.h"
-
-#define BIOS_CFG_IOPORT_CFG	0x510
-#define BIOS_CFG_IOPORT_DATA	0x511
+#include "optionrom.h"
 
 #define MULTIBOOT_MAGIC		0x2badb002
 
 #define GS_PROT_JUMP		0
 #define GS_GDT_DESC		6
 
-/* Break the translation block flow so -d cpu shows us values */
-#define DEBUG_HERE \
-	jmp		1f;				\
-	1:
-	
-/* Read a variable from the fw_cfg device.
-   Clobbers:	%edx
-   Out:		%eax */
-.macro read_fw VAR
-	mov		$\VAR, %ax
-	mov		$BIOS_CFG_IOPORT_CFG, %dx
-	outw		%ax, (%dx)
-	mov		$BIOS_CFG_IOPORT_DATA, %dx
-	inb		(%dx), %al
-	shl		$8, %eax
-	inb		(%dx), %al
-	shl		$8, %eax
-	inb		(%dx), %al
-	shl		$8, %eax
-	inb		(%dx), %al
-	bswap		%eax
-.endm
 
-/*
- * Read a blob from the fw_cfg device.
- * Requires _ADDR, _SIZE and _DATA values for the parameter.
- *
- * Clobbers:	%eax, %edx, %es, %ecx, %edi
- */
-#define read_fw_blob(var) \
-	read_fw		var ## _ADDR;			\
-	mov		%eax, %edi;			\
-	read_fw		var ## _SIZE;			\
-	mov		%eax, %ecx;			\
-	mov		$var ## _DATA, %ax;		\
-	mov		$BIOS_CFG_IOPORT_CFG, %edx;	\
-	outw		%ax, (%dx);			\
-	mov		$BIOS_CFG_IOPORT_DATA, %dx;	\
-	cld;						\
-	DEBUG_HERE \
-	rep insb	(%dx), %es:(%edi);
-
-.code16
-.text
-	.global 	_start
-_start:
-	.short		0xaa55
-	.byte		(_end - _start) / 512
-	push		%eax
-	push		%ds
-
-	/* setup ds so we can access the IVT */
-	xor		%ax, %ax
-	mov		%ax, %ds
-
-	/* install our int 19 handler */
-	movw		$int19_handler, (0x19*4)
-	mov		%cs, (0x19*4+2)
-
-	pop		%ds
-	pop		%eax
-	lret
-
-int19_handler:
-	/* DS = CS */
-	movw		%cs, %ax
-	movw		%ax, %ds
-
-	/* fall through */
+BOOT_ROM_START
 
 run_multiboot:
 
@@ -249,6 +178,4 @@ gdt_desc:
 .short	(5 * 8) - 1
 .long	gdt
 
-.align 512, 0
-_end:
-
+BOOT_ROM_END
diff --git a/pc-bios/optionrom/optionrom.h b/pc-bios/optionrom/optionrom.h
new file mode 100644
index 0000000..34d69af
--- /dev/null
+++ b/pc-bios/optionrom/optionrom.h
@@ -0,0 +1,107 @@
+/*
+ * Common Option ROM Functions
+ *
+ * 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. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright Novell Inc, 2009
+ *   Authors: Alexander Graf <agraf@suse.de>
+ */
+
+
+#define NO_QEMU_PROTOS
+#include "../../hw/fw_cfg.h"
+
+#define BIOS_CFG_IOPORT_CFG	0x510
+#define BIOS_CFG_IOPORT_DATA	0x511
+
+/* Break the translation block flow so -d cpu shows us values */
+#define DEBUG_HERE \
+	jmp		1f;				\
+	1:
+	
+/*
+ * Read a variable from the fw_cfg device.
+ * Clobbers:	%edx
+ * Out:		%eax
+ */
+.macro read_fw VAR
+	mov		$\VAR, %ax
+	mov		$BIOS_CFG_IOPORT_CFG, %dx
+	outw		%ax, (%dx)
+	mov		$BIOS_CFG_IOPORT_DATA, %dx
+	inb		(%dx), %al
+	shl		$8, %eax
+	inb		(%dx), %al
+	shl		$8, %eax
+	inb		(%dx), %al
+	shl		$8, %eax
+	inb		(%dx), %al
+	bswap		%eax
+.endm
+
+/*
+ * Read a blob from the fw_cfg device.
+ * Requires _ADDR, _SIZE and _DATA values for the parameter.
+ *
+ * Clobbers:	%eax, %edx, %es, %ecx, %edi
+ */
+#define read_fw_blob(var)				\
+	read_fw		var ## _ADDR;			\
+	mov		%eax, %edi;			\
+	read_fw		var ## _SIZE;			\
+	mov		%eax, %ecx;			\
+	mov		$var ## _DATA, %ax;		\
+	mov		$BIOS_CFG_IOPORT_CFG, %edx;	\
+	outw		%ax, (%dx);			\
+	mov		$BIOS_CFG_IOPORT_DATA, %dx;	\
+	cld;						\
+	rep insb	(%dx), %es:(%edi);
+
+#define OPTION_ROM_START					\
+    .code16;						\
+    .text;						\
+	.global 	_start;				\
+    _start:;						\
+	.short		0xaa55;				\
+	.byte		(_end - _start) / 512;
+
+#define BOOT_ROM_START					\
+	OPTION_ROM_START				\
+	push		%eax;				\
+	push		%ds;				\
+							\
+	/* setup ds so we can access the IVT */		\
+	xor		%ax, %ax;			\
+	mov		%ax, %ds;			\
+							\
+	/* install our int 19 handler */		\
+	movw		$int19_handler, (0x19*4);	\
+	mov		%cs, (0x19*4+2);		\
+							\
+	pop		%ds;				\
+	pop		%eax;				\
+	lret;						\
+							\
+    int19_handler:;					\
+	/* DS = CS */					\
+	movw		%cs, %ax;			\
+	movw		%ax, %ds;
+
+#define OPTION_ROM_END					\
+    .align 512, 0;					\
+    _end:
+
+#define BOOT_ROM_END					\
+	OPTION_ROM_END
+