Initial import of qemu-2.4.1HEADmaster

1 files changed, 236 insertions, 0 deletions

diff --git a/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S b/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S
new file mode 100644
index 00000000..259bc6ba
--- /dev/null
+++ b/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S
@@ -0,0 +1,236 @@
+FILE_LICENCE ( GPL_ANY )
+
+#define BZI_LOAD_HIGH_ADDR 0x100000
+
+	.text
+	.arch i386
+	.code16
+	.section ".prefix", "ax", @progbits
+	.globl	_lkrn_start
+_lkrn_start:
+
+/*****************************************************************************
+ *
+ * Kernel header
+ *
+ * We place our prefix (i.e. our .prefix and .text16.early sections)
+ * within the bzImage real-mode portion which gets loaded at
+ * 1000:0000, and our payload (i.e. everything else) within the
+ * bzImage protected-mode portion which gets loaded at 0x100000
+ * upwards.
+ *
+ */
+
+	.org	0x1f1
+setup_sects:
+	.byte	-1 /* Allow for initial "boot sector" */
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
+	.ascii	"ADHL"
+	.long	setup_sects
+	.long	512
+	.long	0
+	.previous
+root_flags:
+	.word	0
+syssize:
+	.long	0
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
+	.ascii	"ADPL"
+	.long	syssize
+	.long	16
+	.long	0
+	.previous
+ram_size:
+	.word	0
+vid_mode:
+	.word	0
+root_dev:
+	.word	0
+boot_flag:
+	.word	0xaa55
+jump:
+	/* Manually specify a two-byte jmp instruction here rather
+	 * than leaving it up to the assembler.
+	 */
+	.byte	0xeb, ( setup - header )
+header:
+	.byte	'H', 'd', 'r', 'S'
+version:
+	.word	0x0207 /* 2.07 */
+realmode_swtch:
+	.long	0
+start_sys:
+	.word	0
+kernel_version:
+	.word	version_string - 0x200
+type_of_loader:
+	.byte	0
+loadflags:
+	.byte	0x01 /* LOADED_HIGH */
+setup_move_size:
+	.word	0
+code32_start:
+	.long	0
+ramdisk_image:
+	.long	0
+ramdisk_size:
+	.long	0
+bootsect_kludge:
+	.long	0
+heap_end_ptr:
+	.word	0
+ext_loader_ver:
+	.byte	0
+ext_loader_type:
+	.byte	0
+cmd_line_ptr:
+	.long	0
+initrd_addr_max:
+	.long	0xffffffff
+kernel_alignment:
+	.long	0
+relocatable_kernel:
+	.byte	0
+min_alignment:
+	.byte	0
+xloadflags:
+	.word	0
+cmdline_size:
+	.long	0x7ff
+hardware_subarch:
+	.long	0
+hardware_subarch_data:
+	.byte	0, 0, 0, 0, 0, 0, 0, 0
+
+version_string:
+	.asciz	VERSION
+
+/*****************************************************************************
+ *
+ * Setup code
+ *
+ */
+
+setup:
+	/* Fix up code segment */
+	pushw	%ds
+	pushw	$1f
+	lret
+1:
+	/* Set up stack just below 0x7c00 and clear direction flag */
+	xorw	%ax, %ax
+	movw	%ax, %ss
+	movw	$0x7c00, %sp
+	cld
+
+	/* Retrieve command-line pointer */
+	movl	cmd_line_ptr, %edx
+	testl	%edx, %edx
+	jz	no_cmd_line
+
+	/* Set up %es:%di to point to command line */
+	movl	%edx, %edi
+	andl	$0xf, %edi
+	rorl	$4, %edx
+	movw	%dx, %es
+
+	/* Find length of command line */
+	pushw	%di
+	movw	$0xffff, %cx
+	repnz scasb
+	notw	%cx
+	popw	%si
+
+	/* Make space for command line on stack */
+	movw	%sp, %di
+	subw	%cx, %di
+	andw	$~0xf, %di
+	movw	%di, %sp
+
+	/* Copy command line to stack */
+	pushw	%ds
+	pushw	%es
+	popw	%ds
+	pushw	%ss
+	popw	%es
+	rep movsb
+	popw	%ds
+
+	/* Store new command-line pointer */
+	movzwl	%sp, %edx
+no_cmd_line:
+
+	/* Calculate maximum relocation address */
+	movl	ramdisk_image, %ebp
+	testl	%ebp, %ebp
+	jnz	1f
+	orl	$0xffffffff, %ebp /* Allow arbitrary relocation if no initrd */
+1:
+	/* Install iPXE */
+	call	alloc_basemem
+	xorl	%esi, %esi
+	xorl	%edi, %edi
+	call	install_prealloc
+
+	/* Set up real-mode stack */
+	movw	%bx, %ss
+	movw	$_estack16, %sp
+
+	/* Jump to .text16 segment */
+	pushw	%ax
+	pushw	$1f
+	lret
+	.section ".text16", "awx", @progbits
+1:
+	/* Retrieve initrd pointer and size */
+	movl	ramdisk_image, %ebp
+	movl	ramdisk_size, %ecx
+
+	/* Set up %ds for access to .data16 */
+	movw	%bx, %ds
+
+	/* Store command-line pointer */
+	movl	%edx, cmdline_phys
+
+	/* Store initrd pointer and size */
+	movl	%ebp, initrd_phys
+	movl	%ecx, initrd_len
+
+	/* Run iPXE */
+	pushl	$main
+	pushw	%cs
+	call	prot_call
+	popl	%ecx /* discard */
+
+	/* Uninstall iPXE */
+	call	uninstall
+
+	/* Boot next device */
+	int $0x18
+
+/*****************************************************************************
+ *
+ * Open payload (called by libprefix)
+ *
+ * Parameters:
+ *   %ds:0000 : Prefix
+ *   %esi : Buffer for copy of image source (or zero if no buffer available)
+ *   %ecx : Expected offset within buffer of first payload block
+ * Returns:
+ *   %esi : Valid image source address (buffered or unbuffered)
+ *   %ecx : Actual offset within buffer of first payload block
+ *   CF set on error
+ */
+
+	.section ".text16.early", "awx", @progbits
+	.globl	open_payload
+open_payload:
+
+	/* Our payload will always end up at BZI_LOAD_HIGH_ADDR */
+	movl	$BZI_LOAD_HIGH_ADDR, %esi
+	xorl	%ecx, %ecx
+	lret
+
+	/* Payload must be aligned to a whole number of setup sectors */
+	.globl	_payload_align
+	.equ	_payload_align, 512