efi/x86: Make efi32_pe_entry() more readable

	.text

	.code32

SYM_FUNC_START(efi32_pe_entry)

/*

 * efi_status_t efi32_pe_entry(efi_handle_t image_handle,

 *			       efi_system_table_32_t *sys_table)

 */

	pushl	%ebp

	movl	%esp, %ebp

	pushl	%eax				// dummy push to allocate loaded_image

	pushl	%ebx

	pushl	%ebx				// save callee-save registers

	pushl	%edi

	call	verify_cpu			// check for long mode support

	popl	%edi

	popl	%ebx

	testl	%eax, %eax

	movl	$0x80000003, %eax		// EFI_UNSUPPORTED

	jnz	3f

	jnz	2f

	call	1f

1:	pop	%ebp

	subl	$1b, %ebp

1:	pop	%ebx

	subl	$1b, %ebx

	/* Get the loaded image protocol pointer from the image handle */

	subl	$12, %esp			// space for the loaded image pointer

	pushl	%esp				// pass its address

	leal	loaded_image_proto(%ebp), %eax

	leal	-4(%ebp), %eax

	pushl	%eax				// &loaded_image

	leal	loaded_image_proto(%ebx), %eax

	pushl	%eax				// pass the GUID address

	pushl	28(%esp)			// pass the image handle

	pushl	8(%ebp)				// pass the image handle

	movl	36(%esp), %eax			// sys_table

	/*

	 * Note the alignment of the stack frame.

	 *   sys_table

	 *   handle             <-- 16-byte aligned on entry by ABI

	 *   return address

	 *   frame pointer

	 *   loaded_image       <-- local variable

	 *   saved %ebx		<-- 16-byte aligned here

	 *   saved %edi

	 *   &loaded_image

	 *   &loaded_image_proto

	 *   handle             <-- 16-byte aligned for call to handle_protocol

	 */

	movl	12(%ebp), %eax			// sys_table

	movl	ST32_boottime(%eax), %eax	// sys_table->boottime

	call	*BS32_handle_protocol(%eax)	// sys_table->boottime->handle_protocol

	cmp	$0, %eax

	addl	$12, %esp			// restore argument space

	testl	%eax, %eax

	jnz	2f

	movl	32(%esp), %ecx			// image_handle

	movl	36(%esp), %edx			// sys_table

	movl	12(%esp), %esi			// loaded_image

	movl	8(%ebp), %ecx			// image_handle

	movl	12(%ebp), %edx			// sys_table

	movl	-4(%ebp), %esi			// loaded_image

	movl	LI32_image_base(%esi), %esi	// loaded_image->image_base

	movl	%ebx, %ebp			// startup_32 for efi32_pe_stub_entry

	jmp	efi32_pe_stub_entry

2:	addl	$24, %esp

3:	popl	%ebp

2:	popl	%edi				// restore callee-save registers

	popl	%ebx

	leave

	ret

SYM_FUNC_END(efi32_pe_entry)