1# SPDX-License-Identifier: GPL-2.0+
2# Copyright (c) 2016 Google, Inc
3# Written by Simon Glass <sjg@chromium.org>
4#
5# Entry-type module for the 16-bit x86 start-up code for U-Boot
6#
7
8from entry import Entry
9from blob import Entry_blob
10
11class Entry_x86_start16(Entry_blob):
12    """x86 16-bit start-up code for U-Boot
13
14    Properties / Entry arguments:
15        - filename: Filename of u-boot-x86-16bit.bin (default
16            'u-boot-x86-16bit.bin')
17
18    x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
19    must be placed at a particular address. This entry holds that code. It is
20    typically placed at offset CONFIG_SYS_X86_START16. The code is responsible
21    for changing to 32-bit mode and jumping to U-Boot's entry point, which
22    requires 32-bit mode (for 32-bit U-Boot).
23
24    For 64-bit U-Boot, the 'x86_start16_spl' entry type is used instead.
25    """
26    def __init__(self, section, etype, node):
27        Entry_blob.__init__(self, section, etype, node)
28
29    def GetDefaultFilename(self):
30        return 'u-boot-x86-16bit.bin'
31