1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0-or-later
3#
4# Copyright (C) 2017 Imagination Technologies
5# Author: Paul Burton <paul.burton@mips.com>
6#
7# This script merges configuration fragments for boards supported by the
8# generic MIPS kernel. It checks each for requirements specified using
9# formatted comments, and then calls merge_config.sh to merge those
10# fragments which have no unmet requirements.
11#
12# An example of requirements in your board config fragment might be:
13#
14# # require CONFIG_CPU_MIPS32_R2=y
15# # require CONFIG_CPU_LITTLE_ENDIAN=y
16#
17# This would mean that your board is only included in kernels which are
18# configured for little endian MIPS32r2 CPUs, and not for example in kernels
19# configured for 64 bit or big endian systems.
20#
21
22srctree="$1"
23objtree="$2"
24ref_cfg="$3"
25cfg="$4"
26boards_origin="$5"
27shift 5
28
29# Only print Skipping... lines if the user explicitly specified BOARDS=. In the
30# general case it only serves to obscure the useful output about what actually
31# was included.
32case ${boards_origin} in
33"command line")
34	print_skipped=1
35	;;
36environment*)
37	print_skipped=1
38	;;
39*)
40	print_skipped=0
41	;;
42esac
43
44for board in $@; do
45	board_cfg="${srctree}/arch/mips/configs/generic/board-${board}.config"
46	if [ ! -f "${board_cfg}" ]; then
47		echo "WARNING: Board config '${board_cfg}' not found"
48		continue
49	fi
50
51	# For each line beginning with # require, cut out the field following
52	# it & search for that in the reference config file. If the requirement
53	# is not found then the subshell will exit with code 1, and we'll
54	# continue on to the next board.
55	grep -E '^# require ' "${board_cfg}" | \
56	    cut -d' ' -f 3- | \
57	    while read req; do
58		case ${req} in
59		*=y)
60			# If we require something =y then we check that a line
61			# containing it is present in the reference config.
62			grep -Eq "^${req}\$" "${ref_cfg}" && continue
63			;;
64		*=n)
65			# If we require something =n then we just invert that
66			# check, considering the requirement met if there isn't
67			# a line containing the value =y in the reference
68			# config.
69			grep -Eq "^${req/%=n/=y}\$" "${ref_cfg}" || continue
70			;;
71		*)
72			echo "WARNING: Unhandled requirement '${req}'"
73			;;
74		esac
75
76		[ ${print_skipped} -eq 1 ] && echo "Skipping ${board_cfg}"
77		exit 1
78	done || continue
79
80	# Merge this board config fragment into our final config file
81	${srctree}/scripts/kconfig/merge_config.sh \
82		-m -O ${objtree} ${cfg} ${board_cfg} \
83		| grep -Ev '^(#|Using)'
84done
85