[coreboot-gerrit] Change in coreboot[master]: Makefile: Add is-power-of-two

[Raul Rangel (Code Review)]

Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/40765 )

Change subject: Makefile: Add is-power-of-two
......................................................................

Makefile: Add is-power-of-two

It is sometimes necessary to verify if a CONFIG_ option is a power of
two at build time. This adds a `make` function `is-power-of-two`.

I chose to define all the values because it's the most straightforward
way to do this with `make`.

BUG=b:147042464

Signed-off-by: Raul E Rangel 
Change-Id: I189a4c722996279e2d8940c566cb362f53ef92d8
---
M Makefile.inc
1 file changed, 12 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/65/40765/1

diff --git a/Makefile.inc b/Makefile.inc
index e315732..cbec2dd 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -133,6 +133,7 @@
 # int-gt:         1 if the first values is greater than the second.  0 otherwise
 # int-eq:         1 if the two values are equal.  0 otherwise
 # int-align:      align $1 to $2 units
+# is-power-of-two:1 if value is a power of two
 # file-size:      returns the filesize of the given file
 # tolower:        returns the value in all lowercase
 # toupper:        returns the value in all uppercase
@@ -151,6 +152,15 @@
 int-eq=$(if $(filter 1,$(words $1)),$(strip $1),$(shell expr $(call _toint,$(word 1,$1)) = $(call _toint,$(word 2,$1))))
 int-align=$(shell A=$(call _toint,$1) B=$(call _toint,$2); expr $$A + ( ( $$B - ( $$A % $$B ) ) % $$B ) )
 int-align-down=$(shell A=$(call _toint,$1) B=$(call _toint,$2); expr $$A - ( $$A % $$B ) )
+power-of-twos := 0x00000001 0x00000002 0x00000004 0x00000008 \
+0x00000010 0x00000020 0x00000040 0x00000080 \
+0x00000100 0x00000200 0x00000400 0x00000800 \
+0x00001000 0x00002000 0x00004000 0x00008000 \
+0x00010000 0x00020000 0x00040000 0x00080000 \
+0x00100000 0x00200000 0x00400000 0x00800000 \
+0x01000000 0x02000000 0x04000000 0x08000000 \
+0x10000000 0x20000000 0x40000000 0x80000000
+is-power-of-two=$(if $(filter $(power-of-twos), $(shell printf "0x%08x" $1)),1)
 file-size=$(strip $(shell cat $1 | wc -c))
 tolower=$(shell echo '$1' | tr '[:upper:]' '[:lower:]')
 toupper=$(shell echo '$1' | tr '[:lower:]' '[:upper:]')
@@ -575,6 +585,8 @@
    @printf "    HOSTCC     $(subst $(obj)/,,$(@))\n"
    $(HOSTCC) $(HOSTCFLAGS) -DCONFIG_ROM_SIZE=$(CONFIG_ROM_SIZE) -o $@ $<

+APCB_EDIT_TOOL:=$(top)/util/apcb/apcb_edit.py
+
 CBOOTIMAGE:=$(objutil)/cbootimage/cbootimage

FUTILITY?=$(objutil)/futility/futility