syscon: get the git hash and dirty flag in build time

Signed-off-by: Dan Horák <dan@danny.cz>

.gitignore

@@ -14,3 +14,4 @@ tests/*/*.elf
 TAGS
 litedram/build/*
 obj_dir/*
+git.vhdl

Makefile

@@ -50,6 +50,9 @@ core_files = decode_types.vhdl common.vhdl wishbone_types.vhdl fetch1.vhdl \
 	loadstore1.vhdl mmu.vhdl dcache.vhdl writeback.vhdl core_debug.vhdl \
 	core.vhdl
 
+git.vhdl: git.vhdl.in
+	./make_version.sh $@
+
 soc_files = $(core_files) wishbone_arbiter.vhdl wishbone_bram_wrapper.vhdl sync_fifo.vhdl \
 	wishbone_debug_master.vhdl xics.vhdl syscon.vhdl soc.vhdl \
 	spi_rxtx.vhdl spi_flash_ctrl.vhdl git.vhdl
@@ -272,5 +275,5 @@ distclean: _clean
 	make -f scripts/mw_debug/Makefile distclean
 	make -f hello_world/Makefile distclean
 
-.PHONY: all prog check check_light clean distclean
+.PHONY: all prog check check_light clean distclean git.vhdl
 .PRECIOUS: microwatt.json microwatt_out.config microwatt.bit

git.vhdl

@@ -1,9 +0,0 @@
-library ieee;
-use ieee.std_logic_1164.all;
-
-library work;
-
-package git is
-    constant GIT_HASH : std_ulogic_vector(27 downto 0) := x"1234567";
-    constant GIT_DIRTY : std_ulogic := '0';
-end git;

git.vhdl.in

@@ -0,0 +1,9 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+library work;
+
+package git is
+    constant GIT_HASH : std_ulogic_vector(27 downto 0) := x"@hash@";
+    constant GIT_DIRTY : std_ulogic := '@dirty@';
+end git;

make_version.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+dirty="0"
+
+usage() {
+	echo "$0 <file>"
+	echo -e "\tSubstitute @hash@ and @dirty@ in <file> with gathered values."
+}
+
+if [ "$1" = "-h" -o "$1" = "--help" ] ;
+then
+	usage
+	exit 1;
+fi
+if [ -z $1 ] ;
+then
+	usage
+	exit 1;
+fi
+
+src=$1
+
+if test -e .git || git rev-parse --is-inside-work-tree > /dev/null 2>&1;
+then
+	version=$(git describe --exact-match 2>/dev/null)
+	if [ -z "$version" ];
+	then
+		version=$(git describe 2>/dev/null)
+	fi
+	if [ -z "$version" ];
+	then
+		version=$(git rev-parse --verify --short HEAD 2>/dev/null)
+	fi
+	if git diff-index --name-only HEAD |grep -qv '.git';
+	then
+		dirty="1"
+	fi
+	echo "hash=$version dirty=$dirty"
+	sed -e "s/@hash@/$version/" -e "s/@dirty@/$dirty/" ${src}.in > ${src}
+fi