#!/bin/bash
# Usage:
#   source setup_env.sh
#
# Inputs:
#   TOP_DIR: where the .repo of prebuilts reside
#            It is optional. Default is this script's <dir>/ ../..
#   ENABLE_64BIT_BUILD: if we are building 64bit prebuilts
#            It is optional. Default is TRUE.
# Exports:
#   used for kernel or kernel module configs
#
#   CROSS_COMPILER_DIR: where cross compilers are
#   ARCH: arm or arm64
#   CROSS_COMPILE: the prefix of cross compiler
#   LD: the linker to use
#   PATH: new PATH includes the cross compiler
#   CROSS_MAKE: make cmd with essential paramerters to do cross make
#
# Functions
#   GetModulePath:
#     Take <eureka_src_path> and <product> to generate target
#     kernel module path

if [ ! -d "${TOP_DIR}" ]; then
  TOP_DIR="$(readlink -e $(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/../..)"
fi
ENABLE_64BIT_BUILD=${ENABLE_64BIT_BUILD:-"false"}

_toolchain_dir=$(readlink -e ${TOP_DIR}/prebuilt/toolchain)
_num_jobs=$(grep -c processor /proc/cpuinfo)

if [ "${ENABLE_64BIT_BUILD}" = "false" ]; then
  export CROSS_COMPILER_DIR=${_toolchain_dir}/armv7a/bin
  export ARCH=arm
  export CROSS_COMPILE=armv7a-cros-linux-gnueabihf-
  export LD=${CROSS_COMPILE}ld
  export CC=${CROSS_COMPILE}gcc
else
  export CROSS_COMPILER_DIR=${_toolchain_dir}/aarch64/bin
  export ARCH=arm64
  export CROSS_COMPILE=aarch64-cros-linux-gnu-
  export LD=${CROSS_COMPILE}ld.bfd
  export CC=${CROSS_COMPILE}clang
fi

function GetModulePath() {
  local eureka_src_path=$1
  local product=$2

  echo "${eureka_src_path}/vendor/qualcomm/${product}/prebuilt/systemfs_overlay/lib/modules"
}

function GetKernelPath() {
  local eureka_src_path=$1
  local product=$2

  echo ${eureka_src_path}/vendor/qualcomm/${product}/prebuilt/kernel
}

export PATH=${CROSS_COMPILER_DIR}:$PATH
export CROSS_MAKE="make -j${_num_jobs} CC=${CC} LD=${LD}"