# kernel.SlackBuild helper 'source/k/platform/aarch64/fw-amdgpu'
# <mozes@slackware.com>
# 16-May-2024
#
# Note: This script is executed when the shell's working directory
#       is set to the root of the OS InitRD.
#
# Add AMD GPU firmware for known/tested AMD GPU's.
#
# AMD GPU hardware: AMD RX550 4GB GPU
# Used by Hardware Models: Honey Comb LX2.
#
# This adds just >500K to the OS InitRD.

# Reference method to determine which firmware is required:
# https://wiki.gentoo.org/wiki/AMDGPU#Firmware_blobs_for_a_known_card_model

# We're masking this out since we don't need to include the firmware within
# the OS InitRD in order for basic video (just enough to see the system boot)
# to function.
#
# This code remains here for future implementation reference.

function branch_past_amdgpu() {
# Extract the AMD GPU firmware from the Slackware a/kernel-firmware package
# into a temporary location:
echo "Adding AMD GPU firmware into $PWD"
mkdir -p $TMPBUILD/fw-amdgpu-extract
tar -C $TMPBUILD/fw-amdgpu-extract/ -xf $PKGSTORE/a/kernel-firmware-*.t?z lib/firmware/amdgpu/

# Extract the package installation script so we can grab the symlinks:
tar -C $TMPBUILD/fw-amdgpu-extract/ -xf $PKGSTORE/a/kernel-firmware-*.t?z install/doinst.sh
pushd $TMPBUILD/fw-amdgpu-extract/
# Expect errors from here since we are trying to make symlinks in directories that
# we haven't extracted/created:
( grep -E '^\( cd .*(rm|ln)' install/doinst.sh | bash ) 2>/dev/null
popd

# Move the required firmware into the OS InitRD's root directory along with
# the rest of the packaged firmware:
pushd $TMPBUILD/fw-amdgpu-extract/lib/firmware/amdgpu
# Create the directory within the OS InitRD to hold it:
mkdir -vpm755 $TMPBUILD/initrd-tree/lib/firmware/amdgpu
# We copy the symlinks and their targets:
mv -fv \
   polaris10_{sdma,sdma1,uvd,vce}.bin \
   polaris12_{ce,ce_2,k_mc,k_smc,mc,me,me_2,mec,mec2,mec2_2,mec_2,pfp,pfp_2,rlc,sdma,sdma1,smc,uvd,vce}.bin \
   $TMPBUILD/initrd-tree/lib/firmware/amdgpu/
popd

# Compress the firmware:
xz -vze9 $TMPBUILD/initrd-tree/lib/firmware/amdgpu/*
# Fix any broken symlinks caused by the compression process:
pushd $TMPBUILD/initrd-tree/lib/firmware/amdgpu
( find . -type l -not -name '*.xz' -printf "rm -f %P ; ln -s %l.xz %p.xz\n" ) | /bin/bash
popd

}