mirror of
https://github.com/lxsang/meta-rpi-diya.git
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166 lines
3.7 KiB
Bash
Executable File
166 lines
3.7 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (C) 2011 O.S. Systems Software LTDA.
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# Licensed on MIT
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#
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# Provides the API to be used by the initramfs modules
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#
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# Modules need to provide the following functions:
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#
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# <module>_enabled : check if the module ought to run (return 1 to skip)
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# <module>_run : do what is need
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#
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# Boot parameters are available on environment in the as:
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#
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# 'foo=value' as 'bootparam_foo=value'
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# 'foo' as 'bootparam_foo=true'
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# 'foo.bar[=value] as 'foo_bar=[value|true]'
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# Register a function to be called before running a module
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# The hook is called as:
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# <function> pre <module>
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add_module_pre_hook() {
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MODULE_PRE_HOOKS="$MODULE_PRE_HOOKS $1"
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}
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# Register a function to be called after running a module
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# The hook is called as:
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# <function> post <module>
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add_module_post_hook() {
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MODULE_POST_HOOKS="$MODULE_POST_HOOKS $1"
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}
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# Load kernel module
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load_kernel_module() {
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if modprobe $1 >/dev/null 2>&1; then
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info "Loaded module $1"
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else
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debug "Failed to load module $1"
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fi
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}
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# Prints information
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msg() {
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echo "$@" >/dev/console
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}
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# Prints information if verbose bootparam is used
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info() {
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[ -n "$bootparam_verbose" ] && echo "$@" >/dev/console
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}
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# Prints information if debug bootparam is used
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debug() {
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[ -n "$bootparam_debug" ] && echo "DEBUG: $@" >/dev/console
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}
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# Prints a message and start a endless loop
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fatal() {
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echo $1 >/dev/console
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echo >/dev/console
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if [ -n "$bootparam_init_fatal_sh" ]; then
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sh
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else
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while [ "true" ]; do
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sleep 3600
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done
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fi
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}
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# Variables shared amoung modules
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MODULE_PRE_HOOKS="" # functions to call before running each module
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MODULE_POST_HOOKS="" # functions to call after running each module
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MODULES_DIR=/init.d # place to look for modules
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EFI_DIR=/sys/firmware/efi # place to store device firmware information
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# make mount stop complaining about missing /etc/fstab
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touch /etc/fstab
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# initialize /proc, /sys, /run/lock and /var/lock
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mkdir -p /proc /sys /run/lock /var/lock
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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if [ -d $EFI_DIR ];then
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mount -t efivarfs none /sys/firmware/efi/efivars
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fi
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# populate bootparam environment
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for p in `cat /proc/cmdline`; do
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if [ -n "$quoted" ]; then
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value="$value $p"
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if [ "`echo $p | sed -e 's/\"$//'`" != "$p" ]; then
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eval "bootparam_${quoted}=${value}"
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unset quoted
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fi
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continue
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fi
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opt=`echo $p | cut -d'=' -f1`
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opt=`echo $opt | sed -e 'y/.-/__/'`
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if [ "`echo $p | cut -d'=' -f1`" = "$p" ]; then
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eval "bootparam_${opt}=true"
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else
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value="`echo $p | cut -d'=' -f2-`"
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if [ "`echo $value | sed -e 's/^\"//'`" != "$value" ]; then
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quoted=${opt}
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continue
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fi
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eval "bootparam_${opt}=\"${value}\""
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fi
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done
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# use /dev with devtmpfs
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if grep -q devtmpfs /proc/filesystems; then
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mkdir -p /dev
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mount -t devtmpfs devtmpfs /dev
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else
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if [ ! -d /dev ]; then
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fatal "ERROR: /dev doesn't exist and kernel doesn't has devtmpfs enabled."
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fi
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fi
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# active the back light
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echo 0 > /sys/class/backlight/backlight/bl_power
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# Load and run modules
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for m in $MODULES_DIR/*; do
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# Skip backup files
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if [ "`echo $m | sed -e 's/\~$//'`" != "$m" ]; then
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continue
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fi
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module=`basename $m | cut -d'-' -f 2`
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debug "Loading module $module"
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# pre hooks
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for h in $MODULE_PRE_HOOKS; do
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debug "Calling module hook (pre): $h"
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eval "$h pre $module"
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debug "Finished module hook (pre): $h"
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done
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# process module
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. $m
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if ! eval "${module}_enabled"; then
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debug "Skipping module $module"
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continue
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fi
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debug "Running ${module}_run"
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eval "${module}_run"
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# post hooks
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for h in $MODULE_POST_HOOKS; do
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debug "Calling module hook (post): $h"
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eval "$h post $module"
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debug "Finished module hook (post): $h"
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done
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done
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exec /sbin/init
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# Catch all
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fatal "ERROR: Initramfs failed to initialize the system."
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