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Add a new internal API called uthread (Kconfig symbol: UTHREAD) which provides cooperative multi-tasking. The goal is to be able to improve the performance of some parts of U-Boot by overlapping lengthy operations, and also implement background jobs in the U-Boot shell. Each uthread has its own stack allocated on the heap. The default stack size is defined by the UTHREAD_STACK_SIZE symbol and is used when uthread_create() receives zero for the stack_sz argument. The implementation is based on context-switching via initjmp()/setjmp()/ longjmp() and is inspired from barebox threads [1]. A notion of thread group helps with dependencies, such as when a thread needs to block until a number of other threads have returned. The name "uthread" comes from "user-space threads" because the scheduling happens with no help from a higher privileged mode, contrary to more complex models where kernel threads are defined. But the 'u' may as well stand for 'U-Boot' since the bootloader may actually be running at any privilege level and the notion of user vs. kernel may not make much sense in this context. [1] https://github.com/barebox/barebox/blob/master/common/bthread.c Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This patch series adds support for ZFS listing and load to u-boot. To Enable zfs ls and load commands, modify the board specific config file with #define CONFIG_CMD_ZFS Steps to test: 1. After applying the patch, zfs specific commands can be seen in the boot loader prompt using UBOOT #help zfsload- load binary file from a ZFS file system zfsls - list files in a directory (default /) 2. To list the files in zfs pool, device or partition, execute zfsls <interface> <dev[:part]> [POOL/@/dir/file] For example: UBOOT #zfsls mmc 0:5 /rpool/@/usr/bin/ 3. To read and load a file from an ZFS formatted partition to RAM, execute zfsload <interface> <dev[:part]> [addr] [filename] [bytes] For example: UBOOT #zfsload mmc 2:2 0x30007fc0 /rpool/@/boot/uImage References : -- ZFS GRUB sources from Solaris GRUB-0.97 -- GRUB Bazaar repository Jorgen Lundman <lundman at lundman.net> 2012.