Add a generic loader

This work is based on the original work by Li Guang with extra features added by Peter C and myself.

The idea of this loader is to allow the user to load multiple images or values into QEMU at startup.

Memory values can be loaded like this: -device loader,addr=0xfd1a0104,data=0x8000000e,data-len=4

Images can be loaded like this: -device loader,file=./images/u-boot.elf,cpu=0

This can be useful and we use it a lot in Xilinx to load multiple images into a machine at creation (ATF, Kernel and DTB for example).

Tested with the latest Xilinx ZynqMP machine, if I enable EL3 and EL2 I can boot ATF through to u-boot using the loader to load the images.

It can also be used to set registers.

This patch series makes the load_elf() function more generic by not requiring an architecture. It also adds new functions load_elf_as(), load_uimage_as and load_image_targphys_as which allows custom AddressSpaces when loading images.

V12:
- All patches have been reviewed
- Most patches have been merged
- The commit message of the actual device patch has been updated to justify why it is a device.

Alistair Francis (2):
generic-loader: Add a generic loader
docs: Add a generic loader explanation document

 MAINTAINERS                      |   6 ++
 docs/generic-loader.txt          |  84 ++++++++++++++++
 hw/core/Makefile.objs            |   2 +
 hw/core/generic-loader.c         | 211 +++++++++++++++++++++++++++++++++++++++
 include/hw/core/generic-loader.h |  46 +++++++++
 5 files changed, 349 insertions(+)
 create mode 100644 docs/generic-loader.txt
 create mode 100644 hw/core/generic-loader.c
 create mode 100644 include/hw/core/generic-loader.h

2.7.4