[Xen-devel] Mini-OS on ARM64

[Chen Baozi <cbz@xxxxxxxxxx>]

Hi all,

With plenty of ugly hacks, mini-os is now able to boot on my arm64 board:

(d37) - Mini-OS booting -
(d37) - Setup CPU -
(d37) - Setup booting pagetable -
(d37) - MMU on -
(d37) - Setup stack -
(d37) - Jumping to C entry -
(d37) Checking DTB at ffffffbffffff000...
(d37) map_console, phys = 0x39000000
(d37) Console is on port 2
(d37) Console ring is at mfn ffffffbfffc00000
(d37) MM: Init
(d37)     _text: ffffffc000000000(VA)
(d37)     _etext: ffffffc00000f120(VA)
(d37)     _erodata: ffffffc000011000(VA)
(d37)     _edata: ffffffc00001c31c(VA)
(d37)     stack start: ffffffc000018000(VA)
(d37)     _end: ffffffc000025788(VA)
(d37) Found memory at 0x40000000 (len 0x8000000)
(d37) Using pages 262182 to 294912 as free space for heap.
(d37) MM: Initialise page allocator for 
ffffffc000026000(40026000)-ffffffc008000000(48000000)
(d37) MM: done
(d37) Found GIC: gicd_base = ffffffbfffa01000, gicc_base = ffffffbfffa02000
(d37) Initialising timer interface
(d37) Virtual Count register is 22aba5, freq = 50000000 Hz
(d37) Initialising console ... done.
(d37) FDT suggests grant table base 38000000
(d37) gnttab_table mapped at ffffffbff8000000.
(d37) Initialising scheduler
(d37) Thread "Idle": pointer: 0xffffffc00002f070, stack: 0xffffffc000030000
(d37) Thread "xenstore": pointer: 0xffffffc00002f0d0, stack: 0xffffffc000040000
(d37) xenbus initialised on irq 1 mfn 0x39001
(d37) Thread "shutdown": pointer: 0xffffffc00002f130, stack: 0xffffffc000050000
(d37) Test main: start_info=ffffffc000025298
(d37) Thread "xenbus_tester": pointer: 0xffffffc00002f190, stack: 
0xffffffc000060000
(d37) Thread "periodic_thread": pointer: 0xffffffc00002f1f0, stack: 
0xffffffc000070000
(d37) Thread "shutdown": pointer: 0xffffffc00002f250, stack: 0xffffffc000080000

However, it is still at very early stage (means unfinished features, lots of
bugs and termporary hacks). There is still a lot of work needed before it can
be merged. So I just put the codes on the github in case anyone would like
to have a try. I'll continue to work on it until it can be sent as patches.

Any comment is welcome.

Some info you might need:

* Github url:
  https://github.com/baozich/mini-os
* Command that I use to build:
  CONFIG_TEST=y CONFIG_START_NETWORK=n CONFIG_BLKFRONT=n CONFIG_NETFRONT=n \
  CONFIG_FBFRONT=n CONFIG_KBDFRONT=n CONFIG_CONSFRONT=n CONFIG_XC=n \
  MINIOS_TARGET_ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make
* XL config:
  name = "mini-os"
  vcpus = 1
  memory = 128
  gic_version = "v2"
  kernel = "/path/to/mini-os.img"

Cheers,

Baozi.

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