qemu/target/lm32
Peter Maydell f3b8f18ebf Monitor patches for 2019-08-21
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Merge remote-tracking branch 'remotes/armbru/tags/pull-monitor-2019-08-21' into staging

Monitor patches for 2019-08-21

# gpg: Signature made Wed 21 Aug 2019 16:35:07 BST
# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg:                issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-monitor-2019-08-21:
  monitor/qmp: Update comment for commit 4eaca8de26
  qdev: Collect HMP handlers command handlers in qdev-monitor.c
  qapi: Move query-target from misc.json to machine.json
  hw/core: Move cpu.c, cpu.h from qom/ to hw/core/

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-08-22 10:31:21 +01:00
..
cpu-param.h tcg: Split out target/arch/cpu-param.h 2019-06-10 07:03:34 -07:00
cpu-qom.h hw/core: Move cpu.c, cpu.h from qom/ to hw/core/ 2019-08-21 13:24:01 +02:00
cpu.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
cpu.h migration: Move the VMStateDescription typedef to typedefs.h 2019-08-16 13:31:52 +02:00
gdbstub.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
helper.c Clean up inclusion of sysemu/sysemu.h 2019-08-16 13:31:53 +02:00
helper.h Move target-* CPU file into a target/ folder 2016-12-20 21:52:12 +01:00
lm32-semi.c Move target-* CPU file into a target/ folder 2016-12-20 21:52:12 +01:00
machine.c Include hw/boards.h a bit less 2019-08-16 13:31:53 +02:00
Makefile.objs Move target-* CPU file into a target/ folder 2016-12-20 21:52:12 +01:00
op_helper.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
README Move target-* CPU file into a target/ folder 2016-12-20 21:52:12 +01:00
TODO Move target-* CPU file into a target/ folder 2016-12-20 21:52:12 +01:00
translate.c icount: remove unnecessary gen_io_end calls 2019-08-20 17:26:22 +02:00

LatticeMico32 target
--------------------

General
-------
All opcodes including the JUART CSRs are supported.


JTAG UART
---------
JTAG UART is routed to a serial console device. For the current boards it
is the second one. Ie to enable it in the qemu virtual console window use
the following command line parameters:
  -serial vc -serial vc
This will make serial0 (the lm32_uart) and serial1 (the JTAG UART)
available as virtual consoles.


Semihosting
-----------
Semihosting on this target is supported. Some system calls like read, write
and exit are executed on the host if semihosting is enabled. See
target/lm32-semi.c for all supported system calls. Emulation aware programs
can use this mechanism to shut down the virtual machine and print to the
host console. See the tcg tests for an example.


Special instructions
--------------------
The translation recognizes one special instruction to halt the cpu:
  and r0, r0, r0
On real hardware this instruction is a nop. It is not used by GCC and
should (hopefully) not be used within hand-crafted assembly.
Insert this instruction in your idle loop to reduce the cpu load on the
host.


Ignoring the MSB of the address bus
-----------------------------------
Some SoC ignores the MSB on the address bus. Thus creating a shadow memory
area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
0x80000000-0xffffffff is not cached and used to access IO devices. This
behaviour can be enabled with:
  cpu_lm32_set_phys_msb_ignore(env, 1);