qemu/lm32 at fca9d723232a8bc756ca74982ee342f73ebf833c - qemu

History

Eduardo Habkost 30b5707c26 qom: Remove module_obj_name parameter from OBJECT_DECLARE* macros One of the goals of having less boilerplate on QOM declarations is to avoid human error. Requiring an extra argument that is never used is an opportunity for mistakes. Remove the unused argument from OBJECT_DECLARE_TYPE and OBJECT_DECLARE_SIMPLE_TYPE. Coccinelle patch used to convert all users of the macros: @@ declarer name OBJECT_DECLARE_TYPE; identifier InstanceType, ClassType, lowercase, UPPERCASE; @@ OBJECT_DECLARE_TYPE(InstanceType, ClassType, - lowercase, UPPERCASE); @@ declarer name OBJECT_DECLARE_SIMPLE_TYPE; identifier InstanceType, lowercase, UPPERCASE; @@ OBJECT_DECLARE_SIMPLE_TYPE(InstanceType, - lowercase, UPPERCASE); Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Acked-by: Cornelia Huck <cohuck@redhat.com> Acked-by: Igor Mammedov <imammedo@redhat.com> Acked-by: Paul Durrant <paul@xen.org> Acked-by: Thomas Huth <thuth@redhat.com> Message-Id: <20200916182519.415636-4-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>		2020-09-18 14:12:32 -04:00
..
cpu-param.h
cpu-qom.h	qom: Remove module_obj_name parameter from OBJECT_DECLARE* macros	2020-09-18 14:12:32 -04:00
cpu.c	cpu: Use DeviceClass reset instead of a special CPUClass reset	2020-03-17 19:48:10 -04:00
cpu.h	gdbstub: extend GByteArray to read register helpers	2020-03-17 17:38:38 +00:00
gdbstub.c	gdbstub: extend GByteArray to read register helpers	2020-03-17 17:38:38 +00:00
helper.c	Clean up inclusion of sysemu/sysemu.h	2019-08-16 13:31:53 +02:00
helper.h
lm32-semi.c
machine.c
meson.build	meson: target	2020-08-21 06:30:35 -04:00
op_helper.c	sysemu: Split sysemu/runstate.h off sysemu/sysemu.h	2019-08-16 13:37:36 +02:00
README
TODO
translate.c	tcg: Search includes from the project root source directory	2020-01-15 15:13:10 -10:00

README

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);