qemu-e2k

History

Markus Armbruster da34e65cb4 include/qemu/osdep.h: Don't include qapi/error.h Commit `57cb38b` included qapi/error.h into qemu/osdep.h to get the Error typedef. Since then, we've moved to include qemu/osdep.h everywhere. Its file comment explains: "To avoid getting into possible circular include dependencies, this file should not include any other QEMU headers, with the exceptions of config-host.h, compiler.h, os-posix.h and os-win32.h, all of which are doing a similar job to this file and are under similar constraints." qapi/error.h doesn't do a similar job, and it doesn't adhere to similar constraints: it includes qapi-types.h. That's in excess of 100KiB of crap most .c files don't actually need. Add the typedef to qemu/typedefs.h, and include that instead of qapi/error.h. Include qapi/error.h in .c files that need it and don't get it now. Include qapi-types.h in qom/object.h for uint16List. Update scripts/clean-includes accordingly. Update it further to match reality: replace config.h by config-target.h, add sysemu/os-posix.h, sysemu/os-win32.h. Update the list of includes in the qemu/osdep.h comment quoted above similarly. This reduces the number of objects depending on qapi/error.h from "all of them" to less than a third. Unfortunately, the number depending on qapi-types.h shrinks only a little. More work is needed for that one. Signed-off-by: Markus Armbruster <armbru@redhat.com> [Fix compilation without the spice devel packages. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2016-03-22 22:20:15 +01:00
..
cpu-qom.h	target-lm32: Use cpu_exec_interrupt qom hook	2014-09-25 18:54:22 +01:00
cpu.c	include/qemu/osdep.h: Don't include qapi/error.h	2016-03-22 22:20:15 +01:00
cpu.h	all: Clean up includes	2016-02-23 12:43:05 +00:00
gdbstub.c	lm32: Clean up includes	2016-01-29 15:07:22 +00:00
helper.c	log: do not unnecessarily include qom/cpu.h	2016-02-03 09:19:10 +00:00
helper.h	tcg: Invert the inclusion of helper.h	2014-05-28 09:33:54 -07:00
lm32-semi.c	lm32: Clean up includes	2016-01-29 15:07:22 +00:00
machine.c	lm32: Clean up includes	2016-01-29 15:07:22 +00:00
Makefile.objs
op_helper.c	lm32: Clean up includes	2016-01-29 15:07:22 +00:00
README
TODO
translate.c	tcg: Add type for vCPU pointers	2016-03-01 13:27:09 +00:00

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);