Re: [Qemu-devel] Status of the SH4 / ARM7 emulators

["Andreas Färber" <andreas.faerber@web.de>]

Am 19.11.2011 22:53, schrieb Peter Maydell:
> We also don't support having multiple CPUs with different architectures
> in one emulator: you can have an ARM emulator, or an SH4 emulator,
> but not an emulation of a system with both an ARM and an SH4 core.

Although I have recently been investigating exactly that combo.

* Part of the problem is that common CPUState fields are not at the
start of the struct. I have therefore been playing with a
CPU_COMMON_PREFIX at the start of the struct and using a macro for
clearing on reset, which preserves part of the common prefix fields.
* Given a CPUState*, we need a way to differentiate different CPU types.
I used an enum CPUType cpu_type as first field in CPU_COMMON_PREFIX.
* cpu_mmu_index() is static inline, we should #define it to a non-static
function in helper.c.
* How to get declarations for such target-specific functions when
#include "target-xyz/cpu.h" would overwrite cpu_init, TARGET_PAGE_SIZE
and other defines?

I hope this'll get easier with QOM.

Andreas