in cpu.cc out of the main loop, and into the asynchronous
events handling. I went through all the code paths, and
there doesn't seem to be any reason for that code to be
in the hot loop.
Added another accessor for getting instruction data, called
modC0(). A lot of instructions test whether the mod field
of mod-nnn-rm is 0xc0 or not, ie., it's a register operation
and not memory. So I flag this in fetchdecode{,64}.cc.
This added on the order of 1% performance improvement for
a Win95 boot.
Macroized a few leftover calls to Write_RMV_virtual_xyz()
that didn't get modified in the x86-64 merge. Really, they
just call the real function for now, but I want to have them
available to do direct writes with the guest2host TLB pointers.
but if you hand edit cpu/cpu.h, and change BxICacheEntries,
you can try different sizes. I'll make this more flexible
with configure. For now, use "--enable-icache" with no parameters.
- Modified fetchdecode.cc/fetchdecode64.cc just enough so that
instructions which encode a direct address now use a memory
resolution function which just sticks the immediate address
into rm_addr. With cached instructions we need this.
to bitfields. bxInstruction_c is now 24 bytes, including 4 for
the memory addr resolution function pointer, and 4 for the
execution function pointer (16 + 4 + 4).
Coded more accessors, to abstract access from most code.
with accessors. Had to touch a number of files to update the
access using the new accessors.
Moved rm_addr to the CPU structure, to slim down bxInstruction_c
and to prevent future instruction caching from getting sprayed
with writes to individual rm_addr fields. There only needs to
be one. Though need to deal with instructions which have
static non-modrm addresses, but which are using rm_addr since
that will change.
bxInstruction_c is down to about 40 bytes now. Trying to
get down to 24 bytes.
read all param values from CPU #0. The only solution I can come up with
is to change the siminterface handler function interface to pass a void*
to the callback function. I'll take care of it eventually.
use accessors. This lets me work on compressing the
size of fetch-decode structure (now called bxInstruction_c).
I've reduced it down to about 76 bytes. We should be able
to do much better soon. I needed the abstraction of the
accessors, so I have a lot of freedom to re-arrange things
without making massive future changes.
Lost a few percent of performance in these mods, but my
main focus was to get the abstraction.
no longer used. Also rearranged that struct a little
to be more compressed. Over time, I'm going to reduce
it further, for use with future accelerations.
enhancement to bochs. You can now configure with
--enable-guest2host-tlb.
Force the support of big pages (PSE) when x86-64 is configured.
Reverted back to only one kind of TLB entry style, since everything
is ported.
Fixed one bug in io.cc with as_64 and the index registers.
There are others, as noticed by Peter.
class declaration, for example:
static const unsigned os_64=0, as_64=0;
After reading some suggestions on usenet, I changed these into
enums instead, like this:
enum { os_64=0, as_64=0 };
be used at all, and Peter didn't want it. "extdb.o" is compiled
into libcpu.a, if configured for it.
Removed a few #warnings for x86-64 compile, based on Peter's
line-item comments regarding the warnings I inserted during
the port/merge.
printing a message when a reserved bit was set, but not causing
a #GP(0). As well, I force a new PAE support option to 1 when
Hammer support is enabled.
circular dependencies between 3 cpu related libs that I need
as part of this transition. I changed the "ar rv" to "ld -i -o"
to do an incremental load instead of an archive. Hope this
doesn't break any platforms. We can reset this later.
called cpu_mode. Now there is one for cpu32, but it is declared:
static const unsigned cpu_mode=BX_MODE_IA32;
This way the compiler can compile-out if-then-else clauses based
on it, allowing for easier code sharing.
Bochs debugger. The Bochs debugger calls SIM->debug_get_next_command() which
does not return until a debugger command is found. The siminterface sends an
synchronous event to the wxWindows thread with a blank to be filled in with a
debugger command. wxWindows fills in the blank and sends the synchronous
event back, and the Bochs debugger interprets it as if it was typed on
the command line. For the long term I haven't decided whether to stick with
sending text strings vs. some other method.
- so far the wxWindows debugger consists of one big dialog box that shows
all the standard registers, and a working Continue, Stop, and Step button.
- modify ParamDialog so that it is more useful as a base class, by moving
some things to protected members&fields, separating out functionality
that is most likely to be replaced into virtual functions, and making it
generally more flexible. The new CpuRegistersDialog is based on
ParamDialog.
- in wxdialog.cc, continue the convention of using wxID_HELP, wxID_OK,
wxID_CANCEL, etc. for the id's of buttons, instead of wxHELP, wxOK, etc.
which are intended to be ORred together in a bit field.
- cpu/init.cc: put ifdefs around DEFPARAMs for flags in configurations
where they don't exist. Add an eflags shadow parameter that represents all
of the bits of eflags at once. There are also boolean shadow params for
each bit.
- modified files: cpu/init.cc debug/dbg_main.cc debug/debug.h
gui/siminterface.cc gui/siminterface.h gui/wxdialog.cc gui/wxdialog.h
gui/wxmain.cc gui/wxmain.h
member functions are turned on, BX_CPU_C_PREFIX expands to nothing, and any
method that uses BX_CPU_C_PREFIX instead of explictly writing "BX_CPU_C::"
will not be a member function at all. This makes it impossible for code
outside the BX_CPU_C object to call the accessor because sometimes the method
is at ptr_to_cpu->get_EIP() and other times you'd have to do just get_EIP().
The only way I've found to solve this is to remove the BX_CPU_C_PREFIX
and write BX_CPU_C:: instead.
- in debug/dbg_main.cc I removed the EBP, EIP, ESP, SP shortcuts. Now
the accessors are used everywhere. Also I replaced a reference to
the short-lived get_erx() accessor with ones that work: get_EAX(), etc.
- with these changes the current cvs compiles with any combination of
debugger enabled/disabled, SMP enabled/disabled, and x86-64 enabled/disabled.
BX_READ_8BIT_REG() --> BX_READ_8BIT_REGx()
BX_WRITE_8BIT_REG() --> BX_WRITE_8BIT_REGx()
They use an extra parameter "extended". I coded this
as the macro without the "x" for cpu32 compiles. This
allows for ease of merging and code sharing.
