===============
Rairii changes:
memctrlbase: The memory controller may have an endian swap mode.
mpc106: Only mmio regions need endian swap and only if PCIR_LE_MODE is
set.
videoctrl: Add framebuffer_in_main_memory flag. Use needs_swap_endian.
debugger: Fix disasm for little endian mode.
ppcmmu: little endian mode requires munging of the data and instruction
addresses, affecting the 3 least significant bits.
ppcexec: pc_real is always recalculated during little endian mode
because instructions are swapped every 8 bytes (due to the address
munging).
==============
joevt changes:
Add SUPPORTS_MEMORY_CTRL_ENDIAN_MODE for memory controller.
Use cmake -DDPPC_SUPPORT_PPC_LE=ON to enable.
Add SUPPORTS_PPC_LITTLE_ENDIAN_MODE for CPU.
Use cmake -DDPPC_SUPPORT_MEM_LE=ON to enable.
Add ppc_change_endian to handle endian switch for MPC601 (uses HID0
instead of MSR) and later PPC CPUs.
Add is_LE flag to ppc_state to indicate little endian mode for all
processor versions.
Create separate ppc_exec_inner template functions for little and big
endian.
Switch endian mode in the ppc_exec outer functions when power_off_reason
is po_endian_switch.
Since MPC601 doesn't have ILE and LE bits, remove that code for that
CPU.
videoctrl: Uses templated methods. See next commit for a fix that this
change introduces.
If a DMA range extends beyond the end of a region into a second region of the same type (either RAM or ROM), and the regions are adjacent in both the guest and host address spaces, then allow the DMA to proceed.
Replace it wth an explicit opcode parameter that is passed around. That
is both slightly easier to reason about (to trace where it comes from)
and slightly faster, since it can be read from a register.
On my machine takes booting to "Welcome to Macintosh" being output in
a verbose boot of Mac OS X 10.2.8 from 31.8s to 30.6s (average of 5
runs, measured using deterministic mode and looking at when execution
reaches PC 0x90004a88).
Mode 1 contains real addressing mode entries, which by definition cannot
be using segment registers. By skipping over them, we can shave off a
couple of seconds from the 10.2 boot time.
cur_dma_rgn->end is the last byte of a region. It is not the byte after the region. Therefore, subtract 1 from size before doing compare.
Also add more detail to the abort messages.
I don't know if the compiler is smart enough to figure out that ((guest_va & 0xFFF) + sizeof(T)) > 0x1000) is always false when sizeof(T) == 1 so we'll add a check for sizeof(T) > 1.
The TLBEntries allow converting virtual guest address to virtual host address but there's no easy way to get a guest physical address for debugging purposes.
Add a phys_tag field to fix that.
Maxim Poliakovski
joevt
Rairii
dingusdev
Mihai Parparita