Questions about changing physical address width

Hi,
 
 
 
We want to change Bochs’ physical address width to 46bit.
 
Could you give us any comments about how to do?
 
 
 
Basically, we will change below macro in config.h to 46,
 
 
 
#if BX_CPU_LEVEL == 5
 
  #define BX_PHY_ADDRESS_WIDTH 36
 
#else
 
  #define BX_PHY_ADDRESS_WIDTH 40
 
#endif
 
 
 
 
 
But we also notice code in paging.cc like below
 
 
 
const Bit32u PAGING_PDE4M_RESERVED_BITS = ((1 << (41-BX_PHY_ADDRESS_WIDTH))-1) << (13 + BX_PHY_ADDRESS_WIDTH - 32);
 
 
 
If we change BX_PHY_ADDRESS_WIDTH equal 46,  (41-BX_PHY_ADDRESS_WIDTH) will be minus. 
 
What do you think about this?
 
 
 
 
 
Best regards,
 
--- Cliff

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