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PSP memory map: WHERE ?

 
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bubugian



Joined: 09 Oct 2008
Posts: 18
PostPosted: Thu Aug 13, 2009 8:33 am    Post subject: PSP memory map: WHERE ? Reply with quote
I'm new with psp programming so please be patient if my questions are banal.

Looking at some samplecode (Fanjita sio's prx in this case) I found following code:

Code:

int intr_handler(void *arg)
{
   sceKernelDisableIntr(PSP_HPREMOTE_INT);
   u32 stat = _lw(0xBE500040);
   _sw(stat, 0xBE500044);
   if(!(_lw(PSP_UART4_STAT) & PSP_UART_RXEMPTY)) {
      fWrite(_lw(PSP_UART4_FIFO));
      sceKernelSetEventFlag(g_eventflag , SIO_CHAR_RECV_EVENT); // set "we got something!!" flag
   }
   sceKernelEnableIntr(PSP_HPREMOTE_INT); // re-enable interrupt
   return -1;
}


I imagine that 0xBE500040 and 0xBE500044 are pointer to uart controller's registers.
I'm asking:
Where I could find a table with psp's memory map ?
Which uart controller is used in psp ?

Thanks all!
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jimparis



Joined: 10 Jun 2005
Posts: 1179
Location: Boston
PostPosted: Thu Aug 13, 2009 10:17 am    Post subject: Reply with quote
You can find some info at http://hitmen.c02.at/files/yapspd/psp_doc/
In general, addresses like this and how they're used are found by reverse-engineering the Sony kernel and binaries to see how they work.
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bubugian



Joined: 09 Oct 2008
Posts: 18
PostPosted: Thu Aug 13, 2009 6:48 pm    Post subject: Reply with quote
jimparis wrote:
You can find some info at http://hitmen.c02.at/files/yapspd/psp_doc/

Thanks, very useful!
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