24 Apr
2016
24 Apr
'16
noon
If you post a few lines of code, someone might spot
the problem. I assume
you are getting SS$_ACCVIO as return?
So either return_va_64 or return_length_64 wasn't passed by reference (or
wasn't long enough but you'd have to be really lucky to pass in a 32-bit
value
that sat at the very end of a page ...)
Thanks. I have since managed to find the problem with that. But I do have a
problem that with a successful creation of the section I don't seem to be
accessing the right location. This is the code now:
long long int startPhysicalAddress = 0x100000000;
long long int endPhysicalAddress = 0x100100000;
long long int regionId;
__align (quadword) void *address;
__align(quadword) long long int length;
unsigned int pfn = startPhysicalAddress >> PAGE_SIZE;
unsigned int pagesToMap = ((endPhysicalAddress -
startPhysicalAddress) >> PAGE_SIZE) + 1;
unsigned int flags = SEC$M_EXPREG | SEC$M_PFNMAP | SEC$M_WRT;
int status;
regionId = VA$C_P2;
status = sys$crmpsc_pfn_64(®ionId, pfn, pagesToMap, PSL$C_USER,
flags, &address, &length, 0);
PrintStatus(status);
flashbusIndexRegister = (unsigned int *)address;
flashbusDataRegister = (unsigned int *)((char *)address +
(endPhysicalAddress - startPhysicalAddress));
If I try to write to the index register by dereferencing
flashbusIndexRegister the machine dies.
Regards
Rob