From: "Adnan Khaleel" <adnan@khaleel.us>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Single 64bit memory transaction instead of two 32bit memory transaction.
Date: Mon, 08 Nov 2010 17:27:09 -0600 [thread overview]
Message-ID: <20101108232709.c98bf86f@shadowfax.no-ip.com> (raw)
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In the file exec.c:
The memory Write/Read functions are declared as an array of 4 entries where the index values of 0,1,2 correspond to 8,16 and 32bit write and read functions respectively.
CPUWriteMemoryFunc *io_mem_write[IO_MEM_NB_ENTRIES][4];
CPUReadMemoryFunc *io_mem_read[IO_MEM_NB_ENTRIES][4];
Is there any reason why we can't extend this to include 64bit writes and read by increasing the array size? This is because 64bit reads are currently handled as two separate 32bit reads for eg: sommu_template.h
static inline DATA_TYPE glue(io_read, SUFFIX)(target_phys_addr_t physaddr,
target_ulong addr,
void *retaddr)
{
:
res = io_mem_read[index][2](io_mem_opaque[index], physaddr);
res |= (uint64_t)io_mem_read[index][2](io_mem_opaque[index], physaddr + 4) << 32;
:
return res;
}
I'm sure this is happening in other places as well. Is there a reason for this or could we arbitrarily increase this (within limits ofcourse)?
Thanks
AK
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next reply other threads:[~2010-11-08 23:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-08 23:27 Adnan Khaleel [this message]
2010-11-09 17:57 ` [Qemu-devel] Single 64bit memory transaction instead of two 32bit memory transaction Blue Swirl
2011-09-01 19:16 Adnan Khaleel
2011-09-03 1:53 ` Richard Henderson
2011-09-03 22:36 Adnan Khaleel
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