Hi,

On 12/28/2014 01:40 PM, Franc sylvester wrote:

Hi all,

I have two query to understand Genode basics.

I am not able to understand the explanation given for Bitfield at line #140 in repos/base/include/util/register.h

" Bitfields are read and written according to their range, so if we have a 'Bitfield<2,3>' and write '0b11101' to it only '0b101' (shiftet by 2 bits) is written."

can any body explain me what it means for ?

The Bitfield template has two template parameters: bit offset regarding the position within the related register, and the bitfield's size in bits. The example in the above cited comment represents bits 2, 3, and 4 of the corresponding register. The comment is trying to explain that a value greater than the bitfield's size gets truncated to these 3 bits without further warnings.

Stefan and Martin,

I was trying to understand implemented TZASC driver in Genode for vea9x4 board.

can you suggest me some sources which have information used in repos/os/src/server/tz_vmm/vea9x4/tsc_380.h

Here is the reference manual from ARM:

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0431c/DDI0431C_tzasc_tzc...

It is the only source used to implement the device driver mentioned above. Of course the memory map of the Versatile Express Motherboard and the Coretile Cortex A9x4 daughterboard is relevant too:

http://infocenter.arm.com/help/topic/com.arm.doc.dui0447j/DUI0447J_v2m_p1_tr...

http://infocenter.arm.com/help/topic/com.arm.doc.dui0448h/DUI0448H_v2p_ca9_t...

Regards Stefan

Regards Franc

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