Changes

The communication protocol for normal PXI commands is documented below. The size of cmd_buf is calculated from the cmd_hdr. With newer FIRM the total size for command header + buffer must be at most 0x40 words, otherwise Process9 will panic.

The communication protocol for normal PXI commands is documented below. The size of cmd_buf is calculated from the cmd_hdr. With newer FIRM the total size for command header + buffer must be at most 0x40 words, otherwise Process9 will panic.

Each pxi_id corresponds to a Process9 PXI command-handler(called from threads) which handles the actual command processing. With newer FIRM the pxi_id must be in a certain range.

The PXI protocol is bidirectional - both processors can host a PXI service for a given pxi_id. In practice, Process9 hosts all but one of the services (pxi_11 is hosted by pxi-module instead). Each pxi_id corresponds to a PXI command-handler(called from threads) which handles the actual command processing. With newer FIRM the pxi_id must be in a certain range.

There's a dedicated Process9 thread for receiving data from PXI(in newer FIRM this is the main-thread), once it finishes receiving a request it copies the cmd_buf into a buffer for the corresponding pxi_id then signals an event so that the cmd-handler thread can process it. Once a cmd-handler thread finishes processing a command, the thread itself then sends the response over PXI. This means that multiple commands for different pxiIDs can be be handled at the same time, even when one cmd-handler completely hangs/etc for example.

There's a dedicated Process9 thread for receiving data from PXI(in newer FIRM this is the main-thread), once it finishes receiving a request it copies the cmd_buf into a buffer for the corresponding pxi_id then signals an event so that the cmd-handler thread can process it. Once a cmd-handler thread finishes processing a command, the thread itself then sends the response over PXI. This means that multiple commands for different pxiIDs can be be handled at the same time, even when one cmd-handler completely hangs/etc for example.

Process9 will execute [[SVC|svcBreak]] when it receives a PXI command with a pxi_id where another command with that same pxi_id is still being processed by the command-handler(this won't happen with commands sent by the ARM11 PXI-module, since it waits for the command reply before sending another command request for that same pxi_id).

Process9 will execute [[SVC|svcBreak]] when it receives a PXI command with a pxi_id where another command with that same pxi_id is still being processed by the command-handler(this won't happen with commands sent by the ARM11 PXI-module, since it waits for the command reply before sending another command request for that same pxi_id).

==Request==

==Request==