Changes

PXI Registers (edit)

Revision as of 21:18, 12 December 2015

1,628 bytes removed , 21:18, 12 December 2015

move protocol stuff to PXI Services since it is a FIRM construct

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~~= Protocol =~~

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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.

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

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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.

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Process9 will execute [[SVC|svcBreak]] when it receives a PXI command with a pxi_id where another cmmand 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).

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~~==Request==~~

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~~A11->A9 (u32) pxi_id~~

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~~A11->A9 (u32) cmd_hdr~~

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~~A11->A9 (u32[]) cmd_buf~~

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~~==Response==~~

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~~A9->A11 (u32) pxi_id~~

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~~A9->A11 (u32) cmd_hdr~~

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~~A9->A11 (u32[]) cmd_buf~~

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~~==pxi_id==~~

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~~0 = pxi_mc~~

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~~1 = pxi_fs~~

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~~2 = pxi_fs~~

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~~3 = pxi_fs~~

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~~4 = pxi_fs~~

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~~5 = pxi_pm~~

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~~6 = pxi_dev~~

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~~7 = pxi_am~~

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~~8 = pxi_ps~~

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~~9 = stubbed~~

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= Registers =

{| class="wikitable" border="1"

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| 31

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| ~~R/W~~

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| RW

| PXI_SYNC IRQ enable (for local processor)

|}

Dazzozo

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