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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 = | | = Registers = |
| {| class="wikitable" border="1" | | {| class="wikitable" border="1" |
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| | 0x10008000 | | | 0x10008000 |
| | 4 | | | 4 |
| | | | | Boot9, Process9 |
| |- | | |- |
| | style="background: green" | Yes | | | style="background: green" | Yes |
| | [[#PXI_CNT|PXI_CNT]]9 | | | [[#PXI_CNT|PXI_CNT]]9 |
| | 0x10008004 | | | 0x10008004 |
| | 4 | | | 2 |
| | | | | Boot9, Process9 |
| |- | | |- |
| | style="background: green" | Yes | | | style="background: green" | Yes |
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| | 0x10163000 | | | 0x10163000 |
| | 4 | | | 4 |
| | | | | Boot11 |
| |- | | |- |
| | style="background: green" | Yes | | | style="background: green" | Yes |
| | [[#PXI_CNT|PXI_CNT]]11 | | | [[#PXI_CNT|PXI_CNT]]11 |
| | 0x10163004 | | | 0x10163004 |
| | 4 | | | 2 |
| | | | | Boot11 |
| |- | | |- |
| | style="background: green" | Yes | | | style="background: green" | Yes |
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| | 0-7 | | | 0-7 |
| | R | | | R |
| | Data received from remote | | | Data received from remote bits 8-15 (unrelated to SEND/RECV FIFOs) |
| |- | | |- |
| | 8-15 | | | 8-15 |
| | R/W | | | R/W |
| | Data sent to remote | | | Data sent to remote bits 0-7 |
| |- | | |- |
| | 23 | | | 23 |
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| |- | | |- |
| | 31 | | | 31 |
| | R/W | | | RW |
| | PXI_SYNC IRQ enable (for local processor) | | | PXI_SYNC IRQ enable (for local processor) |
| |} | | |} |