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40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
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# The OS/K Team licenses this file to you under the MIT license.
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# See the LICENSE file in the project root for more information.
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To communicate with devices, use:
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devctl #dev #slot
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iocall #dev #slot
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This will call a function from the device's slot table.
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It will take registers ax0-ax7 as its parameters, and
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return a value in rdx:rax.
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The return value in rax is a status value:
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≥0 ok (>0 only if meaningful)
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-1 unspecified error
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-2 no such device
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-3 device powered off
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-4 device fatal error
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-5 device not plugged
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-6 no such function slot
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-7 slot not implemented
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-8 slot reserved
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-9 invalid parameters
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-10 to -256 (reserved)
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< -256 (left to device)
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The slots for "devctl" are architecture-rerserved.
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They consist of the following functions:
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Slot Param (ax0) Description
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0 ptr Write device type into buffer
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1 ptr Write device name into buffer
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2 ptr Write device model into buffer
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3 ptr Write device vendor into buffer
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4 rax=major, rdx=minor
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5 rax=feats, rdx=revis
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6-31 (reserved)
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The slots for "iocall" are device-defined. (They correspond
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to the "fslots" array of the dev_t structure.) See that
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particular device's documentation (if any).
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