forked from AbleOS/ableos
58 lines
1.6 KiB
Markdown
58 lines
1.6 KiB
Markdown
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# Memory service spec
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The memory service uses the first byte in the message to identify the request type.
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## Allocate (12 bytes)
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[0] -> 0
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[1] -> Page count
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<!-- Currently this does not allocate here, check r1 for a ptr to alloc to -->
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[2..10] -> ptr to alloc at
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## Deallocate (12 bytes)
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<!-- Currently this does not deallocate -->
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[0] -> 1
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[1] -> Page count
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[2..10] -> ptr to dealloc from
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## Map Device Into Memory
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Typically only used for simple drivers such as vga.
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<!-- Unimp -->
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[0] -> 2
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[1] -> Page count
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[2..10] -> HostID
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[11..19] -> DeviceID
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## Unmap Device From Memory
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<!-- Unimp -->
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[0] -> 3
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[1] -> Page count
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[2..10] -> HostID
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[11..19] -> DeviceID
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## Set Memory Quota
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<!-- unimp -->
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[0] -> 4
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[1..9] -> HostID
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[10..18] -> ProcessID
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[19] -> Refer to the Memory Quota Table
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[20..28] -> Memory quota. In pages of memory. Multiply by 4096 to get the total byte count.
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### Memory Quota Table
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0 -> No quota.
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1 -> Soft quota. Notifies the process supervisor.
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2 -> Hard quota. Refuses to allocate above the quota.
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3 -> Kill quota. Kill the process and notify the supervisor when the process tries to allocate above the quota.
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## Set Buffer Quota
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<!-- unimp -->
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[0] -> 4
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[1..9] -> HostID
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[10..18] -> BufferID
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[19] -> Refer to the Buffer Quota Table
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[20..28] -> Buffer quota. In pages of memory. Multiply by 4096 to get the total byte count.
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### Buffer Quota Table
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<!-- Because of the abusability of buffers there is no Kill Quota -->
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0 -> No quota
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1 -> Soft quota. Notify supervisor of quota violation Buffer Message
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2 -> Hard quota. Return an error message to the process that sent the message.
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