mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
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146e568db8
Motivation: userland is getting several new subdirectories, it would be too insane to just dump all of that in the guest root filesystem. To alleviate the cd pain, .profile puts user inside /lkmc by default.
57 lines
1.6 KiB
Bash
Executable File
57 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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set -ex
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# Our modules does not the PCI device yet.
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lspci -k
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# => 00:04.0 Class 00ff: 1234:11e8 lkmc_pci
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# Interrupt counts before we generate our interrupts.
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cat /proc/interrupts
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# Setup.
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insmod qemu_edu.ko
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/mknoddev.sh lkmc_pci
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# Shows that this module owns the PCI device.
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lspci -k
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# => 00:04.0 Class 00ff: 1234:11e8 lkmc_pci
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# Identifiction: just returns some fixed magic bytes.
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dd bs=4 status=none if=/dev/lkmc_pci count=1 skip=0 | od -An -t x1
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# => 010000ed
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# Negator. Sanity check that the hardware is getting updated.
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dd bs=4 status=none if=/dev/lkmc_pci count=1 skip=1 | od -An -t x1
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printf '\xF0\xF0\xF0\xF0' | dd bs=4 status=none of=/dev/lkmc_pci count=1 seek=1
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dd bs=4 status=none if=/dev/lkmc_pci count=1 skip=1 | od -An -t x1
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# => 0F0F0F0F
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# Factorial calculator.
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# Request interrupt when the computation is over.
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printf '\x80\x00\x00\x00' | dd bs=4 status=none of=/dev/lkmc_pci count=1 seek=8
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# factorial(0xC) = 0x1c8cfc00
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printf '\x0C\x00\x00\x00' | dd bs=4 status=none of=/dev/lkmc_pci count=1 seek=2
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# => irq_handler .*
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# Yes, we should use the interrupt to notify poll, but lazy.
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sleep 1
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dd bs=4 status=none if=/dev/lkmc_pci count=1 skip=2 | od -An -t x1
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dd bs=4 status=none if=/dev/lkmc_pci count=1 skip=8 | od -An -t x1
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# => 1c8cfc00
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# Manual IRQ raising.
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printf '\x04\x03\x02\x01' | dd bs=4 status=none of=/dev/lkmc_pci count=1 seek=24
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# => irq_handler .*
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sleep 1
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printf '\x08\x07\x06\x05' | dd bs=4 status=none of=/dev/lkmc_pci count=1 seek=24
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# => irq_handler .*
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sleep 1
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# Teardown.
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rm /dev/lkmc_pci
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rmmod qemu_edu
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# Interrupt counts after we generate our interrupts.
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# Compare with before.
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cat /proc/interrupts
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