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Kernel: Fixing PCI MMIO access mechanism

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During initialization of PCI MMIO access mechanism we ensure that we
have an allocation from the kernel virtual address space that cannot be
taken by other components in the OS.
Also, now we ensure that interrupts are disabled so mapping the region
doesn't fail.
In order to reduce overhead, map_device() will map the requested PCI
address only if it's not mapped already.

The run script has been changed so now we can boot a Q35 machine, that
supports PCI ECAM.
To ensure we will be able to load the machine, a PIIX3 IDE controller
was added to the Q35 machine configuration in the run script.
An AHCI controller was added to the i440fx machine configuration.
This commit is contained in:
Liav A 2020-01-02 15:54:32 +02:00 • committed by Andreas Kling
parent 5e430e4eb4
commit 2a4a19aed8
4 changed files with 110 additions and 24 deletions
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30
Kernel/run
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@ -22,6 +22,22 @@ $SERENITY_EXTRA_QEMU_ARGS
-d cpu_reset,guest_errors
-device VGA,vgamem_mb=64
-hda _disk_image
-device ich9-ahci
-debugcon stdio
-soundhw pcspk
-soundhw sb16
"
[ -z "$SERENITY_COMMON_QEMU_Q35_ARGS" ] && SERENITY_COMMON_QEMU_Q35_ARGS="
$SERENITY_EXTRA_QEMU_ARGS
-s -m $SERENITY_RAM_SIZE
-cpu max
-machine q35
-d cpu_reset,guest_errors
-device VGA,vgamem_mb=64
-device piix3-ide
-drive file=_disk_image,id=disk,if=none
-device ide-hd,bus=ide.6,drive=disk,unit=0
-debugcon stdio
-soundhw pcspk
-soundhw sb16
@ -57,6 +73,20 @@ elif [ "$1" = "qgrub" ]; then
$SERENITY_PACKET_LOGGING_ARG \
-netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23 \
-device e1000,netdev=breh
elif [ "$1" = "q35_cmd" ]; then
SERENITY_KERNEL_CMDLINE=""
# FIXME: Someone who knows sh syntax better, please help:
for i in `seq 2 $#`; do
shift
SERENITY_KERNEL_CMDLINE="$SERENITY_KERNEL_CMDLINE $1"
done
echo "Starting SerenityOS, Commandline: ${SERENITY_KERNEL_CMDLINE}"
# ./run: qemu with SerenityOS with custom commandline
$SERENITY_QEMU_BIN \
$SERENITY_COMMON_QEMU_Q35_ARGS \
-device e1000 \
-kernel kernel \
-append "${SERENITY_KERNEL_CMDLINE}"
elif [ "$1" = "qcmd" ]; then
SERENITY_KERNEL_CMDLINE=""
# FIXME: Someone who knows sh syntax better, please help: