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Kernel+Userland: Addd reboot syscall (#334)

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Rolling with the theme of adding a dialog to shutdown the machine, it is
probably nice to have a way to reboot the machine without performing a full
system powerdown.

A reboot program has been added to `/bin/` as well as a corresponding
`syscall` (SC_reboot). This syscall works by attempting to pulse the 8042
keyboard controller. Note that this is NOT supported on  new machines, and
should only be a fallback until we have proper ACPI support.

The implementation causes a triple fault in QEMU, which then restarts the
system. The filesystems are locked and synchronized before this occurs,
so there shouldn't be any corruption etctera.
This commit is contained in:
Jesse 2019-07-19 17:58:12 +10:00 • committed by Andreas Kling
parent 23d45532fc
commit a27c9e3e01
7 changed files with 45 additions and 2 deletions
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3
Kernel/Syscall.cpp
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@ -293,6 +293,9 @@ static u32 handle(RegisterDump& regs, u32 function, u32 arg1, u32 arg2, u32 arg3
IO::out16(0x604, 0x2000);
break;
}
case Syscall::SC_reboot: {
return current->process().sys$reboot();
}
default:
kprintf("<%u> int0x82: Unknown function %u requested {%x, %x, %x}\n", current->process().pid(), function, arg1, arg2, arg3);
return -ENOSYS;