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Add a reboot() function

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This reboot function first tries to reboot using ACPI, then pulsing the CPU's RESET line through the keyboard, then triple-faulting. If we're still there, it halts.
This commit is contained in:
apio 2022-09-06 11:47:55 +02:00
parent aa673e1402
commit a1659aa127
2 changed files with 68 additions and 0 deletions
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3
kernel/include/power/reboot.h Normal file
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#pragma once
[[noreturn]] void reboot();

65
kernel/src/power/reboot.cpp Normal file
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#include "power/reboot.h"
#include "acpi/FADT.h"
#include "acpi/RSDT.h"
#include "assert.h"
#include "interrupts/IDT.h"
#include "interrupts/Interrupts.h"
#include "io/IO.h"
#include "log/Log.h"
#include "panic/hang.h"
#include "std/string.h"
static void try_acpi_reboot()
{
ACPI::SDTHeader* rootSDT = ACPI::GetRSDTOrXSDT();
if (!rootSDT) return;
if (!ACPI::ValidateSDTHeader(rootSDT)) return;
if (strncmp(rootSDT->Signature, "RSDT", 4) != 0 && strncmp(rootSDT->Signature, "XSDT", 4) != 0) return;
ACPI::FADT* fadt = (ACPI::FADT*)ACPI::FindTable(rootSDT, "FACP");
if (!fadt) return;
if (!ACPI::ValidateSDTHeader(&fadt->header)) return;
if (!(fadt->Flags & 1 << 10)) return;
switch (fadt->ResetReg.AddressSpace)
{
case ACPI::SystemIO: IO::outb(fadt->ResetReg.Address, fadt->ResetValue); break;
case ACPI::GeneralPurposeIO: IO::outb(fadt->ResetReg.Address, fadt->ResetValue); break;
default: return;
}
}
static void try_kbd_reboot()
{
Interrupts::disable();
uint8_t temp;
do {
temp = IO::inb(0x64);
if (temp & 0b1) IO::inb(0x60);
} while (temp & 0b10);
IO::outb(0x64, 0xFE);
}
static void try_idt_triple_fault()
{
IDTR idtr;
idtr.limit = 0x0000;
idtr.offset = 0x0000;
asm volatile("lidt %0" : : "m"(idtr));
Interrupts::enable();
asm volatile("int $0x80");
}
[[noreturn]] void reboot()
{
kinfoln("Attempting reboot using ACPI");
try_acpi_reboot();
kinfoln("Attempting reboot using keyboard RESET pulsing");
try_kbd_reboot();
kinfoln("Attempting reboot by triple faulting");
try_idt_triple_fault();
kerrorln("Failed to reboot, halting machine");
hang();
end:
goto end;
}