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Kernel: Implement IPI broadcasting

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Bananymous
2024-03-09 23:53:38 +02:00
parent 2323a55517
commit 89ca4c8a8b
8 changed files with 36 additions and 5 deletions
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30
kernel/kernel/APIC.cpp
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@@ -215,9 +215,8 @@ namespace Kernel
io_apic.max_redirs = io_apic.read(IOAPIC_MAX_REDIRS);
}
// Mask all interrupts
uint32_t sivr = apic->read_from_local_apic(LAPIC_SIV_REG);
apic->write_to_local_apic(LAPIC_SIV_REG, sivr | 0x1FF);
// Enable local apic
apic->write_to_local_apic(LAPIC_SIV_REG, apic->read_from_local_apic(LAPIC_SIV_REG) | 0x1FF);
return apic;
}
@@ -313,6 +312,28 @@ namespace Kernel
dprintln("{} processors started", *g_ap_running_count);
}
void APIC::broadcast_ipi()
{
write_to_local_apic(LAPIC_ICR_HI_REG, (read_from_local_apic(LAPIC_ICR_HI_REG) & 0x00FFFFFF) | 0xFF000000);
write_to_local_apic(LAPIC_ICR_LO_REG,
(read_from_local_apic(LAPIC_ICR_LO_REG) & ICR_LO_reserved_mask)
| ICR_LO_delivery_mode_fixed
| ICR_LO_destination_mode_physical
| ICR_LO_level_assert
| ICR_LO_trigger_mode_level
| ICR_LO_destination_shorthand_all_excluding_self
| (IRQ_VECTOR_BASE + IRQ_IPI)
);
while ((read_from_local_apic(LAPIC_ICR_LO_REG) & ICR_LO_delivery_status_send_pending) == ICR_LO_delivery_status_send_pending)
__builtin_ia32_pause();
}
void APIC::enable()
{
write_to_local_apic(LAPIC_SIV_REG, read_from_local_apic(LAPIC_SIV_REG) | 0x1FF);
}
uint32_t APIC::read_from_local_apic(ptrdiff_t offset)
{
return MMIO::read32(m_local_apic_vaddr + offset);
@@ -370,7 +391,8 @@ namespace Kernel
redir.vector = IRQ_VECTOR_BASE + irq;
redir.mask = 0;
redir.destination = m_processors.front().apic_id;
// FIXME: distribute IRQs more evenly?
redir.destination = Kernel::Processor::bsb_id();
ioapic->write(IOAPIC_REDIRS + gsi * 2, redir.lo_dword);
ioapic->write(IOAPIC_REDIRS + gsi * 2 + 1, redir.hi_dword);