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Kernel: Implement MSI, MSI-X and interrupt reservation

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Bananymous
2024-01-13 17:11:26 +02:00
parent 56a29dc176
commit c6130f33d7
14 changed files with 310 additions and 40 deletions
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71
kernel/kernel/APIC.cpp
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@@ -223,8 +223,16 @@ namespace Kernel
void APIC::enable_irq(uint8_t irq)
{
CriticalScope _;
uint32_t gsi = m_irq_overrides[irq];
{
int byte = gsi / 8;
int bit = gsi % 8;
ASSERT(m_reserved_gsis[byte] & (1 << bit));
}
IOAPIC* ioapic = nullptr;
for (IOAPIC& io : m_io_apics)
{
@@ -258,4 +266,67 @@ namespace Kernel
return isr & (1 << bit);
}
BAN::ErrorOr<void> APIC::reserve_irq(uint8_t irq)
{
CriticalScope _;
uint32_t gsi = m_irq_overrides[irq];
IOAPIC* ioapic = nullptr;
for (IOAPIC& io : m_io_apics)
{
if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
{
ioapic = &io;
break;
}
}
if (!ioapic)
{
dwarnln("Cannot enable irq {} for APIC", irq);
return BAN::Error::from_errno(EFAULT);
}
int byte = gsi / 8;
int bit = gsi % 8;
if (m_reserved_gsis[byte] & (1 << bit))
{
dwarnln("irq {} is already reserved", irq);
return BAN::Error::from_errno(EFAULT);
}
m_reserved_gsis[byte] |= 1 << bit;
return {};
}
BAN::Optional<uint8_t> APIC::get_free_irq()
{
CriticalScope _;
for (int irq = 0; irq <= 0xFF; irq++)
{
uint32_t gsi = m_irq_overrides[irq];
IOAPIC* ioapic = nullptr;
for (IOAPIC& io : m_io_apics)
{
if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
{
ioapic = &io;
break;
}
}
if (!ioapic)
continue;
int byte = gsi / 8;
int bit = gsi % 8;
if (m_reserved_gsis[byte] & (1 << bit))
continue;
m_reserved_gsis[byte] |= 1 << bit;
return irq;
}
return {};
}
}