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Kernel: Fix IOAPIC max redirection entry fetching 

Also max redirection entry is an index, not count so comparisons should
check for equality :)
This commit is contained in:
Bananymous 2025-08-25 17:14:17 +03:00
parent 9a6eae69ba
commit a4698f0bde
1 changed files with 6 additions and 6 deletions
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12
kernel/kernel/APIC.cpp
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@ -22,8 +22,8 @@
#define LAPIC_TIMER_CURRENT_REG 0x390
#define LAPIC_TIMER_DIVIDE_REG 0x3E0
#define IOAPIC_MAX_REDIRS 0x01
#define IOAPIC_REDIRS 0x10
#define IOAPIC_APICVER 0x01
#define IOAPIC_REDIRS 0x10
// https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#multiple-apic-description-table-madt-format
@ -238,7 +238,7 @@ namespace Kernel
io_apic.vaddr & PAGE_ADDR_MASK,
PageTable::Flags::ReadWrite | PageTable::Flags::Present
);
io_apic.max_redirs = io_apic.read(IOAPIC_MAX_REDIRS);
io_apic.max_redirs = (io_apic.read(IOAPIC_APICVER) >> 16) & 0xFF;
}
// Enable local apic
@ -470,7 +470,7 @@ namespace Kernel
IOAPIC* ioapic = nullptr;
for (IOAPIC& io : m_io_apics)
{
if (io.gsi_base <= gsi && gsi < io.gsi_base + io.max_redirs)
if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
{
ioapic = &io;
break;
@ -512,7 +512,7 @@ namespace Kernel
bool found_ioapic = false;
for (const auto& io : m_io_apics)
{
if (io.gsi_base <= gsi && gsi < io.gsi_base + io.max_redirs)
if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
{
found_ioapic = true;
break;
@ -566,7 +566,7 @@ namespace Kernel
IOAPIC* ioapic = nullptr;
for (IOAPIC& io : m_io_apics)
{
if (io.gsi_base <= gsi && gsi < io.gsi_base + io.max_redirs)
if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
{
ioapic = &io;
break;