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#include <ioapic.h>
#include <apic.h>
#include <paging.h>
#include <libk/stdio.h>
#include <msr.h>
#include <idt.h>
void ioapic_eoi()
{
*((__volatile__ uint32_t *)((uint64_t)lapic_addr + 0xB0)) = 0;
}
uint32_t ioapic_read(const uint8_t offset)
{
/* tell IOREGSEL where we want to read from */
*(__volatile__ uint32_t *)(uint64_t)ioapic_addr = offset;
/* return the data from IOWIN */
return *(__volatile__ uint32_t *)((uint64_t)ioapic_addr + 0x10);
}
void ioapic_write(const uint8_t offset, const uint32_t val)
{
/* tell IOREGSEL where we want to write to */
*(__volatile__ uint32_t *)(uint64_t)ioapic_addr = offset;
/* write the value to IOWIN */
*(__volatile__ uint32_t *)((uint64_t)ioapic_addr + 0x10) = val;
}
void ioapic_set_irq(uint8_t irq, uint64_t apic_id, uint8_t vector)
{
const uint32_t low_index = (uint32_t)0x10 + irq * 2;
const uint32_t high_index = (uint32_t)0x10 + irq * 2 + 1;
uint32_t high;
uint32_t low;
high = ioapic_read((uint8_t)high_index);
/* set APIC ID */
high &= (uint32_t)~0xff000000;
high |= (uint32_t)apic_id << 24;
ioapic_write((uint8_t)high_index, high);
low = ioapic_read((uint8_t)low_index);
/* unmask the IRQ */
low &= (uint32_t) ~(1 << 16);
/* set to physical delivery mode */
low &= (uint32_t) ~(1 << 11);
/* set to fixed delivery mode */
low &= (uint32_t)~0x700;
/* set delivery vector */
low &= (uint32_t)~0xff;
low |= vector;
ioapic_write((uint8_t)low_index, low);
}
void apic_remap_interrupts()
{
uint8_t bspid;
map_addr(ioapic_addr, ioapic_addr, FLAG_PRESENT);
map_addr(lapic_addr, lapic_addr, FLAG_PRESENT);
bspid = curr_cpu_apic_id();
/* irq is 2 because of gsi remap */
ioapic_set_irq(0x2, bspid, 0x20); /* timer */
ioapic_set_irq(0x1, bspid, 0x21); /* keyboard */
write_msr(APIC_BASE_MSR, read_msr(APIC_BASE_MSR) | (1 << 11));
*((__volatile__ uint32_t *)(lapic_addr + 0xF0)) =
(*(__volatile__ uint32_t *)(lapic_addr + 0xF0) | 0x1FF);
}
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