66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
#include <socks/compiler.h>
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#include <socks/printk.h>
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#include <arch/acpi/io_apic.hpp>
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#define IOAPICID 0x00
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#define IOAPICVER 0x01
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#define IOAPICARB 0x02
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#define IOAPICREDTBL(n) (0x10 + 2 * n)
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namespace arch::acpi {
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io_apic::io_apic(uint32_t *base, unsigned int first_irq) : io_base(base), io_first_irq(first_irq)
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{
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io_nr_irq = ((read(IOAPICVER) >> 16) + 1) & 0xFF;
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}
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uint32_t io_apic::read(uint32_t reg)
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{
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*(volatile uint32_t *)(io_base) = reg & 0xFF;
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return *(volatile uint32_t *)((char *)io_base + 0x10);
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}
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void io_apic::write(uint32_t reg, uint32_t val)
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{
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*(volatile uint32_t *)(io_base) = reg & 0xFF;
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*(volatile uint32_t *)((char *)io_base + 0x10) = val;
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}
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kern_status_t io_apic::read_irq(unsigned int index, irq_entry &entry)
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{
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if (index >= io_nr_irq) {
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return KERN_NO_ENTRY;
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}
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uint32_t *entry_data = (uint32_t *)&entry;
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entry_data[0] = read(IOAPICREDTBL(index));
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entry_data[1] = read(IOAPICREDTBL(index) + 1);
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return KERN_OK;
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}
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void io_apic::write_irq(unsigned int index, const irq_entry &entry)
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{
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if (index >= io_nr_irq) {
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return;
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}
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const uint32_t *entry_data = (const uint32_t *)&entry;
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write(IOAPICREDTBL(index), entry_data[0]);
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write(IOAPICREDTBL(index) + 1, entry_data[1]);
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}
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void io_apic::map_irq(unsigned int src, unsigned int dest)
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{
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io_apic::irq_entry irq{};
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irq.irq_vec = dest;
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irq.irq_delivery = 0;
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irq.irq_destmode = 0;
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irq.irq_polarity = 0;
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irq.irq_triggermode = 0;
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irq.irq_mask = 0;
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irq.irq_dest = 0;
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write_irq(src, irq);
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}
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}
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