70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <sys/idt.h>
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#include <sys/cpu.h>
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#include <sys/pic.h>
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#include <sys/lapic.h>
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#include <mm/pmm.h>
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#include <lib/misc.h>
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static struct idt_entry *dummy_idt = NULL;
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void dummy_isr(void);
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void init_flush_irqs(void) {
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size_t dummy_idt_size = 256 * sizeof(struct idt_entry);
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dummy_idt = ext_mem_alloc(dummy_idt_size);
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for (size_t i = 0; i < 256; i++) {
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dummy_idt[i].offset_lo = (uint16_t)(uintptr_t)dummy_isr;
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dummy_idt[i].type_attr = 0x8e;
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#if defined (__i386__)
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dummy_idt[i].selector = 0x18;
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dummy_idt[i].offset_hi = (uint16_t)((uintptr_t)dummy_isr >> 16);
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#elif defined (__x86_64__)
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dummy_idt[i].selector = 0x28;
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dummy_idt[i].offset_mid = (uint16_t)((uintptr_t)dummy_isr >> 16);
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dummy_idt[i].offset_hi = (uint32_t)((uintptr_t)dummy_isr >> 32);
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#endif
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}
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pmm_free(dummy_idt, dummy_idt_size);
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}
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int irq_flush_type = IRQ_NO_FLUSH;
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void flush_irqs(void) {
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switch (irq_flush_type) {
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case IRQ_PIC_ONLY_FLUSH:
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pic_flush();
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// FALLTHRU
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case IRQ_NO_FLUSH:
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return;
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case IRQ_PIC_APIC_FLUSH:
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break;
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default:
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panic(false, "Invalid IRQ flush type");
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}
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struct idtr old_idt;
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asm volatile ("sidt %0" : "=m"(old_idt) :: "memory");
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struct idtr new_idt = {
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256 * sizeof(struct idt_entry) - 1,
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(uintptr_t)dummy_idt
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};
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asm volatile ("lidt %0" :: "m"(new_idt) : "memory");
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// Flush the legacy PIC so we know the remaining ints come from the LAPIC
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pic_flush();
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asm volatile ("sti" ::: "memory");
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// Delay a while to make sure we catch ALL pending IRQs
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delay(10000000);
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asm volatile ("cli" ::: "memory");
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asm volatile ("lidt %0" :: "m"(old_idt) : "memory");
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}
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