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#include <cstdint>
#include <arch/x86_64/cpu/idt.hpp>
#include <utils/bitmap.hpp>
#include <klibc/stdio.hpp>
#include <arch/x86_64/cpu/lapic.hpp>
#include <utils/assert.hpp>
x86_64::idt::idt_entry_t idt_entries[255];
utils::bitmap* idt_bitmap;
x86_64::idt::idtr_t idtr;
extern "C" void* isrTable[];
extern "C" void ignoreStubC() {
assert(0,"ignore stub");
x86_64::lapic::eoi();
}
void x86_64::idt::init() {
static bool is_print = 0;
if(!is_print) {
klibc::memset(idt_entries,0,sizeof(idt_entries));
idt_bitmap = new utils::bitmap(255);
idtr.base = (std::uint64_t)idt_entries;
idtr.limit = (std::uint16_t)sizeof(idt_entry_t) * 256 - 1;
for(uint8_t vec = 0;vec <32;vec++){
set_entry((std::uint64_t)isrTable[vec],vec,0x8E,1);
}
for(uint8_t vec = 32; vec < 255; vec++) {
set_entry((std::uint64_t)ignoreStub,vec,0x8E,4);
idt_bitmap->clear(vec);
}
idt_bitmap->set(32);
}
load();
if(!is_print) {log("idt", "idtr is 0x%p",&idtr); is_print = 1;}
}
void x86_64::idt::load() {
__asm__ volatile ("lidt %0" : : "m"(idtr));
}
void x86_64::idt::set_entry(std::uint64_t base,std::uint8_t vec,std::uint8_t flags,std::uint8_t ist) {
idt_entry_t* descriptor = &idt_entries[vec];
descriptor->low = (std::uint64_t)base & 0xFFFF;
descriptor->cs = 0x08;
descriptor->ist = ist;
descriptor->attr = flags;
descriptor->mid = ((std::uint64_t)base >> 16) & 0xFFFF;
descriptor->high = ((std::uint64_t)base >> 32) & 0xFFFFFFFF;
descriptor->reserved0 = 0;
idt_bitmap->set(vec);
}
std::uint8_t x86_64::idt::alloc() {
for(int i = 0;i < 255;i++) {
if(!idt_bitmap->test(i)) {
idt_bitmap->set(i);
return i;
}
}
return 0;
}
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