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#include <cstdint>
#include <generic/heap.hpp>
#include <arch/x86_64/cpu/gdt.hpp>
#include <generic/pmm.hpp>
#include <generic/hhdm.hpp>
#include <klibc/stdio.hpp>
#include <arch/x86_64/cpu_local.hpp>
#define KERNEL_STACK_SIZE 32 * 1024
x86_64::gdt::gdt_t original_gdt = {
{0,0,0,0,0,0}, /* 0x0 Null */
{0,0,0,0x9a,0xa2,0}, /* 0x08 64 bit code */
{0,0,0,0x92,0xa0,0}, /* just align user data and user code */
{0,0,0,0xF2,0,0}, /* 0x18 user data, here because its easier for syscalls */
{0,0,0,0xFA,0x20,0}, /* 0x20 user code */
{0x68,0,0,0x89,0x20,0,0,0} /* 0x28 tss */
};
void x86_64::gdt::init() {
gdt_t* new_gdt = new gdt_t;
tss_t* tss = new tss_t;
gdt_pointer_t* gdtr = new gdt_pointer_t;
klibc::memcpy(new_gdt,&original_gdt,sizeof(gdt_t));
tss->rsp[0] = (std::uint64_t)(pmm::buddy::alloc(KERNEL_STACK_SIZE).phys + etc::hhdm());
tss->ist[0] = (std::uint64_t)(pmm::buddy::alloc(KERNEL_STACK_SIZE).phys + etc::hhdm()); /* Exceptions */
tss->ist[1] = (std::uint64_t)(pmm::buddy::alloc(KERNEL_STACK_SIZE).phys + etc::hhdm()); /* Timer */
tss->ist[2] = (std::uint64_t)(pmm::buddy::alloc(KERNEL_STACK_SIZE).phys + etc::hhdm()); /* IRQ Layout */
tss->ist[3] = (std::uint64_t)(pmm::buddy::alloc(KERNEL_STACK_SIZE).phys + etc::hhdm()); /* For ignorestub */
tss->iopb_offsset = sizeof(tss_t);
new_gdt->tss.baselow16 = (std::uint64_t)tss & 0xFFFF;
new_gdt->tss.basemid8 = ((std::uint64_t)tss >> 16) & 0xFF;
new_gdt->tss.basehigh8 = ((std::uint64_t)tss >> 24) & 0xFF;
new_gdt->tss.baseup32 = (std::uint64_t)tss >> 32;
gdtr->size = sizeof(gdt_t) - 1;
gdtr->base = (std::uint64_t)new_gdt;
load_gdt(gdtr);
load_tss();
x86_64::restore_cpu_data();
auto cpudata = x86_64::cpu_data();
cpudata->timer_ist_stack = (std::uint64_t)(pmm::buddy::alloc(KERNEL_STACK_SIZE).phys + etc::hhdm());
static bool is_print = 0;
if(!is_print) { log("gdt", "tss->rsp0 0x%p tss->ist0 0x%p",tss->rsp[0],tss->ist[0],tss->ist[1],tss->ist[2],tss->ist[3],cpudata->timer_ist_stack); is_print = 1; }
}
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