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#include <cstdint>
#include <generic/mm/pmm.hpp>
#include <generic/mm/paging.hpp>
#include <generic/mm/heap.hpp>
#include <arch/x86_64/cpu/data.hpp>
#include <arch/x86_64/cpu/gdt.hpp>
#include <etc/libc.hpp>
#include <config.hpp>
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 arch::x86_64::cpu::gdt::init() {
arch::x86_64::cpu::gdt* new_gdt = (arch::x86_64::cpu::gdt*)memory::heap::malloc(sizeof(arch::x86_64::cpu::gdt));
tss_t* tss = new tss_t;
/* For optimizations kheap doesn't zero memory */
memset(&new_gdt->gdt_obj,0,sizeof(gdt_t));
memset(tss,0,sizeof(tss_t));
memcpy(&new_gdt->gdt_obj,&original_gdt,sizeof(gdt_t));
tss->rsp[0] = memory::pmm::helper::alloc_kernel_stack(KERNEL_STACK_SIZE);
tss->ist[0] = memory::pmm::helper::alloc_kernel_stack(KERNEL_STACK_SIZE); /* Exceptions */
tss->ist[1] = memory::pmm::helper::alloc_kernel_stack(KERNEL_STACK_SIZE); /* Timer */
tss->ist[2] = memory::pmm::helper::alloc_kernel_stack(KERNEL_STACK_SIZE); /* IRQ Layout */
tss->ist[3] = memory::pmm::helper::alloc_kernel_stack(KERNEL_STACK_SIZE); /* For ignorestub */
tss->iopb_offsset = sizeof(tss_t);
new_gdt->gdt_obj.tss.baselow16 = (std::uint64_t)tss & 0xFFFF;
new_gdt->gdt_obj.tss.basemid8 = ((std::uint64_t)tss >> 16) & 0xFF;
new_gdt->gdt_obj.tss.basehigh8 = ((std::uint64_t)tss >> 24) & 0xFF;
new_gdt->gdt_obj.tss.baseup32 = (std::uint64_t)tss >> 32;
new_gdt->gdtr.size = sizeof(gdt_t) - 1;
new_gdt->gdtr.base = (std::uint64_t)&new_gdt->gdt_obj;
new_gdt->LoadGDT();
new_gdt->LoadTSS();
/* Also i want to init cpu data too */
auto cpudata = arch::x86_64::cpu::data();
cpudata->timer_ist_stack = memory::pmm::helper::alloc_kernel_stack(KERNEL_STACK_SIZE);
}
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