#include <stdint.h>
#include <string.h>

#include "assert.h"
#include "cpu.h"
#include "cpu/cpu_id.h"
#include "device_manager.h"
#include "gdt.h"
#include "idt.h"
#include "log.h"
#include "msr.h"
#include "objects/vm_area.h"
#include "syscall.h"
#include "tss.h"

unsigned g_num_cpus = 1;

panic_data g_panic_data;
panic_data *g_panic_data_p = &g_panic_data;

cpu_data g_bsp_cpu_data;

void
cpu_validate()
{
    cpu::cpu_id cpu;

    log::info(logs::boot, "CPU: %s", cpu.brand_name());
    log::debug(logs::boot, "    Vendor is %s", cpu.vendor_id());

    log::debug(logs::boot, "    Higest basic CPUID: 0x%02x", cpu.highest_basic());
    log::debug(logs::boot, "    Higest ext CPUID:   0x%02x", cpu.highest_ext() & ~cpu::cpu_id::cpuid_extended);

#define CPU_FEATURE_OPT(name, ...) \
    log::debug(logs::boot, "    Supports %9s: %s", #name, cpu.has_feature(cpu::feature::name) ? "yes" : "no");

#define CPU_FEATURE_REQ(name, feat_leaf, feat_sub, regname, bit) \
    CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit); \
    kassert(cpu.has_feature(cpu::feature::name), "Missing required CPU feature " #name );

#include "cpu/features.inc"
#undef CPU_FEATURE_OPT
#undef CPU_FEATURE_REQ
}

void
global_cpu_init()
{
    memset(&g_panic_data, 0, sizeof(g_panic_data));
}

void
cpu_early_init(cpu_data *cpu)
{
    if (cpu->index == 0)
        global_cpu_init();

    cpu->idt->install();
    cpu->gdt->install();

    // Install the GS base pointint to the cpu_data
    wrmsr(msr::ia32_gs_base, reinterpret_cast<uintptr_t>(cpu));

    // Set the initial process as the kernel "process"
    extern process &g_kernel_process;
    cpu->process = &g_kernel_process;
}

void
cpu_init(cpu_data *cpu, bool bsp)
{
    if (!bsp) {
        // The BSP already called cpu_early_init
        cpu_early_init(cpu);
    }

    // Set up the syscall MSRs
    syscall_enable();

    // Set up the page attributes table
    uint64_t pat = rdmsr(msr::ia32_pat);
    pat = (pat & 0x00ffffffffffffffull) | (0x01ull << 56); // set PAT 7 to WC
    wrmsr(msr::ia32_pat, pat);

    cpu->idt->add_ist_entries();
}