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/*
 * Copyright (C) 2005 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch.h>

#include <arch/types.h>

#include <config.h>

#include <proc/thread.h>
#include <arch/drivers/ega.h>
#include <arch/drivers/vesa.h>
#include <genarch/i8042/i8042.h>
#include <arch/drivers/i8254.h>
#include <arch/drivers/i8259.h>

#include <arch/bios/bios.h>
#include <arch/mm/memory_init.h>
#include <arch/cpu.h>
#include <print.h>
#include <arch/cpuid.h>
#include <genarch/acpi/acpi.h>
#include <panic.h>
#include <interrupt.h>
#include <arch/syscall.h>
#include <arch/debugger.h>
#include <syscall/syscall.h>
#include <console/console.h>


/** Disable I/O on non-privileged levels
 *
 * Clean IOPL(12,13) and NT(14) flags in EFLAGS register
 */
static void clean_IOPL_NT_flags(void)
{
    asm
    (
        "pushfq;"
        "pop %%rax;"
        "and $~(0x7000),%%rax;"
        "pushq %%rax;"
        "popfq;"
        :
        :
        :"%rax"
    );
}

/** Disable alignment check
 *
 * Clean AM(18) flag in CR0 register 
 */
static void clean_AM_flag(void)
{
    asm
    (
        "mov %%cr0,%%rax;"
        "and $~(0x40000),%%rax;"
        "mov %%rax,%%cr0;"
        :
        :
        :"%rax"
    );
}

void arch_pre_mm_init(void)
{
    struct cpu_info cpuid_s;

    cpuid(AMD_CPUID_EXTENDED,&cpuid_s);
    if (! (cpuid_s.cpuid_edx & (1<<AMD_EXT_NOEXECUTE)))
        panic("Processor does not support No-execute pages.\n");

    cpuid(INTEL_CPUID_STANDARD,&cpuid_s);
    if (! (cpuid_s.cpuid_edx & (1<<INTEL_FXSAVE)))
        panic("Processor does not support FXSAVE/FXRESTORE.\n");
    
    if (! (cpuid_s.cpuid_edx & (1<<INTEL_SSE2)))
        panic("Processor does not support SSE2 instructions.\n");

    /* Enable No-execute pages */
    set_efer_flag(AMD_NXE_FLAG);
    /* Enable FPU */
    cpu_setup_fpu();

    /* Initialize segmentation */
    pm_init();

        /* Disable I/O on nonprivileged levels
     * clear the NT(nested-thread) flag 
     */
    clean_IOPL_NT_flags();
    /* Disable alignment check */
    clean_AM_flag();

    if (config.cpu_active == 1) {
        bios_init();
        i8259_init();   /* PIC */
        i8254_init();   /* hard clock */

        #ifdef CONFIG_SMP
        exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown",
                 tlb_shootdown_ipi);
        #endif /* CONFIG_SMP */
    }
}

void arch_post_mm_init(void)
{
    if (config.cpu_active == 1) {
#ifdef CONFIG_FB
        if (vesa_present()) 
            vesa_init();
        else
#endif
            ega_init(); /* video */
        /* Enable debugger */
        debugger_init();
        /* Merge all memory zones to 1 big zone */
        zone_merge_all();
    }
    /* Setup fast SYSCALL/SYSRET */
    syscall_setup_cpu();
    
}

void arch_pre_smp_init(void)
{
    if (config.cpu_active == 1) {
        memory_print_map();
        
        #ifdef CONFIG_SMP
        acpi_init();
        #endif /* CONFIG_SMP */
    }
}

void arch_post_smp_init(void)
{
    i8042_init();   /* keyboard controller */
}

void calibrate_delay_loop(void)
{
    i8254_calibrate_delay_loop();
    i8254_normal_operation();
}

/** Set thread-local-storage pointer
 *
 * TLS pointer is set in FS register. Unfortunately the 64-bit
 * part can be set only in CPL0 mode.
 *
 * The specs say, that on %fs:0 there is stored contents of %fs register,
 * we need not to go to CPL0 to read it.
 */
__native sys_tls_set(__native addr)
{
    THREAD->arch.tls = addr;
    write_msr(AMD_MSR_FS, addr);
    return 0;
}

/** Acquire console back for kernel
 *
 */
void arch_grab_console(void)
{
    i8042_grab();
}
/** Return console to userspace
 *
 */
void arch_release_console(void)
{
    i8042_release();
}