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/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * Copyright (c) 2009 Jiri Svoboda
 * Copyright (c) 2009 Martin Decky
 * 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.
 */

/** @addtogroup ia32
 * @{
 */
/** @file
 */

#include <arch.h>

#include <arch/types.h>

#include <arch/pm.h>

#include <genarch/drivers/legacy/ia32/io.h>
#include <genarch/drivers/ega/ega.h>
#include <arch/drivers/vesa.h>
#include <genarch/kbd/i8042.h>
#include <arch/drivers/i8254.h>
#include <arch/drivers/i8259.h>

#include <arch/context.h>

#include <config.h>

#include <arch/interrupt.h>
#include <arch/asm.h>
#include <genarch/acpi/acpi.h>

#include <arch/bios/bios.h>

#include <interrupt.h>
#include <ddi/irq.h>
#include <arch/debugger.h>
#include <proc/thread.h>
#include <syscall/syscall.h>
#include <console/console.h>
#include <ddi/device.h>
#include <sysinfo/sysinfo.h>
#include <arch/boot/boot.h>
#include <string.h>
#include <macros.h>

#ifdef CONFIG_SMP
#include <arch/smp/apic.h>
#endif

/** Extract command name from the multiboot module command line.
 *
 * @param buf      Destination buffer (will always null-terminate).
 * @param n        Size of destination buffer.
 * @param cmd_line Input string (the command line).
 *
 */
static void extract_command(char *buf, size_t n, const char *cmd_line)
{
    const char *start, *end, *cp;
    size_t max_len;
    
    /* Find the first space. */
    end = strchr(cmd_line, ' ');
    if (end == NULL)
        end = cmd_line + strlen(cmd_line);
    
    /*
     * Find last occurence of '/' before 'end'. If found, place start at
     * next character. Otherwise, place start at beginning of buffer.
     */
    cp = end;
    start = buf;
    while (cp != start) {
        if (*cp == '/') {
            start = cp + 1;
            break;
        }
        --cp;
    }
    
    /* Copy the command and null-terminate the string. */
    max_len = min(n - 1, (size_t) (end - start));
    strncpy(buf, start, max_len + 1);
    buf[max_len] = '\0';
}

/** C part of ia32 boot sequence.
 *
 * @param signature Should contain the multiboot signature.
 * @param mi        Pointer to the multiboot information structure.
 */
void arch_pre_main(uint32_t signature, const mb_info_t *mi)
{
    uint32_t flags;
    mb_mod_t *mods;
    uint32_t i;
    
    if (signature == MULTIBOOT_LOADER_MAGIC)
        flags = mi->flags;
    else {
        /* No multiboot info available. */
        flags = 0;
    }
    
    /* Copy module information. */
    
    if ((flags & MBINFO_FLAGS_MODS) != 0) {
        init.cnt = mi->mods_count;
        mods = mi->mods_addr;
        
        for (i = 0; i < init.cnt; i++) {
            init.tasks[i].addr = mods[i].start + 0x80000000;
            init.tasks[i].size = mods[i].end - mods[i].start;
            
            /* Copy command line, if available. */
            if (mods[i].string) {
                extract_command(init.tasks[i].name,
                    CONFIG_TASK_NAME_BUFLEN,
                    mods[i].string);
            } else
                init.tasks[i].name[0] = '\0';
        }
    } else
        init.cnt = 0;
    
    /* Copy memory map. */
    
    int32_t mmap_length;
    mb_mmap_t *mme;
    uint32_t size;
    
    if ((flags & MBINFO_FLAGS_MMAP) != 0) {
        mmap_length = mi->mmap_length;
        mme = mi->mmap_addr;
        e820counter = 0;
        
        i = 0;
        while (mmap_length > 0) {
            e820table[i++] = mme->mm_info;
            
            /* Compute address of next structure. */
            size = sizeof(mme->size) + mme->size;
            mme = ((void *) mme) + size;
            mmap_length -= size;
        }
        
        e820counter = i;
    } else
        e820counter = 0;
    
#ifdef CONFIG_SMP
    /* Copy AP bootstrap routines below 1 MB. */
    memcpy((void *) AP_BOOT_OFFSET, (void *) BOOT_OFFSET,
        (size_t) &_hardcoded_unmapped_size);
#endif
}

void arch_pre_mm_init(void)
{
    pm_init();

    if (config.cpu_active == 1) {
        interrupt_init();
        bios_init();
        
        /* PIC */
        i8259_init();
    }
}

void arch_post_mm_init(void)
{
    if (config.cpu_active == 1) {
        /* Initialize IRQ routing */
        irq_init(IRQ_COUNT, IRQ_COUNT);
        
        /* hard clock */
        i8254_init();

#ifdef CONFIG_FB
        if (vesa_present()) 
            vesa_init();
        else
#endif
            ega_init(EGA_BASE, EGA_VIDEORAM);   /* video */
        
        /* Enable debugger */
        debugger_init();
        /* Merge all memory zones to 1 big zone */
        zone_merge_all();
    }
}

void arch_post_cpu_init()
{
#ifdef CONFIG_SMP
        if (config.cpu_active > 1) {
        l_apic_init();
        l_apic_debug();
    }
#endif
}

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

void arch_post_smp_init(void)
{
    devno_t devno = device_assign_devno();
    /* keyboard controller */
    (void) i8042_init((i8042_t *) I8042_BASE, devno, IRQ_KBD);

    /*
     * This is the necessary evil until the userspace driver is entirely
     * self-sufficient.
     */
    sysinfo_set_item_val("kbd", NULL, true);
    sysinfo_set_item_val("kbd.devno", NULL, devno);
    sysinfo_set_item_val("kbd.inr", NULL, IRQ_KBD);
}

void calibrate_delay_loop(void)
{
    i8254_calibrate_delay_loop();
    if (config.cpu_active == 1) {
        /*
         * This has to be done only on UP.
         * On SMP, i8254 is not used for time keeping and its interrupt pin remains masked.
         */
        i8254_normal_operation();
    }
}

/** Set thread-local-storage pointer
 *
 * TLS pointer is set in GS register. That means, the GS contains
 * selector, and the descriptor->base is the correct address.
 */
unative_t sys_tls_set(unative_t addr)
{
    THREAD->arch.tls = addr;
    set_tls_desc(addr);

    return 0;
}

/** Acquire console back for kernel
 *
 */
void arch_grab_console(void)
{
#ifdef CONFIG_FB
    vesa_redraw();
#else
    ega_redraw();
#endif
}

/** Return console to userspace
 *
 */
void arch_release_console(void)
{
}

/** Construct function pointer
 *
 * @param fptr   function pointer structure
 * @param addr   function address
 * @param caller calling function address
 *
 * @return address of the function pointer
 *
 */
void *arch_construct_function(fncptr_t *fptr, void *addr, void *caller)
{
    return addr;
}

/** @}
 */