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/*
 * Copyright (c) 2003-2004 Jakub Jermar
 * 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 mips32
 * @{
 */
/** @file
 */

#include <arch.h>
#include <arch/cp0.h>
#include <arch/exception.h>
#include <mm/as.h>
#include <userspace.h>
#include <memstr.h>
#include <proc/thread.h>
#include <proc/uarg.h>
#include <print.h>
#include <console/console.h>
#include <syscall/syscall.h>
#include <sysinfo/sysinfo.h>
#include <arch/interrupt.h>
#include <console/chardev.h>
#include <arch/barrier.h>
#include <arch/debugger.h>
#include <genarch/fb/fb.h>
#include <genarch/fb/visuals.h>
#include <genarch/drivers/dsrln/dsrlnin.h>
#include <genarch/drivers/dsrln/dsrlnout.h>
#include <genarch/srln/srln.h>
#include <macros.h>
#include <config.h>
#include <string.h>
#include <arch/drivers/msim.h>
#include <arch/asm/regname.h>

/* Size of the code jumping to the exception handler code
 * - J+NOP
 */
#define EXCEPTION_JUMP_SIZE  8

#define TLB_EXC    ((char *) 0x80000000)
#define NORM_EXC   ((char *) 0x80000180)
#define CACHE_EXC  ((char *) 0x80000100)


/* Why the linker moves the variable 64K away in assembler
 * when not in .text section?
 */

/* Stack pointer saved when entering user mode */
uintptr_t supervisor_sp __attribute__ ((section (".text")));

size_t cpu_count = 0;

/** Performs mips32-specific initialization before main_bsp() is called. */
void arch_pre_main(void *entry __attribute__((unused)), bootinfo_t *bootinfo)
{
    /* Setup usermode */
    init.cnt = bootinfo->cnt;
    
    size_t i;
    for (i = 0; i < min3(bootinfo->cnt, TASKMAP_MAX_RECORDS, CONFIG_INIT_TASKS); i++) {
        init.tasks[i].addr = bootinfo->tasks[i].addr;
        init.tasks[i].size = bootinfo->tasks[i].size;
        str_cpy(init.tasks[i].name, CONFIG_TASK_NAME_BUFLEN,
            bootinfo->tasks[i].name);
    }
    
    for (i = 0; i < CPUMAP_MAX_RECORDS; i++) {
        if ((bootinfo->cpumap & (1 << i)) != 0)
            cpu_count++;
    }
}

void arch_pre_mm_init(void)
{
    /* It is not assumed by default */
    interrupts_disable();
    
    /* Initialize dispatch table */
    exception_init();

    /* Copy the exception vectors to the right places */
    memcpy(TLB_EXC, (char *) tlb_refill_entry, EXCEPTION_JUMP_SIZE);
    smc_coherence_block(TLB_EXC, EXCEPTION_JUMP_SIZE);
    memcpy(NORM_EXC, (char *) exception_entry, EXCEPTION_JUMP_SIZE);
    smc_coherence_block(NORM_EXC, EXCEPTION_JUMP_SIZE);
    memcpy(CACHE_EXC, (char *) cache_error_entry, EXCEPTION_JUMP_SIZE);
    smc_coherence_block(CACHE_EXC, EXCEPTION_JUMP_SIZE);
    
    /*
     * Switch to BEV normal level so that exception vectors point to the
     * kernel. Clear the error level.
     */
    cp0_status_write(cp0_status_read() &
        ~(cp0_status_bev_bootstrap_bit | cp0_status_erl_error_bit));
    
    /*
     * Mask all interrupts
     */
    cp0_mask_all_int();
    
    debugger_init();
}

void arch_post_mm_init(void)
{
    interrupt_init();
    
#ifdef CONFIG_FB
    /* GXemul framebuffer */
    fb_properties_t gxemul_prop = {
        .addr = 0x12000000,
        .offset = 0,
        .x = 640,
        .y = 480,
        .scan = 1920,
        .visual = VISUAL_RGB_8_8_8,
    };
    fb_init(&gxemul_prop);
#else
#ifdef CONFIG_MIPS_PRN
    dsrlnout_init((ioport8_t *) MSIM_KBD_ADDRESS);
#endif /* CONFIG_MIPS_PRN */
#endif /* CONFIG_FB */
}

void arch_post_cpu_init(void)
{
}

void arch_pre_smp_init(void)
{
}

void arch_post_smp_init(void)
{
#ifdef CONFIG_MIPS_KBD
    /*
     * Initialize the msim/GXemul keyboard port. Then initialize the serial line
     * module and connect it to the msim/GXemul keyboard. Enable keyboard interrupts.
     */
    dsrlnin_instance_t *dsrlnin_instance
        = dsrlnin_init((dsrlnin_t *) MSIM_KBD_ADDRESS, MSIM_KBD_IRQ);
    if (dsrlnin_instance) {
        srln_instance_t *srln_instance = srln_init();
        if (srln_instance) {
            indev_t *sink = stdin_wire();
            indev_t *srln = srln_wire(srln_instance, sink);
            dsrlnin_wire(dsrlnin_instance, srln);
            cp0_unmask_int(MSIM_KBD_IRQ);
        }
    }
    
    /*
     * 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.inr", NULL, MSIM_KBD_IRQ);
    sysinfo_set_item_val("kbd.address.virtual", NULL, MSIM_KBD_ADDRESS);
#endif
}

void calibrate_delay_loop(void)
{
}

void userspace(uspace_arg_t *kernel_uarg)
{
    /* EXL = 1, UM = 1, IE = 1 */
    cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
        cp0_status_um_bit | cp0_status_ie_enabled_bit));
    cp0_epc_write((uintptr_t) kernel_uarg->uspace_entry);
    userspace_asm(((uintptr_t) kernel_uarg->uspace_stack + PAGE_SIZE), 
        (uintptr_t) kernel_uarg->uspace_uarg,
        (uintptr_t) kernel_uarg->uspace_entry);
    
    while (1);
}

/** Perform mips32 specific tasks needed before the new task is run. */
void before_task_runs_arch(void)
{
}

/** Perform mips32 specific tasks needed before the new thread is scheduled. */
void before_thread_runs_arch(void)
{
    supervisor_sp = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
        SP_DELTA];
}

void after_thread_ran_arch(void)
{
}

/** Set thread-local-storage pointer
 *
 * We have it currently in K1, it is
 * possible to have it separately in the future.
 */
unative_t sys_tls_set(unative_t addr)
{
    return 0;
}

void arch_reboot(void)
{
    ___halt();
    while (1);
}

/** 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;
}

void arch_grab_console(void)
{
#ifdef CONFIG_FB
    fb_redraw();
#endif
}

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

/** @}
 */