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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.

 */

#include <arch.h>

#include <arch/cp0.h>

#include <arch/exception.h>

#include <arch/asm.h>

#include <mm/as.h>

#include <userspace.h>

#include <arch/console.h>

#include <memstr.h>

#include <proc/thread.h>

#include <proc/uarg.h>

#include <print.h>

#include <syscall/syscall.h>

#include <arch/interrupt.h>

#include <arch/drivers/arc.h>

#include <console/chardev.h>

#include <arch/debugger.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)

void arch_pre_mm_init(void)

{

    /* It is not assumed by default */

    interrupts_disable();

    /* Initialize dispatch table */

    exception_init();

    interrupt_init();

    arc_init();

    /* Copy the exception vectors to the right places */

    memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);

    memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);

    memcpy(CACHE_EXC, (char *)cache_error_entry, 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();

    /*

     * Unmask hardware clock interrupt.

     */

    cp0_unmask_int(TIMER_IRQ);

    /*

     * Start hardware clock.

     */

    cp0_compare_write(cp0_compare_value + cp0_count_read());

    console_init();

    debugger_init();

    /* Setup usermode */

    init.cnt = 1;

    init.tasks[0].addr = INIT_ADDRESS;

    init.tasks[0].size = INIT_SIZE;

}

void arch_post_mm_init(void)

{

}

void arch_pre_smp_init(void)

{

}

void arch_post_smp_init(void)

{

}

/* Stack pointer saved when entering user mode */

/* TODO: How do we do it on SMP system???? */

/* Why the linker moves the variable 64K away in assembler

 * when not in .text section ????????

 */

__address supervisor_sp __attribute__ ((section (".text")));

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((__address) kernel_uarg->uspace_entry);

    userspace_asm(((__address) kernel_uarg->uspace_stack+PAGE_SIZE),

              (__address) kernel_uarg->uspace_uarg,

              (__address) kernel_uarg->uspace_entry);

    while (1)

        ;

}

void before_thread_runs_arch(void)

{

    supervisor_sp = (__address) &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.

 */

__native sys_tls_set(__native addr)

{

    return 0;

}