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/*

 * Copyright (c) 2007 Michal Kebrt

 * 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 arm32

 * @{

 */

/** @file

 */

#include <arch.h>

#include <arch/boot.h>

#include <config.h>

#include <arch/console.h>

#include <ddi/device.h>

#include <genarch/fb/fb.h>

#include <genarch/fb/visuals.h>

#include <ddi/irq.h>

#include <arch/debug_print/print.h>

#include <print.h>

#include <config.h>

#include <interrupt.h>

#include <arch/regutils.h>

#include <arch/drivers/gxemul.h>

#include <userspace.h>

bootinfo_t bootinfo;

// // uintptr_t supervisor_sp /*__attribute__ ((section (".text")))*/;

extern uintptr_t supervisor_sp;

//TODO: Remove include and move into exceptio.c

#include <arch/exception.h>

#include <syscall/syscall.h>

void tmp_swi_exception(int exc_no, istate_t* istate);

void tmp_swi_exception(int exc_no, istate_t* istate)

{

    ASSERT(exc_no == EXC_SWI);

    ASSERT(istate);

    // TODO: Alf ... remove aftet swi_exception is tested

    dprintf("\nSWI - istate dump input :\n");

    dprintf("    r0:%X    r1:%X    r2:%X    r3:%X\n", istate->r0,  istate->r1, istate->r2,  istate->r3);

    dprintf("    r4:%X    r5:%X    r6:%X    r7:%X\n", istate->r4,  istate->r5, istate->r6,  istate->r7);

    dprintf("    r8:%X    r8:%X   r10:%X   r11:%X\n", istate->r8,  istate->r9, istate->r10, istate->r11);

    dprintf("   r12:%X    r13:%X    lr:%X  spsr:%X\n", istate->r12, istate->sp, istate->lr,  istate->spsr);

//  dprintf("   prev_lr:%X    prev_sp:%X\n", istate->r12, istate->prev_lr, istate->prev_sp);

    // call kernel to serve syscall

    istate->r0 = syscall_handler(

        istate->r0,

        istate->r1,

        istate->r2,

        istate->r3,

        istate->r4);

    // TODO: Alf ... remove aftet swi_exception is tested

    dprintf("\nSWI - Istate dump after :\n");

    dprintf("    r0:%X    r1:%X    r2:%X    r3:%X\n", istate->r0,  istate->r1, istate->r2,  istate->r3);

    dprintf("    r4:%X    r5:%X    r6:%X    r7:%X\n", istate->r4,  istate->r5, istate->r6,  istate->r7);

    dprintf("    r8:%X    r8:%X   r10:%X   r11:%X\n", istate->r8,  istate->r9, istate->r10, istate->r11);

    dprintf("   r12:%X    r13:%X    lr:%X  spsr:%X\n", istate->r12, istate->sp, istate->lr,  istate->spsr);

//  dprintf("   prev_lr:%X    prev_sp:%X\n", istate->r12, istate->prev_lr, istate->prev_sp);

}

void arch_pre_main(void)

{

    int i;

    init.cnt = bootinfo.cnt;

    for (i = 0; i < bootinfo.cnt; ++i) {

        init.tasks[i].addr = bootinfo.tasks[i].addr;

        init.tasks[i].size = bootinfo.tasks[i].size;

    }

}

void arch_pre_mm_init(void)

{

    /* It is not assumed by default */

    interrupts_disable();

    setup_exception_stacks();

}

void prefetch_exception_generator(void);

void arch_post_mm_init(void)

{

    gxemul_hw_map_init();

    /* Initialize dispatch table */

    exception_init();

    interrupt_init();

    console_init(device_assign_devno());

    //fb_init(0x12000000, 640, 480, 1920, VISUAL_RGB_8_8_8);

    interrupts_enable();

}

void arch_post_cpu_init(void)

{

    /* TODO */

}

void arch_pre_smp_init(void)

{

    /* TODO */

}

void arch_post_smp_init(void)

{

    /* TODO */

}

/** Perform arm32 specific tasks needed before the new task is run. */

void before_task_runs_arch(void)

{

    /* TODO */

}

/** Perform arm32 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)

{

    /* TODO */

}

/** Struct to hold general purpose register values */

typedef struct {

    uint32_t r0;

    uint32_t r1;

    uint32_t r2;

    uint32_t r3;

    uint32_t r4;

    uint32_t r5;

    uint32_t r6;

    uint32_t r7;

    uint32_t r8;

    uint32_t r9;

    uint32_t r10;

    uint32_t r11;

    uint32_t r12;

    uint32_t sp;

    uint32_t lr;

    uint32_t pc;

} ustate_t;

void prefetch_exception_generator(void)  {

 asm __volatile__ (

    "ldr pc, =0x7000000"

 );

}

/** Change processor mode and jump into addres specified in

 *  kernel_uarg.uspace_entry

 * \param kernel_uarg information needed for correct setting of userspace

 */

void userspace(uspace_arg_t *kernel_uarg)

{

// WILL be changed .. after exception return .. eret will be done

/*

        volatile ustate_t ustate;

    dprintf("userspce krnl_uard  .uspace_uarg(%X), .uspace_entry(%X), .uspace_stack(%X)\n",

      (unsigned int)(kernel_uarg->uspace_uarg),

      kernel_uarg->uspace_entry,

      kernel_uarg->uspace_stack);

    // Step 1 ... prepare user space environmen

    // set first paramater

    ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg;

    // clear other registers

    ustate.r1 = ustate.r2  = ustate.r3  = ustate.r4  =

        ustate.r5 = ustate.r6  = ustate.r7  = ustate.r8  =

        ustate.r9 = ustate.r10 = ustate.r11 = ustate.r12 = 1;

        ustate.lr = 3;

        // set user stack

        ustate.sp = ((uint32_t)kernel_uarg->uspace_stack)+PAGE_SIZE;

        // set where uspace executin starts

        ustate.pc = (uintptr_t) kernel_uarg->uspace_entry;

    // status register in user mode

    ipl_t cpsr = current_status_reg_read();

        cpsr &= ~STATUS_REG_MODE_MASK | USER_MODE;

    //

    ipl_t tmpsr = (cpsr & ~STATUS_REG_MODE_MASK) | ABORT_MODE;

    asm __volatile__ (

        "mov r0, %0        \n" // save pointer into ustate struct

        "mov r1, %1        \n" // save cspr

        "msr cpsr_c, %2    \n" // change mode into any exception mode

        "msr spsr_c, r1    \n" // set saved cpsr ... as user mode

        "ldmfd r0, {r0-r12, sp, lr, pc}^\n" // jump into user mode

    : // no output

    : "r"(&ustate), "r"(cpsr), "r"(tmpsr) //

    : "r0","r1"

    );

*/

    while(1)

        ;

}

/** @}

 */