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/*
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 * Copyright (C) 2003-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch.h>
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#include <arch/cp0.h>
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#include <arch/exception.h>
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#include <arch/asm.h>
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#include <mm/as.h>
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#include <userspace.h>
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#include <arch/console.h>
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#include <memstr.h>
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#include <proc/thread.h>
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#include <proc/uarg.h>
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#include <print.h>
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#include <syscall/syscall.h>
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#include <arch/interrupt.h>
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#include <arch/drivers/arc.h>
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#include <console/chardev.h>
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#include <arch/debugger.h>
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#include <genarch/fb/fb.h>
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#include <arch/asm/regname.h>
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/* Size of the code jumping to the exception handler code 
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 * - J+NOP 
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 */
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#define EXCEPTION_JUMP_SIZE    8
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#define TLB_EXC ((char *) 0x80000000)
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#define NORM_EXC ((char *) 0x80000180)
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#define CACHE_EXC ((char *) 0x80000100)
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void arch_pre_main(void)
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{
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	/* Setup usermode */
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	init.cnt = 4;
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	init.tasks[0].addr = INIT_ADDRESS;
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	init.tasks[0].size = INIT_SIZE;
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	init.tasks[1].addr = INIT_ADDRESS + 0x100000;
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	init.tasks[1].size = INIT_SIZE;
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	init.tasks[2].addr = INIT_ADDRESS + 0x200000;
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	init.tasks[2].size = INIT_SIZE;
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	init.tasks[3].addr = INIT_ADDRESS + 0x300000;
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	init.tasks[3].size = INIT_SIZE;
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}
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void arch_pre_mm_init(void)
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{
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	/* It is not assumed by default */
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	interrupts_disable();
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	/* Initialize dispatch table */
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	exception_init();
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	arc_init();
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	/* Copy the exception vectors to the right places */
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	memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
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	memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
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	memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
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	interrupt_init();
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	/*
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	 * Switch to BEV normal level so that exception vectors point to the kernel.
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	 * Clear the error level.
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	 */
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	cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
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	/* 
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	 * Mask all interrupts 
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	 */
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	cp0_mask_all_int();
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	/*
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	 * Unmask hardware clock interrupt.
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	 */
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	cp0_unmask_int(TIMER_IRQ);
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	console_init();
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	debugger_init();
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}
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void arch_post_mm_init(void)
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{
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#ifdef CONFIG_FB
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		fb_init(0x12000000, 640, 480, 24, 1920); // gxemul framebuffer
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#endif
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}
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void arch_pre_smp_init(void)
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{
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}
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void arch_post_smp_init(void)
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{
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}
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/* Stack pointer saved when entering user mode */
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/* TODO: How do we do it on SMP system???? */
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/* Why the linker moves the variable 64K away in assembler
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 * when not in .text section ????????
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 */
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__address supervisor_sp __attribute__ ((section (".text")));
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void userspace(uspace_arg_t *kernel_uarg)
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{
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	/* EXL=1, UM=1, IE=1 */
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	cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
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					      cp0_status_um_bit |
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					      cp0_status_ie_enabled_bit));
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	cp0_epc_write((__address) kernel_uarg->uspace_entry);
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	userspace_asm(((__address) kernel_uarg->uspace_stack+PAGE_SIZE), 
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		      (__address) kernel_uarg->uspace_uarg,
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		      (__address) kernel_uarg->uspace_entry);
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	while (1)
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		;
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}
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/** Perform mips32 specific tasks needed before the new task is run. */
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void before_task_runs_arch(void)
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{
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}
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/** Perform mips32 specific tasks needed before the new thread is scheduled. */
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void before_thread_runs_arch(void)
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{
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	supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
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}
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void after_thread_ran_arch(void)
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{
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}
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/** Set thread-local-storage pointer
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 *
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 * We have it currently in K1, it is
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 * possible to have it separately in the future.
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 */
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__native sys_tls_set(__native addr)
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{
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	return 0;
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}