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  1. /*
  2.  * Copyright (C) 2003-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29.  
  30. #include <arch.h>
  31. #include <arch/cp0.h>
  32. #include <arch/exception.h>
  33. #include <arch/asm.h>
  34. #include <mm/vm.h>
  35.  
  36. #include <userspace.h>
  37. #include <arch/console.h>
  38. #include <memstr.h>
  39. #include <proc/thread.h>
  40. #include <print.h>
  41.  
  42. #include <arch/interrupt.h>
  43. #include <arch/drivers/arc.h>
  44. #include <console/chardev.h>
  45.  
  46. #include <arch/asm/regname.h>
  47.  
  48. /* Size of the code jumping to the exception handler code
  49.  * - J+NOP
  50.  */
  51. #define EXCEPTION_JUMP_SIZE    8
  52.  
  53. #define TLB_EXC ((char *) 0x80000000)
  54. #define NORM_EXC ((char *) 0x80000180)
  55. #define CACHE_EXC ((char *) 0x80000100)
  56.  
  57. void arch_pre_mm_init(void)
  58. {
  59.     /* It is not assumed by default */
  60.     interrupts_disable();
  61.    
  62.     /* Initialize dispatch table */
  63.     interrupt_init();
  64.  
  65.     arc_init();
  66.  
  67.     /* Copy the exception vectors to the right places */
  68.     memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
  69.     memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
  70.     memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
  71.  
  72.     /*
  73.      * Switch to BEV normal level so that exception vectors point to the kernel.
  74.      * Clear the error level.
  75.      */
  76.     cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
  77.  
  78.     /*
  79.      * Mask all interrupts
  80.      */
  81.     cp0_mask_all_int();
  82.     /*
  83.      * Unmask hardware clock interrupt.
  84.      */
  85.     cp0_unmask_int(TIMER_IRQ);
  86.  
  87.     /*
  88.      * Start hardware clock.
  89.      */
  90.     cp0_compare_write(cp0_compare_value + cp0_count_read());
  91.  
  92.     console_init();
  93.     arc_print_memory_map();
  94.     arc_print_devices();
  95. }
  96.  
  97. void arch_post_mm_init(void)
  98. {
  99. }
  100.  
  101. void arch_pre_smp_init(void)
  102. {
  103. }
  104.  
  105. void arch_post_smp_init(void)
  106. {
  107. }
  108.  
  109. void userspace(void)
  110. {
  111.     /* EXL=1, UM=1, IE=1 */
  112.     cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
  113.                           cp0_status_um_bit |
  114.                           cp0_status_ie_enabled_bit));
  115.    
  116.     cp0_epc_write(UTEXT_ADDRESS);
  117.     userspace_asm(USTACK_ADDRESS+PAGE_SIZE);
  118.     while (1)
  119.         ;
  120. }
  121.  
  122. /* Stack pointer saved when entering user mode */
  123. /* TODO: How do we do it on SMP system???? */
  124. __address supervisor_sp;
  125.  
  126. void before_thread_runs_arch(void)
  127. {
  128.     supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  129. }
  130.