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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/as.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. #include <arch/debugger.h>
  46.  
  47. #include <arch/asm/regname.h>
  48.  
  49. /* Size of the code jumping to the exception handler code
  50.  * - J+NOP
  51.  */
  52. #define EXCEPTION_JUMP_SIZE    8
  53.  
  54. #define TLB_EXC ((char *) 0x80000000)
  55. #define NORM_EXC ((char *) 0x80000180)
  56. #define CACHE_EXC ((char *) 0x80000100)
  57.  
  58. void arch_pre_mm_init(void)
  59. {
  60.     /* It is not assumed by default */
  61.     interrupts_disable();
  62.    
  63.     /* Initialize dispatch table */
  64.     exception_init();
  65.     interrupt_init();
  66.  
  67.     arc_init();
  68.  
  69.     /* Copy the exception vectors to the right places */
  70.     memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
  71.     memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
  72.     memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
  73.  
  74.     /*
  75.      * Switch to BEV normal level so that exception vectors point to the kernel.
  76.      * Clear the error level.
  77.      */
  78.     cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
  79.  
  80.     /*
  81.      * Mask all interrupts
  82.      */
  83.     cp0_mask_all_int();
  84.     /*
  85.      * Unmask hardware clock interrupt.
  86.      */
  87.     cp0_unmask_int(TIMER_IRQ);
  88.  
  89.     /*
  90.      * Start hardware clock.
  91.      */
  92.     cp0_compare_write(cp0_compare_value + cp0_count_read());
  93.  
  94.     console_init();
  95.     debugger_init();
  96.     /* Setup usermode...*/
  97.     config.init_addr = INIT_ADDRESS;
  98.     config.init_size = INIT_SIZE;
  99. }
  100.  
  101. void arch_post_mm_init(void)
  102. {
  103. }
  104.  
  105. void arch_pre_smp_init(void)
  106. {
  107. }
  108.  
  109. void arch_post_smp_init(void)
  110. {
  111. }
  112.  
  113. /* Stack pointer saved when entering user mode */
  114. /* TODO: How do we do it on SMP system???? */
  115.  
  116. /* Why the linker moves the variable 64K away in assembler
  117.  * when not in .text section ????????
  118.  */
  119. __address supervisor_sp __attribute__ ((section (".text")));
  120.  
  121. void userspace(void)
  122. {
  123.     /* EXL=1, UM=1, IE=1 */
  124.     cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
  125.                           cp0_status_um_bit |
  126.                           cp0_status_ie_enabled_bit));
  127.     cp0_epc_write(UTEXT_ADDRESS);
  128.     userspace_asm(USTACK_ADDRESS+PAGE_SIZE);
  129.     while (1)
  130.         ;
  131. }
  132.  
  133. void before_thread_runs_arch(void)
  134. {
  135.     supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  136. }
  137.