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  1. /*
  2.  * Copyright (C) 2005 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. #include <arch.h>
  30. #include <arch/ski/ski.h>
  31. #include <arch/drivers/it.h>
  32. #include <arch/interrupt.h>
  33. #include <arch/barrier.h>
  34. #include <arch/asm.h>
  35. #include <arch/register.h>
  36. #include <arch/types.h>
  37. #include <arch/context.h>
  38. #include <arch/mm/page.h>
  39. #include <mm/as.h>
  40. #include <config.h>
  41. #include <userspace.h>
  42. #include <console/console.h>
  43.  
  44. void arch_pre_mm_init(void)
  45. {
  46.     /* Set Interruption Vector Address (i.e. location of interruption vector table). */
  47.     iva_write((__address) &ivt);
  48.     srlz_d();
  49.    
  50.     ski_init_console();
  51.     it_init();
  52.     config.init_addr = INIT_ADDRESS;
  53.     config.init_size = INIT_SIZE;
  54. }
  55.  
  56. void arch_post_mm_init(void)
  57. {
  58. }
  59.  
  60. void arch_pre_smp_init(void)
  61. {
  62. }
  63.  
  64. void arch_post_smp_init(void)
  65. {
  66. }
  67.  
  68. /** Enter userspace and never return. */
  69. void userspace(void)
  70. {
  71.     psr_t psr;
  72.     rsc_t rsc;
  73.  
  74.     psr.value = psr_read();
  75.     psr.cpl = PL_USER;
  76.     psr.i = true;               /* start with interrupts enabled */
  77.     psr.ic = true;
  78.     psr.ri = 0;             /* start with instruction #0 */
  79.  
  80.     __asm__ volatile ("mov %0 = ar.rsc\n" : "=r" (rsc.value));
  81.     rsc.loadrs = 0;
  82.     rsc.be = false;
  83.     rsc.pl = PL_USER;
  84.     rsc.mode = 3;               /* eager mode */
  85.  
  86.     switch_to_userspace(UTEXT_ADDRESS, USTACK_ADDRESS+PAGE_SIZE-1, USTACK_ADDRESS, psr.value, rsc.value);
  87.  
  88.     while (1) {
  89.         ;
  90.     }
  91. }
  92.