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  1. /*
  2.  * Copyright (c) 2007 Michal Kebrt
  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. /** @addtogroup arm32
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35.  
  36. #include <arch.h>
  37. #include <arch/boot.h>
  38. #include <config.h>
  39. #include <arch/console.h>
  40. #include <ddi/device.h>
  41. #include <genarch/fb/fb.h>
  42. #include <genarch/fb/visuals.h>
  43. #include <ddi/irq.h>
  44. #include <arch/debug/print.h>
  45. #include <print.h>
  46. #include <config.h>
  47. #include <interrupt.h>
  48. #include <arch/regutils.h>
  49. #include <arch/machine.h>
  50. #include <userspace.h>
  51.  
  52. bootinfo_t bootinfo;
  53. // // uintptr_t supervisor_sp /*__attribute__ ((section (".text")))*/;
  54. extern uintptr_t supervisor_sp;
  55.  
  56.  
  57. void arch_pre_main(void)
  58. {
  59.     int i;
  60.  
  61.     init.cnt = bootinfo.cnt;
  62.  
  63.     for (i = 0; i < bootinfo.cnt; ++i) {
  64.         init.tasks[i].addr = bootinfo.tasks[i].addr;
  65.         init.tasks[i].size = bootinfo.tasks[i].size;
  66.     }
  67.    
  68. }
  69.  
  70.  
  71. void arch_pre_mm_init(void)
  72. {
  73.     /* It is not assumed by default */
  74.     interrupts_disable();
  75.  
  76.     setup_exception_stacks();
  77. }
  78.  
  79.  
  80. void arch_post_mm_init(void)
  81. {
  82.     machine_hw_map_init();
  83.  
  84.     /* Initialize dispatch table */
  85.     exception_init();
  86.  
  87.     interrupt_init();
  88.    
  89.     console_init(device_assign_devno());
  90. }
  91.  
  92.  
  93. void arch_post_cpu_init(void)
  94. {
  95. }
  96.  
  97.  
  98. void arch_pre_smp_init(void)
  99. {
  100.     /* TODO */
  101. }
  102.  
  103.  
  104. void arch_post_smp_init(void)
  105. {
  106.     /* TODO */
  107. }
  108.  
  109.  
  110. /** Perform arm32 specific tasks needed before the new task is run. */
  111. void before_task_runs_arch(void)
  112. {
  113.     tlb_invalidate_all();
  114. }
  115.  
  116.  
  117. /** Perform arm32 specific tasks needed before the new thread is scheduled. */
  118. void before_thread_runs_arch(void)
  119. {
  120.     supervisor_sp = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  121. }
  122.  
  123.  
  124. void after_thread_ran_arch(void)
  125. {
  126. }
  127.  
  128.  
  129. /** Struct to hold general purpose register values */
  130. typedef struct {
  131.     uint32_t r0;
  132.     uint32_t r1;
  133.     uint32_t r2;
  134.     uint32_t r3;
  135.     uint32_t r4;
  136.     uint32_t r5;
  137.     uint32_t r6;
  138.     uint32_t r7;
  139.     uint32_t r8;
  140.     uint32_t r9;
  141.     uint32_t r10;
  142.     uint32_t r11;
  143.     uint32_t r12;
  144.     uint32_t sp;
  145.     uint32_t lr;
  146.     uint32_t pc;
  147. } ustate_t;
  148.  
  149.  
  150. /** Changes processor mode and jumps to the address specified in the first parameter.
  151.  *
  152.  *  @param kernel_uarg   Userspace settings (entry point, stack, ...).
  153.  */
  154. void userspace(uspace_arg_t *kernel_uarg)
  155. {
  156.     dprintf("Userspace:  .uspace_uarg(%X), .uspace_entry(%X), .uspace_stack(%X)\n",
  157.         (unsigned int)(kernel_uarg->uspace_uarg), kernel_uarg->uspace_entry,
  158.         kernel_uarg->uspace_stack);
  159.  
  160.     volatile ustate_t ustate;
  161.  
  162.     // set first parameter
  163.     ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg;
  164.  
  165.     // clear other registers
  166.     ustate.r1 = ustate.r2  = ustate.r3  = ustate.r4  =
  167.         ustate.r5 = ustate.r6  = ustate.r7  = ustate.r8  =
  168.         ustate.r9 = ustate.r10 = ustate.r11 = ustate.r12 = 1;
  169.  
  170.     ustate.lr = 3;
  171.  
  172.     //set user stack
  173.     ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) +
  174.             PAGE_SIZE - sizeof(void*);
  175.     //on the bottom of stack there is pointer to TLS
  176.    
  177.     //set where uspace execution starts
  178.     ustate.pc = (uintptr_t) kernel_uarg->uspace_entry;
  179.  
  180.     //status register in user mode
  181.     ipl_t cpsr = current_status_reg_read();
  182.     cpsr &= ~STATUS_REG_MODE_MASK | USER_MODE;
  183.    
  184.     ipl_t tmpsr = (cpsr & ~STATUS_REG_MODE_MASK) | SUPERVISOR_MODE;
  185.  
  186.     asm __volatile__ (
  187.         // save pointer into ustate struct
  188.         "mov r0, %0         \n"
  189.         // save cspr
  190.         "mov r1, %1         \n"
  191.         // change mode into any exception mode
  192.         "msr cpsr_c, %2         \n"
  193.         // set saved cpsr
  194.         "msr spsr_c, r1 \n"
  195.  
  196.         "mov sp, r0 \n"
  197.         // replace almost all registers
  198.         "ldmfd sp!, {r0-r12, sp, lr}^\n"
  199.         //jump to the usermode
  200.         "ldmfd sp!, {pc}^"
  201.     : // no output
  202.     : "r"(&ustate), "r"(cpsr), "r"(tmpsr) //
  203.     : "r0","r1"
  204.     );
  205.  
  206.     while(1) ;
  207. }
  208.  
  209.  
  210. void cpu_halt(void)
  211. {
  212.     machine_cpu_halt();
  213. }
  214.  
  215. /** @}
  216.  */
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