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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.  
  45. #include <arch/debug_print/print.h>
  46. #include <print.h>
  47. #include <config.h>
  48. #include <interrupt.h>
  49. #include <arch/regutils.h>
  50. //#include <arch/drivers/init.h>
  51. #include <userspace.h>
  52. bootinfo_t bootinfo;
  53.  
  54. //TODO: Remove include and move into exceptio.c
  55. #include <arch/exception.h>
  56.  
  57. #include <syscall/syscall.h>
  58. static void tmp_swi_exception(int exc_no, istate_t* istate)
  59. {
  60.     ASSERT(exc_no == EXC_SWI);
  61.     ASSERT(istate);
  62.     // TODO: Alf ... remove aftet swi_exception is tested
  63.     dprintf("\nSWI - istate dump input :\n");
  64.     dprintf("    r0:%X    r1:%X    r2:%X    r3:%X\n", istate->r0,  istate->r1, istate->r2,  istate->r3);
  65.     dprintf("    r4:%X    r5:%X    r6:%X    r7:%X\n", istate->r4,  istate->r5, istate->r6,  istate->r7);
  66.     dprintf("    r8:%X    r8:%X   r10:%X   r11:%X\n", istate->r8,  istate->r9, istate->r10, istate->r11);
  67.     dprintf("   r12:%X    r13:%X    lr:%X  spsr:%X\n", istate->r12, istate->sp, istate->lr,  istate->spsr);
  68.     dprintf("   prev_lr:%X    prev_sp:%X\n", istate->r12, istate->prev_lr, istate->prev_sp);
  69.     // call kernel to serve syscall
  70.     istate->r0 = syscall_handler(
  71.         istate->r0,
  72.         istate->r1,
  73.         istate->r2,
  74.         istate->r3,
  75.         istate->r4);
  76.  
  77.     // TODO: Alf ... remove aftet swi_exception is tested
  78.     dprintf("\nSWI - Istate dump after :\n");
  79.     dprintf("    r0:%X    r1:%X    r2:%X    r3:%X\n", istate->r0,  istate->r1, istate->r2,  istate->r3);
  80.     dprintf("    r4:%X    r5:%X    r6:%X    r7:%X\n", istate->r4,  istate->r5, istate->r6,  istate->r7);
  81.     dprintf("    r8:%X    r8:%X   r10:%X   r11:%X\n", istate->r8,  istate->r9, istate->r10, istate->r11);
  82.     dprintf("   r12:%X    r13:%X    lr:%X  spsr:%X\n", istate->r12, istate->sp, istate->lr,  istate->spsr);
  83.     dprintf("   prev_lr:%X    prev_sp:%X\n", istate->r12, istate->prev_lr, istate->prev_sp);
  84. }
  85.  
  86.  
  87. void arch_pre_main(void)
  88. {
  89.     dprintf("arch_pre_main\n");
  90.     int i;
  91.  
  92.     init.cnt = bootinfo.cnt;
  93.  
  94.     for (i = 0; i < bootinfo.cnt; ++i) {
  95.         init.tasks[i].addr = bootinfo.tasks[i].addr;
  96.         init.tasks[i].size = bootinfo.tasks[i].size;
  97.     }
  98.  
  99.     /* TODO this code just setups irq testing bed */
  100.     setup_exception_stacks();
  101. }
  102.  
  103. void arch_pre_mm_init(void)
  104. {
  105.     dprintf("arch_pre_mm_init\n");
  106.  
  107.     /* It is not assumed by default */
  108.     interrupts_disable();
  109.    
  110. }
  111.  
  112. void prefetch_exception_generator(void);
  113.  
  114. void arch_post_mm_init(void)
  115. {
  116.     dprintf("arch_post_mm_init start()\n");
  117.     /* Initialize dispatch table
  118.        Note: Have to be after page_init() */
  119.     exception_init();
  120.  
  121. //  drivers_init();
  122.     interrupt_init();
  123.    
  124. //  console_init(device_assign_devno());
  125.     //fb_init(0x12000000, 640, 480, 1920, VISUAL_RGB_8_8_8);
  126.    
  127. //  interrupts_enable();
  128. //  asm __volatile__ ("ldr pc, =0x70000000"); // prefetch exception
  129.     //while(1);
  130. /*
  131.     uspace_arg_t uspace;
  132.     uspace.uspace_entry = (void*)prefetch_exception_generator;
  133.     uspace.uspace_stack = (void*)0x6000000;
  134.         uspace.uspace_uarg  = &uspace;
  135.    
  136.     userspace(&uspace);
  137. */
  138.     dprintf("arch_post_mm_init end()\n");
  139. }
  140.  
  141. void arch_post_cpu_init(void)
  142. {
  143.     /* TODO */
  144. }
  145.  
  146. void arch_pre_smp_init(void)
  147. {
  148.     /* TODO */
  149. }
  150.  
  151. void arch_post_smp_init(void)
  152. {
  153.     /* TODO */
  154. }
  155.  
  156. /** Perform arm32 specific tasks needed before the new task is run. */
  157. void before_task_runs_arch(void)
  158. {
  159.     /* TODO */
  160. }
  161.  
  162. /** Perform arm32 specific tasks needed before the new thread is scheduled. */
  163. void before_thread_runs_arch(void)
  164. {
  165.     /* TODO */
  166. }
  167.  
  168. void after_thread_ran_arch(void)
  169. {
  170.     /* TODO */
  171. }
  172.  
  173. /** Struct to hold general purpose register values */
  174. typedef struct {
  175.     uint32_t r0;
  176.     uint32_t r1;
  177.     uint32_t r2;
  178.     uint32_t r3;
  179.     uint32_t r4;
  180.     uint32_t r5;
  181.     uint32_t r6;
  182.     uint32_t r7;
  183.     uint32_t r8;
  184.     uint32_t r9;
  185.     uint32_t r10;
  186.     uint32_t r11;
  187.     uint32_t r12;
  188.     uint32_t sp;
  189.     uint32_t lr;
  190.     uint32_t pc;
  191. } ustate_t;
  192.  
  193.  
  194. void prefetch_exception_generator(void)  {
  195.  asm __volatile__ (
  196.     "ldr pc, =0x7000000"
  197.  );
  198.  
  199. }
  200.  
  201. /** Change processor mode and jump into addres specified in
  202.  *  kernel_uarg.uspace_entry
  203.  * \param kernel_uarg information needed for correct setting of userspace
  204.  */
  205. void userspace(uspace_arg_t *kernel_uarg)
  206. {
  207. // WILL be changed .. after exception return .. eret will be done
  208. /*
  209.         volatile ustate_t ustate;
  210.     dprintf("userspce krnl_uard  .uspace_uarg(%X), .uspace_entry(%X), .uspace_stack(%X)\n",
  211.       (unsigned int)(kernel_uarg->uspace_uarg),
  212.       kernel_uarg->uspace_entry,
  213.       kernel_uarg->uspace_stack);
  214.     // Step 1 ... prepare user space environmen
  215.     // set first paramater
  216.     ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg;
  217.     // clear other registers
  218.     ustate.r1 = ustate.r2  = ustate.r3  = ustate.r4  =
  219.         ustate.r5 = ustate.r6  = ustate.r7  = ustate.r8  =
  220.         ustate.r9 = ustate.r10 = ustate.r11 = ustate.r12 = 1;
  221.         ustate.lr = 3;
  222.         // set user stack
  223.         ustate.sp = ((uint32_t)kernel_uarg->uspace_stack)+PAGE_SIZE;
  224.         // set where uspace executin starts
  225.         ustate.pc = (uintptr_t) kernel_uarg->uspace_entry;
  226.  
  227.     // status register in user mode
  228.     ipl_t cpsr = current_status_reg_read();
  229.         cpsr &= ~STATUS_REG_MODE_MASK | USER_MODE;
  230.     //
  231.     ipl_t tmpsr = (cpsr & ~STATUS_REG_MODE_MASK) | ABORT_MODE;
  232.  
  233.     asm __volatile__ (
  234.         "mov r0, %0        \n" // save pointer into ustate struct
  235.         "mov r1, %1        \n" // save cspr
  236.         "msr cpsr_c, %2    \n" // change mode into any exception mode
  237.         "msr spsr_c, r1    \n" // set saved cpsr ... as user mode
  238.         "ldmfd r0, {r0-r12, sp, lr, pc}^\n" // jump into user mode
  239.     : // no output
  240.     : "r"(&ustate), "r"(cpsr), "r"(tmpsr) //
  241.     : "r0","r1"
  242.     );
  243.  
  244.     while(1)
  245.         ;
  246.         */
  247.        
  248. }
  249. /** @}
  250.  */
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