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