reactos/ntoskrnl/ke/arm/boot.s

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/ke/arm/boot.s
   5  * PURPOSE:         Implements the kernel entry point for ARM machines
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9     .title "ARM Kernel Entry Point"
  10     .include "ntoskrnl/include/internal/arm/kxarm.h"
  11     .include "ntoskrnl/include/internal/arm/ksarm.h"
  12
  13     TEXTAREA
  14     NESTED_ENTRY KiSystemStartup
  15     PROLOG_END KiSystemStartup
  16
  17     //
  18     // Put us in FIQ mode
  19     //
  20     mrs r3, cpsr
  21     orr r3, r1, #CPSR_FIQ_MODE
  22     msr cpsr, r3
  23
  24     //
  25     // Set FIQ stack and registers
  26     //
  27     ldr sp, [a2, #LpbInterruptStack]
  28     mov r8, #0
  29     mov r9, #0
  30     mov r10, #0
  31
  32     //
  33     // Put us in ABORT mode
  34     //
  35     mrs r3, cpsr
  36     orr r3, r1, #CPSR_ABORT_MODE
  37     msr cpsr, r3
  38
  39     //
  40     // Set panic stack
  41     //
  42     ldr sp, [a2, #LpbPanicStack]
  43
  44     //
  45     // Put us in UND (Undefined) mode
  46     //
  47     mrs r3, cpsr
  48     orr r3, r1, #CPSR_UND_MODE
  49     msr cpsr, r3
  50
  51     //
  52     // Set panic stack
  53     //
  54     ldr sp, [a2, #LpbPanicStack]
  55
  56     //
  57     // Put us into SVC (Supervisor) mode
  58     //
  59     mrs r3, cpsr
  60     orr r3, r1, #CPSR_SVC_MODE
  61     msr cpsr, r3
  62
  63     //
  64     // Switch to boot kernel stack
  65     //
  66     ldr sp, [a2, #LpbKernelStack]
  67
  68     //
  69     // Go to C code
  70     //
  71     b KiInitializeSystem
  72
  73     ENTRY_END KiSystemStartup