reactos/ntoskrnl/ke/arm/boot.s

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         BSD - See COPYING.ARM 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     b .
  21     mrs r3, cpsr
  22     orr r3, r1, #CPSR_FIQ_MODE
  23     msr cpsr, r3
  24
  25     //
  26     // Set FIQ stack and registers
  27     //
  28     ldr sp, [a2, #LpbInterruptStack]
  29     mov r8, #0
  30     mov r9, #0
  31     mov r10, #0
  32
  33     //
  34     // Put us in ABORT mode
  35     //
  36     mrs r3, cpsr
  37     orr r3, r1, #CPSR_ABORT_MODE
  38     msr cpsr, r3
  39
  40     //
  41     // Set panic stack
  42     //
  43     ldr sp, [a2, #LpbPanicStack]
  44
  45     //
  46     // Put us in UND (Undefined) mode
  47     //
  48     mrs r3, cpsr
  49     orr r3, r1, #CPSR_UND_MODE
  50     msr cpsr, r3
  51
  52     //
  53     // Set panic stack
  54     //
  55     ldr sp, [a2, #LpbPanicStack]
  56
  57     //
  58     // Put us into SVC (Supervisor) mode
  59     //
  60     mrs r3, cpsr
  61     orr r3, r1, #CPSR_SVC_MODE
  62     msr cpsr, r3
  63
  64     //
  65     // Switch to boot kernel stack
  66     //
  67     ldr sp, [a2, #LpbKernelStack]
  68
  69     //
  70     // Go to C code
  71     //
  72     b KiInitializeSystem
  73
  74     ENTRY_END KiSystemStartup