reactos/boot/freeldr/freeldr/arch/arm/boot.s

   1 /*
   2  * PROJECT:         ReactOS Boot Loader
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            boot/freeldr/arch/arm/boot.s
   5  * PURPOSE:         Implements the entry point for ARM machines
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9     .title "ARM FreeLDR Entry Point"
  10     .include "ntoskrnl/include/internal/arm/kxarm.h"
  11     .include "ntoskrnl/include/internal/arm/ksarm.h"
  12
  13     NESTED_ENTRY _start
  14     PROLOG_END _start
  15
  16     //
  17     // C entrypoint
  18     //
  19     ldr lr, L_ArmInit
  20
  21     //
  22     // Turn off FIQs and IRQs
  23     // FreeLDR runs without interrupts, and without paging, just like on x86
  24     //
  25     mrs r1, cpsr
  26     orr r1, r1, #CPSR_IRQ_DISABLE | CPSR_FIQ_DISABLE
  27     msr cpsr, r1
  28
  29     //
  30     // Turn off caches and the MMU
  31     //
  32     mrc p15, 0, r1, c1, c0, 0
  33     bic r1, r1, #C1_DCACHE_CONTROL
  34     bic r1, r1, #C1_ICACHE_CONTROL
  35     bic r1, r1, #C1_MMU_CONTROL
  36     mcr p15, 0, r1, c1, c0, 0
  37
  38     //
  39     // Flush everything away
  40     //
  41     mov r1, #0
  42     mcr p15, 0, r1, c7, c7, 0
  43
  44     //
  45     // Okay, now give us a stack
  46     //
  47     //ldr sp, L_BootStackEnd
  48
  49     //
  50     // Go ahead and call the C initialization code
  51     // r0 contains the ARM_BOARD_CONFIGURATION_DATA structure
  52     //
  53     bx lr
  54     ENTRY_END _start
  55
  56 L_BootStackEnd:
  57     .long BootStackEnd
  58
  59 L_ArmInit:
  60     .long ArmInit
  61
  62 .section pagedata
  63 .global TranslationTableStart
  64 TranslationTableStart:
  65
  66 .global ArmTranslationTable
  67 ArmTranslationTable:
  68     .space 0x4000 // 0x00000000->0xFFFFFFFF
  69
  70 .global BootTranslationTable
  71 BootTranslationTable:
  72     .space 0x0400 // 0x00000000->0x800FFFFF
  73     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  74     .space 0x0400 // 0x00100000->0x801FFFFF
  75     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  76     .space 0x0400 // 0x00200000->0x802FFFFF
  77     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  78     .space 0x0400 // 0x00300000->0x803FFFFF
  79     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  80     .space 0x0400 // 0x00400000->0x804FFFFF
  81     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  82     .space 0x0400 // 0x00500000->0x805FFFFF
  83     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  84     .space 0x0400 // 0x00600000->0x806FFFFF
  85     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  86     .space 0x0400 // 0x00700000->0x807FFFFF
  87     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  88
  89 .global KernelTranslationTable
  90 KernelTranslationTable:
  91     .space 0x0400 // 0x00800000->0x808FFFFF
  92     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  93     .space 0x0400 // 0x00900000->0x809FFFFF
  94     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  95     .space 0x0400 // 0x00A00000->0x80AFFFFF
  96     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  97     .space 0x0400 // 0x00B00000->0x80BFFFFF
  98     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
  99     .space 0x0400 // 0x00C00000->0x80CFFFFF
 100     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 101     .space 0x0400 // 0x00D00000->0x80DFFFFF
 102     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 103
 104 .global FlatMapTranslationTable
 105 FlatMapTranslationTable:
 106     .space 0x0400 // 0xYYYYYYYY->0xC00FFFFF
 107     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 108     .space 0x0400 // 0xYYYYYYYY->0xC01FFFFF
 109     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 110     .space 0x0400 // 0xYYYYYYYY->0xC02FFFFF
 111     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 112     .space 0x0400 // 0xYYYYYYYY->0xC03FFFFF
 113     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 114     .space 0x0400 // 0xYYYYYYYY->0xC04FFFFF
 115     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 116     .space 0x0400 // 0xYYYYYYYY->0xC05FFFFF
 117     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 118     .space 0x0400 // 0xYYYYYYYY->0xC06FFFFF
 119     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 120     .space 0x0400 // 0xYYYYYYYY->0xC07FFFFF
 121     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 122     .space 0x0400 // 0xYYYYYYYY->0xC08FFFFF
 123     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 124     .space 0x0400 // 0xYYYYYYYY->0xC09FFFFF
 125     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 126     .space 0x0400 // 0xYYYYYYYY->0xC0AFFFFF
 127     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 128     .space 0x0400 // 0xYYYYYYYY->0xC0BFFFFF
 129     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 130     .space 0x0400 // 0xYYYYYYYY->0xC0CFFFFF
 131     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 132     .space 0x0400 // 0xYYYYYYYY->0xC0DFFFFF
 133     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 134     .space 0x0400 // 0xYYYYYYYY->0xC0EFFFFF
 135     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 136     .space 0x0400 // 0xYYYYYYYY->0xC0FFFFFF
 137     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 138
 139 .global MasterTranslationTable
 140 MasterTranslationTable:
 141     .space 0x0400 // 0xYYYYYYYY->0xC10FFFFF
 142     .space 0x0C00 // PADDING FOR 4KB GRANULARITY
 143
 144 .global TranslationTableEnd
 145 TranslationTableEnd: