amd64/bareMetalOS-0.5.2/pure64.boot0/src/interrupt.asm

   1 ; =============================================================================
   2 ; Pure64 -- a 64-bit OS loader written in Assembly for x86-64 systems
   3 ; Copyright (C) 2008-2011 Return Infinity -- see LICENSE.TXT
   4 ;
   5 ; Interrupts
   6 ; =============================================================================
   7
   8
   9 ; -----------------------------------------------------------------------------
  10 ; Default exception handler
  11 exception_gate:
  12         mov rsi, int_string
  13         call os_print_string
  14         mov rsi, exc_string
  15         call os_print_string
  16         jmp $                                   ; hang
  17 ; -----------------------------------------------------------------------------
  18
  19
  20 ; -----------------------------------------------------------------------------
  21 ; Default interrupt handler
  22 interrupt_gate:                         ; handler for all other interrupts
  23         iretq
  24 ; -----------------------------------------------------------------------------
  25
  26
  27 ; -----------------------------------------------------------------------------
  28 ; Real-time clock interrupt. IRQ 0x00, INT 0x20
  29 align 16
  30 timer:
  31         add qword [os_Counter], 1       ; 64-bit counter started at bootup
  32         mov al, 0x20                    ; Acknowledge the IRQ
  33         out 0x20, al
  34         iretq
  35 ; -----------------------------------------------------------------------------
  36
  37
  38 ; -----------------------------------------------------------------------------
  39 ; CPU Exception Gates
  40 exception_gate_00:
  41         mov al, 0x00
  42         jmp exception_gate_main
  43
  44 exception_gate_01:
  45         mov al, 0x01
  46         jmp exception_gate_main
  47
  48 exception_gate_02:
  49         mov al, 0x02
  50         jmp exception_gate_main
  51
  52 exception_gate_03:
  53         mov al, 0x03
  54         jmp exception_gate_main
  55
  56 exception_gate_04:
  57         mov al, 0x04
  58         jmp exception_gate_main
  59
  60 exception_gate_05:
  61         mov al, 0x05
  62         jmp exception_gate_main
  63
  64 exception_gate_06:
  65         mov al, 0x06
  66         jmp exception_gate_main
  67
  68 exception_gate_07:
  69         mov al, 0x07
  70         jmp exception_gate_main
  71
  72 exception_gate_08:
  73         mov al, 0x08
  74         jmp exception_gate_main
  75
  76 exception_gate_09:
  77         mov al, 0x09
  78         jmp exception_gate_main
  79
  80 exception_gate_10:
  81         mov al, 0x0A
  82         jmp exception_gate_main
  83
  84 exception_gate_11:
  85         mov al, 0x0B
  86         jmp exception_gate_main
  87
  88 exception_gate_12:
  89         mov al, 0x0C
  90         jmp exception_gate_main
  91
  92 exception_gate_13:
  93         mov al, 0x0D
  94         jmp exception_gate_main
  95
  96 exception_gate_14:
  97         mov al, 0x0E
  98         jmp exception_gate_main
  99
 100 exception_gate_15:
 101         mov al, 0x0F
 102         jmp exception_gate_main
 103
 104 exception_gate_16:
 105         mov al, 0x10
 106         jmp exception_gate_main
 107
 108 exception_gate_17:
 109         mov al, 0x11
 110         jmp exception_gate_main
 111
 112 exception_gate_18:
 113         mov al, 0x12
 114         jmp exception_gate_main
 115
 116 exception_gate_19:
 117         mov al, 0x13
 118         jmp exception_gate_main
 119
 120 exception_gate_main:
 121         call os_print_newline
 122         mov rsi, int_string
 123         call os_print_string
 124         mov rsi, exc_string00
 125         and rax, 0xFF                   ; Clear out everything in RAX except for AL
 126         mov bl, 8
 127         mul bl                          ; AX = AL x BL
 128         add rsi, rax                    ; Use the value in RAX as an offset to get to the right message
 129         call os_print_string
 130         call os_print_newline
 131         call os_dump_regs
 132
 133 exception_gate_main_hang:
 134         nop
 135         jmp exception_gate_main_hang    ; Hang. User must reset machine at this point
 136
 137 ; Strings for the error messages
 138 int_string db 'Pure64 - Interrupt ', 0
 139 exc_string db '?? - Unknown Fatal Exception!', 0
 140 align 16
 141 exc_string00 db '00 - DE', 0
 142 exc_string01 db '01 - DB', 0
 143 exc_string02 db '02     ', 0
 144 exc_string03 db '03 - BP', 0
 145 exc_string04 db '04 - OF', 0
 146 exc_string05 db '05 - BR', 0
 147 exc_string06 db '06 - UD', 0
 148 exc_string07 db '07 - NM', 0
 149 exc_string08 db '08 - DF', 0
 150 exc_string09 db '09     ', 0    ; No longer generated on new CPU's
 151 exc_string10 db '10 - TS', 0
 152 exc_string11 db '11 - NP', 0
 153 exc_string12 db '12 - SS', 0
 154 exc_string13 db '13 - GP', 0
 155 exc_string14 db '14 - PF', 0
 156 exc_string15 db '15     ', 0
 157 exc_string16 db '16 - MF', 0
 158 exc_string17 db '17 - AC', 0
 159 exc_string18 db '18 - MC', 0
 160 exc_string19 db '19 - XM', 0
 161
 162
 163 ; =============================================================================
 164 ; EOF