amd64/pure64-0.5.0/src/interrupt.asm

   1 ; =============================================================================
   2 ; Pure64 -- a 64-bit OS loader written in Assembly for x86-64 systems
   3 ; Copyright (C) 2008-2012 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 exception_gate_halt:
  17         cli                             ; Disable interrupts
  18         hlt                             ; Halt the system
  19         jmp exception_gate_halt
  20 ; -----------------------------------------------------------------------------
  21
  22
  23 ; -----------------------------------------------------------------------------
  24 ; Default interrupt handler
  25 interrupt_gate:                         ; handler for all other interrupts
  26         iretq
  27 ; -----------------------------------------------------------------------------
  28
  29
  30 ; -----------------------------------------------------------------------------
  31 ; Keyboard interrupt. IRQ 0x01, INT 0x21
  32 ; This IRQ runs whenever there is input on the keyboard
  33 align 16
  34 keyboard:
  35         push rdi
  36         push rax
  37
  38         xor rax, rax
  39
  40         in al, 0x60                     ; Get the scancode from the keyboard
  41         test al, 0x80
  42         jz keydown
  43         jmp keyboard_done
  44
  45 keydown:
  46         mov [0x000B8088], al            ; Dump the scancode to the screen
  47
  48         mov rax, [os_Counter_RTC]
  49         add rax, 10
  50         mov [os_Counter_RTC], rax
  51
  52 keyboard_done:
  53         mov rdi, [os_LocalAPICAddress]  ; Acknowledge the IRQ on APIC
  54         add rdi, 0xB0
  55         xor eax, eax
  56         stosd
  57
  58         pop rax
  59         pop rdi
  60         iretq
  61 ; -----------------------------------------------------------------------------
  62
  63
  64 ; -----------------------------------------------------------------------------
  65 ; Real-time clock interrupt. IRQ 0x08, INT 0x28
  66 align 16
  67 rtc:
  68         push rdi
  69         push rax
  70
  71         add qword [os_Counter_RTC], 1   ; 64-bit counter started at bootup
  72
  73         mov al, 'R'
  74         mov [0x000B8092], al
  75         mov rax, [os_Counter_RTC]
  76         and al, 1                       ; Clear all but lowest bit (Can only be 0 or 1)
  77         add al, 48
  78         mov [0x000B8094], al
  79         mov al, 0x0C                    ; Select RTC register C
  80         out 0x70, al                    ; Port 0x70 is the RTC index, and 0x71 is the RTC data
  81         in al, 0x71                     ; Read the value in register C
  82
  83         mov rdi, [os_LocalAPICAddress]  ; Acknowledge the IRQ on APIC
  84         add rdi, 0xB0
  85         xor eax, eax
  86         stosd
  87
  88         pop rax
  89         pop rdi
  90         iretq
  91 ; -----------------------------------------------------------------------------
  92
  93
  94 ; -----------------------------------------------------------------------------
  95 ; Spurious interrupt. INT 0xFF
  96 align 16
  97 spurious:                               ; handler for spurious interrupts
  98         mov al, 'S'
  99         mov [0x000B8080], al
 100         iretq
 101 ; -----------------------------------------------------------------------------
 102
 103
 104 ; -----------------------------------------------------------------------------
 105 ; CPU Exception Gates
 106 exception_gate_00:
 107         mov al, 0x00
 108         jmp exception_gate_main
 109
 110 exception_gate_01:
 111         mov al, 0x01
 112         jmp exception_gate_main
 113
 114 exception_gate_02:
 115         mov al, 0x02
 116         jmp exception_gate_main
 117
 118 exception_gate_03:
 119         mov al, 0x03
 120         jmp exception_gate_main
 121
 122 exception_gate_04:
 123         mov al, 0x04
 124         jmp exception_gate_main
 125
 126 exception_gate_05:
 127         mov al, 0x05
 128         jmp exception_gate_main
 129
 130 exception_gate_06:
 131         mov al, 0x06
 132         jmp exception_gate_main
 133
 134 exception_gate_07:
 135         mov al, 0x07
 136         jmp exception_gate_main
 137
 138 exception_gate_08:
 139         mov al, 0x08
 140         jmp exception_gate_main
 141
 142 exception_gate_09:
 143         mov al, 0x09
 144         jmp exception_gate_main
 145
 146 exception_gate_10:
 147         mov al, 0x0A
 148         jmp exception_gate_main
 149
 150 exception_gate_11:
 151         mov al, 0x0B
 152         jmp exception_gate_main
 153
 154 exception_gate_12:
 155         mov al, 0x0C
 156         jmp exception_gate_main
 157
 158 exception_gate_13:
 159         mov al, 0x0D
 160         jmp exception_gate_main
 161
 162 exception_gate_14:
 163         mov al, 0x0E
 164         jmp exception_gate_main
 165
 166 exception_gate_15:
 167         mov al, 0x0F
 168         jmp exception_gate_main
 169
 170 exception_gate_16:
 171         mov al, 0x10
 172         jmp exception_gate_main
 173
 174 exception_gate_17:
 175         mov al, 0x11
 176         jmp exception_gate_main
 177
 178 exception_gate_18:
 179         mov al, 0x12
 180         jmp exception_gate_main
 181
 182 exception_gate_19:
 183         mov al, 0x13
 184         jmp exception_gate_main
 185
 186 exception_gate_main:
 187         call os_print_newline
 188         mov rsi, int_string
 189         call os_print_string
 190         mov rsi, exc_string00
 191         and rax, 0xFF                   ; Clear out everything in RAX except for AL
 192         mov bl, 8
 193         mul bl                          ; AX = AL x BL
 194         add rsi, rax                    ; Use the value in RAX as an offset to get to the right message
 195         call os_print_string
 196         mov rsi, adr_string
 197         call os_print_string
 198         mov rax, [rsp]
 199         mov rdi, os_dump_reg_tstring
 200         call os_int_to_hex_string               ; Convert the register value to a hex string
 201         mov rsi, os_dump_reg_tstring
 202         call os_print_string                    ; Print the hex string
 203         call os_print_newline
 204         call os_dump_regs
 205
 206 exception_gate_main_hang:
 207         nop
 208         jmp exception_gate_main_hang    ; Hang. User must reset machine at this point
 209
 210 ; Strings for the error messages
 211 int_string db 'Pure64 - Exception ', 0
 212 adr_string db ' @ 0x', 0
 213 exc_string db '?? - Unknown', 0
 214 align 16
 215 exc_string00 db '00 - DE', 0
 216 exc_string01 db '01 - DB', 0
 217 exc_string02 db '02     ', 0
 218 exc_string03 db '03 - BP', 0
 219 exc_string04 db '04 - OF', 0
 220 exc_string05 db '05 - BR', 0
 221 exc_string06 db '06 - UD', 0
 222 exc_string07 db '07 - NM', 0
 223 exc_string08 db '08 - DF', 0
 224 exc_string09 db '09     ', 0    ; No longer generated on new CPU's
 225 exc_string10 db '10 - TS', 0
 226 exc_string11 db '11 - NP', 0
 227 exc_string12 db '12 - SS', 0
 228 exc_string13 db '13 - GP', 0
 229 exc_string14 db '14 - PF', 0
 230 exc_string15 db '15     ', 0
 231 exc_string16 db '16 - MF', 0
 232 exc_string17 db '17 - AC', 0
 233 exc_string18 db '18 - MC', 0
 234 exc_string19 db '19 - XM', 0
 235
 236
 237 ; =============================================================================
 238 ; EOF