Subversion Repositories openrisc

/*
 * interrupt_vectors.s -- the interrupt handler jump table. 
 *
 *
 * There are a total of 32 interrupt vector possible, however, only
 *   11 of those are currently used (the others are reserved). The
 *   order of vectors is as follows:
 *
 *     1. Boot Vector. Vector for power-on/reset.
 *     2. Software Vector. Vector for handling the SI instruction (an
 *          explicit interrupt caused by software).
 *     3. Break Vector. Vector for handling the Break instruction.
 *     4. Device 0 Vector. Service vector for device zero. 
 *     5. Device 1 Vector. Service vector for device one. 
 *     6. Device 2 Vector. Service vector for device two. 
 *     7. Device 3 Vector. Service vector for device three. 
 *     8. Device 4 Vector. Service vector for device four. 
 *     9. Device 5 Vector. Service vector for device five. 
 *    10. Device 6 Vector. Service vector for device six. 
 *    11. Device 7 Vector. Service vector for device seven. 
 *
 *   The rest of the interrupt vectors are reserved for future use.
 *
 *
 * Each jump table entry consists of the following two instructions:
 *
 *   jmp Label          ; Label as appropriate
 *   nop                ; implemented as or r0,r0,r0
 *
 *   The following labels are reserved for the vectors named above,
 *   respectively:
 *
 *     _BOOTIVEC, _SOFTIVEC, _BRKIVEC, _DEV0IVEC, _DEV1IVEC, _DEV2IVEC,
 *     _DEV3IVEC, _DEV4IVEC, _DEV5IVEC, _DEV6IVEC, _DEV7IVEC
 *
 *
 *
 * Copyright (c) 2001, 2002, 2003, 2004 Morpho Technologies
 *
 */

        .section .startup, "a", @progbits
        .global __boot_start
__boot_start:
_INTERRUPT_VECTOR_TABLE:
        jmp     _BOOTIVEC               ; Boot vector
        or      r0, r0, r0
        jmp     _SOFTIVEC               ; Vector for SI instruction
        or      r0,r0,r0
        jmp     _BRKIVEC                ; Vector for Break instruction
        or      r0,r0,r0
        ; The illegal instruction trap is not implemented.
_RESERVED1_IVEC:
        jmp     _RESERVED1_IVEC         ; Vector for illegal instruction
        or      r0,r0,r0
        jmp     _OVFIVEC                ; Vector for overflow exception
        or      r0,r0,r0
_RESERVED2_IVEC:
        jmp     _RESERVED2_IVEC
        or      r0,r0,r0
_RESERVED3_IVEC:
        jmp     _RESERVED3_IVEC
        or      r0,r0,r0
_RESERVED4_IVEC:
        jmp     _RESERVED4_IVEC
        or      r0,r0,r0

        .text

        .equ SI_IOPORT_ADR, _DEBUG_SW_SYSREQ_REG
        .equ SI_IOPORT_BIT, 0x1
        .equ BRK_IOPORT_ADR, _DEBUG_BREAK_REG
        .equ BRK_IOPORT_BIT, 0x1

        .global _BOOTIVEC
_BOOTIVEC:
        ; Initialize the interrupt controller's interrupt vector registers
        ldui    r1, #%hi16(_IVEC_DEFAULT)
        ori     r1, r1, #%lo16(_IVEC_DEFAULT)
        stw     r1, r0, #%lo16(_DEV0_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV1_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV2_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV3_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV4_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV5_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV6_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV7_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV8_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV9_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV10_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV11_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV12_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV13_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV14_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV15_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV16_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV17_INTERRUPT_REG)
        stw     r1, r0, #%lo16(_DEV18_INTERRUPT_REG)

        ; Statically initialized data must be copied from ROM to RAM.
        ; This is done in the C run-time start-up code (crt0.o).

        ; Jump to the beginning of the application and enable interrupts.
        jmp     _start
        ei



        ; Handler for the SI instruction. To perform a system call, the
        ; C model uses a trapping mechanism which executes an SI instruction.
        ; The Morpho Technologies simulator simply performs a branch to
        ; this vector to simulate the SI instruction (this is as the hardware
        ; behaves). In order to trigger the simulator that a system call
        ; is needed a write into the I/O register at address $40005 to
        ; set bit #2 (0x4) is necessary.
        ;
        ; The above address has been changed to 0x00031C and the bit number
        ; is zero. (The manifest constants have been changed to reflect this.)
        .global _SOFTIVEC
_SOFTIVEC:
        ; Build a frame to save registers.
        subi    sp, sp, #$8
        stw     r9, sp, #$4
        ldui    r9, #%hi16(SI_IOPORT_ADR)
        stw     r10, sp, #$0
        ori     r9, r9, #%lo16(SI_IOPORT_ADR)
        ori     r10, r0, #SI_IOPORT_BIT
        stw     r10, r9, #$0
        or      r0, r0, r0      ; SYS_call is handled by simulator here...
        ldw     r10, sp, #$0
        or      r0, r0, r0
        ldw     r9, sp, #$4
        reti    r14
        addi    sp, sp, #$8



        ; Handler for BREAK instruction. This handler triggers the simulator
        ; to send a SIGTRAP signal to gdb by writing to the I/O register at
        ; address $40005, setting bit #0 (0x1).
        ;
        ; The above address has been changed to 0x000304 and the bit number
        ; is zero. (The manifest constants have been changed to reflect this.)
        .global _BRKIVEC
_BRKIVEC:
        ; Build a frame to save registers.
        subi    sp, sp, #$8
        stw     r9, sp, #$4
        ldui    r9, #%hi16(BRK_IOPORT_ADR)
        stw     r10, sp, #$0
        ori     r9, r9, #%lo16(BRK_IOPORT_ADR)
        ori     r10, r0, #BRK_IOPORT_BIT
        stw     r10, r9, #$0
        or      r0, r0, r0
        or      r0, r0, r0
        or      r0, r0, r0
        or      r0, r0, r0
        or      r0, r0, r0
        ldw     r10, sp, #$0
        ldw     r9, sp, #$4
        reti    r15
        addi    sp, sp, #$8


        ; The documentation is lacking in the specification of the Overflow
        ;   Exception generation. The address of the instruction causing the
        ;   overflow is placed into R15 and the overflow exception interrupt
        ;   is triggered. So, to continue execution, return to the address
        ;   of the next instruction (i.e., R15 + one instruction).
_OVFIVEC:
        addi    r15, r15, #$4
        or      r0, r0, r0
        reti    r15
        or      r0, r0, r0


        .global _IVEC_DEFAULT
_IVEC_DEFAULT:
        reti    r15
        or      r0, r0, r0


        .section .internal_io, "a", @nobits
        .fill 256               ; Fill the first page.

        ; This is the memory-mapped I/O region.

        ; Hardware Interrupt Registers
        ;.org 0xfff100
        .global _DEV0_INTERRUPT_REG
_DEV0_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV1_INTERRUPT_REG
_DEV1_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV2_INTERRUPT_REG
_DEV2_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV3_INTERRUPT_REG
_DEV3_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV4_INTERRUPT_REG
_DEV4_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV5_INTERRUPT_REG
_DEV5_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV6_INTERRUPT_REG
_DEV6_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV7_INTERRUPT_REG
_DEV7_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV8_INTERRUPT_REG
_DEV8_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV9_INTERRUPT_REG
_DEV9_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV10_INTERRUPT_REG
_DEV10_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV11_INTERRUPT_REG
_DEV11_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV12_INTERRUPT_REG
_DEV12_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV13_INTERRUPT_REG
_DEV13_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV14_INTERRUPT_REG
_DEV14_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV15_INTERRUPT_REG
_DEV15_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV16_INTERRUPT_REG
_DEV16_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV17_INTERRUPT_REG
_DEV17_INTERRUPT_REG:
        .word 0x00000000

        .global _DEV18_INTERRUPT_REG
_DEV18_INTERRUPT_REG:
        .word 0x00000000

        ; 128 bytes minus ten registers (four bytes per register)
        .fill (128 - 19 * 4)

        .global _INTERRUPT_MASK_REG
_INTERRUPT_MASK_REG:
        .word 0x00000000

        ; 128 bytes minus one register (four bytes per register)
        .fill (128 - 1 * 4)


        ;.org 0xfff200
        ; MorphoSys Decoder Registers
        .global _MS_DEC_CIRC_BUFF_SEL_REG
_MS_DEC_CIRC_BUFF_SEL_REG:
        .word 0x00000000

        .global _MS_DEC_SKIP_FACTOR_REG
_MS_DEC_SKIP_FACTOR_REG:
        .word 0x00000000

        .global _MS_DEC_CUSTOM_PERM_REG
_MS_DEC_CUSTOM_PERM_REG:
        .word 0x00000000

        .global _MS_DEC_CTXT_BASE_REG
_MS_DEC_CTXT_BASE_REG:
        .word 0x00000000

        .global _MS_DEC_LOOKUP_TBL_REG
_MS_DEC_LOOKUP_TBL_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF0_END_REG
_MS_CIRC_BUFF0_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF0_SIZE_REG
_MS_CIRC_BUFF0_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK0_END_REG
_MS_DATA_BLK0_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK0_SIZE_REG
_MS_DATA_BLK0_SIZE_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF1_END_REG
_MS_CIRC_BUFF1_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF1_SIZE_REG
_MS_CIRC_BUFF1_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK1_END_REG
_MS_DATA_BLK1_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK1_SIZE_REG
_MS_DATA_BLK1_SIZE_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF2_END_REG
_MS_CIRC_BUFF2_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF2_SIZE_REG
_MS_CIRC_BUFF2_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK2_END_REG
_MS_DATA_BLK2_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK2_SIZE_REG
_MS_DATA_BLK2_SIZE_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF3_END_REG
_MS_CIRC_BUFF3_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF3_SIZE_REG
_MS_CIRC_BUFF3_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK3_END_REG
_MS_DATA_BLK3_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK3_SIZE_REG
_MS_DATA_BLK3_SIZE_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF4_END_REG
_MS_CIRC_BUFF4_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF4_SIZE_REG
_MS_CIRC_BUFF4_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK4_END_REG
_MS_DATA_BLK4_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK4_SIZE_REG
_MS_DATA_BLK4_SIZE_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF5_END_REG
_MS_CIRC_BUFF5_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF5_SIZE_REG
_MS_CIRC_BUFF5_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK5_END_REG
_MS_DATA_BLK5_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK5_SIZE_REG
_MS_DATA_BLK5_SIZE_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF6_END_REG
_MS_CIRC_BUFF6_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF6_SIZE_REG
_MS_CIRC_BUFF6_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK6_END_REG
_MS_DATA_BLK6_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK6_SIZE_REG
_MS_DATA_BLK6_SIZE_REG:
        .word 0x00000000

        .global _MS_CIRC_BUFF7_END_REG
_MS_CIRC_BUFF7_END_REG:
        .word (__FRAME_BUFFER_END)

        .global _MS_CIRC_BUFF7_SIZE_REG
_MS_CIRC_BUFF7_SIZE_REG:
        .word __FRAME_BUFFER_SIZE

        .global _MS_DATA_BLK7_END_REG
_MS_DATA_BLK7_END_REG:
        .word 0x00000000

        .global _MS_DATA_BLK7_SIZE_REG
_MS_DATA_BLK7_SIZE_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC0_REG
_MS_DEC_AUTO_INC0_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC1_REG
_MS_DEC_AUTO_INC1_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC2_REG
_MS_DEC_AUTO_INC2_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC3_REG
_MS_DEC_AUTO_INC3_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC4_REG
_MS_DEC_AUTO_INC4_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC5_REG
_MS_DEC_AUTO_INC5_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC6_REG
_MS_DEC_AUTO_INC6_REG:
        .word 0x00000000

        .global _MS_DEC_AUTO_INC7_REG
_MS_DEC_AUTO_INC7_REG:
        .word 0x00000000


        ; 256 bytes minus forty-five registers (four bytes per register)
        .fill (256 - 45 * 4)



        ;.org 0xfff300
        ; Debug Registers
        .global _DEBUG_HALT_REG
_DEBUG_HALT_REG:
        .word 0x00000000

        .global _DEBUG_BREAK_REG
_DEBUG_BREAK_REG:
        .word 0x00000000

        ; There are five reserved registers.
        .fill (5 * 4)

        .global _DEBUG_SW_SYSREQ_REG
_DEBUG_SW_SYSREQ_REG:
        .word 0x00000000

        ; 256 bytes minus eight registers (four bytes per register)
        .fill (256 - 8 * 4)



        ;.org 0xfff400
        ; Sequence Generator Registers
        .global _SEQ_GEN_CTRL_REG
_SEQ_GEN_CTRL_REG:
        .word 0x00000000

        .global _SEQ_GEN_MASK_REGS
_SEQ_GEN_MASK_REGS:
        ; The mask registers consume two pages (less one control register).
        ; 512 bytes minus one register (four bytes per register).
        .fill (256 + 256 - 1 * 4)



        ;.org 0xfff600
        ; Timer Registers
        .global _TIMER0_VAL_REG
_TIMER0_VAL_REG:
        .word 0x00000000

        .global _TIMER1_VAL_REG
_TIMER1_VAL_REG:
        .word 0x00000000

        .global _TIMER2_VAL_REG
_TIMER2_VAL_REG:
        .word 0x00000000

        .global _TIMER3_VAL_REG
_TIMER3_VAL_REG:
        .word 0x00000000

        ; 256 bytes minus four registers (four bytes per register)
        .fill (256 - 4 * 4)



        ;.org 0xfff700
        ; Output Line Control Registers
        .global _OUTPUT0_CTRL
_OUTPUT0_CTRL:
        .word 0x00000000

        .global _OUTPUT1_CTRL
_OUTPUT1_CTRL:
        .word 0x00000000

        .global _OUTPUT2_CTRL
_OUTPUT2_CTRL:
        .word 0x00000000

        .global _OUTPUT3_CTRL
_OUTPUT3_CTRL:
        .word 0x00000000

        .global _OUTPUT4_CTRL
_OUTPUT4_CTRL:
        .word 0x00000000

        .global _OUTPUT5_CTRL
_OUTPUT5_CTRL:
        .word 0x00000000

        .global _OUTPUT6_CTRL
_OUTPUT6_CTRL:
        .word 0x00000000

        .global _OUTPUT7_CTRL
_OUTPUT7_CTRL:
        .word 0x00000000

        .global _OUTPUT8_CTRL
_OUTPUT8_CTRL:
        .word 0x00000000

        .global _OUTPUT9_CTRL
_OUTPUT9_CTRL:
        .word 0x00000000

        .global _OUTPUT10_CTRL
_OUTPUT10_CTRL:
        .word 0x00000000

        ;; 128 bytes minus eleven registers (four bytes per register)
        ;.fill (128 - 11 * 4)

        .global _INPUT0_CTRL
_INPUT0_CTRL:
        .word 0x00000000

        ;; 128 bytes minus one register (four bytes per register)
        ;.fill (128 - 1 * 4)
        ; 256 bytes minus twelve registers (four bytes per register)
        .fill (256 - 12 * 4)



        ;.org 0xfff800
        ; IQ Buffer Registers
        .global _IQ_BUFF_CTRL_REG
_IQ_BUFF_CTRL_REG:
        .word 0x00000000

        .global _IQ_BUFF_PARAMETER1_REG
_IQ_BUFF_PARAMETER1_REG:
        .word 0x00000000

        .global _IQ_BUFF_DATA_SIZE1_REG
_IQ_BUFF_DATA_SIZE1_REG:
        .word 0x00000000

        .global _IQ_BUFF_TRANSFER_SIZE1_REG
_IQ_BUFF_TRANSFER_SIZE1_REG:
        .word 0x00000000

        .global _IQ_BUFF_FB_ADDR1_REG
_IQ_BUFF_FB_ADDR1_REG:
        .word 0x00000000

        .global _IQ_BUFF_PARAMETER2_REG
_IQ_BUFF_PARAMETER2_REG:
        .word 0x00000000

        .global _IQ_BUFF_DATA_SIZE2_REG
_IQ_BUFF_DATA_SIZE2_REG:
        .word 0x00000000

        .global _IQ_BUFF_TRANSFER_SIZE2_REG
_IQ_BUFF_TRANSFER_SIZE2_REG:
        .word 0x00000000

        .global _IQ_BUFF_FB_ADDR2_REG
_IQ_BUFF_FB_ADDR2_REG:
        .word 0x00000000

        ; 256 bytes minus nine registers (four bytes per register)
        .fill (256 - 9 * 4)


        ;.org 0xfff900
        ; Reserved memory-mapped space.
        .fill (0x1000 - 0x900)