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-/*
- * $Header$
- *
- * 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
- *
- *
- * 26Sep01 (DJK) The memory map is changed and the device interrupts are
- * now memory-mapped.
- *
- * 10Oct01 (DJK) The memory map is finalized and the first 4K of address
- * space is now reserved for memory-mapped I/O devices.
- * (There is over 2K unused, reserved space in this area.)
- *
- * 27Jul02 (DJK) Fixed the address for the interrupt mask register. Old
- * documentation stated the port address as 0x140, but
- * the implementation uses 0x13c.
- *
- * 30Jul02 (DJK) Added support for printf. This only supports output to
- * stderr and stdout. Using the message box interface,
- * a (newly defined) message or series of messages is
- * passed to the controller to output bytes as text to
- * the debug console. These messages are constructed in
- * the interrupt handler for the SI instruction.
- * With this implementation, the user is unable to
- * utilize the message box interface in applications as
- * specialized interrupt handlers for the external
- * interrupts are necessary.
- *
- *
- *
- * Copyright (c) 2001, 2002, 2003, 2004 Morpho Technologies, Inc.
- *
- */
-
- .section .startup, "a", @progbits
- .global __boot_start
-_INTERRUPT_VECTOR_TABLE:
-__boot_start:
- 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
-
-
- ; This is the memory-mapped I/O region.
-
- ; Hardware Interrupt Registers
- .org 0x100
- .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
-
- ; 60 bytes minus eight registers (four bytes per register)
- .fill (60 - 8 * 4)
-
- .global _INTERRUPT_MASK_REG
-_INTERRUPT_MASK_REG:
- .word 0x00000000
-
- ; 256 bytes minus sixteen registers (four bytes per register)
- .fill (256 - 16 * 4)
-
-
-
- .org 0x200
- ; MorphoSys Decoder Registers
- .global _MS_DEC_AUTO_INCREMENT_REG
-_MS_DEC_AUTO_INCREMENT_REG:
- .word 0x00000000
-
- .global _MS_DEC_SKIP_FACTOR_REG
-_MS_DEC_SKIP_FACTOR_REG:
- .word 0x00000000
-
- .global _MS_DEC_CUSTOM_PERMUTATION_REG
-_MS_DEC_CUSTOM_PERMUTATION_REG:
- .word 0x00000000
-
- .global _MS_DEC_CONTEXT_BASE_REG
-_MS_DEC_CONTEXT_BASE_REG:
- .word 0x00000000
-
- .global _MS_DEC_LOOKUP_TABLE_BASE_REG
-_MS_DEC_LOOKUP_TABLE_BASE_REG:
- .word 0x00000000
-
- .global _MS_CIRCULAR_BUFFER_END_REG
-_MS_CIRCULAR_BUFFER_END_REG:
- .word (__FRAME_BUFFER_END)
-
- .global _MS_CIRCULAR_BUFFER_SIZE_REG
-_MS_CIRCULAR_BUFFER_SIZE_REG:
- .word __FRAME_BUFFER_SIZE
-
- .global _MS_DATA_BLOCK_END_REG
-_MS_DATA_BLOCK_END_REG:
- .word 0x00000000
-
- .global _MS_DATA_BLOCK_SIZE_REG
-_MS_DATA_BLOCK_SIZE_REG:
- .word 0x00000000
-
- ; 256 bytes minus nine registers (four bytes per register)
- .fill (256 - 9 * 4)
-
-
-
- .org 0x300
- ; Debug Registers
- .global _DEBUG_HALT_REG
-_DEBUG_HALT_REG:
- .word 0x00000000
-
- .global _DEBUG_BREAK_REG
-_DEBUG_BREAK_REG:
- .word 0x00000000
-
- .global _DEBUG_HW_RESERVED0_REG
-_DEBUG_HW_RESERVED0_REG:
- .word 0x00000000
-
- .global _DEBUG_HW_RESERVED1_REG
-_DEBUG_HW_RESERVED1_REG:
- .word 0x00000000
-
- .global _DEBUG_HW_RESERVED2_REG
-_DEBUG_HW_RESERVED2_REG:
- .word 0x00000000
-
- .global _DEBUG_HW_RESERVED3_REG
-_DEBUG_HW_RESERVED3_REG:
- .word 0x00000000
-
- .global _DEBUG_HW_RESERVED4_REG
-_DEBUG_HW_RESERVED4_REG:
- .word 0x00000000
-
- .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 0x400
- ; Sequence Generator Registers
-_SEQ_GEN_REGS:
- .fill 256
-
-
-
- .org 0x500
-_RESERVED_SEQ_GEN_REGS:
- .fill 256
-
-
-
- .org 0x600
- .global _TIMER0_VAL_REG
-_TIMER0_VAL_REG:
- .word 0x00000000
-
- .global _TIMER0_CTRL_REG
-_TIMER0_CTRL_REG:
- .word 0x00000000
-
- .global _TIMER1_VAL_REG
-_TIMER1_VAL_REG:
- .word 0x00000000
-
- .global _TIMER1_CTRL_REG
-_TIMER1_CTRL_REG:
- .word 0x00000000
-
- .global _TIMER2_VAL_REG
-_TIMER2_VAL_REG:
- .word 0x00000000
-
- .global _TIMER2_CTRL_REG
-_TIMER2_CTRL_REG:
- .word 0x00000000
-
- ; 256 bytes minus six registers (four bytes per register)
- .fill (256 - 6 * 4)
-
-
-
- .org 0x700
- .global _OUTPUT0_CONTROL
-_OUTPUT0_CONTROL:
- .word 0x00000000
-
- .global _OUTPUT1_CONTROL
-_OUTPUT1_CONTROL:
- .word 0x00000000
-
- .global _OUTPUT2_CONTROL
-_OUTPUT2_CONTROL:
- .word 0x00000000
-
- .global _OUTPUT3_CONTROL
-_OUTPUT3_CONTROL:
- .word 0x00000000
-
- .global _OUTPUT4_CONTROL
-_OUTPUT4_CONTROL:
- .word 0x00000000
-
- .global _OUTPUT5_CONTROL
-_OUTPUT5_CONTROL:
- .word 0x00000000
-
- .global _OUTPUT6_CONTROL
-_OUTPUT6_CONTROL:
- .word 0x00000000
-
- .global _OUTPUT7_CONTROL
-_OUTPUT7_CONTROL:
- .word 0x00000000
-
- ; 256 bytes minus eight registers (four bytes per register)
- .fill (256 - 8 * 4)
-
-
-
- .org 0x800
- ; Reserved memory-mapped space.
- .fill (0x1000 - 0x800)
-
-
-
- .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
- ; for devices zero through seven.
- 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)
-
- ; 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 0x31C 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
- ; SYS_call is handled by simulator here...
- or r0, r0, r0
- ldw r10, sp, #$0
- or r0, r0, r0
- ldw r9, sp, #$4
- reti r14
- addi sp, sp, #$8
-
-
-
- .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
- ldw r10, sp, #$0
- subi r15, r15, #$4 ; Backup to address of break
- ldw r9, sp, #$4
- reti r15
- addi sp, sp, #$8
-
-
-
- .global _IVEC_DEFAULT
-_IVEC_DEFAULT:
- reti r15
- or r0, r0, r0
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