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-- Copyright 1987, 1988 Verdix Corporation

----------------------------------------------------------------------
-- This package provides the M68000 processor family machine
-- configuration definitions and data structures used by the RTS Kernel.
----------------------------------------------------------------------
package v_cpu_conf is

    pragma suppress(ALL_CHECKS);
    pragma suppress(EXCEPTION_TABLES);
    pragma not_elaborated;

    --
    -- Default trap numbers
    --
    DEFAULT_KRN_TRAP:           constant := 0;
    DEFAULT_TDM_TRAP:           constant := 15;

    --
    -- Vector index for Trap 0
    --
    TRAP_0_VECTOR_NUMBER: constant := 32;

    --
    -- Status register masks
    --
    S_MASK:             constant := 16#2000#;   -- Supervisor/User state
    NOT_S_MASK:         constant := 16#dfff#;
    M_MASK:             constant := 16#1000#;   -- Master/interrupt state
    NOT_M_MASK:         constant := 16#efff#;
    IPL_MASK:      	    constant := 16#0700#;	-- Interrupt priority level
    NOT_IPL_MASK:    	constant := 16#f8ff#;

    -- Supervisor/User state bit number in upper byte of status register
    S_BIT:              constant := 5;

    -- Master/interrupt state bit number in upper byte of status register
    M_BIT:              constant := 4;

    -- Kernel status register: trace disabled, supervisor state, interrupt
    -- state, interrupt priority = 7 (disabled)
    KRN_STATUS: constant := 16#2700#;

    -- User status register: trace disabled, user state, interrupt state,
    -- interrupt priority = 0 (enabled)
    USER_STATUS: constant := 16#0000#;

    --
    -- Exception stack frame offsets, masks and format types
    --
    SR_FRAME_OFFSET:                    constant := 0;
    PC_FRAME_OFFSET:                    constant := 2;
    FORMAT_VECTOR_FRAME_OFFSET:         constant := 6;
    INSTR_ADDR_FRAME_OFFSET:            constant := 8;
    MID_INSTR_INTERNAL_FRAME_OFFSET:    constant := 12;

    FORMAT_MASK:                        constant := 16#f000#;
    VECTOR_OFFSET_MASK:                 constant := 16#0fff#;

    SHORT_FORMAT:                       constant := 16#0000#;
    THROWAWAY_FORMAT:                   constant := 16#1000#;
    NORMAL_SIX_WORD_FORMAT:             constant := 16#2000#;
    COPROCESSOR_MID_INSTR_FORMAT:       constant := 16#9000#;
end v_cpu_conf;