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jshamlet |
; Copyright (c)2022 Jeremy Seth Henry
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; All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions are met:
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; * Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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; * Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in the
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; documentation and/or other materials provided with the distribution,
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; where applicable (as part of a user interface, debugging port, etc.)
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;
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; THIS SOFTWARE IS PROVIDED BY JEREMY SETH HENRY ``AS IS'' AND ANY
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; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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; DISCLAIMED. IN NO EVENT SHALL JEREMY SETH HENRY BE LIABLE FOR ANY
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; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;
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;------------------------------------------------------------------------------
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; taskmgr_func.s
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;
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; Program Start, Task Setup, and Core Interrupt Service
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;
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; Note that the CPU must be in supervisory mode for this code to execute
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; properly, which means the I bit MUST be set at startup. This is controlled
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; by HDL generics - specifically the supervisor mode enable.
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;
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; Revision History
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; Author Date Change
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;---------------- -------- ---------------------------------------------------
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; Seth Henry 7/15/22 Initial Release
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; System Bootstrap / Start of ROM
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;------------------------------------------------------------------------------
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.ORG BOOT_BLOCK
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BOOTSTRAP: JMP INIT_MAIN ; Jump past the pointer block
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NOP ; Aligns the data block, but not executed
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; Pointer table
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;------------------------------------------------------------------------------
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INSTANCE_TASK_POINTERS
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; Task Parameter table
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;------------------------------------------------------------------------------
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INSTANCE_TASK_EXPORTS
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; System start
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;------------------------------------------------------------------------------
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INIT_MAIN: BNI INIT_MAIN ; Trap in a loop if supervisor mode isn't set
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BOOT_SYSTEM
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; RAM Access Fault Shutdown (CALL_PANIC)
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;------------------------------------------------------------------------------
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RAM_FAULT: PROCESS_RAM_FAULT
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; Task Switch ISR (CALL_TASK_SW)
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;------------------------------------------------------------------------------
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TASK_SW_INT: SWITCH_TASKS
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; External Interrupt Handler ISR
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;------------------------------------------------------------------------------
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EXT_INT_MGR:
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.IFDEF INTMGR16
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CHECK_EXTERNAL_IO_INTS16
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.ELSE
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CHECK_EXTERNAL_IO_INTS
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.ENDIF
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; ISR Context Function Calls (CALL_SUPV_FN<n>)
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;------------------------------------------------------------------------------
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INSTANCE_SUPV_FUNCS
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;------------------------------------------------------------------------------
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