URL
https://opencores.org/ocsvn/open8_urisc/open8_urisc/trunk
Subversion Repositories open8_urisc
[/] [open8_urisc/] [trunk/] [taskmgr/] [app.s] - Rev 318
Go to most recent revision | Compare with Previous | Blame | View Log
; Copyright (c)2022 Jeremy Seth Henry ; All rights reserved. ; ; Redistribution and use in source and binary forms, with or without ; modification, are permitted provided that the following conditions are met: ; * Redistributions of source code must retain the above copyright ; notice, this list of conditions and the following disclaimer. ; * Redistributions in binary form must reproduce the above copyright ; notice, this list of conditions and the following disclaimer in the ; documentation and/or other materials provided with the distribution, ; where applicable (as part of a user interface, debugging port, etc.) ; ; THIS SOFTWARE IS PROVIDED BY JEREMY SETH HENRY ``AS IS'' AND ANY ; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED ; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE ; DISCLAIMED. IN NO EVENT SHALL JEREMY SETH HENRY BE LIABLE FOR ANY ; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; ; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF ; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ; ;------------------------------------------------------------------------------ ; Sample Task Manager application ; ; Revision History ; Author Date Change ;---------------- -------- --------------------------------------------------- ; Seth Henry 7/15/22 Initial Release ;----------------------------------------------------------------------------- ;------------------------------------------------------------------------------ ; This application requires the following build parameters in the Open8 CPU ; core to function correctly: ; ; Allow_Stack_Address_Move => true RSP may relocate/retrieve the SP->R1:R0 ; Enable_Auto_Increment => true Indexed load/store instructions can use ; auto-increment feature when Rn is odd ; (or Rn++ is specified). ; BRK_Implements_WAI => true BRK is interpreted as a WAI ; Enable_NMI => true Interrupt 0 is not maskable ; Sequential_Interrupts => true ISRs are NOT interruptable ; RTI_Ignores_GP_Flags => true RTI restores only lower 4 ALU flags ; Supervisor_Mode => true I-bit is restrictive ; Unsigned_Index_Offsets => true LDO/SDO treat offset as UNSIGNED ; Rotate_Ignores_Carry => true Rotate instrs do not use the carry ; Default_Int_Mask => x"00" CPU starts with only the NMI active ; ; Further note - NOP is mapped to BRK in the assembler. Do NOT use NOP with ; the BRK_Implements_WAI enabled, as the NOP will instead trigger WAI. ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; BNI is used as a BRA (branch always) in user-mode code, since the I-bit ; should never be set. There are checks in each task's main loop that verify ; that this bit is cleared, and will panic the system otherwise. ; Similarily, in code running in the supervisor context, the I bit should ; always be set, potentially allowing BRI to be used as a BRA. Note that this ; isn't inherently safe, as ISR's are allowed to clear the I bit themselves ; while user-mode code can't affect the I-bit. ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Include block - add all of the other source files here ; ; Note that the order of included files is important due to the way the ; assembler works. Any constant which is used to derive another constant must ; be defined first. The exception is creating pointer tables, which occurs on ; a later pass. ;------------------------------------------------------------------------------ .INCLUDE "sys_hw_map.s" ; System Memory Map (HDL <> ASSY) .INCLUDE "sys_const.s" ; System-Wide Constants .INCLUDE "sys_version.s" ; System software version .INCLUDE "taskmgr_config.s" ; Task manager cconfiguration constants .INCLUDE "taskmgr_const.s" ; Main task scheduler constants .INCLUDE "task_0_const.s" ; Task 0 Constants & Macros .INCLUDE "task_1_const.s" ; Task 1 Constants & Macros .INCLUDE "taskmgr_func.s" ; Main task scheduler & ISR code .INCLUDE "task_0_func.s" ; Task 0 Executable .INCLUDE "task_1_func.s" ; Task 1 Executable ;------------------------------------------------------------------------------
Go to most recent revision | Compare with Previous | Blame | View Log