132 lines
5.1 KiB
Plaintext
132 lines
5.1 KiB
Plaintext
;********************************************************************************************************
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; uC/CPU
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; CPU CONFIGURATION & PORT LAYER
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;
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; Copyright 2004-2021 Silicon Laboratories Inc. www.silabs.com
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;
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; SPDX-License-Identifier: APACHE-2.0
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;
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; This software is subject to an open source license and is distributed by
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; Silicon Laboratories Inc. pursuant to the terms of the Apache License,
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; Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
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;
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;********************************************************************************************************
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;********************************************************************************************************
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;
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; CPU PORT FILE
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;
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; V850E2M
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; IAR compiler for V850
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;
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; Filename : cpu_a.s85
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; Version : V1.32.01
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;********************************************************************************************************
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;********************************************************************************************************
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; PUBLIC FUNCTIONS
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;********************************************************************************************************
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PUBLIC CPU_SR_Save
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PUBLIC CPU_SR_Restore
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PUBLIC CPU_IntDis
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PUBLIC CPU_IntEn
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PUBLIC CPU_EIIC_Rd
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;********************************************************************************************************
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; EQUATES
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;********************************************************************************************************
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PSW EQU 5
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EIIC EQU 13
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;********************************************************************************************************
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; CODE GENERATION DIRECTIVES
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;********************************************************************************************************
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RSEG CODE:CODE:NOROOT(2)
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;********************************************************************************************************
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; SAVE/RESTORE CPU STATUS REGISTER
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;
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; Description : Save/Restore the state of CPU interrupts, if possible.
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;
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; (1) (c) For CPU_CRITICAL_METHOD_STATUS_LOCAL, the state of the interrupt status flag is
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; stored in the local variable 'cpu_sr' & interrupts are then disabled ('cpu_sr' is
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; allocated in all functions that need to disable interrupts). The previous interrupt
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; status state is restored by copying 'cpu_sr' into the CPU's status register.
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;
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;
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; Prototypes : CPU_SR CPU_SR_Save (void);
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; void CPU_SR_Restore(CPU_SR cpu_sr);
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;
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; Note(s) : (1) These functions are used in general like this :
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;
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; void Task (void *p_arg)
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; {
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; CPU_SR_ALLOC(); /* Allocate storage for CPU status register */
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; :
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; :
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; CPU_CRITICAL_ENTER(); /* cpu_sr = CPU_SR_Save(); */
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; :
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; :
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; CPU_CRITICAL_EXIT(); /* CPU_SR_Restore(cpu_sr); */
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; :
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; }
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;********************************************************************************************************
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CPU_SR_Save:
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stsr PSW, r1 ; Store PSW
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di
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jmp [lp]
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CPU_SR_Restore:
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ldsr r1 , PSW
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jmp [lp]
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;********************************************************************************************************
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; DISABLE and ENABLE INTERRUPTS
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;
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; Description: Disable/Enable interrupts.
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;
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; Prototypes : void CPU_IntDis(void);
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; void CPU_IntEn (void);
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;********************************************************************************************************
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CPU_IntDis:
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di
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jmp [lp]
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CPU_IntEn:
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ei
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jmp [lp]
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;********************************************************************************************************
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; READS CPU EXCEPTION CAUSE REGISTER
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;
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; Description : Reads CPU EI level exception code register(EIIC), which retains the cause of any EI level
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; exception that occurs.
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;
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; Prototypes : CPU_DATA CPU_EIIC_Rd (void);
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;
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; Note(s) : None.
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;
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;********************************************************************************************************
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CPU_EIIC_Rd:
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stsr EIIC, r1
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jmp [lp]
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;********************************************************************************************************
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; CPU ASSEMBLY PORT FILE END
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;********************************************************************************************************
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END
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