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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents 4e78acac3d88
children
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/*
 ************************************************************************
 *                                                                       
 *               Copyright Mentor Graphics Corporation 2002              
 *                         All Rights Reserved.                          
 *                                                                       
 * THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS  
 * THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS   
 * SUBJECT TO LICENSE TERMS.                                             
 *                                                                       
 ************************************************************************
 ************************************************************************
 *                                                                       
 * FILE NAME                            VERSION                          
 *                                                                       
 *      asm_defs.inc            Nucleus PLUS\ARM925\Code Composer 1.14.1 
 *                                                                       
 * COMPONENT                                                             
 *                                                                       
 *      IN - Initialization                                              
 *                                                                       
 * DESCRIPTION                                                           
 *                                                                       
 *      This file contains the target processor dependent initialization 
 *      values used in int.s, tct.s, and tmt.s                      
 *                                                                       
 * HISTORY                                                               
 *                                                                       
 *         NAME            DATE                    REMARKS               
 *                                                                       
 *      B. Ronquillo     08-28-2002          Released version 1.13.1      
 *                                                                       
 ************************************************************************
 */

/*
 **********************************
 * BOARD INITIALIZATION CONSTANTS *
 **********************************
 * Begin define constants used in low-level initialization.
 */

/* CPSR control byte definitions */
#define	LOCKOUT			0xC0	/* Interrupt lockout value */
#define	LOCK_MSK		0xC0	/* Interrupt lockout mask value */
#define	MODE_MASK		0x1F	/* Processor Mode Mask */
#define	SUP_MODE		0x13	/* Supervisor Mode (SVC) */
#define	IRQ_MODE		0x12	/* Interrupt Mode (IRQ) */
#define	IRQ_MODE_OR_LOCKOUT	0xD2	/* Combined IRQ_MODE OR'ed with */
					/* LOCKOUT */
#define	FIQ_MODE		0x11	/* Fast Interrupt Mode (FIQ) */
#define	IRQ_BIT			0x80	/* Interrupt bit of CPSR and SPSR */
#define	FIQ_BIT			0x40	/* Interrupt bit of CPSR and SPSR */
#define	IRQ_BIT_OR_FIQ_BIT	0xC0	/* IRQ or FIQ interrupt bit of CPSR */
					/* and SPSR */
#define	ABORT_MODE		0x17
#define	UNDEF_MODE		0x1B

/*
 ********************************************
 *  TC_TCB and TC_HCB STRUCT OFFSET DEFINES *
 ********************************************
 */
#define	TC_CREATED		0x00	/* Node for linking to created task */
					/* list */
#define	TC_ID			0x0C	/* Internal TCB ID */
#define	TC_NAME			0x10	/* Task name */
#define	TC_STATUS		0x18	/* Task status */
#define	TC_DELAYED_SUSPEND	0x19	/* Delayed task suspension */
#define	TC_PRIORITY		0x1A	/* Task priority */
#define	TC_PREEMPTION		0x1B	/* Task preemption enable */
#define	TC_SCHEDULED		0x1C	/* Task scheduled count */
#define	TC_CUR_TIME_SLICE	0x20	/* Current time slice */
#define	TC_STACK_START		0x24	/* Stack starting address */
#define	TC_STACK_END		0x28	/* Stack ending address */
#define	TC_STACK_POINTER	0x2C	/* Task stack pointer */
#define	TC_STACK_SIZE		0x30	/* Task stack's size */
#define	TC_STACK_MINIMUM	0x34	/* Minimum stack size */
#define	TC_CURRENT_PROTECT	0x38	/* Current protection */
#define	TC_SAVED_STACK_PTR	0x3C	/* Previous stack pointer */
#define	TC_ACTIVE_NEXT		0x3C	/* Next activated HISR */
#define	TC_TIME_SLICE		0x40	/* Task time slice value */
#define	TC_ACTIVATION_COUNT	0x40	/* Activation counter */
#define	TC_HISR_ENTRY		0x44	/* HISR entry function */
#define	TC_HISR_SU_MODE		0x58	/* Sup/User mode indicator for HISRs */
#define	TC_HISR_MODULE		0x5C	/* Module identifier for HISR's */
#define	TC_SU_MODE		0xA8	/* Sup/User mode indicator for Tasks */
#define	TC_MODULE		0xAC	/* Module identifier for Tasks */