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cpu_core.c
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cpu_core.c
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/*
*********************************************************************************************************
* uC/CPU
* CPU CONFIGURATION & PORT LAYER
*
* Copyright 2004-2021 Silicon Laboratories Inc. www.silabs.com
*
* SPDX-License-Identifier: APACHE-2.0
*
* This software is subject to an open source license and is distributed by
* Silicon Laboratories Inc. pursuant to the terms of the Apache License,
* Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
*
*********************************************************************************************************
*/
/*
*********************************************************************************************************
*
* CORE CPU MODULE
*
* Filename : cpu_core.c
* Version : V1.32.01
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* INCLUDE FILES
*********************************************************************************************************
*/
#define MICRIUM_SOURCE
#define CPU_CORE_MODULE
#include "cpu_core.h"
#if (CPU_CFG_CACHE_MGMT_EN == DEF_ENABLED)
#include "cpu_cache.h"
#endif
/*
*********************************************************************************************************
* LOCAL DEFINES
*********************************************************************************************************
*/
/* Pop cnt algorithm csts. */
#define CRC_UTIL_POPCNT_MASK01010101_32 0x55555555u
#define CRC_UTIL_POPCNT_MASK00110011_32 0x33333333u
#define CRC_UTIL_POPCNT_MASK00001111_32 0x0F0F0F0Fu
#define CRC_UTIL_POPCNT_POWERSOF256_32 0x01010101u
/*
*********************************************************************************************************
* LOCAL CONSTANTS
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL DATA TYPES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL TABLES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* CPU COUNT LEAD ZEROs LOOKUP TABLE
*
* Note(s) : (1) Index into bit pattern table determines the number of leading zeros in an 8-bit value :
*
* b07 b06 b05 b04 b03 b02 b01 b00 # Leading Zeros
* --- --- --- --- --- --- --- --- ---------------
* 1 x x x x x x x 0
* 0 1 x x x x x x 1
* 0 0 1 x x x x x 2
* 0 0 0 1 x x x x 3
* 0 0 0 0 1 x x x 4
* 0 0 0 0 0 1 x x 5
* 0 0 0 0 0 0 1 x 6
* 0 0 0 0 0 0 0 1 7
* 0 0 0 0 0 0 0 0 8
*********************************************************************************************************
*/
#if (!(defined(CPU_CFG_LEAD_ZEROS_ASM_PRESENT)) || \
(CPU_CFG_DATA_SIZE_MAX > CPU_CFG_DATA_SIZE))
static const CPU_INT08U CPU_CntLeadZerosTbl[256] = { /* Data vals : */
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
8u, 7u, 6u, 6u, 5u, 5u, 5u, 5u, 4u, 4u, 4u, 4u, 4u, 4u, 4u, 4u, /* 0x00 to 0x0F */
3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, 3u, /* 0x10 to 0x1F */
2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, /* 0x20 to 0x2F */
2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, 2u, /* 0x30 to 0x3F */
1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, /* 0x40 to 0x4F */
1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, /* 0x50 to 0x5F */
1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, /* 0x60 to 0x6F */
1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, /* 0x70 to 0x7F */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, /* 0x80 to 0x8F */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, /* 0x90 to 0x9F */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, /* 0xA0 to 0xAF */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, /* 0xB0 to 0xBF */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, /* 0xC0 to 0xCF */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, /* 0xD0 to 0xDF */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, /* 0xE0 to 0xEF */
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u /* 0xF0 to 0xFF */
};
#endif
/*
*********************************************************************************************************
* LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/
CPU_INT32U const CPU_EndiannessTest = 0x12345678LU; /* Variable to test CPU endianness. */
/*
*********************************************************************************************************
* LOCAL FUNCTION PROTOTYPES
*********************************************************************************************************
*/
#if (CPU_CFG_NAME_EN == DEF_ENABLED) /* ---------------- CPU NAME FNCTS ---------------- */
static void CPU_NameInit (void);
#endif
/* ----------------- CPU TS FNCTS ----------------- */
#if ((CPU_CFG_TS_EN == DEF_ENABLED) || \
(CPU_CFG_TS_TMR_EN == DEF_ENABLED))
static void CPU_TS_Init (void);
#endif
#ifdef CPU_CFG_INT_DIS_MEAS_EN /* ---------- CPU INT DIS TIME MEAS FNCTS --------- */
static void CPU_IntDisMeasInit (void);
static CPU_TS_TMR CPU_IntDisMeasMaxCalc(CPU_TS_TMR time_tot_cnts);
#endif
/*
*********************************************************************************************************
* LOCAL CONFIGURATION ERRORS
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* CPU_Init()
*
* Description : (1) Initialize CPU module :
*
* (a) Initialize CPU timestamps
* (b) Initialize CPU interrupts disabled time measurements
* (c) Initialize CPU host name
*
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : (2) CPU_Init() MUST be called ... :
*
* (a) ONLY ONCE from a product's application; ...
* (b) BEFORE product's application calls any core CPU module function(s)
*
* (3) The following initialization functions MUST be sequenced as follows :
*
* (a) CPU_TS_Init() SHOULD precede ALL calls to other CPU timestamp functions
*
* (b) CPU_IntDisMeasInit() SHOULD precede ALL calls to CPU_CRITICAL_ENTER()/CPU_CRITICAL_EXIT()
* & other CPU interrupts disabled time measurement functions
*********************************************************************************************************
*/
void CPU_Init (void)
{
/* --------------------- INIT TS ---------------------- */
#if ((CPU_CFG_TS_EN == DEF_ENABLED) || \
(CPU_CFG_TS_TMR_EN == DEF_ENABLED))
CPU_TS_Init(); /* See Note #3a. */
#endif
/* -------------- INIT INT DIS TIME MEAS -------------- */
#ifdef CPU_CFG_INT_DIS_MEAS_EN
CPU_IntDisMeasInit(); /* See Note #3b. */
#endif
/* ------------------ INIT CPU NAME ------------------- */
#if (CPU_CFG_NAME_EN == DEF_ENABLED)
CPU_NameInit();
#endif
#if (CPU_CFG_CACHE_MGMT_EN == DEF_ENABLED)
CPU_Cache_Init();
#endif
}
/*
*********************************************************************************************************
* CPU_SW_Exception()
*
* Description : Trap unrecoverable software exception.
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : (1) CPU_SW_Exception() deadlocks the current code execution -- whether multi-tasked/
* -processed/-threaded or single-threaded -- when the current code execution cannot
* gracefully recover or report a fault or exception condition.
*
* See also 'cpu_core.h CPU_SW_EXCEPTION() Note #1'.
*********************************************************************************************************
*/
void CPU_SW_Exception (void)
{
for (;;) {
;
}
}
/*
*********************************************************************************************************
* CPU_NameClr()
*
* Description : Clear CPU Name.
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : none.
*********************************************************************************************************
*/
#if (CPU_CFG_NAME_EN == DEF_ENABLED)
void CPU_NameClr (void)
{
CPU_SR_ALLOC();
CPU_CRITICAL_ENTER();
Mem_Clr((void *)&CPU_Name[0],
(CPU_SIZE_T) CPU_CFG_NAME_SIZE);
CPU_CRITICAL_EXIT();
}
#endif
/*
*********************************************************************************************************
* CPU_NameGet()
*
* Description : Get CPU host name.
*
* Argument(s) : p_name Pointer to an ASCII character array that will receive the return CPU host
* name ASCII string from this function (see Note #1).
*
* p_err Pointer to variable that will receive the return error code from this function :
*
* CPU_ERR_NONE CPU host name successfully returned.
* CPU_ERR_NULL_PTR Argument 'p_name' passed a NULL pointer.
*
* Return(s) : none.
*
* Note(s) : (1) The size of the ASCII character array that will receive the return CPU host name
* ASCII string :
*
* (a) MUST be greater than or equal to the current CPU host name's ASCII string
* size including the terminating NULL character;
* (b) SHOULD be greater than or equal to CPU_CFG_NAME_SIZE
*********************************************************************************************************
*/
#if (CPU_CFG_NAME_EN == DEF_ENABLED)
void CPU_NameGet (CPU_CHAR *p_name,
CPU_ERR *p_err)
{
CPU_SR_ALLOC();
if (p_err == (CPU_ERR *)0) {
CPU_SW_EXCEPTION(;);
}
if (p_name == (CPU_CHAR *)0) {
*p_err = CPU_ERR_NULL_PTR;
return;
}
CPU_CRITICAL_ENTER();
(void)Str_Copy_N(p_name,
&CPU_Name[0],
CPU_CFG_NAME_SIZE);
CPU_CRITICAL_EXIT();
*p_err = CPU_ERR_NONE;
}
#endif
/*
*********************************************************************************************************
* CPU_NameSet()
*
* Description : Set CPU host name.
*
* Argument(s) : p_name Pointer to CPU host name to set.
*
* p_err Pointer to variable that will receive the return error code from this function :
*
* CPU_ERR_NONE CPU host name successfully set.
* CPU_ERR_NULL_PTR Argument 'p_name' passed a NULL pointer.
* CPU_ERR_NAME_SIZE Invalid CPU host name size (see Note #1).
*
* Return(s) : none.
*
* Note(s) : (1) 'p_name' ASCII string size, including the terminating NULL character, MUST be less
* than or equal to CPU_CFG_NAME_SIZE.
*********************************************************************************************************
*/
#if (CPU_CFG_NAME_EN == DEF_ENABLED)
void CPU_NameSet (const CPU_CHAR *p_name,
CPU_ERR *p_err)
{
CPU_SIZE_T len;
CPU_SR_ALLOC();
if (p_err == (CPU_ERR *)0) {
CPU_SW_EXCEPTION(;);
}
if (p_name == (const CPU_CHAR *)0) {
*p_err = CPU_ERR_NULL_PTR;
return;
}
len = Str_Len_N(p_name,
CPU_CFG_NAME_SIZE);
if (len < CPU_CFG_NAME_SIZE) { /* If cfg name len < max name size, ... */
CPU_CRITICAL_ENTER();
(void)Str_Copy_N(&CPU_Name[0], /* ... copy cfg name to CPU host name. */
p_name,
CPU_CFG_NAME_SIZE);
CPU_CRITICAL_EXIT();
*p_err = CPU_ERR_NONE;
} else {
*p_err = CPU_ERR_NAME_SIZE;
}
}
#endif
/*
*********************************************************************************************************
* CPU_TS_Get32()
*
* Description : Get current 32-bit CPU timestamp.
*
* Argument(s) : none.
*
* Return(s) : Current 32-bit CPU timestamp (in timestamp timer counts).
*
* Note(s) : (1) When applicable, the amount of time measured by CPU timestamps is calculated by
* either of the following equations :
*
* (a) Time measured = Number timer counts * Timer period
*
* where
*
* Number timer counts Number of timer counts measured
* Timer period Timer's period in some units of
* (fractional) seconds
* Time measured Amount of time measured, in same
* units of (fractional) seconds
* as the Timer period
*
* Number timer counts
* (b) Time measured = ---------------------
* Timer frequency
*
* where
*
* Number timer counts Number of timer counts measured
* Timer frequency Timer's frequency in some units
* of counts per second
* Time measured Amount of time measured, in seconds
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2c1'.
*
* (2) In case the CPU timestamp timer has lower precision than the 32-bit CPU timestamp;
* its precision is extended via periodic updates by accumulating the deltas of the
* timestamp timer count values into the higher-precision 32-bit CPU timestamp.
*
* (3) After initialization, 'CPU_TS_32_Accum' & 'CPU_TS_32_TmrPrev' MUST ALWAYS
* be accessed AND updated exclusively with interrupts disabled -- but NOT
* with critical sections.
*********************************************************************************************************
*/
#if (CPU_CFG_TS_32_EN == DEF_ENABLED)
CPU_TS32 CPU_TS_Get32 (void)
{
CPU_TS32 ts;
#if (CPU_CFG_TS_TMR_SIZE < CPU_WORD_SIZE_32)
CPU_TS_TMR tmr_cur;
CPU_TS_TMR tmr_delta;
CPU_SR_ALLOC();
#endif
#if (CPU_CFG_TS_TMR_SIZE >= CPU_WORD_SIZE_32)
ts = (CPU_TS32)CPU_TS_TmrRd(); /* Get cur ts tmr val (in 32-bit ts cnts). */
#else
CPU_INT_DIS();
tmr_cur = (CPU_TS_TMR) CPU_TS_TmrRd(); /* Get cur ts tmr val (in ts tmr cnts). */
tmr_delta = (CPU_TS_TMR)(tmr_cur - CPU_TS_32_TmrPrev); /* Calc delta ts tmr cnts. */
CPU_TS_32_Accum += (CPU_TS32 ) tmr_delta; /* Inc ts by delta ts tmr cnts (see Note #2). */
CPU_TS_32_TmrPrev = (CPU_TS_TMR) tmr_cur; /* Save cur ts tmr cnts for next update. */
ts = (CPU_TS32 ) CPU_TS_32_Accum;
CPU_INT_EN();
#endif
return (ts);
}
#endif
/*
*********************************************************************************************************
* CPU_TS_Get64()
*
* Description : Get current 64-bit CPU timestamp.
*
* Argument(s) : none.
*
* Return(s) : Current 64-bit CPU timestamp (in timestamp timer counts).
*
* Note(s) : (1) When applicable, the amount of time measured by CPU timestamps is calculated by
* either of the following equations :
*
* (a) Time measured = Number timer counts * Timer period
*
* where
*
* Number timer counts Number of timer counts measured
* Timer period Timer's period in some units of
* (fractional) seconds
* Time measured Amount of time measured, in same
* units of (fractional) seconds
* as the Timer period
*
* Number timer counts
* (b) Time measured = ---------------------
* Timer frequency
*
* where
*
* Number timer counts Number of timer counts measured
* Timer frequency Timer's frequency in some units
* of counts per second
* Time measured Amount of time measured, in seconds
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2c1'.
*
* (2) In case the CPU timestamp timer has lower precision than the 64-bit CPU timestamp;
* its precision is extended via periodic updates by accumulating the deltas of the
* timestamp timer count values into the higher-precision 64-bit CPU timestamp.
*
* (3) After initialization, 'CPU_TS_64_Accum' & 'CPU_TS_64_TmrPrev' MUST ALWAYS
* be accessed AND updated exclusively with interrupts disabled -- but NOT
* with critical sections.
*********************************************************************************************************
*/
#if (CPU_CFG_TS_64_EN == DEF_ENABLED)
CPU_TS64 CPU_TS_Get64 (void)
{
CPU_TS64 ts;
#if (CPU_CFG_TS_TMR_SIZE < CPU_WORD_SIZE_64)
CPU_TS_TMR tmr_cur;
CPU_TS_TMR tmr_delta;
CPU_SR_ALLOC();
#endif
#if (CPU_CFG_TS_TMR_SIZE >= CPU_WORD_SIZE_64)
ts = (CPU_TS64)CPU_TS_TmrRd(); /* Get cur ts tmr val (in 64-bit ts cnts). */
#else
CPU_INT_DIS();
tmr_cur = (CPU_TS_TMR) CPU_TS_TmrRd(); /* Get cur ts tmr val (in ts tmr cnts). */
tmr_delta = (CPU_TS_TMR)(tmr_cur - CPU_TS_64_TmrPrev); /* Calc delta ts tmr cnts. */
CPU_TS_64_Accum += (CPU_TS64 ) tmr_delta; /* Inc ts by delta ts tmr cnts (see Note #2). */
CPU_TS_64_TmrPrev = (CPU_TS_TMR) tmr_cur; /* Save cur ts tmr cnts for next update. */
ts = (CPU_TS64 ) CPU_TS_64_Accum;
CPU_INT_EN();
#endif
return (ts);
}
#endif
/*
*********************************************************************************************************
* CPU_TS_Update()
*
* Description : Update current CPU timestamp(s).
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : (1) (a) CPU timestamp(s) MUST be updated periodically by some application (or BSP) time
* handler in order to (adequately) maintain CPU timestamp(s)' time.
*
* (b) CPU timestamp(s) MUST be updated more frequently than the CPU timestamp timer
* overflows; otherwise, CPU timestamp(s) will lose time.
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2c2'.
*********************************************************************************************************
*/
#if (CPU_CFG_TS_EN == DEF_ENABLED)
void CPU_TS_Update (void)
{
#if ((CPU_CFG_TS_32_EN == DEF_ENABLED) && \
(CPU_CFG_TS_TMR_SIZE < CPU_WORD_SIZE_32))
(void)CPU_TS_Get32();
#endif
#if ((CPU_CFG_TS_64_EN == DEF_ENABLED) && \
(CPU_CFG_TS_TMR_SIZE < CPU_WORD_SIZE_64))
(void)CPU_TS_Get64();
#endif
}
#endif
/*
*********************************************************************************************************
* CPU_TS_TmrFreqGet()
*
* Description : Get CPU timestamp's timer frequency.
*
* Argument(s) : p_err Pointer to variable that will receive the return error code from this function :
*
* CPU_ERR_NONE CPU timestamp's timer frequency successfully
* returned.
* CPU_ERR_TS_FREQ_INVALID CPU timestamp's timer frequency invalid &/or
* NOT yet configured.
*
* Return(s) : CPU timestamp's timer frequency (in Hertz), if NO error(s).
*
* 0, otherwise.
*
* Note(s) : none.
*********************************************************************************************************
*/
#if (CPU_CFG_TS_TMR_EN == DEF_ENABLED)
CPU_TS_TMR_FREQ CPU_TS_TmrFreqGet (CPU_ERR *p_err)
{
CPU_TS_TMR_FREQ freq_hz;
if (p_err == (CPU_ERR *)0) {
CPU_SW_EXCEPTION(0);
}
freq_hz = CPU_TS_TmrFreq_Hz;
*p_err = (freq_hz != 0u) ? CPU_ERR_NONE : CPU_ERR_TS_FREQ_INVALID;
return (freq_hz);
}
#endif
/*
*********************************************************************************************************
* CPU_TS_TmrFreqSet()
*
* Description : Set CPU timestamp's timer frequency.
*
* Argument(s) : freq_hz Frequency (in Hertz) to set for CPU timestamp's timer.
*
* Return(s) : none.
*
* Note(s) : (1) (a) (1) CPU timestamp timer frequency is NOT required for internal CPU timestamp
* operations but may OPTIONALLY be configured by CPU_TS_TmrInit() or other
* application/BSP initialization functions.
*
* (2) CPU timestamp timer frequency MAY be used with optional CPU_TSxx_to_uSec()
* to convert CPU timestamps from timer counts into microseconds.
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TSxx_to_uSec() Note #2a'.
*
* (b) CPU timestamp timer period SHOULD be less than the typical measured time but MUST
* be less than the maximum measured time; otherwise, timer resolution inadequate to
* measure desired times.
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TSxx_to_uSec() Note #2b'.
*********************************************************************************************************
*/
#if (CPU_CFG_TS_TMR_EN == DEF_ENABLED)
void CPU_TS_TmrFreqSet (CPU_TS_TMR_FREQ freq_hz)
{
CPU_TS_TmrFreq_Hz = freq_hz;
}
#endif
/*
*********************************************************************************************************
* CPU_IntDisMeasMaxCurReset()
*
* Description : Reset current maximum interrupts disabled time.
*
* Argument(s) : none.
*
* Return(s) : Maximum interrupts disabled time (in CPU timestamp timer counts) before resetting.
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2c'
* & 'cpu_core.h FUNCTION PROTOTYPES CPU_TSxx_to_uSec() Note #2'.
*
* Note(s) : (1) After initialization, 'CPU_IntDisMeasMaxCur_cnts' MUST ALWAYS be accessed
* exclusively with interrupts disabled -- but NOT with critical sections.
*********************************************************************************************************
*/
#ifdef CPU_CFG_INT_DIS_MEAS_EN
CPU_TS_TMR CPU_IntDisMeasMaxCurReset (void)
{
CPU_TS_TMR time_max_cnts;
CPU_SR_ALLOC();
time_max_cnts = CPU_IntDisMeasMaxCurGet();
CPU_INT_DIS();
CPU_IntDisMeasMaxCur_cnts = 0u;
CPU_INT_EN();
return (time_max_cnts);
}
#endif
/*
*********************************************************************************************************
* CPU_IntDisMeasMaxCurGet()
*
* Description : Get current maximum interrupts disabled time.
*
* Argument(s) : none.
*
* Return(s) : Current maximum interrupts disabled time (in CPU timestamp timer counts).
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2c'
* & 'cpu_core.h FUNCTION PROTOTYPES CPU_TSxx_to_uSec() Note #2'.
*
* Note(s) : (1) After initialization, 'CPU_IntDisMeasMaxCur_cnts' MUST ALWAYS be accessed
* exclusively with interrupts disabled -- but NOT with critical sections.
*********************************************************************************************************
*/
#ifdef CPU_CFG_INT_DIS_MEAS_EN
CPU_TS_TMR CPU_IntDisMeasMaxCurGet (void)
{
CPU_TS_TMR time_tot_cnts;
CPU_TS_TMR time_max_cnts;
CPU_SR_ALLOC();
CPU_INT_DIS();
time_tot_cnts = CPU_IntDisMeasMaxCur_cnts;
CPU_INT_EN();
time_max_cnts = CPU_IntDisMeasMaxCalc(time_tot_cnts);
return (time_max_cnts);
}
#endif
/*
*********************************************************************************************************
* CPU_IntDisMeasMaxGet()
*
* Description : Get (non-resetable) maximum interrupts disabled time.
*
* Argument(s) : none.
*
* Return(s) : (Non-resetable) maximum interrupts disabled time (in CPU timestamp timer counts).
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2c'
* & 'cpu_core.h FUNCTION PROTOTYPES CPU_TSxx_to_uSec() Note #2'.
*
* Note(s) : (1) After initialization, 'CPU_IntDisMeasMax_cnts' MUST ALWAYS be accessed
* exclusively with interrupts disabled -- but NOT with critical sections.
*********************************************************************************************************
*/
#ifdef CPU_CFG_INT_DIS_MEAS_EN
CPU_TS_TMR CPU_IntDisMeasMaxGet (void)
{
CPU_TS_TMR time_tot_cnts;
CPU_TS_TMR time_max_cnts;
CPU_SR_ALLOC();
CPU_INT_DIS();
time_tot_cnts = CPU_IntDisMeasMax_cnts;
CPU_INT_EN();
time_max_cnts = CPU_IntDisMeasMaxCalc(time_tot_cnts);
return (time_max_cnts);
}
#endif
/*
*********************************************************************************************************
* CPU_IntDisMeasStart()
*
* Description : Start interrupts disabled time measurement.
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : none.
*********************************************************************************************************
*/
#ifdef CPU_CFG_INT_DIS_MEAS_EN
void CPU_IntDisMeasStart (void)
{
CPU_IntDisMeasCtr++;
if (CPU_IntDisNestCtr == 0u) { /* If ints NOT yet dis'd, ... */
CPU_IntDisMeasStart_cnts = CPU_TS_TmrRd(); /* ... get ints dis'd start time. */
}
CPU_IntDisNestCtr++;
}
#endif
/*
*********************************************************************************************************
* CPU_IntDisMeasStop()
*
* Description : Stop interrupts disabled time measurement.
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : (1) (a) The total amount of time interrupts are disabled by system &/or application code
* during critical sections is calculated by the following equations :
*
* (1) When interrupts disabled time measurements are disabled :
*
*
* | CRITICAL | | CRITICAL |
* |<- SECTION ->| |<- SECTION ->|
* | ENTER | | EXIT |
*
* Disable Enable
* Interrupts Interrupts
*
* || || || ||
* || || || ||
* || | ||<------------------------->|| | ||
* || |<->|| | ||<----->| ||
* || | | || | || | | ||
* | | | | |
* interrupts time interrupts
* disabled interrupts |enabled
* | disabled |
* | (via application) |
* time time
* interrupts interrupts
* disabled ovrhd enabled ovrhd
*
*
* (A) time = [ time - time ] - time
* interrupts [ interrupts interrupts ] total
* disabled [ enabled disabled ] ovrhd
* (via application)
*
*
* (B) time = time + time
* total interrupts interrupts
* ovrhd enabled ovrhd disabled ovrhd
*
*
* where
*
* time time interrupts are disabled between
* interrupts first critical section enter &
* disabled last critical section exit (i.e.
* (via application) minus total overhead time)
*
* time time when interrupts are disabled
* interrupts
* disabled
*
* time time when interrupts are enabled
* interrupts
* enabled
*
*
* time total overhead time to disable/enable
* total interrupts during critical section
* ovrhd enter & exit
*
* time total overhead time to disable interrupts
* interrupts during critical section enter
* disabled ovrhd
*
* time total overhead time to enable interrupts
* interrupts during critical section exit
* enabled ovrhd
*
*
* (2) When interrupts disabled time measurements are enabled :
*
*
* | | | |
* |<----- CRITICAL SECTION ENTER ----->| |<------- CRITICAL SECTION EXIT ------->|
* | | | |
*
* Time Time
* Disable Measurement Measurement Enable
* Interrupts Start Stop Interrupts
*
* || | || || | ||
* || | || || | ||
* || | | ||<------------------------->|| | | ||
* || | | |<----------->|| | ||<------------->| | | ||
* || | | | | || | || | | | | ||
* | | | | | | |
* interrupts get | time | get interrupts
* disabled start time | interrupts | stop time enabled
* meas | disabled | meas
* time (via application) time
* start meas stop meas
* ovrhd ovrhd
*
*
* (A) time = [ time - time ] - time
* interrupts [ stop start ] total meas
* disabled [ meas meas ] ovrhd
* (via application)
*
*
* (B) time = time + time
* total meas start meas stop meas
* ovrhd ovrhd ovrhd
*
*
* where
*
* time time interrupts are disabled between first
* interrupts critical section enter & last critical
* disabled section exit (i.e. minus measurement
* (via application) overhead time; however, this does NOT
* include any overhead time to disable
* or enable interrupts during critical
* section enter & exit)
*
* time time of disable interrupts start time
* start measurement (in timer counts)
* meas
*
* time time of disable interrupts stop time
* stop measurement (in timer counts)
* meas
*
*
* time total overhead time to start/stop disabled
* total meas interrupts time measurements (in timer
* ovrhd counts)
*
* time total overhead time after getting start
* start meas time until end of start measurement
* ovrhd function (in timer counts)
*
* time total overhead time from beginning of stop
* stop meas measurement function until after getting
* ovrhd stop time (in timer counts)
*
*
* (b) (1) (A) In order to correctly handle unsigned subtraction overflows of start times
* from stop times, CPU timestamp timer count values MUST be returned via
* word-size-configurable 'CPU_TS_TMR' data type.
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2a'.
*
* (B) Since unsigned subtraction of start times from stop times assumes increasing
* values, timestamp timer count values MUST increase with each time count.
*
* See also 'cpu_core.h FUNCTION PROTOTYPES CPU_TS_TmrRd() Note #2b'.
*
* (2) (A) To expedite & reduce interrupts disabled time measurement overhead; only the
* subtraction of start times from stop times is performed.
*
* (B) The final calculations to subtract the interrupts disabled time measurement
* overhead is performed asynchronously in appropriate API functions.
*
* See also 'CPU_IntDisMeasMaxCalc() Note #1b'.
*********************************************************************************************************
*/
#ifdef CPU_CFG_INT_DIS_MEAS_EN
void CPU_IntDisMeasStop (void)
{
CPU_TS_TMR time_ints_disd_cnts;
CPU_IntDisNestCtr--;
if (CPU_IntDisNestCtr == 0u) { /* If ints NO longer dis'd, ... */
CPU_IntDisMeasStop_cnts = CPU_TS_TmrRd(); /* ... get ints dis'd stop time & ... */
/* ... calc ints dis'd tot time (see Note #1b2A). */
time_ints_disd_cnts = CPU_IntDisMeasStop_cnts -
CPU_IntDisMeasStart_cnts;
/* Calc max ints dis'd times. */
if (CPU_IntDisMeasMaxCur_cnts < time_ints_disd_cnts) {
CPU_IntDisMeasMaxCur_cnts = time_ints_disd_cnts;
}
if (CPU_IntDisMeasMax_cnts < time_ints_disd_cnts) {
CPU_IntDisMeasMax_cnts = time_ints_disd_cnts;
}
}
}
#endif
/*
*********************************************************************************************************
* CPU_CntLeadZeros()
*
* Description : Count the number of contiguous, most-significant, leading zero bits in a data value.
*
* Argument(s) : val Data value to count leading zero bits.
*
* Return(s) : Number of contiguous, most-significant, leading zero bits in 'val', if NO error(s).
*
* DEF_INT_CPU_U_MAX_VAL, otherwise.
*
* Note(s) : (1) (a) Supports the following data value sizes :
*
* (1) 8-bits
* (2) 16-bits
* (3) 32-bits
* (4) 64-bits
*
* See also 'cpu_def.h CPU WORD CONFIGURATION Note #1'.
*
* (b) (1) For 8-bit values :
*
* b07 b06 b05 b04 b03 b02 b01 b00 # Leading Zeros
* --- --- --- --- --- --- --- --- ---------------
* 1 x x x x x x x 0
* 0 1 x x x x x x 1
* 0 0 1 x x x x x 2
* 0 0 0 1 x x x x 3
* 0 0 0 0 1 x x x 4
* 0 0 0 0 0 1 x x 5
* 0 0 0 0 0 0 1 x 6
* 0 0 0 0 0 0 0 1 7
* 0 0 0 0 0 0 0 0 8
*
*
* (2) For 16-bit values :
*
* b15 b14 b13 ... b04 b03 b02 b01 b00 # Leading Zeros
* --- --- --- --- --- --- --- --- ---------------
* 1 x x x x x x x 0