331 lines
10 KiB
C
331 lines
10 KiB
C
/** @file */
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// xos_syslog.h - XOS Event logging module.
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// Copyright (c) 2003-2015 Cadence Design Systems, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// NOTE: Do not include this file directly in your application. Including
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// xos.h will automatically include this file.
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#ifndef __XOS_SYSLOG_H__
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#define __XOS_SYSLOG_H__
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#include "xos_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//-----------------------------------------------------------------------------
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// The XOS system log is an array of fixed size entries. The size of the log
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// is determined by the application, and memory for the log must be provided
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// at init time. Every time the log function is called, an entry is made in
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// the log and the next pointer advanced. When the log is full, it will wrap
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// around and start overwriting the oldest entries.
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// Logging can be done from C/C++ code as well as assembly code, and at any
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// interrupt level, even from high level interrupt handlers.
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Defines.
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//-----------------------------------------------------------------------------
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#define XOS_SYSLOG_ENABLED 0x0001
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///----------------------------------------------------------------------------
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///
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/// Use this macro to compute how much memory to allocate for the syslog.
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///
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///----------------------------------------------------------------------------
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#define XOS_SYSLOG_SIZE(num_entries) \
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( sizeof(XosSysLog) + ((num_entries - 1) * sizeof(XosSysLogEntry)) )
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///----------------------------------------------------------------------------
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///
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/// System log entry structure.
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///
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///----------------------------------------------------------------------------
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typedef struct XosSysLogEntry {
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uint32_t timestamp; ///< Timestamp in clock cycles
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uint32_t param1; ///< User defined value
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uint32_t param2; ///< User defined value
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struct XosSysLogEntry * next; ///< Link to next entry
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} XosSysLogEntry;
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///----------------------------------------------------------------------------
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///
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/// System log structure.
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///
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///----------------------------------------------------------------------------
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typedef struct XosSysLog {
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uint16_t flags; ///< Flags
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uint16_t size; ///< Number of entries
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XosSysLogEntry * next; ///< Next write position
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XosSysLogEntry entries[1]; ///< First entry
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} XosSysLog;
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//-----------------------------------------------------------------------------
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// Pointer to syslog area.
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//-----------------------------------------------------------------------------
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extern XosSysLog * xos_syslog;
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//----------------------------------------------------------------------------
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///
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/// Initialize the syslog. Initializing the log also enables it. The system
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/// log always wraps around when full and overwrites the oldest entries.
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///
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/// \param log_mem Pointer to allocated memory for the log.
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///
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/// \param num_entries The number of entries that the log can contain.
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///
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/// \return Returns nothing.
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///
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//----------------------------------------------------------------------------
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static inline void
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xos_syslog_init(void * log_mem, uint16_t num_entries)
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{
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uint16_t i;
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xos_syslog = (XosSysLog *) log_mem;
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xos_syslog->size = num_entries;
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xos_syslog->next = xos_syslog->entries;
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for (i = 0; i < num_entries - 1; i++) {
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xos_syslog->entries[i].next = &(xos_syslog->entries[i+1]);
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xos_syslog->entries[i].timestamp = 0;
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}
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xos_syslog->entries[i].next = xos_syslog->entries;
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xos_syslog->entries[i].timestamp = 0;
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xos_syslog->flags = XOS_SYSLOG_ENABLED;
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}
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///----------------------------------------------------------------------------
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///
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/// Reset the syslog. All entries made up to now are abandoned and the write
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/// pointer is set to the first entry location.
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///
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/// No parameters.
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///
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/// \return Returns nothing.
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///
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///----------------------------------------------------------------------------
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static inline void
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xos_syslog_clear()
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{
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#if XCHAL_HAVE_INTERRUPTS
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uint32_t ps = XT_RSIL(XCHAL_NUM_INTLEVELS);
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#endif
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xos_syslog_init(xos_syslog, xos_syslog->size);
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#if XCHAL_HAVE_INTERRUPTS
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xos_restore_int_pri_level(ps);
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#endif
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}
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///----------------------------------------------------------------------------
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///
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/// Enable logging to the syslog. This function needs to be called only if
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/// logging had been previously disabled via xos_syslog_disable(), since
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/// initializing the syslog automatically enables it.
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///
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/// No parameters.
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///
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/// \return Returns nothing.
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///
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///----------------------------------------------------------------------------
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static inline void
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xos_syslog_enable()
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{
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#if XCHAL_HAVE_INTERRUPTS
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uint32_t ps = XT_RSIL(XCHAL_NUM_INTLEVELS);
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#endif
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xos_syslog->flags |= XOS_SYSLOG_ENABLED;
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#if XCHAL_HAVE_INTERRUPTS
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xos_restore_int_pri_level(ps);
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#endif
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}
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///----------------------------------------------------------------------------
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///
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/// Disable logging to the syslog. It is sometimes useful to disable logging
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/// while the log is being examined or dumped.
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///
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/// No parameters.
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///
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/// \return Returns nothing.
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///
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///----------------------------------------------------------------------------
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static inline void
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xos_syslog_disable()
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{
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#if XCHAL_HAVE_INTERRUPTS
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uint32_t ps = XT_RSIL(XCHAL_NUM_INTLEVELS);
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#endif
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xos_syslog->flags &= ~XOS_SYSLOG_ENABLED;
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#if XCHAL_HAVE_INTERRUPTS
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xos_restore_int_pri_level(ps);
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#endif
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}
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///----------------------------------------------------------------------------
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///
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/// Write an entry into the syslog. This function does disable all interrupts
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/// since logging can be done from interrupt handlers as well. It will write
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/// into the log only if the log exists and is enabled.
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///
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/// \param param1 User defined value.
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///
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/// \param param2 User defined value.
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///
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/// \return Returns nothing.
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///
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///----------------------------------------------------------------------------
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static inline void
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xos_syslog_write(uint32_t param1, uint32_t param2)
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{
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if (xos_syslog != XOS_NULL) {
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#if XCHAL_HAVE_INTERRUPTS
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uint32_t ps = XT_RSIL(XCHAL_NUM_INTLEVELS);
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#endif
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if ((xos_syslog->flags & XOS_SYSLOG_ENABLED) != 0) {
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XosSysLogEntry * next = xos_syslog->next;
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next->timestamp = xos_get_ccount();
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next->param1 = param1;
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next->param2 = param2;
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xos_syslog->next = next->next;
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}
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#if XCHAL_HAVE_INTERRUPTS
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xos_restore_int_pri_level(ps);
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#endif
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}
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}
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///----------------------------------------------------------------------------
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///
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/// Read the first (oldest) entry in the syslog. Will return an error if the
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/// log has not been created or is empty. Storage to copy the entry must be
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/// provided by the caller.
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///
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/// \param entry Pointer to storage where the entry data will be
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/// copied. This pointer must be passed to
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/// xos_syslog_get_next().
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///
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/// \return Returns XOS_OK on success, else error code.
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///
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///----------------------------------------------------------------------------
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static inline int32_t
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xos_syslog_get_first(XosSysLogEntry * entry)
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{
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if (xos_syslog == XOS_NULL) {
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return XOS_ERR_NOT_FOUND;
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}
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if (entry != XOS_NULL) {
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#if XCHAL_HAVE_INTERRUPTS
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uint32_t ps = XT_RSIL(XCHAL_NUM_INTLEVELS);
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#endif
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XosSysLogEntry * next = xos_syslog->next;
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// 'next' should be pointing to the next entry to be overwritten, if we
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// have wrapped. This means it is the oldest entry. However if this entry
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// has a zero timestamp then we have not wrapped, in which case we must
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// look at the first entry in the list.
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if (next->timestamp == 0) {
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next = xos_syslog->entries;
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}
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*entry = *next;
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#if XCHAL_HAVE_INTERRUPTS
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xos_restore_int_pri_level(ps);
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#endif
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return entry->timestamp ? XOS_OK : XOS_ERR_NOT_FOUND;
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}
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return XOS_ERR_INVALID_PARAMETER;
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}
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///----------------------------------------------------------------------------
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///
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/// Get the next sequential entry from the syslog. This function must be called
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/// only after xos_syslog_get_first() has been called.
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///
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/// \param entry Pointer to storage where entry data will be copied.
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/// Must be the same pointer that was passed in the call
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/// to xos_syslog_get_first(), as it is used to keep track
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/// of the current position.
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///
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/// \return Returns XOS_OK on success, else error code.
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///
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///----------------------------------------------------------------------------
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static inline int32_t
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xos_syslog_get_next(XosSysLogEntry * entry)
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{
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if (entry != XOS_NULL) {
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#if XCHAL_HAVE_INTERRUPTS
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uint32_t ps = XT_RSIL(XCHAL_NUM_INTLEVELS);
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#endif
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XosSysLogEntry * next = entry->next;
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int32_t ret = XOS_OK;
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// Make sure we're not pointing past the last entry.
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if ((next != XOS_NULL) && (next != xos_syslog->next) && (next->timestamp != 0)) {
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*entry = *next;
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}
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else {
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ret = XOS_ERR_NOT_FOUND;
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}
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#if XCHAL_HAVE_INTERRUPTS
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xos_restore_int_pri_level(ps);
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#endif
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return ret;
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}
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return XOS_ERR_INVALID_PARAMETER;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif // __XOS_SYSLOG_H__
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