/*
 * Copyright (c) 2008-2012 Travis Geiselbrecht
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef __DEBUG_H
#define __DEBUG_H

#include <stdarg.h>
#include <stddef.h>
#include <compiler.h>
#include <platform/debug.h>
#include <printf.h>

__BEGIN_CDECLS

/*
 * It defines the debug level and restricts the number of prints that
 * is to be printed in release or debug builds.
 */
#if defined(DEBUG)
#define DEBUGLEVEL DEBUG
#else
#define DEBUGLEVEL 2
#endif

/* Various logging output mechanisms */

/* debug levels */
#define CRITICAL 0
#define ALWAYS 0
#define INFO 1
#define SPEW 2

/* Shared buffer size */
#define EARLYBUF_SIZE 4096

struct circular_buffer {
	uint32_t size; /* Indicates the total size of the buffer */
	uint32_t start; /* Starting point of valid data in buffer */
	uint32_t end; /* First character which is empty (can be written to) */
	uint32_t overflow; /* Indicator whether buffer has overflown or not */
	nsaddr_t buf;
};

extern char early_logbuf[EARLYBUF_SIZE];
extern int early_char_count;

#if !DISABLE_DEBUG_OUTPUT

/* input/output */
#define _dputc(c) platform_dputc(c)
int _dputs(const char *str);
int _dprintf(const char *fmt, ...) __PRINTFLIKE(1, 2);
int _dvprintf(const char *fmt, va_list ap);

/* dump memory */
void hexdump(const void *ptr, size_t len);
void hexdump8(const void *ptr, size_t len);

#else

/* input/output */
static inline void _dputc(char c) { }
static inline int _dputs(const char *str) { return 0; }
static inline int __PRINTFLIKE(1, 2) _dprintf(const char *fmt, ...) { return 0; }
static inline int _dvprintf(const char *fmt, va_list ap) { return 0; }

/* dump memory */
static inline void hexdump(const void *ptr, size_t len) { }
static inline void hexdump8(const void *ptr, size_t len) { }

#endif /* DISABLE_DEBUG_OUTPUT */

#define dputc(level, str) do { if ((level) <= DEBUGLEVEL) { _dputc(str); } } while (0)
#define dputs(level, str) do { if ((level) <= DEBUGLEVEL) { _dputs(str); } } while (0)
#define dprintf(level, x...) do { if ((level) <= DEBUGLEVEL) { _dprintf(x); } } while (0)
#define dvprintf(level, x...) do { if ((level) <= DEBUGLEVEL) { _dvprintf(x); } } while (0)

/* trace routines */
#define TRACE_ENTRY printf("%s: entry\n", __PRETTY_FUNCTION__)
#define TRACE_EXIT printf("%s: exit\n", __PRETTY_FUNCTION__)
#define TRACE_ENTRY_OBJ printf("%s: entry obj %p\n", __PRETTY_FUNCTION__, this)
#define TRACE_EXIT_OBJ printf("%s: exit obj %p\n", __PRETTY_FUNCTION__, this)
#define TRACE printf("%s:%d\n", __PRETTY_FUNCTION__, __LINE__)
#define TRACEF(str, x...) do { printf("%s:%d: " str, __PRETTY_FUNCTION__, __LINE__, ## x); } while (0)

/* trace routines that work if LOCAL_TRACE is set */
#define LTRACE_ENTRY do { if (LOCAL_TRACE) { TRACE_ENTRY; } } while (0)
#define LTRACE_EXIT do { if (LOCAL_TRACE) { TRACE_EXIT; } } while (0)
#define LTRACE do { if (LOCAL_TRACE) { TRACE; } } while (0)
#define LTRACEF(x...) do { if (LOCAL_TRACE) { TRACEF(x); } } while (0)

/* systemwide halts */
void halt(void) __NO_RETURN;

void _panic(void *caller, const char *fmt, ...) __PRINTFLIKE(2, 3) __NO_RETURN;
#define panic(x...) _panic(__GET_CALLER(), x)

#define PANIC_UNIMPLEMENTED panic("%s unimplemented\n", __PRETTY_FUNCTION__)

/* spin the cpu for a period of (short) time */
void spin(uint32_t usecs);

__END_CDECLS

#endif