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rockbox/firmware/export/system.h
Michael Sevakis eefc7c73e2 Fix some problems with playback crashing 
I'm not sure all the situations it affects, to be honest. The fix
aimed to address the strange symptom here:
http://forums.rockbox.org/index.php/topic,50793.0.html

It turns out that ringbuf_add_cross was used when handles were
butted up against one another with the first parameter equal to
the last, which it interprets as being an empty case when it should
be interpreted as full in the context it was used. To fix this,
introduce full/empty variants of ringbuf_add_cross and ringbuf_sub
and use them at the appropriate time.

The other way to address the problem is ensure there's always at
least a space byte between the end of one handle and the start of
another but this make the code a bit trickier to reason about than
using additional function variants.

bufopen() may yield after creating a handle and so do some more
locking so that the buffering thread doesn't mess things up by
moving anything or not seeing the yet-to-be linked-in allocation.

Add alignof() macro to use proper method to get alignment of
struct memory_handle. That should be useful in general anyway.
It's merely defined as __alignof__ but looks nicer.

Change-Id: If21739eaa33a4f6c084a28ee5b3c8fceecfd87ce
2017-04-08 18:32:54 -04:00

343 lines
11 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Alan Korr
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef __SYSTEM_H__
#define __SYSTEM_H__
#include <stdbool.h>
#include <stdint.h>
#include "cpu.h"
#include "gcc_extensions.h" /* for LIKELY/UNLIKELY */
extern void system_reboot (void);
/* Called from any UIE handler and panicf - wait for a key and return
* to reboot system. */
extern void system_exception_wait(void);
extern void system_init(void);
extern long cpu_frequency;
struct flash_header {
unsigned long magic;
unsigned long length;
char version[32];
};
bool detect_flashed_romimage(void);
bool detect_flashed_ramimage(void);
bool detect_original_firmware(void);
#if defined(HAVE_ADJUSTABLE_CPU_FREQ) \
&& defined(ROCKBOX_HAS_LOGF) && (NUM_CORES == 1)
#define CPU_BOOST_LOGGING
#endif
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
#define FREQ cpu_frequency
void set_cpu_frequency(long frequency);
#ifdef CPU_BOOST_LOGGING
char * cpu_boost_log_getlog_first(void);
char * cpu_boost_log_getlog_next(void);
int cpu_boost_log_getcount(void);
void cpu_boost_(bool on_off, char* location, int line);
#else
void cpu_boost(bool on_off);
#endif
void cpu_idle_mode(bool on_off);
int get_cpu_boost_counter(void);
#else /* ndef HAVE_ADJUSTABLE_CPU_FREQ */
#ifndef FREQ
#define FREQ CPU_FREQ
#endif
#define set_cpu_frequency(frequency)
#define cpu_boost(on_off)
#define cpu_boost_id(on_off, id)
#define cpu_idle_mode(on_off)
#define get_cpu_boost_counter()
#define get_cpu_boost_tracker()
#endif /* HAVE_ADJUSTABLE_CPU_FREQ */
#ifdef CPU_BOOST_LOGGING
#define cpu_boost(on_off) cpu_boost_(on_off,__FILE__, __LINE__)
#endif
#define BAUDRATE 9600
/* wrap-safe macros for tick comparison */
#define TIME_AFTER(a,b) ((long)(b) - (long)(a) < 0)
#define TIME_BEFORE(a,b) TIME_AFTER(b,a)
#ifndef NULL
#define NULL ((void*)0)
#endif
#ifndef MIN
#define MIN(a, b) (((a)<(b))?(a):(b))
#endif
#ifndef MAX
#define MAX(a, b) (((a)>(b))?(a):(b))
#endif
/* return number of elements in array a */
#define ARRAYLEN(a) (sizeof(a)/sizeof((a)[0]))
/* is the given pointer "p" inside the said bounds of array "a"? */
#define PTR_IN_ARRAY(a, p, numelem) \
((uintptr_t)(p) - (uintptr_t)(a) < (uintptr_t)(numelem)*sizeof ((a)[0]))
/* return p incremented by specified number of bytes */
#define SKIPBYTES(p, count) ((typeof (p))((char *)(p) + (count)))
#define P2_M1(p2) ((1 << (p2))-1)
/* align up or down to nearest 2^p2 */
#define ALIGN_DOWN_P2(n, p2) ((n) & ~P2_M1(p2))
#define ALIGN_UP_P2(n, p2) ALIGN_DOWN_P2((n) + P2_M1(p2),p2)
/* align up or down to nearest integer multiple of a */
#define ALIGN_DOWN(n, a) ((typeof(n))((uintptr_t)(n)/(a)*(a)))
#define ALIGN_UP(n, a) ALIGN_DOWN((n)+((a)-1),a)
/* align start and end of buffer to nearest integer multiple of a */
#define ALIGN_BUFFER(ptr, size, align) \
({ \
size_t __sz = (size); \
size_t __ali = (align); \
uintptr_t __a1 = (uintptr_t)(ptr); \
uintptr_t __a2 = __a1 + __sz; \
__a1 = ALIGN_UP(__a1, __ali); \
__a2 = ALIGN_DOWN(__a2, __ali); \
(ptr) = (typeof (ptr))__a1; \
(size) = __a2 > __a1 ? __a2 - __a1 : 0; \
})
#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
#define PTR_ADD(ptr, x) ((typeof(ptr))((char*)(ptr) + (x)))
#define PTR_SUB(ptr, x) ((typeof(ptr))((char*)(ptr) - (x)))
#ifndef alignof
#define alignof __alignof__
#endif
/* Get the byte offset of a type's member */
#ifndef offsetof
#define offsetof(type, member) __builtin_offsetof(type, member)
#endif
/* Get the containing item of *ptr in type */
#ifndef container_of
#define container_of(ptr, type, member) ({ \
const typeof (((type *)0)->member) *__mptr = (ptr); \
(type *)((void *)(__mptr) - offsetof(type, member)); })
#endif
/* returns index of first set bit or 32 if no bits are set */
#if defined(CPU_ARM) && ARM_ARCH >= 5 && !defined(__thumb__)
static inline int find_first_set_bit(uint32_t val)
{ return LIKELY(val) ? __builtin_ctz(val) : 32; }
#else
int find_first_set_bit(uint32_t val);
#endif
static inline __attribute__((always_inline))
uint32_t isolate_first_bit(uint32_t val)
{ return val & -val; }
/* Functions to set and clear register or variable bits atomically */
void bitmod16(volatile uint16_t *addr, uint16_t bits, uint16_t mask);
void bitset16(volatile uint16_t *addr, uint16_t mask);
void bitclr16(volatile uint16_t *addr, uint16_t mask);
void bitmod32(volatile uint32_t *addr, uint32_t bits, uint32_t mask);
void bitset32(volatile uint32_t *addr, uint32_t mask);
void bitclr32(volatile uint32_t *addr, uint32_t mask);
/* gcc 3.4 changed the format of the constraints */
#if (__GNUC__ >= 3) && (__GNUC_MINOR__ > 3) || (__GNUC__ >= 4)
#define I_CONSTRAINT "I08"
#else
#define I_CONSTRAINT "I"
#endif
/* Utilize the user break controller to catch invalid memory accesses. */
int system_memory_guard(int newmode);
enum {
MEMGUARD_KEEP = -1, /* don't change the mode; for reading */
MEMGUARD_NONE = 0, /* catch nothing */
MEMGUARD_FLASH_WRITES, /* catch writes to area 02 (flash ROM) */
MEMGUARD_ZERO_AREA, /* catch all accesses to areas 00 and 01 */
MAXMEMGUARD
};
#if !defined(SIMULATOR) && !defined(__PCTOOL__)
#include "system-target.h"
#elif defined(HAVE_SDL) /* SDL build */
#include "system-sdl.h"
#ifdef SIMULATOR
#include "system-sim.h"
#endif
#elif defined(__PCTOOL__)
#include "system-hosted.h"
#endif
#include "bitswap.h"
#include "rbendian.h"
#ifndef ASSERT_CPU_MODE
/* Very useful to have defined properly for your architecture */
#define ASSERT_CPU_MODE(mode, rstatus...) \
({ (void)(mode); rstatus; })
#endif
#ifndef CPU_MODE_THREAD_CONTEXT
#define CPU_MODE_THREAD_CONTEXT 0
#endif
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
#ifndef CPU_BOOST_LOCK_DEFINED
#define CPU_BOOST_LOCK_DEFINED
/* Compatibility defauls */
static inline bool cpu_boost_lock(void)
{ return true; }
static inline void cpu_boost_unlock(void)
{ }
#endif /* CPU_BOOST_LOCK */
#endif /* HAVE_ADJUSTABLE_CPU_FREQ */
#ifndef BIT_N
#define BIT_N(n) (1U << (n))
#endif
#ifndef MASK_N
/* Make a mask of n contiguous bits, shifted left by 'shift' */
#define MASK_N(type, n, shift) \
((type)((((type)1 << (n)) - (type)1) << (shift)))
#endif
/* Declare this as HIGHEST_IRQ_LEVEL if they don't differ */
#ifndef DISABLE_INTERRUPTS
#define DISABLE_INTERRUPTS HIGHEST_IRQ_LEVEL
#endif
/* Define this, if the CPU may take advantage of cache aligment. Is enabled
* for all ARM CPUs. */
#ifdef CPU_ARM
#define HAVE_CPU_CACHE_ALIGN
#define MIN_STACK_ALIGN 8
#endif
#ifndef MIN_STACK_ALIGN
#define MIN_STACK_ALIGN (sizeof (uintptr_t))
#endif
/* Calculate CACHEALIGN_SIZE from CACHEALIGN_BITS */
#ifdef CACHEALIGN_SIZE
/* undefine, if defined. always calculate from CACHEALIGN_BITS */
#undef CACHEALIGN_SIZE
#endif
#ifdef CACHEALIGN_BITS
/* CACHEALIGN_SIZE = 2 ^ CACHEALIGN_BITS */
#define CACHEALIGN_SIZE (1u << CACHEALIGN_BITS)
#else
/* FIXME: set to maximum known cache alignment of supported CPUs */
#define CACHEALIGN_BITS 5
#define CACHEALIGN_SIZE 32
#endif
#ifdef HAVE_CPU_CACHE_ALIGN
/* Cache alignment attributes and sizes are enabled */
#define CACHEALIGN_ATTR __attribute__((aligned(CACHEALIGN_SIZE)))
/* Aligns x up to a CACHEALIGN_SIZE boundary */
#define CACHEALIGN_UP(x) \
((typeof (x))ALIGN_UP_P2((uintptr_t)(x), CACHEALIGN_BITS))
/* Aligns x down to a CACHEALIGN_SIZE boundary */
#define CACHEALIGN_DOWN(x) \
((typeof (x))ALIGN_DOWN_P2((uintptr_t)(x), CACHEALIGN_BITS))
/* Aligns at least to the greater of size x or CACHEALIGN_SIZE */
#define CACHEALIGN_AT_LEAST_ATTR(x) \
__attribute__((aligned(CACHEALIGN_UP(x))))
/* Aligns a buffer pointer and size to proper boundaries */
#define CACHEALIGN_BUFFER(start, size) \
ALIGN_BUFFER((start), (size), CACHEALIGN_SIZE)
#else
/* Cache alignment attributes and sizes are not enabled */
#define CACHEALIGN_ATTR
#define CACHEALIGN_AT_LEAST_ATTR(x) __attribute__((aligned(x)))
#define CACHEALIGN_UP(x) (x)
#define CACHEALIGN_DOWN(x) (x)
/* Make no adjustments */
#define CACHEALIGN_BUFFER(start, size)
#endif
/* Define MEM_ALIGN_ATTR which may be used to align e.g. buffers for faster
* access. */
#if defined(CPU_ARM)
/* Use ARMs cache alignment. */
#define MEM_ALIGN_ATTR CACHEALIGN_ATTR
#define MEM_ALIGN_SIZE CACHEALIGN_SIZE
#elif defined(CPU_COLDFIRE)
/* Use fixed alignment of 16 bytes. Speed up only for 'movem' in DRAM. */
#define MEM_ALIGN_ATTR __attribute__((aligned(16)))
#define MEM_ALIGN_SIZE 16
#else
/* Align pointer size */
#define MEM_ALIGN_ATTR __attribute__((aligned(sizeof(intptr_t))))
#define MEM_ALIGN_SIZE sizeof(intptr_t)
#endif
#define MEM_ALIGN_UP(x) \
((typeof (x))ALIGN_UP((uintptr_t)(x), MEM_ALIGN_SIZE))
#define MEM_ALIGN_DOWN(x) \
((typeof (x))ALIGN_DOWN((uintptr_t)(x), MEM_ALIGN_SIZE))
#ifdef STORAGE_WANTS_ALIGN
#define STORAGE_ALIGN_ATTR __attribute__((aligned(CACHEALIGN_SIZE)))
#define STORAGE_ALIGN_DOWN(x) \
((typeof (x))ALIGN_DOWN_P2((uintptr_t)(x), CACHEALIGN_BITS))
/* Pad a size so the buffer can be aligned later */
#define STORAGE_PAD(x) ((x) + CACHEALIGN_SIZE - 1)
/* Number of bytes in the last cacheline assuming buffer of size x is aligned */
#define STORAGE_OVERLAP(x) ((x) & (CACHEALIGN_SIZE - 1))
#define STORAGE_ALIGN_BUFFER(start, size) \
ALIGN_BUFFER((start), (size), CACHEALIGN_SIZE)
#else
#define STORAGE_ALIGN_ATTR
#define STORAGE_ALIGN_DOWN(x) (x)
#define STORAGE_PAD(x) (x)
#define STORAGE_OVERLAP(x) 0
#define STORAGE_ALIGN_BUFFER(start, size)
#endif
/* Double-cast to avoid 'dereferencing type-punned pointer will
* break strict aliasing rules' B.S. */
#define PUN_PTR(type, p) ((type)(intptr_t)(p))
#ifndef SIMULATOR
bool dbg_ports(void);
#endif
#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
bool dbg_hw_info(void);
#endif
#endif /* __SYSTEM_H__ */
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