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source: soft/giet_vm/giet_common/utils.c @ 400

Last change on this file since 400 was 399, checked in by alain, 10 years ago
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[258]	1	///////////////////////////////////////////////////////////////////////////////////
	2	// File : utils.c
	3	// Date : 18/10/2013
	4	// Author : alain greiner
	5	// Copyright (c) UPMC-LIP6
	6	///////////////////////////////////////////////////////////////////////////////////
	7	// The utils.c and utils.h files are part of the GIET-VM nano-kernel.
	8	// They define more or less the GIET-VM HAL (Hardware Abstraction Layer),
	9	// and contains various utility functions, that can be used by both the
	10	// boot code and the kernel code.
	11	///////////////////////////////////////////////////////////////////////////////////
	12
	13	#include <giet_config.h>
[324]	14	#include <hard_config.h>
[258]	15	#include <mapping_info.h>
	16	#include <utils.h>
	17	#include <ctx_handler.h>
	18	#include <tty_driver.h>
	19	#include <stdarg.h>
	20
	21	// This global variable is allocated in the boot.c file or in kernel_init.c file
[293]	22	extern static_scheduler_t* _schedulers[NB_PROCS_MAX<<(X_WIDTH+Y_WIDTH)];
[258]	23
	24
	25	///////////////////////////////////////////////////////////////////////////////////
[399]	26	// CP0 registers access functions
[258]	27	///////////////////////////////////////////////////////////////////////////////////
	28
	29	///////////////////////////////////////////////////////////////////////////////////
	30	// Returns the value contained in CP0 SCHED register
	31	// (virtual base address of the processor scheduler).
	32	///////////////////////////////////////////////////////////////////////////////////
[378]	33	unsigned int _get_sched()
[258]	34	{
	35	unsigned int ret;
[295]	36	asm volatile( "mfc0 %0, $4,2 \n"
	37	: "=r"(ret) );
[258]	38	return ret;
	39	}
	40	///////////////////////////////////////////////////////////////////////////////////
	41	// Returns EPC register content.
	42	///////////////////////////////////////////////////////////////////////////////////
[378]	43	unsigned int _get_epc()
[258]	44	{
	45	unsigned int ret;
[295]	46	asm volatile( "mfc0 %0, $14 \n"
	47	: "=r"(ret) );
[258]	48	return ret;
	49	}
	50	///////////////////////////////////////////////////////////////////////////////////
	51	// Returns BVAR register content.
	52	///////////////////////////////////////////////////////////////////////////////////
[378]	53	unsigned int _get_bvar()
[258]	54	{
	55	unsigned int ret;
[295]	56	asm volatile( "mfc0 %0, $8 \n"
	57	: "=r"(ret));
[258]	58	return ret;
	59	}
	60	///////////////////////////////////////////////////////////////////////////////////
	61	// Returns CR register content.
	62	///////////////////////////////////////////////////////////////////////////////////
[378]	63	unsigned int _get_cr()
[258]	64	{
	65	unsigned int ret;
[295]	66	asm volatile( "mfc0 %0, $13 \n"
	67	: "=r"(ret));
[258]	68	return ret;
	69	}
	70	///////////////////////////////////////////////////////////////////////////////////
	71	// Returns SR register content
	72	///////////////////////////////////////////////////////////////////////////////////
[378]	73	unsigned int _get_sr()
[258]	74	{
	75	unsigned int ret;
[295]	76	asm volatile( "mfc0 %0, $12 \n"
	77	: "=r"(ret));
[258]	78	return ret;
	79	}
[262]	80	//////////////////////////////////////////////////////////////////////////////
	81	// This function set a new value for the CP0 status register.
	82	//////////////////////////////////////////////////////////////////////////////
[378]	83	void _set_sr(unsigned int val)
[262]	84	{
[295]	85	asm volatile( "mtc0 %0, $12 \n"
	86	:
	87	:"r" (val) );
[262]	88	}
[295]	89	//////////////////////////////////////////////////////////////////////////////
[258]	90	// Returns processor index
[295]	91	//////////////////////////////////////////////////////////////////////////////
[378]	92	unsigned int _get_procid()
[258]	93	{
	94	unsigned int ret;
[295]	95	asm volatile ( "mfc0 %0, $15, 1 \n"
	96	:"=r" (ret) );
[258]	97	return (ret & 0x3FF);
	98	}
[295]	99	//////////////////////////////////////////////////////////////////////////////
[258]	100	// Returns local time (32 bits value)
	101	// boot_proctime()
[295]	102	//////////////////////////////////////////////////////////////////////////////
[378]	103	unsigned int _get_proctime()
[258]	104	{
	105	unsigned int ret;
[295]	106	asm volatile ( "mfc0 %0, $9 \n"
	107	:"=r" (ret) );
[258]	108	return ret;
	109	}
[295]	110	//////////////////////////////////////////////////////////////////////////////
	111	// Save SR value into save_sr_ptr variable and disable IRQs.
	112	//////////////////////////////////////////////////////////////////////////////
[378]	113	void _it_disable( unsigned int * save_sr_ptr)
[258]	114	{
[345]	115	unsigned int sr = 0;
[295]	116	asm volatile( "li $3, 0xFFFFFFFE \n"
	117	"mfc0 %0, $12 \n"
	118	"and $3, $3, %0 \n"
	119	"mtc0 $3, $12 \n"
[345]	120	: "+r"(sr)
[295]	121	:
[345]	122	: "$3" );
[295]	123	*save_sr_ptr = sr;
[258]	124	}
	125
	126	//////////////////////////////////////////////////////////////////////////////
[295]	127	// Restores previous SR value.
	128	//////////////////////////////////////////////////////////////////////////////
[378]	129	void _it_restore( unsigned int * save_sr_ptr )
[295]	130	{
	131	unsigned int sr = *save_sr_ptr;
	132	asm volatile( "mtc0 %0, $12 \n"
	133	:
[301]	134	: "r"(sr)
	135	: "memory" );
[295]	136	}
	137
	138	//////////////////////////////////////////////////////////////////////////////
[399]	139	// This function set a new value in CP0 SCHED register.
	140	// (virtual base address of the processor scheduler).
	141	//////////////////////////////////////////////////////////////////////////////
	142	void _set_sched(unsigned int val)
	143	{
	144	asm volatile ( "mtc0 %0, $4, 2 \n"
	145	:
	146	:"r" (val) );
	147	}
	148
	149	///////////////////////////////////////////////////////////////////////////////////
	150	// CP2 registers access functions
	151	///////////////////////////////////////////////////////////////////////////////////
	152
	153	///////////////////////////////////////////////////////////////////////////////////
	154	// Returns PTPR register content.
	155	///////////////////////////////////////////////////////////////////////////////////
	156	unsigned int _get_mmu_ptpr()
	157	{
	158	unsigned int ret;
	159	asm volatile( "mfc2 %0, $0 \n"
	160	: "=r"(ret) );
	161	return ret;
	162	}
	163	///////////////////////////////////////////////////////////////////////////////////
	164	// Returns MODE register content.
	165	///////////////////////////////////////////////////////////////////////////////////
	166	unsigned int _get_mmu_mode()
	167	{
	168	unsigned int ret;
	169	asm volatile( "mfc2 %0, $1 \n"
	170	: "=r"(ret) );
	171	return ret;
	172	}
	173	//////////////////////////////////////////////////////////////////////////////
[258]	174	// This function set a new value for the MMU PTPR register.
	175	//////////////////////////////////////////////////////////////////////////////
[378]	176	void _set_mmu_ptpr(unsigned int val)
[258]	177	{
[295]	178	asm volatile ( "mtc2 %0, $0 \n"
	179	:
[345]	180	:"r" (val)
	181	:"memory" );
[258]	182	}
	183	//////////////////////////////////////////////////////////////////////////////
	184	// This function set a new value for the MMU MODE register.
	185	//////////////////////////////////////////////////////////////////////////////
[378]	186	void _set_mmu_mode(unsigned int val)
[258]	187	{
[295]	188	asm volatile ( "mtc2 %0, $1 \n"
	189	:
[345]	190	:"r" (val)
	191	:"memory" );
[258]	192	}
	193
	194	////////////////////////////////////////////////////////////////////////////
	195	// Physical addressing related functions
	196	////////////////////////////////////////////////////////////////////////////
	197
	198	////////////////////////////////////////////////////////////////////////////
	199	// This function makes a physical read access to a 32 bits word in memory,
	200	// after a temporary DTLB de-activation and paddr extension.
	201	////////////////////////////////////////////////////////////////////////////
[378]	202	unsigned int _physical_read( unsigned long long paddr )
[258]	203	{
	204	unsigned int value;
	205	unsigned int lsb = (unsigned int) paddr;
	206	unsigned int msb = (unsigned int) (paddr >> 32);
[301]	207	unsigned int sr;
[258]	208
[301]	209	_it_disable(&sr);
[258]	210
[344]	211	asm volatile( "mfc2 $2, $1 \n" /* $2 <= MMU_MODE */
	212	"andi $3, $2, 0xb \n"
	213	"mtc2 $3, $1 \n" /* DTLB off */
[258]	214
[344]	215	"mtc2 %2, $24 \n" /* PADDR_EXT <= msb */
	216	"lw %0, 0(%1) \n" /* value <= paddr /
	217	"mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */
	218
	219	"mtc2 $2, $1 \n" /* restore MMU_MODE */
	220	: "=r" (value)
	221	: "r" (lsb), "r" (msb)
	222	: "$2", "$3" );
	223
[301]	224	_it_restore(&sr);
[258]	225	return value;
	226	}
	227	////////////////////////////////////////////////////////////////////////////
	228	// This function makes a physical write access to a 32 bits word in memory,
	229	// after a temporary DTLB de-activation and paddr extension.
	230	////////////////////////////////////////////////////////////////////////////
[378]	231	void _physical_write( unsigned long long paddr,
[399]	232	unsigned int value )
[258]	233	{
	234	unsigned int lsb = (unsigned int)paddr;
	235	unsigned int msb = (unsigned int)(paddr >> 32);
[301]	236	unsigned int sr;
[258]	237
[301]	238	_it_disable(&sr);
[258]	239
[344]	240	asm volatile( "mfc2 $2, $1 \n" /* $2 <= MMU_MODE */
	241	"andi $3, $2, 0xb \n"
	242	"mtc2 $3, $1 \n" /* DTLB off */
[258]	243
[344]	244	"mtc2 %2, $24 \n" /* PADDR_EXT <= msb */
	245	"sw %0, 0(%1) \n" /* paddr <= value /
	246	"mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */
	247
	248	"mtc2 $2, $1 \n" /* restore MMU_MODE */
[345]	249	"sync \n"
[344]	250	:
	251	: "r" (value), "r" (lsb), "r" (msb)
	252	: "$2", "$3" );
	253
[301]	254	_it_restore(&sr);
[258]	255	}
	256
[370]	257	////////////////////////////////////////////////////////////////////////////
	258	// This function makes a physical read access to a 64 bits word in memory,
	259	// after a temporary DTLB de-activation and paddr extension.
	260	////////////////////////////////////////////////////////////////////////////
[378]	261	unsigned long long _physical_read_ull( unsigned long long paddr )
[370]	262	{
	263	unsigned int data_lsb;
	264	unsigned int data_msb;
	265	unsigned int addr_lsb = (unsigned int) paddr;
	266	unsigned int addr_msb = (unsigned int) (paddr >> 32);
	267	unsigned int sr;
	268
	269	_it_disable(&sr);
	270
	271	asm volatile( "mfc2 $2, $1 \n" /* $2 <= MMU_MODE */
	272	"andi $3, $2, 0xb \n"
	273	"mtc2 $3, $1 \n" /* DTLB off */
	274
	275	"mtc2 %3, $24 \n" /* PADDR_EXT <= msb */
	276	"lw %0, 0(%2) \n" /* data_lsb <= paddr /
	277	"lw %1, 4(%2) \n" /* data_msb <= paddr+4 /
	278	"mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */
	279
	280	"mtc2 $2, $1 \n" /* restore MMU_MODE */
	281	: "=r" (data_lsb), "=r"(data_msb)
	282	: "r" (addr_lsb), "r" (addr_msb)
	283	: "$2", "$3" );
	284
	285	_it_restore(&sr);
	286
	287	return ( (((unsigned long long)data_msb)<<32) +
	288	(((unsigned long long)data_lsb)) );
	289	}
	290
	291	////////////////////////////////////////////////////////////////////////////
	292	// This function makes a physical write access to a 64 bits word in memory,
	293	// after a temporary DTLB de-activation and paddr extension.
	294	////////////////////////////////////////////////////////////////////////////
[378]	295	void _physical_write_ull( unsigned long long paddr,
[399]	296	unsigned long long value )
[370]	297	{
	298	unsigned int addr_lsb = (unsigned int)paddr;
	299	unsigned int addr_msb = (unsigned int)(paddr >> 32);
	300	unsigned int data_lsb = (unsigned int)value;
	301	unsigned int data_msb = (unsigned int)(value >> 32);
	302	unsigned int sr;
	303
	304	_it_disable(&sr);
	305
	306	asm volatile( "mfc2 $2, $1 \n" /* $2 <= MMU_MODE */
	307	"andi $3, $2, 0xb \n"
	308	"mtc2 $3, $1 \n" /* DTLB off */
	309
	310	"mtc2 %3, $24 \n" /* PADDR_EXT <= msb */
	311	"sw %0, 0(%2) \n" /* paddr <= value /
	312	"sw %1, 4(%2) \n" /* paddr+4 <= value /
	313	"mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */
	314
	315	"mtc2 $2, $1 \n" /* restore MMU_MODE */
	316	"sync \n"
	317	:
	318	: "r" (data_lsb), "r" (data_msb), "r" (addr_lsb), "r" (addr_msb)
	319	: "$2", "$3" );
	320
	321	_it_restore(&sr);
	322	}
	323
[258]	324	///////////////////////////////////////////////////////////////////////////////////
[344]	325	// This function makes a memcpy from a source buffer to a destination buffer
	326	// using physical addresses, after a temporary DTLB de-activation.
[399]	327	// source and destination buffers must be word aligned, and size must be
[344]	328	// multiple of 4 bytes.
	329	///////////////////////////////////////////////////////////////////////////////////
[378]	330	void _physical_memcpy( unsigned long long dst_paddr, // dest buffer paddr
[399]	331	unsigned long long src_paddr, // source buffer paddr
	332	unsigned int size ) // bytes
[344]	333	{
	334	// check alignment constraints
	335	if ( (dst_paddr & 3) \|\| (src_paddr & 3) \|\| (size & 3) )
	336	{
	337	_printf("\n[GIET ERROR] in _physical_memcpy() : buffer unaligned\n");
	338	_exit();
	339	}
	340
	341	unsigned int src_lsb = (unsigned int)src_paddr;
	342	unsigned int src_msb = (unsigned int)(src_paddr >> 32);
	343	unsigned int dst_lsb = (unsigned int)dst_paddr;
	344	unsigned int dst_msb = (unsigned int)(dst_paddr >> 32);
	345	unsigned int iter = size>>2;
	346	unsigned int data;
	347	unsigned int sr;
	348
	349	_it_disable(&sr);
	350
	351	asm volatile( "mfc2 $2, $1 \n" /* $2 <= current MMU_MODE */
	352	"andi $3, $2, 0xb \n" /* $3 <= new MMU_MODE */
	353	"mtc2 $3, $1 \n" /* DTLB off */
	354
	355	"move $4, %5 \n" /* $4 < iter */
	356	"move $5, %1 \n" /* $5 < src_lsb */
	357	"move $6, %3 \n" /* $6 < src_lsb */
	358
	359	"ph_memcpy_loop: \n"
	360	"mtc2 %2, $24 \n" /* PADDR_EXT <= src_msb */
	361	"lw %0, 0($5) \n" /* data <= src_paddr /
	362	"mtc2 %4, $24 \n" /* PADDR_EXT <= dst_msb */
	363	"sw %0, 0($6) \n" /* dst_paddr <= data /
	364
	365	"addi $4, $4, -1 \n" /* iter = iter - 1 */
	366	"addi $5, $5, 4 \n" /* src_lsb += 4 */
	367	"addi $6, $6, 4 \n" /* dst_lsb += 4 */
	368	"bne $4, $0, ph_memcpy_loop \n"
	369	"nop \n"
	370
	371	"mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */
	372	"mtc2 $2, $1 \n" /* restore MMU_MODE */
	373	: "=r" (data)
	374	: "r" (src_lsb), "r" (src_msb), "r" (dst_lsb), "r"(dst_msb), "r"(iter)
	375	: "$2", "$3", "$4", "$5", "$6" );
	376
	377	_it_restore(&sr);
	378	}
	379
	380	///////////////////////////////////////////////////////////////////////////////////
[314]	381	// This function is used by several drivers (_xxx_set_register() function)
[295]	382	// If the MMU is not activated, the virtual address is extended using
	383	// X_IO and Y_IO to reach the cluster_io.
	384	///////////////////////////////////////////////////////////////////////////////////
[378]	385	void _io_extended_write( unsigned int* vaddr,
[399]	386	unsigned int value )
[295]	387	{
	388	unsigned long long paddr;
	389
	390	if ( _get_mmu_mode() & 0x4 ) // MMU activated : use virtual address
	391	{
	392	*vaddr = value;
	393	}
	394	else // use paddr extension for IO
	395	{
	396	paddr = (unsigned long long)(unsigned int)vaddr +
	397	(((unsigned long long)((X_IO<<Y_WIDTH) + Y_IO))<<32);
	398	_physical_write( paddr, value );
	399	}
	400	asm volatile("sync" ::: "memory");
	401	}
	402
	403	///////////////////////////////////////////////////////////////////////////////////
	404	// This function is used by all drivers (_xxx_get_register() function)
	405	// If the MMU is not activated, the virtual address is extended using
	406	// X_IO and Y_IO to reach the cluster_io.
	407	///////////////////////////////////////////////////////////////////////////////////
[378]	408	unsigned int _io_extended_read( unsigned int* vaddr )
[295]	409	{
	410	unsigned long long paddr;
	411
	412	if ( _get_mmu_mode() & 0x4 ) // MMU activated : use virtual address
	413	{
	414	return (volatile unsigned int)vaddr;
	415	}
	416	else // use paddr extension for IO
	417	{
	418	paddr = (unsigned long long)(unsigned int)vaddr +
	419	(((unsigned long long)((X_IO<<Y_WIDTH) + Y_IO))<<32);
	420	return _physical_read( paddr );
	421	}
	422	}
	423
	424	///////////////////////////////////////////////////////////////////////////////////
[258]	425	// Locks access functions
	426	///////////////////////////////////////////////////////////////////////////////////
	427
	428	///////////////////////////////////////////////////////////////////////////////////
[314]	429	// Takes a lock with a blocking ll/sc atomic access.
	430	// When the cache coherence is granted by the hardware,
	431	// the first read is a standard (cacheable) lw, as the local copy
	432	// can be polled when the lock is already taken by another task, reducing
	433	// trafic on the interconnect. When the lock is released by the owner task,
	434	// the local copy is updated or invalidated by the coherence protocol.
	435	// If there is no hardware cache coherence a random delay is introduced
	436	// betwween two successive retry.
[258]	437	///////////////////////////////////////////////////////////////////////////////////
[378]	438	void _get_lock(giet_lock_t* lock)
[258]	439	{
[351]	440	register unsigned int* plock = &(lock->value);
	441
[314]	442	#if NO_HARD_CC
	443
[351]	444	register unsigned int delay = (_get_proctime() ^ _get_procid() << 4) & 0xFF;
	445	if (delay == 0) delay = 0x80;
[258]	446
	447	asm volatile (
	448	"_lock_llsc: \n"
[351]	449	" ll $2, 0(%0) \n" /* $2 <= lock current value */
	450	" bnez $2, _lock_delay \n" /* delay if lock already taken */
	451	" li $3, 1 \n" /* $3 <= argument for sc */
	452	" sc $3, 0(%0) \n" /* try to set lock */
	453	" bnez $3, _lock_ok \n" /* exit if atomic */
	454	" _lock_delay: \n"
	455	" move $4, %1 \n" /* $4 <= delay */
	456	" _lock_loop: \n"
	457	" addi $4, $4, -1 \n" /* $4 <= $4 - 1 */
	458	" bnez $4, _lock_loop \n" /* test end delay */
	459	" nop \n"
	460	" j _lock_llsc \n" /* retry */
	461	" nop \n"
	462	" _lock_ok: \n"
[258]	463	:
	464	:"r"(plock), "r"(delay)
[345]	465	:"$2", "$3", "$4", "memory");
[314]	466	#else
	467
	468	asm volatile (
	469	"_lock_llsc: \n"
[351]	470	" lw $2, 0(%0) \n" /* $2 <= lock current value */
	471	" bnez $2, _lock_llsc \n" /* retry if lock already taken */
[314]	472	" nop \n"
[351]	473	" ll $2, 0(%0) \n" /* ll_buffer <= lock current value */
	474	" bnez $2, _lock_llsc \n" /* retry if lock already taken */
	475	" li $3, 1 \n" /* $3 <= argument for sc */
	476	" sc $3, 0(%0) \n" /* try to set lock */
	477	" beqz $3, _lock_llsc \n" /* retry if sc failure */
[314]	478	" nop \n"
	479	:
	480	:"r"(plock)
[345]	481	:"$2", "$3", "memory");
[314]	482	#endif
	483
[258]	484	}
[295]	485
[258]	486	///////////////////////////////////////////////////////////////////////////////////
	487	// Release a previouly taken lock.
	488	///////////////////////////////////////////////////////////////////////////////////
[378]	489	void _release_lock(giet_lock_t* lock)
[258]	490	{
[295]	491	asm volatile ( "sync\n" ::: "memory" );
	492	// sync is necessary because of the TSAR consistency model
[351]	493	lock->value = 0;
[258]	494	}
	495
	496	///////////////////////////////////////////////////////////////////////////////////
[295]	497	// Access functions to system terminal TTY0
[258]	498	///////////////////////////////////////////////////////////////////////////////////
[295]	499
	500	///////////////////////////////////////////////////////////////////////////////////
	501	// Display "string" argument on TTY0.
	502	// It uses the low level access functions from TTY driver, using a busy waiting
	503	// policy if TTY buffer is full.
	504	// The exclusive access lock should be taken by the caller.
	505	///////////////////////////////////////////////////////////////////////////////////
	506	void _puts( char* string )
[258]	507	{
[295]	508	unsigned int n = 0;
	509
	510	while ( string[n] > 0 )
[258]	511	{
[295]	512	// test status register
	513	while ( (_tty_get_register( 0, TTY_STATUS ) & 0x2) );
	514
	515	// write one byte
[315]	516	if ( string[n] == '\n') {
	517	_tty_set_register( 0, TTY_WRITE, (unsigned int)'\r' );
	518	}
[295]	519	_tty_set_register( 0, TTY_WRITE, (unsigned int)string[n] );
	520	n++;
[258]	521	}
	522	}
	523
	524	///////////////////////////////////////////////////////////////////////////////////
[295]	525	// Display a 32 bits unsigned int as an hexadecimal string on TTY0.
[258]	526	///////////////////////////////////////////////////////////////////////////////////
[295]	527	void _putx( unsigned int val )
[258]	528	{
	529	static const char HexaTab[] = "0123456789ABCDEF";
	530	char buf[11];
	531	unsigned int c;
	532
	533	buf[0] = '0';
	534	buf[1] = 'x';
	535	buf[10] = 0;
	536
	537	for (c = 0; c < 8; c++)
	538	{
	539	buf[9 - c] = HexaTab[val & 0xF];
	540	val = val >> 4;
	541	}
[295]	542	_puts( buf );
[258]	543	}
	544
	545	///////////////////////////////////////////////////////////////////////////////////
[295]	546	// Display a 64 bits unsigned long as an hexadecimal string on TTY0.
[258]	547	///////////////////////////////////////////////////////////////////////////////////
[295]	548	void _putl( unsigned long long val )
[258]	549	{
	550	static const char HexaTab[] = "0123456789ABCDEF";
	551	char buf[19];
	552	unsigned int c;
	553
	554	buf[0] = '0';
	555	buf[1] = 'x';
	556	buf[18] = 0;
	557
	558	for (c = 0; c < 16; c++)
	559	{
	560	buf[17 - c] = HexaTab[(unsigned int)val & 0xF];
	561	val = val >> 4;
	562	}
[295]	563	_puts( buf );
[258]	564	}
	565
	566	///////////////////////////////////////////////////////////////////////////////////
[295]	567	// Display a 32 bits unsigned int as a decimal string on TTY0.
[258]	568	///////////////////////////////////////////////////////////////////////////////////
[295]	569	void _putd( unsigned int val )
[258]	570	{
	571	static const char DecTab[] = "0123456789";
	572	char buf[11];
	573	unsigned int i;
[351]	574	unsigned int first = 0;
[258]	575
	576	buf[10] = 0;
	577
[351]	578	for (i = 0; i < 10; i++)
	579	{
	580	if ((val != 0) \|\| (i == 0))
	581	{
[258]	582	buf[9 - i] = DecTab[val % 10];
	583	first = 9 - i;
	584	}
[351]	585	else
	586	{
[258]	587	break;
	588	}
	589	val /= 10;
	590	}
[295]	591	_puts( &buf[first] );
[258]	592	}
	593
	594	///////////////////////////////////////////////////////////////////////////////////
[295]	595	// Display a format on TTY0.
	596	// To provide an atomic display, this function takes the lock protecting
	597	// exclusive access to TTY0, entering a critical section until the lock
	598	// is released.
	599	// Only a limited number of formats are supported:
	600	// - %d : 32 bits signed decimal
	601	// - %u : 32 bits unsigned decimal
	602	// - %x : 32 bits unsigned hexa
	603	// - %l : 64 bits unsigned hexa
	604	// - %c : char
	605	// - %s : string
	606	///////////////////////////////////////////////////////////////////////////////////
	607	void _printf( char * format, ... )
	608	{
	609	va_list ap;
	610	va_start(ap, format);
[332]	611	unsigned int save_sr; // to save SR value in critical section
[295]	612
	613	// get TTY0 lock
	614	_tty_get_lock( 0, &save_sr );
	615
	616	printf_text:
	617
	618	while (*format)
	619	{
	620	unsigned int i;
	621	for (i = 0 ; format[i] && (format[i] != '%') ; i++);
	622	if (i)
	623	{
	624	if ( _tty_write( format, i, 0 ) != i ) goto return_error;
	625	format += i;
	626	}
	627	if (*format == '%')
	628	{
	629	format++;
	630	goto printf_arguments;
	631	}
	632	}
	633
	634	// release TTY0 lock
	635	_tty_release_lock( 0, &save_sr );
	636
	637	va_end(ap);
	638	return;
	639
	640	printf_arguments:
	641
	642	{
	643	char buf[20];
	644	char * pbuf;
	645	unsigned int len = 0;
	646	static const char HexaTab[] = "0123456789ABCDEF";
	647	unsigned int i;
	648
	649	switch (*format++)
	650	{
	651	case ('c'): /* char conversion */
	652	{
	653	int val = va_arg( ap, int );
	654	len = 1;
	655	buf[0] = val;
	656	pbuf = &buf[0];
	657	break;
	658	}
	659	case ('d'): /* 32 bits decimal signed */
	660	{
	661	int val = va_arg( ap, int );
	662	if (val < 0)
	663	{
	664	val = -val;
	665	if ( _tty_write( "-" , 1, 0 ) != 1 ) goto return_error;
	666	}
	667	for(i = 0; i < 10; i++)
	668	{
	669	buf[9 - i] = HexaTab[val % 10];
	670	if (!(val /= 10)) break;
	671	}
	672	len = i + 1;
	673	pbuf = &buf[9 - i];
	674	break;
	675	}
	676	case ('u'): /* 32 bits decimal unsigned */
	677	{
	678	unsigned int val = va_arg( ap, unsigned int );
	679	for(i = 0; i < 10; i++)
	680	{
	681	buf[9 - i] = HexaTab[val % 10];
	682	if (!(val /= 10)) break;
	683	}
	684	len = i + 1;
	685	pbuf = &buf[9 - i];
	686	break;
	687	}
	688	case ('x'): /* 32 bits hexadecimal unsigned */
	689	{
	690	unsigned int val = va_arg( ap, unsigned int );
	691	if ( _tty_write( "0x" , 2, 0 ) != 2 ) goto return_error;
	692	for(i = 0; i < 8; i++)
	693	{
	694	buf[7 - i] = HexaTab[val % 16];
	695	if (!(val /= 16)) break;
	696	}
	697	len = i + 1;
	698	pbuf = &buf[7 - i];
	699	break;
	700	}
	701	case ('l'): /* 64 bits hexadecimal unsigned */
	702	{
	703	unsigned long long val = va_arg( ap, unsigned long long );
	704	if ( _tty_write( "0x" , 2, 0 ) != 2 ) goto return_error;
	705	for(i = 0; i < 16; i++)
	706	{
	707	buf[15 - i] = HexaTab[val % 16];
	708	if (!(val /= 16)) break;
	709	}
	710	len = i + 1;
	711	pbuf = &buf[15 - i];
	712	break;
	713	}
	714	case ('s'): /* string */
	715	{
	716	char* str = va_arg( ap, char* );
	717	while (str[len])
	718	{
	719	len++;
	720	}
	721	pbuf = str;
	722	break;
	723	}
	724	default:
	725	goto return_error;
	726	}
	727
	728	if ( _tty_write( pbuf, len, 0 ) != len ) goto return_error;
	729
	730	goto printf_text;
	731	}
	732
	733	return_error:
	734
	735	{
	736	unsigned int procid = _get_procid();
	737	unsigned int lpid = procid % NB_PROCS_MAX;
	738	unsigned int cluster_xy = procid / NB_PROCS_MAX;
	739	unsigned int x = cluster_xy >> Y_WIDTH;
	740	unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
	741
	742	_puts("\n\n[GIET ERROR] in _printf() for processor[");
	743	_putd( x );
	744	_puts(",");
	745	_putd( y );
	746	_puts(",");
	747	_putd( lpid );
	748	_puts("]\n");
	749
	750	// release TTY0 lock
	751	_tty_release_lock( 0, &save_sr );
	752
	753	_exit();
	754	}
	755	}
	756
	757	///////////////////////////////////////////////////////////////////////////////////
	758	// Get a character from TTY0.
	759	///////////////////////////////////////////////////////////////////////////////////
	760	void _getc( char* byte )
	761	{
	762	// test status register
	763	while ( _tty_get_register( 0, TTY_STATUS ) == 0 );
	764
	765	// read one byte
	766	*byte = (char)_tty_get_register( 0, TTY_READ );
	767	}
	768
[258]	769
[399]	770	//////////////////////////////////////////////////////////////////////////////
	771	// Scheduler and tasks context access functions
	772	//////////////////////////////////////////////////////////////////////////////
[258]	773
[399]	774	//////////////////////////////////////////////////////////////////////////////
	775	// Returns index of the currently running task from the processor scheduler.
	776	//////////////////////////////////////////////////////////////////////////////
	777	unsigned int _get_current_task_id()
[258]	778	{
[399]	779	static_scheduler_t * psched = (static_scheduler_t *) _get_sched();
	780	return (unsigned int) (psched->current);
[258]	781	}
	782	////////////////////////////////////////////////////////////////////////////////////
	783	// This function returns the content of a context slot
[399]	784	// for a task identified by the ltid argument (local task index),
[258]	785	// and the gpid argument (global processor index)
	786	////////////////////////////////////////////////////////////////////////////////////
	787	unsigned int _get_task_slot( unsigned int gpid,
	788	unsigned int ltid,
	789	unsigned int slot )
	790	{
	791	static_scheduler_t* psched = (static_scheduler_t*)_schedulers[gpid];
	792	return psched->context[ltid][slot];
	793	}
	794	////////////////////////////////////////////////////////////////////////////////////
	795	// This function updates the content of a context slot
	796	// for any task identified by the ltid argument (local task index),
	797	// and the gpid argument (global processor index)
	798	////////////////////////////////////////////////////////////////////////////////////
	799	void _set_task_slot( unsigned int gpid,
	800	unsigned int ltid,
	801	unsigned int slot,
	802	unsigned int value )
	803	{
	804	static_scheduler_t* psched = (static_scheduler_t*)_schedulers[gpid];
	805	psched->context[ltid][slot] = value;
	806	}
	807	////////////////////////////////////////////////////////////////////////////////////
	808	// This function returns the content of a context slot
	809	// for the running task (defined by the scheduler current field).
	810	////////////////////////////////////////////////////////////////////////////////////
	811	unsigned int _get_context_slot( unsigned int slot )
	812	{
	813	static_scheduler_t* psched = (static_scheduler_t*)_get_sched();
	814	unsigned int task_id = psched->current;
	815	return psched->context[task_id][slot];
	816	}
	817	////////////////////////////////////////////////////////////////////////////////////
	818	// This function updates the content of a context slot for the running task.
	819	////////////////////////////////////////////////////////////////////////////////////
	820	void _set_context_slot( unsigned int slot,
	821	unsigned int value )
	822	{
	823	static_scheduler_t* psched = (static_scheduler_t*)_get_sched();
	824	unsigned int task_id = psched->current;
	825	psched->context[task_id][slot] = value;
	826	}
	827
	828	/////////////////////////////////////////////////////////////////////////////
	829	// Access functions to mapping_info data structure
	830	/////////////////////////////////////////////////////////////////////////////
[378]	831	mapping_cluster_t * _get_cluster_base(mapping_header_t * header)
[258]	832	{
	833	return (mapping_cluster_t ) ((char ) header +
	834	MAPPING_HEADER_SIZE);
	835	}
	836	/////////////////////////////////////////////////////////////////////////////
[378]	837	mapping_pseg_t * _get_pseg_base(mapping_header_t * header)
[258]	838	{
	839	return (mapping_pseg_t ) ((char ) header +
	840	MAPPING_HEADER_SIZE +
[263]	841	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE);
[258]	842	}
	843	/////////////////////////////////////////////////////////////////////////////
[378]	844	mapping_vspace_t * _get_vspace_base(mapping_header_t * header)
[258]	845	{
	846	return (mapping_vspace_t ) ((char ) header +
	847	MAPPING_HEADER_SIZE +
[263]	848	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	849	MAPPING_PSEG_SIZE * header->psegs);
	850	}
	851	/////////////////////////////////////////////////////////////////////////////
[378]	852	mapping_vseg_t * _get_vseg_base(mapping_header_t * header)
[258]	853	{
	854	return (mapping_vseg_t ) ((char ) header +
	855	MAPPING_HEADER_SIZE +
[263]	856	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	857	MAPPING_PSEG_SIZE * header->psegs +
	858	MAPPING_VSPACE_SIZE * header->vspaces);
	859	}
	860	/////////////////////////////////////////////////////////////////////////////
[378]	861	mapping_vobj_t * _get_vobj_base(mapping_header_t * header)
[258]	862	{
	863	return (mapping_vobj_t ) ((char ) header +
	864	MAPPING_HEADER_SIZE +
[263]	865	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	866	MAPPING_PSEG_SIZE * header->psegs +
	867	MAPPING_VSPACE_SIZE * header->vspaces +
	868	MAPPING_VSEG_SIZE * header->vsegs );
	869	}
	870	/////////////////////////////////////////////////////////////////////////////
[378]	871	mapping_task_t * _get_task_base(mapping_header_t * header)
[258]	872	{
	873	return (mapping_task_t ) ((char ) header +
	874	MAPPING_HEADER_SIZE +
[263]	875	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	876	MAPPING_PSEG_SIZE * header->psegs +
	877	MAPPING_VSPACE_SIZE * header->vspaces +
	878	MAPPING_VOBJ_SIZE * header->vobjs +
	879	MAPPING_VSEG_SIZE * header->vsegs);
	880	}
	881	/////////////////////////////////////////////////////////////////////////////
[378]	882	mapping_proc_t _get_proc_base(mapping_header_t header)
[258]	883	{
	884	return (mapping_proc_t ) ((char ) header +
	885	MAPPING_HEADER_SIZE +
[263]	886	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	887	MAPPING_PSEG_SIZE * header->psegs +
	888	MAPPING_VSPACE_SIZE * header->vspaces +
	889	MAPPING_VSEG_SIZE * header->vsegs +
	890	MAPPING_VOBJ_SIZE * header->vobjs +
	891	MAPPING_TASK_SIZE * header->tasks);
	892	}
	893	/////////////////////////////////////////////////////////////////////////////
[378]	894	mapping_irq_t _get_irq_base(mapping_header_t header)
[258]	895	{
	896	return (mapping_irq_t ) ((char ) header +
	897	MAPPING_HEADER_SIZE +
[263]	898	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	899	MAPPING_PSEG_SIZE * header->psegs +
	900	MAPPING_VSPACE_SIZE * header->vspaces +
	901	MAPPING_VSEG_SIZE * header->vsegs +
	902	MAPPING_VOBJ_SIZE * header->vobjs +
	903	MAPPING_TASK_SIZE * header->tasks +
	904	MAPPING_PROC_SIZE * header->procs);
	905	}
	906	/////////////////////////////////////////////////////////////////////////////
[378]	907	mapping_coproc_t _get_coproc_base(mapping_header_t header)
[258]	908	{
	909	return (mapping_coproc_t ) ((char ) header +
	910	MAPPING_HEADER_SIZE +
[263]	911	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	912	MAPPING_PSEG_SIZE * header->psegs +
	913	MAPPING_VSPACE_SIZE * header->vspaces +
	914	MAPPING_VOBJ_SIZE * header->vobjs +
	915	MAPPING_VSEG_SIZE * header->vsegs +
	916	MAPPING_TASK_SIZE * header->tasks +
	917	MAPPING_PROC_SIZE * header->procs +
	918	MAPPING_IRQ_SIZE * header->irqs);
	919	}
	920	///////////////////////////////////////////////////////////////////////////////////
[378]	921	mapping_cp_port_t _get_cp_port_base(mapping_header_t header)
[258]	922	{
	923	return (mapping_cp_port_t ) ((char ) header +
	924	MAPPING_HEADER_SIZE +
[263]	925	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	926	MAPPING_PSEG_SIZE * header->psegs +
	927	MAPPING_VSPACE_SIZE * header->vspaces +
	928	MAPPING_VOBJ_SIZE * header->vobjs +
	929	MAPPING_VSEG_SIZE * header->vsegs +
	930	MAPPING_TASK_SIZE * header->tasks +
	931	MAPPING_PROC_SIZE * header->procs +
	932	MAPPING_IRQ_SIZE * header->irqs +
	933	MAPPING_COPROC_SIZE * header->coprocs);
	934	}
	935	///////////////////////////////////////////////////////////////////////////////////
[378]	936	mapping_periph_t _get_periph_base(mapping_header_t header)
[258]	937	{
	938	return (mapping_periph_t ) ((char ) header +
	939	MAPPING_HEADER_SIZE +
[263]	940	MAPPING_CLUSTER_SIZE * X_SIZE * Y_SIZE +
[258]	941	MAPPING_PSEG_SIZE * header->psegs +
	942	MAPPING_VSPACE_SIZE * header->vspaces +
	943	MAPPING_VOBJ_SIZE * header->vobjs +
	944	MAPPING_VSEG_SIZE * header->vsegs +
	945	MAPPING_TASK_SIZE * header->tasks +
	946	MAPPING_PROC_SIZE * header->procs +
	947	MAPPING_IRQ_SIZE * header->irqs +
	948	MAPPING_COPROC_SIZE * header->coprocs +
	949	MAPPING_CP_PORT_SIZE * header->cp_ports);
	950	}
	951
[399]	952	///////////////////////////////////////////////////////////////////////////////////
	953	// Miscelaneous functions
	954	///////////////////////////////////////////////////////////////////////////////////
	955
	956	///////////////////////////////////////////////////////////////////////////////////
	957	// This function implements a pseudo-random delay.
	958	// The val argument define approximately an exponentially increasing mean delay,
	959	// and should not be larger than 32.
	960	///////////////////////////////////////////////////////////////////////////////////
	961	void _random_wait( unsigned int val )
	962	{
	963	unsigned int mask = (1<<(val&0x1F))-1;
	964	unsigned int delay = (_get_proctime() ^ (_get_procid()<<4)) & mask;
	965	asm volatile( "move $3, %0 \n"
	966	"loop_nic_completed: \n"
	967	"addi $3, $3, -1 \n"
	968	"bnez $3, loop_nic_completed \n"
	969	"nop \n"
	970	:
	971	: "r" (delay)
	972	: "$3" );
	973	}
	974	//////////////////////////////////////////////////////////////////////////////////
	975	// This function implements an interactive break for debug.
	976	// Execution continue when typing any character on TTY0.
	977	// The "str" argument is supposed to indicate the break location.
	978	//////////////////////////////////////////////////////////////////////////////////
	979	void _break( char* string )
	980	{
	981	char byte;
	982
	983	_printf("\n[GIET DEBUG] break from %s / continue ?\n", string );
	984	_getc( &byte );
	985	}
	986
	987	//////////////////////////////////////////////////////////////////////////////////
	988	// Processor suicide: infinite loop
	989	//////////////////////////////////////////////////////////////////////////////////
	990	__attribute__((noreturn))
	991	void _exit()
	992	{
	993	unsigned int procid = _get_procid();
	994	unsigned int lpid = procid % NB_PROCS_MAX;
	995	unsigned int cluster_xy = procid / NB_PROCS_MAX;
	996	unsigned int x = cluster_xy >> Y_WIDTH;
	997	unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1);
	998
	999
	1000	_printf("\n[GIET PANIC] processor[%d,%d,%d] suicide...\n", x, y, lpid );
	1001
	1002	while (1) { asm volatile ("nop"); }
	1003	}
	1004	///////////////////////////////////////////////////////////////////////////////////
	1005	// Compare two strings s1 & s2 (no more than n characters)
	1006	///////////////////////////////////////////////////////////////////////////////////
	1007	unsigned int _strncmp( const char * s1,
	1008	const char * s2,
	1009	unsigned int n )
	1010	{
	1011	unsigned int i;
	1012	for (i = 0; i < n; i++)
	1013	{
	1014	if (s1[i] != s2[i]) return 1;
	1015	if (s1[i] == 0) break;
	1016	}
	1017	return 0;
	1018	}
	1019
	1020	///////////////////////////////////////////////////////////////////////////////////
	1021	// Copy source string to dest string
	1022	///////////////////////////////////////////////////////////////////////////////////
	1023	char* _strcpy( char* dest, char* source )
	1024	{
	1025	if (!dest \|\| !source) return dest;
	1026
	1027	while (*source)
	1028	(dest++) = (source++);
	1029
	1030	return dest;
	1031	}
	1032
	1033	///////////////////////////////////////////////////////////////////////////////////
	1034	// Invalidate all data cache lines corresponding to a memory
	1035	// buffer (identified by an address and a size).
	1036	// TODO This should be replaced by a write to the CP2 MMU_DCACHE_INVAL
	1037	// register, to be more processor independant.
	1038	///////////////////////////////////////////////////////////////////////////////////
	1039	void _dcache_buf_invalidate( void * buffer,
	1040	unsigned int size)
	1041	{
	1042	unsigned int i;
	1043	unsigned int tmp;
	1044	unsigned int line_size;
	1045
	1046	// compute data cache line size based on config register (bits 12:10)
	1047	asm volatile(
	1048	"mfc0 %0, $16, 1"
	1049	: "=r" (tmp) );
	1050	tmp = ((tmp >> 10) & 0x7);
	1051	line_size = 2 << tmp;
	1052
	1053	// iterate on cache lines
	1054	for (i = 0; i < size; i += line_size)
	1055	{
	1056	asm volatile(
	1057	" cache %0, %1"
	1058	: :"i" (0x11), "R" (((unsigned char ) buffer + i)) );
	1059	}
	1060	}
	1061	///////////////////////////////////////////////////////////////////////////////////
	1062	// This function returns the information associated to a heap : vaddr and length.
	1063	// - If (x < X_SIZE) and (y < Y_SIZE), it return the heap associated to any task
	1064	// running in cluster(x,y).
	1065	// - Else, it return the heap associated to the calling task.
	1066	// It uses the global task index (CTX_GTID_ID, unique for each giet task) and the
	1067	// vspace index (CTX_VSID_ID), that are defined in the calling task context
	1068	// to find the vobj_id containing the heap.
	1069	// Return 0 if success. Return non zero if not found.
	1070	///////////////////////////////////////////////////////////////////////////////////
	1071	unsigned int _heap_info( unsigned int* vaddr,
	1072	unsigned int* length,
	1073	unsigned int x,
	1074	unsigned int y )
	1075	{
	1076	mapping_header_t * header = (mapping_header_t *)SEG_BOOT_MAPPING_BASE;
	1077	mapping_task_t * tasks = _get_task_base(header);
	1078	mapping_vobj_t * vobjs = _get_vobj_base(header);
	1079	mapping_vspace_t * vspaces = _get_vspace_base(header);
	1080
	1081	unsigned int task_id;
	1082	unsigned int vspace_id;
	1083	unsigned int vobj_id = 0xFFFFFFFF;
	1084
	1085	// searching the heap vobj_id
	1086	if ( (x < X_SIZE) && (y < Y_SIZE) ) // searching a task in cluster(x,y)
	1087	{
	1088	// get vspace global index
	1089	vspace_id = _get_context_slot(CTX_VSID_ID);
	1090
	1091	// scan all tasks in vspace
	1092	unsigned int min = vspaces[vspace_id].task_offset ;
	1093	unsigned int max = min + vspaces[vspace_id].tasks ;
	1094	for ( task_id = min ; task_id < max ; task_id++ )
	1095	{
	1096	if ( tasks[task_id].clusterid == (x * Y_SIZE + y) )
	1097	{
	1098	vobj_id = tasks[task_id].heap_vobj_id;
	1099	if ( vobj_id != 0xFFFFFFFF ) break;
	1100	}
	1101	}
	1102	}
	1103	else // searching in the calling task
	1104	{
	1105	task_id = _get_context_slot(CTX_GTID_ID);
	1106	vobj_id = tasks[task_id].heap_vobj_id;
	1107	}
	1108
	1109	// analysing the vobj_id
	1110	if ( vobj_id != 0xFFFFFFFF )
	1111	{
	1112	*vaddr = vobjs[vobj_id].vaddr;
	1113	*length = vobjs[vobj_id].length;
	1114	return 0;
	1115	}
	1116	else
	1117	{
	1118	*vaddr = 0;
	1119	*length = 0;
	1120	return 1;
	1121	}
	1122	} // end _heap_info()
	1123
	1124
	1125	///////////////////////////////////////////////////////////////////////////////////
	1126	// Required by GCC
	1127	///////////////////////////////////////////////////////////////////////////////////
	1128
	1129	///////////////////////////////////////////////////////////////////////////////////
	1130	// Copy a source memory buffer content to a dest memory buffer (size bytes)
	1131	// Code taken from MutekH.
	1132	///////////////////////////////////////////////////////////////////////////////////
	1133	void* memcpy( void* dest, // dest buffer vbase
	1134	const void* source, // source buffer vbase
	1135	unsigned int size ) // bytes
	1136	{
	1137	unsigned int* idst = (unsigned int*)dest;
	1138	unsigned int* isrc = (unsigned int*)source;
	1139
	1140	// word-by-word copy
	1141	if (!((unsigned int) idst & 3) && !((unsigned int) isrc & 3))
	1142	{
	1143	while (size > 3)
	1144	{
	1145	idst++ = isrc++;
	1146	size -= 4;
	1147	}
	1148	}
	1149
	1150	unsigned char* cdst = (unsigned char*)dest;
	1151	unsigned char* csrc = (unsigned char*)source;
	1152
	1153	/* byte-by-byte copy */
	1154	while (size--)
	1155	{
	1156	cdst++ = csrc++;
	1157	}
	1158	return dest;
	1159	}
	1160	//////////////////////////////////////////////////////////////////////////////////
	1161	// Fill a byte string with a byte value.
	1162	//////////////////////////////////////////////////////////////////////////////////
	1163	void * memset( void* dest,
	1164	int value,
	1165	unsigned int count )
	1166	{
	1167	// word-by-word copy
	1168	unsigned int* idst = dest;
	1169	unsigned int data = (((unsigned char)value) ) \|
	1170	(((unsigned char)value) << 8) \|
	1171	(((unsigned char)value) << 16) \|
	1172	(((unsigned char)value) << 24) ;
	1173
	1174	if ( ! ((unsigned int)idst & 3) )
	1175	{
	1176	while ( count > 3 )
	1177	{
	1178	*idst++ = data;
	1179	count -= 4;
	1180	}
	1181	}
	1182
	1183	// byte-by-byte copy
	1184	unsigned char* cdst = dest;
	1185	while (count--)
	1186	{
	1187	*cdst++ = (unsigned char)value;
	1188	}
	1189	return dest;
	1190	}
	1191
	1192
[258]	1193	// Local Variables:
	1194	// tab-width: 4
	1195	// c-basic-offset: 4
	1196	// c-file-offsets:((innamespace . 0)(inline-open . 0))
	1197	// indent-tabs-mode: nil
	1198	// End:
	1199	// vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4
	1200

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