void cp15_force_cache_coherence(UNS_32 *start_adr,
UNS_32 *end_adr)
{
register UNS_32 * addr;
/*******************************************************************
* Cache lines are 32-bytes (8 words); clean and invalidate each
* line of D-cache and invalidate each line of I-cache within the
* address range. Make sure addresses are 32-bit aligned.
******************************************************************/
for (addr = (UNS_32 *)((UNS_32)start_adr & 0xFFFFFFE0);
addr < end_adr;
addr += 8)
{
/* p15 is MMU coprocessor, Cache OPS is c7, TLB OPS is c8 */
#ifdef __GNUC__
asm("MOV r0, %0" : : "r"(addr));
/* Clean and Invalidate D-Cache single entry using MVA format */
asm("MCR p15, 0, r0, c7, c14, 1");
/* Invalidate I-Cache single entry using MVA format */
asm("MCR p15, 0, r0, c7, c5, 1");
#endif
#ifdef __ghs__
invalcache(addr);
#endif
#ifdef __arm
UNS_32 trx;
__asm
{
MOV trx, addr
/* Clean and Invalidate D-Cache single entry using MVA
format */
MCR p15, 0, trx, c7, c14, 1
/* Invalidate I-Cache single entry using MVA format */
MCR p15, 0, trx, c7, c5, 1
}
#endif
#ifdef __ICCARM__
/* Use IAR intrinsic functions */
__MCR(15, 0, (UNS_32)addr, 7, 14, 1);
__MCR(15, 0, (UNS_32)addr, 7, 5, 1);
#endif
}
/*******************************************************************
* Invalidate the I-TLB within the the address range. The I-TLB has
* 256 word granularity. Make sure addresses are '256 word' aligned.
******************************************************************/
for (addr = (UNS_32 *)((UNS_32)start_adr & 0xFFFFFC00);
addr < end_adr;
addr += 256)
{
#ifdef __GNUC__
asm("MOV r0, %0" : : "r"(addr));
/* Invalidate I-TLB using MVA format */
asm("MCR p15, 0, r0, c8, c5, 1");
asm("NOP");
asm("NOP");
#endif
#ifdef __ghs__
invaltlb(addr);
#endif
#ifdef __arm
UNS_32 trx;
__asm
{
MOV trx, addr
/* Invalidate I-TLB using MVA format */
MCR p15, 0, trx, c8, c5, 1
NOP
NOP
}
#endif
#ifdef __ICCARM__
/* Invalidate I-TLB using MVA format */
/* Use IAR intrinsic functions */
__MCR(15, 0, (UNS_32)addr, 8, 5, 1);
__no_operation();
__no_operation();
#endif
}
}
哪位大侠能帮忙分析一下这段程序，实在是不懂啊！
------解决方案--------------------------------------------------------
去嵌入式里面再问问吧