cache.s

来自「OV7660驱动程序」· S 代码 · 共 59 行

#include "cache.inc"
#ifdef __GNUC__
.section .text
#else
.section program;
#endif
//void DCacheFlushInv(void* start,U32 count)

.global _DCacheInv;
.type _DCacheInv,STT_FUNC;
.align 8;
_DCacheInv:
	R2 = -32;
	R2 = R0 & R2;
	P0 = R2;
	R0 = R0 + R1;
	R0 += 31;
	R1 = -32;
	R0 = R0 & R1;
	R0 = R0 -R2;
	R0 >>= 5;
	P1 = R0;	
	LSETUP(_DCacheInv_LB,_DCacheInv_LE) LC0=P1;
		_DCacheInv_LB: FLUSHINV [P0++];		
		_DCacheInv_LE: SSYNC;
	
	RTS;
_DCacheFlushInv.end:
_DCacheInv.end:

//void DCacheFlush(void* start,U32 count)

.global _DCacheFlush;
.type _DCacheFlush,STT_FUNC;
.align 8;
_DCacheFlush:
#if DCACHE_MODE ==DCACHE_WB
	R2 = -32;
	R2 = R0 & R2;
	P0 = R2;//start
	R0 = R0 + R1;
	R0 += 31;
	R1 = -32;
	R0 = R0 & R1;//end
	R0 = R0 -R2;//len
	R0 >>= 5;
	P1 = R0;	
	LSETUP(_DCacheFlush_LB,_DCacheFlush_LE) LC0=P1;
		_DCacheFlush_LB: FLUSH [P0++];		
		_DCacheFlush_LE: SSYNC;
#else
	SSYNC;
#endif
	RTS;
_DCacheFlush.end: