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31 * microblaze_init_dcache_range (unsigned int cache_start, unsigned int cache_len)
33 * Invalidate dcache on the microblaze
36 * 'cache_start' - address in the Dcache where invalidation begins
37 * 'cache_len' - length (in bytes) worth of Dcache to be invalidated
40 *******************************************************************************/
42 #include "xparameters.h"
44 #define MICROBLAZE_MSR_DCACHE_ENABLE 0x00000080
45 #define MICROBLAZE_MSR_INTR_ENABLE 0x00000002
47 #ifndef XPAR_MICROBLAZE_DCACHE_LINE_LEN
48 #define XPAR_MICROBLAZE_DCACHE_LINE_LEN 1
52 .globl microblaze_init_dcache_range
53 .ent microblaze_init_dcache_range
56 microblaze_init_dcache_range:
58 mfs r9, rmsr /* Disable Dcache and interrupts before invalidating */
59 andi r10, r9, ~(MICROBLAZE_MSR_DCACHE_ENABLE | MICROBLAZE_MSR_INTR_ENABLE)
62 andi r5, r5, -(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN) /* Align to cache line */
64 add r6, r5, r6 /* Compute end */
65 andi r6, r6, -(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN) /* Align to cache line */
68 wdc r5, r0 /* Invalidate the Cache (delay slot) */
70 cmpu r18, r5, r6 /* Are we at the end ? */
73 brid L_start /* Branch to the beginning of the loop */
74 addik r5, r5, (XPAR_MICROBLAZE_DCACHE_LINE_LEN * 4) /* Increment the addrees by 4 (delay slot) */
77 rtsd r15, 8 /* Return */
79 .end microblaze_init_dcache_range