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32 * microblaze_invalidate_dcache_range (unsigned int cacheaddr, unsigned int len)
34 * Invalidate a Dcache range
37 * 'cacheaddr' - address in the Dcache where invalidation begins
38 * 'len ' - length (in bytes) worth of Dcache to be invalidated
41 *******************************************************************************/
43 #include "xparameters.h"
45 #define MICROBLAZE_MSR_DCACHE_ENABLE 0x00000080
46 #define MICROBLAZE_MSR_INTR_ENABLE 0x00000002
48 #ifndef XPAR_MICROBLAZE_DCACHE_LINE_LEN
49 #define XPAR_MICROBLAZE_DCACHE_LINE_LEN 1
52 #ifndef XPAR_MICROBLAZE_DCACHE_USE_WRITEBACK
53 #define MB_VERSION_LT_v720
54 #define MB_HAS_WRITEBACK_SET 0
56 #define MB_HAS_WRITEBACK_SET XPAR_MICROBLAZE_DCACHE_USE_WRITEBACK
60 .globl microblaze_invalidate_dcache_range
61 .ent microblaze_invalidate_dcache_range
64 microblaze_invalidate_dcache_range:
67 #ifdef MB_VERSION_LT_v720 /* Disable Dcache and interrupts before invalidating */
69 andi r10, r9, ~(MICROBLAZE_MSR_DCACHE_ENABLE | MICROBLAZE_MSR_INTR_ENABLE)
73 beqi r6, L_done /* Skip loop if size is zero */
75 add r6, r5, r6 /* Compute end address */
78 andi r6, r6, -(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN) /* Align end down to cache line */
79 andi r5, r5, -(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN) /* Align start down to cache line */
81 #if MB_HAS_WRITEBACK_SET == 0 /* Use a different scheme for MB version < v7.20 or when caches are write-through */
84 cmpu r18, r5, r6 /* Are we at the end? */
89 brid L_start /* Branch to the beginning of the loop */
90 addik r5, r5, (XPAR_MICROBLAZE_DCACHE_LINE_LEN * 4) /* Increment the addrees by 4 (delay slot) */
94 /* r6 will now contain (count of bytes - (4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN)) */
96 wdc.clear r5, r6 /* Invalidate the cache line only if the address matches */
98 addik r6, r6, -(XPAR_MICROBLAZE_DCACHE_LINE_LEN * 4)
104 #ifdef MB_VERSION_LT_v720 /* restore MSR only for MB version < v7.20 */
109 .end microblaze_invalidate_dcache_range