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31 * microblaze_flush_dcache_range (unsigned int cacheaddr, unsigned int len)
33 * Flush a L1 DCache range
36 * 'cacheaddr' - address in the Dcache where the flush begins
37 * 'len ' - length (in bytes) worth of Dcache to be flushed
39 *******************************************************************************/
41 #include "xparameters.h"
43 #define MICROBLAZE_MSR_DCACHE_ENABLE 0x00000080
44 #define MICROBLAZE_MSR_INTR_ENABLE 0x00000002
46 #ifndef XPAR_MICROBLAZE_DCACHE_LINE_LEN
47 #define XPAR_MICROBLAZE_DCACHE_LINE_LEN 1
50 #ifndef XPAR_MICROBLAZE_DCACHE_USE_WRITEBACK
51 #define MB_VERSION_LT_v720
52 #define MB_HAS_WRITEBACK_SET 0
54 #define MB_HAS_WRITEBACK_SET XPAR_MICROBLAZE_DCACHE_USE_WRITEBACK
58 .globl microblaze_flush_dcache_range
59 .ent microblaze_flush_dcache_range
62 microblaze_flush_dcache_range:
64 #ifdef MB_VERSION_LT_v720 /* Disable Dcache and interrupts before invalidating */
66 andi r10, r9, ~(MICROBLAZE_MSR_DCACHE_ENABLE | MICROBLAZE_MSR_INTR_ENABLE)
70 beqi r6, L_done /* Skip loop if size is zero */
72 add r6, r5, r6 /* Compute end address */
75 andi r6, r6, -(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN) /* Align end down to cache line */
76 andi r5, r5, -(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN) /* Align start down to cache line */
78 #if MB_HAS_WRITEBACK_SET == 0 /* Use a different scheme for MB version < v7.20 or when caches are write-through */
81 cmpu r18, r5, r6 /* Are we at the end? */
84 wdc r5, r0 /* Invalidate the cache line */
86 brid L_start /* Branch to the beginning of the loop */
87 addik r5, r5, (XPAR_MICROBLAZE_DCACHE_LINE_LEN * 4) /* Increment the addrees by 4 (delay slot) */
90 /* r6 will now contain (count of bytes - (4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN)) */
92 wdc.flush r5, r6 /* Flush the cache line */
94 addik r6, r6, -(XPAR_MICROBLAZE_DCACHE_LINE_LEN * 4)
100 #ifdef MB_VERSION_LT_v720 /* restore MSR only for MB version < v7.20 */
105 .end microblaze_flush_dcache_range