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32 * File : microblaze_update_dcache.s
33 * Date : 2003, September 24
35 * Group : Emerging Software Technologies
38 * Update dcache on the microblaze.
39 * Takes in three parameters
42 * r7 : Lock/Valid information
43 * Bit 30 is Lock [ 1 indicates locked ]
44 * Bit 31 is Valid [ 1 indicates valid ]
46 * --------------------------------------------------------------
47 * | Lock | Valid | Effect
48 * --------------------------------------------------------------
49 * | 0 | 0 | Invalidate Cache
50 * | 0 | 1 | Valid, but unlocked cacheline
51 * | 1 | 0 | Invalidate Cache, No effect of lock
52 * | 1 | 1 | Valid cache. Locked to a
53 * | | | particular addrees
54 * --------------------------------------------------------------
57 **********************************************************************************/
58 #include "xparameters.h"
60 #ifndef XPAR_MICROBLAZE_DCACHE_LINE_LEN
61 #define XPAR_MICROBLAZE_DCACHE_LINE_LEN 1
65 .globl microblaze_update_dcache
66 .ent microblaze_update_dcache
68 microblaze_update_dcache:
70 #if XPAR_MICROBLAZE_DCACHE_LINE_LEN == 1
72 /* Read the MSR register into a temp register */
75 /* Clear the dcache enable bit to disable the cache
76 Register r10,r18 are volatile registers and hence do not need to be saved before use */
80 /* Update the lock and valid info */
81 andi r5, r5, 0xfffffffc
93 /* The only valid usage of this routine for larger cache line lengths is to invalidate a data cache line
94 So call microblaze_init_dcache_range appropriately to do the job */
96 brid microblaze_init_dcache_range
97 addik r6, r0, (XPAR_MICROBLAZE_DCACHE_LINE_LEN * 4)
99 /* We don't have a return instruction here. This is tail call optimization :) */
101 #endif /* XPAR_MICROBLAZE_DCACHE_LINE_LEN == 1 */
103 .end microblaze_update_dcache