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31 * File : microblaze_update_icache.s
32 * Date : 2003, September 24
34 * Group : Emerging Software Technologies
37 * Update icache on the microblaze.
38 * Takes in three parameters
41 * r7 : Lock/Valid information
42 * Bit 30 is Lock [ 1 indicates locked ]
43 * Bit 31 is Valid [ 1 indicates valid ]
45 * --------------------------------------------------------------
46 * | Lock | Valid | Effect
47 * --------------------------------------------------------------
48 * | 0 | 0 | Invalidate Cache
49 * | 0 | 1 | Valid, but unlocked cacheline
50 * | 1 | 0 | Invalidate Cache, No effect of lock
51 * | 1 | 1 | Valid cache. Locked to a
52 * | | | particular addrees
53 * --------------------------------------------------------------
56 **********************************************************************************/
57 #include "xparameters.h"
59 #ifndef XPAR_MICROBLAZE_ICACHE_LINE_LEN
60 #define XPAR_MICROBLAZE_ICACHE_LINE_LEN 1
64 .globl microblaze_update_icache
65 .ent microblaze_update_icache
67 microblaze_update_icache:
69 #if XPAR_MICROBLAZE_ICACHE_LINE_LEN == 1
71 /* Read the MSR register into a temp register */
74 /* Clear the icache enable bit to disable the cache
75 Register r10,r18 are volatile registers and hence do not need to be saved before use */
79 /* Update the lock and valid info */
80 andi r5, r5, 0xfffffffc
92 /* The only valid usage of this routine for larger cache line lengths is to invalidate an instruction cache line
93 So call microblaze_init_icache_range appropriately to do the job */
95 brid microblaze_init_icache_range
96 addik r6, r0, (XPAR_MICROBLAZE_ICACHE_LINE_LEN * 4)
98 /* We don't have a return instruction here. This is tail call optimization :) */
100 #endif /* XPAR_MICROBLAZE_ICACHE_LINE_LEN == 1 */
102 .end microblaze_update_icache