2 * Copyright 2016, Jack Miller, IBM Corp.
3 * Licensed under GPLv2.
12 #define SIZE (32 * 1024 * 1024) /* 32M */
13 #define LM_SIZE 0 /* Smallest encoding, 32M */
15 #define SECTIONS 64 /* 1 per bit in LMSER */
16 #define SECTION_SIZE (SIZE / SECTIONS)
17 #define SECTION_LONGS (SECTION_SIZE / sizeof(long))
19 static unsigned long *test_mem;
21 static int lmr_count = 0;
23 void ebb_lmr_handler(void)
28 void ldmx_full_section(unsigned long *mem, int section)
33 for (i = 0; i < SECTION_LONGS; i++) {
34 ptr = &mem[(SECTION_LONGS * section) + i];
35 ldmx((unsigned long) &ptr);
40 unsigned long section_masks[] = {
50 int ebb_lmr_section_test(unsigned long *mem)
52 unsigned long *mask = section_masks;
55 for (; *mask; mask++) {
56 mtspr(SPRN_LMSER, *mask);
57 printf("Testing mask 0x%016lx\n", mfspr(SPRN_LMSER));
59 for (i = 0; i < 64; i++) {
61 ldmx_full_section(mem, i);
62 if (*mask & (1UL << (63 - i)))
63 FAIL_IF(lmr_count != SECTION_LONGS);
76 SKIP_IF(!lmr_is_supported());
78 setup_ebb_handler(ebb_lmr_handler);
82 FAIL_IF(posix_memalign((void **)&test_mem, SIZE, SIZE) != 0);
86 FAIL_IF(mfspr(SPRN_LMSER) != 0);
88 mtspr(SPRN_LMRR, ((unsigned long)test_mem | LM_SIZE));
90 FAIL_IF(mfspr(SPRN_LMRR) != ((unsigned long)test_mem | LM_SIZE));
92 /* Read every single byte to ensure we get no false positives */
93 for (i = 0; i < SECTIONS; i++)
94 ldmx_full_section(test_mem, i);
96 FAIL_IF(lmr_count != 0);
98 /* Turn on the first section */
100 mtspr(SPRN_LMSER, (1UL << 63));
101 FAIL_IF(mfspr(SPRN_LMSER) != (1UL << 63));
103 /* Enable LM (BESCR) */
105 mtspr(SPRN_BESCR, mfspr(SPRN_BESCR) | BESCR_LME);
106 FAIL_IF(!(mfspr(SPRN_BESCR) & BESCR_LME));
108 ldmx((unsigned long)&test_mem);
110 FAIL_IF(lmr_count != 1); // exactly one exception
111 FAIL_IF(mfspr(SPRN_BESCR) & BESCR_LME); // LM now disabled
112 FAIL_IF(!(mfspr(SPRN_BESCR) & BESCR_LMEO)); // occurred bit set
114 printf("Simple LMR EBB OK\n");
116 /* This shouldn't cause an EBB since it's been disabled */
117 ldmx((unsigned long)&test_mem);
118 FAIL_IF(lmr_count != 1);
120 printf("LMR disable on EBB OK\n");
124 /* This should cause an EBB or reset is broken */
125 ldmx((unsigned long)&test_mem);
126 FAIL_IF(lmr_count != 2);
128 printf("LMR reset EBB OK\n");
132 return ebb_lmr_section_test(test_mem);
137 int ret = test_harness(ebb_lmr, "ebb_lmr");