Hi Dave & Haren,
Here are the changes I made to "crash" to function with PPC64
64k pagesize. Instead of adding whole set of indexs, shifts,
masks, macros and new vtop() routines - I generalized 4-level
pagetable support and set & compute indexes, shift and masks
correctly for 4K and 64K.
Tested with 4K pagesize and 64K pagesize kernels on PPC64.
Please review.
Thanks,
Badari
--- crash/defs.h 2005-11-17 10:45:13.000000000 -0800
+++ new/defs.h 2005-11-17 11:23:18.000000000 -0800
@@ -2101,23 +2101,14 @@ struct efi_memory_desc_t {
#define PGD_OFFSET(vaddr) ((vaddr >> PGDIR_SHIFT) & 0x7ff)
#define PMD_OFFSET(vaddr) ((vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
-/* 4-level page table changes */
-#define PGDIR_SHIFT_L4 (PMD_SHIFT + (machdep->pageshift - 5))
-#define L4_SHIFT (PGDIR_SHIFT_L4 + (machdep->pageshift - 5))
-
-#define PTE_SHIFT_L4 17
-
-#define PTE_INDEX_SIZE_L4 9
-#define PMD_INDEX_SIZE_L4 7
-#define PGD_INDEX_SIZE_L4 7
-
-#define PTRS_PER_PTE_L4 (1 << PTE_INDEX_SIZE_L4)
-#define PTRS_PER_PMD_L4 (1 << PMD_INDEX_SIZE_L4)
-#define PTRS_PER_PGD_L4 (1 << PGD_INDEX_SIZE_L4)
-
-#define L4_OFFSET(vaddr) ((vaddr >> L4_SHIFT) & 0x1ff)
-#define PGD_OFFSET_L4(vaddr) ((vaddr >> PGDIR_SHIFT_L4) & (PTRS_PER_PGD_L4 - 1))
-#define PMD_OFFSET_L4(vaddr) ((vaddr >> PMD_SHIFT) & (PTRS_PER_PMD_L4 - 1))
+/* 4-level page table support */
+#define L4_OFFSET(vaddr) ((vaddr >> (machdep->machspec->l4_shift)) & 0x1ff)
+
+#define PGD_OFFSET_L4(vaddr) \
+ ((vaddr >> (machdep->machspec->l3_shift)) & (machdep->machspec->ptrs_per_l3 - 1))
+
+#define PMD_OFFSET_L4(vaddr) \
+ ((vaddr >> (machdep->machspec->l2_shift)) & (machdep->machspec->ptrs_per_l2 - 1))
#define _PAGE_PRESENT 0x001UL /* software: pte contains a translation */
#define _PAGE_USER 0x002UL /* matches one of the PP bits */
@@ -3308,6 +3299,23 @@ struct machine_specific {
uint hwstacksize;
char *level4;
ulong last_level4_read;
+
+ uint l4_index_size;
+ uint l3_index_size;
+ uint l2_index_size;
+ uint l1_index_size;
+
+ uint ptrs_per_l3;
+ uint ptrs_per_l2;
+ uint ptrs_per_l1;
+
+ uint l4_shift;
+ uint l3_shift;
+ uint l2_shift;
+ uint l1_shift;
+
+ uint pte_shift;
+ uint l2_masked_bits;
};
#define IS_LAST_L4_READ(l4) ((ulong)(l4) == machdep->machspec->last_level4_read)
--- crash/ppc64.c 2005-11-17 10:45:16.000000000 -0800
+++ new/ppc64.c 2005-11-17 11:21:54.000000000 -0800
@@ -122,18 +122,45 @@ ppc64_init(int when)
machdep->flags |= VM_ORIG;
}
}
- switch (machdep->flags & (VM_ORIG|VM_4_LEVEL))
- {
- case VM_ORIG:
- /* pre-2.6.14 layout */
- free(machdep->machspec->level4);
- machdep->machspec->level4 = NULL;
- machdep->ptrs_per_pgd = PTRS_PER_PGD;
- break;
- case VM_4_LEVEL:
- /* 2.6.14 layout */
- machdep->ptrs_per_pgd = PTRS_PER_PGD_L4;
- break;
+ if (machdep->flags & VM_ORIG) {
+ /* pre-2.6.14 layout */
+ free(machdep->machspec->level4);
+ machdep->machspec->level4 = NULL;
+ machdep->ptrs_per_pgd = PTRS_PER_PGD;
+ } else {
+ /* 2.6.14 layout */
+ struct machine_specific *m = machdep->machspec;
+ if (machdep->pagesize == 65536) {
+ /* 64K pagesize */
+ m->l1_index_size = 12;
+ m->l2_index_size = 12;
+ m->l3_index_size = 0;
+ m->l4_index_size = 4;
+ m->l1_shift = 16;
+ m->pte_shift = 32;
+ m->l2_masked_bits = 0x1ff;
+ } else {
+ /* 4K pagesize */
+ m->l1_index_size = 9;
+ m->l2_index_size = 7;
+ m->l3_index_size = 7;
+ m->l4_index_size = 9;
+ m->l1_shift = 12;
+ m->pte_shift = 17;
+ m->l2_masked_bits = 0;
+ }
+
+ /* Compute ptrs per each level */
+ m->ptrs_per_l1 = (1 << m->l1_index_size);
+ m->ptrs_per_l2 = (1 << m->l2_index_size);
+ m->ptrs_per_l3 = (1 << m->l3_index_size);
+
+ machdep->ptrs_per_pgd = m->ptrs_per_l3;
+
+ /* Compute shifts */
+ m->l2_shift = m->l1_shift + m->l1_index_size;
+ m->l3_shift = m->l2_shift + m->l2_index_size;
+ m->l4_shift = m->l3_shift + m->l3_index_size;
}
machdep->vmalloc_start = ppc64_vmalloc_start;
MEMBER_OFFSET_INIT(thread_struct_pg_tables,
@@ -413,15 +440,19 @@ ppc64_vtop_level4(ulong vaddr, ulong *le
if (!level4_pte)
return FALSE;
- page_dir = (ulong *)((ulong *)level4_pte + PGD_OFFSET_L4(vaddr));
- FILL_PGD(PAGEBASE(level4_pte), KVADDR, PAGESIZE());
- pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(page_dir));
-
- if (verbose)
- fprintf(fp, " PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
-
- if (!pgd_pte)
- return FALSE;
+ /* Sometimes we don't have level3 pagetable entries */
+ if (machdep->machspec->l3_index_size != 0) {
+ page_dir = (ulong *)((ulong *)level4_pte + PGD_OFFSET_L4(vaddr));
+ FILL_PGD(PAGEBASE(level4_pte), KVADDR, PAGESIZE());
+ pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(page_dir));
+
+ if (verbose)
+ fprintf(fp, " PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
+ if (!pgd_pte)
+ return FALSE;
+ } else {
+ pgd_pte = level4_pte;
+ }
page_middle = (ulong *)((ulong *)pgd_pte + PMD_OFFSET_L4(vaddr));
FILL_PMD(PAGEBASE(pgd_pte), KVADDR, PAGESIZE());
@@ -433,7 +464,8 @@ ppc64_vtop_level4(ulong vaddr, ulong *le
if (!(pmd_pte))
return FALSE;
- page_table = (ulong *)pmd_pte + (BTOP(vaddr) & (PTRS_PER_PTE_L4 - 1));
+ page_table = (ulong *)(pmd_pte & ~(machdep->machspec->l2_masked_bits))
+ + (BTOP(vaddr) & (machdep->machspec->ptrs_per_l1 - 1));
if (verbose)
fprintf(fp, " PMD: %lx => %lx\n",(ulong)page_middle,
(ulong)page_table);
@@ -447,7 +479,7 @@ ppc64_vtop_level4(ulong vaddr, ulong *le
if (!(pte & _PAGE_PRESENT)) {
if (pte && verbose) {
fprintf(fp, "\n");
- ppc64_translate_pte(pte, 0, PTE_SHIFT_L4);
+ ppc64_translate_pte(pte, 0, machdep->machspec->pte_shift);
}
return FALSE;
}
@@ -455,11 +487,12 @@ ppc64_vtop_level4(ulong vaddr, ulong *le
if (!pte)
return FALSE;
- *paddr = PAGEBASE(PTOB(pte >> PTE_SHIFT_L4)) + PAGEOFFSET(vaddr);
+ *paddr = PAGEBASE(PTOB(pte >> machdep->machspec->pte_shift))
+ + PAGEOFFSET(vaddr);
if (verbose) {
fprintf(fp, " PAGE: %lx\n\n", PAGEBASE(*paddr));
- ppc64_translate_pte(pte, 0, PTE_SHIFT_L4);
+ ppc64_translate_pte(pte, 0, machdep->machspec->pte_shift);
}
return TRUE;
