[Crash-utility] [PATH v4 2/2] arm64: add 4-level translation
AKASHI Takahiro
takahiro.akashi at linaro.org
Mon May 30 06:46:08 UTC 2016
From: AKASHI Takahiro <akax.hiro at gmail.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
arm64.c | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
defs.h | 25 +++++++++++++-
2 files changed, 137 insertions(+), 8 deletions(-)
diff --git a/arm64.c b/arm64.c
index c16ea67..b6bfbf3 100644
--- a/arm64.c
+++ b/arm64.c
@@ -36,6 +36,7 @@ static int arm64_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int arm64_vtop_2level_64k(ulong, ulong, physaddr_t *, int);
static int arm64_vtop_3level_64k(ulong, ulong, physaddr_t *, int);
static int arm64_vtop_3level_4k(ulong, ulong, physaddr_t *, int);
+static int arm64_vtop_4level_4k(ulong, ulong, physaddr_t *, int);
static ulong arm64_get_task_pgd(ulong);
static void arm64_irq_stack_init(void);
static void arm64_stackframe_init(void);
@@ -233,18 +234,26 @@ arm64_init(int when)
switch (machdep->pagesize)
{
case 4096:
- machdep->flags |= VM_L3_4K;
machdep->ptrs_per_pgd = PTRS_PER_PGD_L3_4K;
if ((machdep->pgd =
(char *)malloc(PTRS_PER_PGD_L3_4K * 8)) == NULL)
error(FATAL, "cannot malloc pgd space.");
+ if (machdep->machspec->VA_BITS > PGDIR_SHIFT_L4_4K) {
+ machdep->flags |= VM_L4_4K;
+ if ((machdep->pud =
+ (char *)malloc(PTRS_PER_PUD_L4_4K * 8))
+ == NULL)
+ error(FATAL, "cannot malloc pud space.");
+ } else {
+ machdep->flags |= VM_L3_4K;
+ machdep->pud = NULL; /* not used */
+ }
if ((machdep->pmd =
(char *)malloc(PTRS_PER_PMD_L3_4K * 8)) == NULL)
error(FATAL, "cannot malloc pmd space.");
if ((machdep->ptbl =
(char *)malloc(PTRS_PER_PTE_L3_4K * 8)) == NULL)
error(FATAL, "cannot malloc ptbl space.");
- machdep->pud = NULL; /* not used */
break;
case 65536:
@@ -282,8 +291,8 @@ arm64_init(int when)
error(FATAL, "cannot determine page size\n");
}
- machdep->last_pud_read = 0; /* not used */
machdep->last_pgd_read = 0;
+ machdep->last_pud_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
machdep->clear_machdep_cache = arm64_clear_machdep_cache;
@@ -462,6 +471,8 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, "%sVM_L3_64K", others++ ? "|" : "");
if (machdep->flags & VM_L3_4K)
fprintf(fp, "%sVM_L3_4K", others++ ? "|" : "");
+ if (machdep->flags & VM_L4_4K)
+ fprintf(fp, "%sVM_L4_4K", others++ ? "|" : "");
if (machdep->flags & VMEMMAP)
fprintf(fp, "%sVMEMMAP", others++ ? "|" : "");
if (machdep->flags & KDUMP_ENABLED)
@@ -494,11 +505,15 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, " uvtop: arm64_uvtop()->%s()\n",
machdep->flags & VM_L3_4K ?
"arm64_vtop_3level_4k" :
+ machdep->flags & VM_L4_4K ?
+ "arm64_vtop_4level_4k" :
machdep->flags & VM_L3_64K ?
"arm64_vtop_3level_64k" : "arm64_vtop_2level_64k");
fprintf(fp, " kvtop: arm64_kvtop()->%s()\n",
machdep->flags & VM_L3_4K ?
"arm64_vtop_3level_4k" :
+ machdep->flags & VM_L4_4K ?
+ "arm64_vtop_4level_4k" :
machdep->flags & VM_L3_64K ?
"arm64_vtop_3level_64k" : "arm64_vtop_2level_64k");
fprintf(fp, " get_task_pgd: arm64_get_task_pgd()\n");
@@ -531,8 +546,13 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, " xendump_panic_task: (n/a)\n");
fprintf(fp, " get_xendump_regs: (n/a)\n");
fprintf(fp, " line_number_hooks: (not used)\n");
- fprintf(fp, " last_pud_read: (not used)\n");
fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read);
+ fprintf(fp, " last_pud_read: ");
+ if ((PAGESIZE() == 65536) ||
+ ((PAGESIZE() == 4096) && !(machdep->flags & VM_L4_4K)))
+ fprintf(fp, "(not used)\n");
+ else
+ fprintf(fp, "%lx\n", machdep->last_pud_read);
fprintf(fp, " last_pmd_read: ");
if (PAGESIZE() == 65536)
fprintf(fp, "(not used)\n");
@@ -541,6 +561,7 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, " last_ptbl_read: %lx\n", machdep->last_ptbl_read);
fprintf(fp, " clear_machdep_cache: arm64_clear_machdep_cache()\n");
fprintf(fp, " pgd: %lx\n", (ulong)machdep->pgd);
+ fprintf(fp, " pud: %lx\n", (ulong)machdep->pud);
fprintf(fp, " pmd: %lx\n", (ulong)machdep->pmd);
fprintf(fp, " ptbl: %lx\n", (ulong)machdep->ptbl);
fprintf(fp, " ptrs_per_pgd: %d\n", machdep->ptrs_per_pgd);
@@ -843,7 +864,7 @@ arm64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbos
kernel_pgd = vt->kernel_pgd[0];
*paddr = 0;
- switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K))
+ switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K))
{
case VM_L2_64K:
return arm64_vtop_2level_64k(kernel_pgd, kvaddr, paddr, verbose);
@@ -851,6 +872,8 @@ arm64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbos
return arm64_vtop_3level_64k(kernel_pgd, kvaddr, paddr, verbose);
case VM_L3_4K:
return arm64_vtop_3level_4k(kernel_pgd, kvaddr, paddr, verbose);
+ case VM_L4_4K:
+ return arm64_vtop_4level_4k(kernel_pgd, kvaddr, paddr, verbose);
default:
return FALSE;
}
@@ -866,7 +889,7 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbos
*paddr = 0;
- switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K))
+ switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K))
{
case VM_L2_64K:
return arm64_vtop_2level_64k(user_pgd, uvaddr, paddr, verbose);
@@ -874,6 +897,8 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbos
return arm64_vtop_3level_64k(user_pgd, uvaddr, paddr, verbose);
case VM_L3_4K:
return arm64_vtop_3level_4k(user_pgd, uvaddr, paddr, verbose);
+ case VM_L4_4K:
+ return arm64_vtop_4level_4k(user_pgd, uvaddr, paddr, verbose);
default:
return FALSE;
}
@@ -1092,6 +1117,85 @@ no_page:
return FALSE;
}
+static int
+arm64_vtop_4level_4k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose)
+{
+ ulong *pgd_base, *pgd_ptr, pgd_val;
+ ulong *pud_base, *pud_ptr, pud_val;
+ ulong *pmd_base, *pmd_ptr, pmd_val;
+ ulong *pte_base, *pte_ptr, pte_val;
+
+ if (verbose)
+ fprintf(fp, "PAGE DIRECTORY: %lx\n", pgd);
+
+ pgd_base = (ulong *)pgd;
+ FILL_PGD(pgd_base, KVADDR, PTRS_PER_PGD_L4_4K * sizeof(ulong));
+ pgd_ptr = pgd_base + (((vaddr) >> PGDIR_SHIFT_L4_4K) & (PTRS_PER_PGD_L4_4K - 1));
+ pgd_val = ULONG(machdep->pgd + PGDIR_OFFSET(pgd_ptr));
+ if (verbose)
+ fprintf(fp, " PGD: %lx => %lx\n", (ulong)pgd_ptr, pgd_val);
+ if (!pgd_val)
+ goto no_page;
+
+ pud_base = (ulong *)PTOV(pgd_val & PHYS_MASK & PGDIR_MASK);
+
+ FILL_PUD(pud_base, KVADDR, PTRS_PER_PUD_L4_4K * sizeof(ulong));
+ pud_ptr = pud_base + (((vaddr) >> PUD_SHIFT_L4_4K) & (PTRS_PER_PUD_L4_4K - 1));
+ pud_val = ULONG(machdep->pud + PAGEOFFSET(pud_ptr));
+ if (verbose)
+ fprintf(fp, " PUD: %lx => %lx\n", (ulong)pud_ptr, pud_val);
+ if (!pud_val)
+ goto no_page;
+
+ pmd_base = (ulong *)PTOV(pud_val & PHYS_MASK & (s32)machdep->pagemask);
+ FILL_PMD(pmd_base, KVADDR, PTRS_PER_PMD_L4_4K * sizeof(ulong));
+ pmd_ptr = pmd_base + (((vaddr) >> PMD_SHIFT_L4_4K) & (PTRS_PER_PMD_L4_4K - 1));
+ pmd_val = ULONG(machdep->pmd + PAGEOFFSET(pmd_ptr));
+ if (verbose)
+ fprintf(fp, " PMD: %lx => %lx\n", (ulong)pmd_ptr, pmd_val);
+ if (!pmd_val)
+ goto no_page;
+
+ if ((pmd_val & PMD_TYPE_MASK) == PMD_TYPE_SECT) {
+ ulong sectionbase = (pmd_val & SECTION_PAGE_MASK_2MB) & PHYS_MASK;
+ if (verbose) {
+ fprintf(fp, " PAGE: %lx (2MB)\n\n", sectionbase);
+ arm64_translate_pte(pmd_val, 0, 0);
+ }
+ *paddr = sectionbase + (vaddr & ~SECTION_PAGE_MASK_2MB);
+ return TRUE;
+ }
+
+ pte_base = (ulong *)PTOV(pmd_val & PHYS_MASK & (s32)machdep->pagemask);
+ FILL_PTBL(pte_base, KVADDR, PTRS_PER_PTE_L4_4K * sizeof(ulong));
+ pte_ptr = pte_base + (((vaddr) >> machdep->pageshift) & (PTRS_PER_PTE_L4_4K - 1));
+ pte_val = ULONG(machdep->ptbl + PAGEOFFSET(pte_ptr));
+ if (verbose)
+ fprintf(fp, " PTE: %lx => %lx\n", (ulong)pte_ptr, pte_val);
+ if (!pte_val)
+ goto no_page;
+
+ if (pte_val & PTE_VALID) {
+ *paddr = (PAGEBASE(pte_val) & PHYS_MASK) + PAGEOFFSET(vaddr);
+ if (verbose) {
+ fprintf(fp, " PAGE: %lx\n\n", PAGEBASE(*paddr));
+ arm64_translate_pte(pte_val, 0, 0);
+ }
+ } else {
+ if (IS_UVADDR(vaddr, NULL))
+ *paddr = pte_val;
+ if (verbose) {
+ fprintf(fp, "\n");
+ arm64_translate_pte(pte_val, 0, 0);
+ }
+ goto no_page;
+ }
+
+ return TRUE;
+no_page:
+ return FALSE;
+}
+
static ulong
arm64_get_task_pgd(ulong task)
{
@@ -2556,7 +2660,7 @@ arm64_calc_virtual_memory_ranges(void)
STRUCT_SIZE_INIT(page, "page");
- switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K))
+ switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K))
{
case VM_L2_64K:
case VM_L3_64K:
@@ -2564,6 +2668,8 @@ arm64_calc_virtual_memory_ranges(void)
break;
case VM_L3_4K:
PUD_SIZE = PGDIR_SIZE_L3_4K;
+ case VM_L4_4K:
+ PUD_SIZE = PUD_SIZE_L4_4K;
break;
}
diff --git a/defs.h b/defs.h
index 406a865..17a4fbd 100644
--- a/defs.h
+++ b/defs.h
@@ -1054,7 +1054,7 @@ extern struct machdep_table *machdep;
readmem((ulonglong)((ulong)(PGD)), TYPE, machdep->pgd, \
SIZE, "pgd page", FAULT_ON_ERROR); \
machdep->last_pgd_read = (ulong)(PGD); \
- }
+ }
#define FILL_PUD(PUD, TYPE, SIZE) \
if (!IS_LAST_PUD_READ(PUD)) { \
@@ -2884,6 +2884,28 @@ typedef signed int s32;
#define PMD_MASK_L3_4K (~(PMD_SIZE_L3_4K-1))
/*
+ * 4-levels / 4K pages
+ * 48-bit VA
+ */
+#define PTRS_PER_PGD_L4_4K ((1UL) << (48 - 39))
+#define PTRS_PER_PUD_L4_4K (512)
+#define PTRS_PER_PMD_L4_4K (512)
+#define PTRS_PER_PTE_L4_4K (512)
+#define PGDIR_SHIFT_L4_4K (39)
+#define PGDIR_SIZE_L4_4K ((1UL) << PGDIR_SHIFT_L4_4K)
+#define PGDIR_MASK_L4_4K (~(PGDIR_SIZE_L4_4K-1))
+#define PUD_SHIFT_L4_4K (30)
+#define PUD_SIZE_L4_4K ((1UL) << PUD_SHIFT_L4_4K)
+#define PUD_MASK_L4_4K (~(PUD_SIZE_L4_4K-1))
+#define PMD_SHIFT_L4_4K (21)
+#define PMD_SIZE_L4_4K (1UL << PMD_SHIFT_L4_4K)
+#define PMD_MASK_L4_4K (~(PMD_SIZE_L4_4K-1))
+
+#define PGDIR_SIZE (1UL << ((48 - 39) + 3))
+#define PGDIR_MASK (~(PGDIR_SIZE - 1))
+#define PGDIR_OFFSET(X) (((ulong)(X)) & (PGDIR_SIZE - 1))
+
+/*
* 3-levels / 64K pages
*/
#define PTRS_PER_PGD_L3_64K (64)
@@ -2941,6 +2963,7 @@ typedef signed int s32;
#define KDUMP_ENABLED (0x20)
#define IRQ_STACKS (0x40)
#define NEW_VMEMMAP (0x80)
+#define VM_L4_4K (0x100)
/*
* sources: Documentation/arm64/memory.txt
--
2.8.1
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