[PATCH] arm64: Introduction of support for 16K page with 3-level table support
by Kuan-Ying Lee
Introduction of ARM64 support for 16K page size with 3-level page
table and 47 VA bits.
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee(a)canonical.com>
---
arm64.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
defs.h | 16 ++++++++
2 files changed, 126 insertions(+), 4 deletions(-)
diff --git a/arm64.c b/arm64.c
index b3040d757946..5356ae1f5cce 100644
--- a/arm64.c
+++ b/arm64.c
@@ -42,6 +42,7 @@ static int arm64_kvtop(struct task_context *, ulong, physaddr_t *, int);
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_16k(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);
@@ -261,8 +262,7 @@ arm64_init(int when)
machdep->pagesize = 4096;
break;
case 2:
- /* TODO: machdep->pagesize = 16384; */
- error(FATAL, "16K pages not supported.");
+ machdep->pagesize = 16384;
break;
case 3:
machdep->pagesize = 65536;
@@ -392,6 +392,26 @@ arm64_init(int when)
error(FATAL, "cannot malloc ptbl space.");
break;
+ case 16384:
+ if (machdep->machspec->VA_BITS > PGDIR_SHIFT_L3_16K) {
+ machdep->flags |= VM_L3_16K;
+ if (!machdep->ptrs_per_pgd)
+ machdep->ptrs_per_pgd = PTRS_PER_PGD_L3_16K;
+ if ((machdep->pgd =
+ (char *)malloc(machdep->ptrs_per_pgd * 8)) == NULL)
+ error(FATAL, "cannot malloc pgd space.");
+ if ((machdep->pmd =
+ (char *)malloc(PTRS_PER_PMD_L3_16K * 8)) == NULL)
+ error(FATAL, "cannot malloc pmd space.");
+ if ((machdep->ptbl =
+ (char *)malloc(PTRS_PER_PTE_L3_16K * 8)) == NULL)
+ error(FATAL, "cannot malloc ptbl space.");
+ } else {
+ error(FATAL, "we only support 47 bits, 3 level for 16K page now.");
+ }
+ machdep->pud = NULL; /* not used */
+ break;
+
case 65536:
if (kernel_symbol_exists("idmap_ptrs_per_pgd") &&
readmem(symbol_value("idmap_ptrs_per_pgd"), KVADDR,
@@ -1018,6 +1038,8 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, "%sVM_L2_64K", others++ ? "|" : "");
if (machdep->flags & VM_L3_64K)
fprintf(fp, "%sVM_L3_64K", others++ ? "|" : "");
+ if (machdep->flags & VM_L3_16K)
+ fprintf(fp, "%sVM_L3_16K", others++ ? "|" : "");
if (machdep->flags & VM_L3_4K)
fprintf(fp, "%sVM_L3_4K", others++ ? "|" : "");
if (machdep->flags & VM_L4_4K)
@@ -1065,6 +1087,8 @@ arm64_dump_machdep_table(ulong arg)
"arm64_vtop_3level_4k" :
machdep->flags & VM_L4_4K ?
"arm64_vtop_4level_4k" :
+ machdep->flags & VM_L3_16K ?
+ "arm64_vtop_3level_16k" :
machdep->flags & VM_L3_64K ?
"arm64_vtop_3level_64k" : "arm64_vtop_2level_64k");
fprintf(fp, " kvtop: arm64_kvtop()->%s()\n",
@@ -1072,6 +1096,8 @@ arm64_dump_machdep_table(ulong arg)
"arm64_vtop_3level_4k" :
machdep->flags & VM_L4_4K ?
"arm64_vtop_4level_4k" :
+ machdep->flags & VM_L3_16K ?
+ "arm64_vtop_3level_16k" :
machdep->flags & VM_L3_64K ?
"arm64_vtop_3level_64k" : "arm64_vtop_2level_64k");
fprintf(fp, " get_task_pgd: arm64_get_task_pgd()\n");
@@ -1107,6 +1133,7 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read);
fprintf(fp, " last_pud_read: ");
if ((PAGESIZE() == 65536) ||
+ (PAGESIZE() == 16384) ||
((PAGESIZE() == 4096) && !(machdep->flags & VM_L4_4K)))
fprintf(fp, "(not used)\n");
else
@@ -1761,7 +1788,7 @@ 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|VM_L4_4K))
+ switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K|VM_L3_16K))
{
case VM_L2_64K:
return arm64_vtop_2level_64k(kernel_pgd, kvaddr, paddr, verbose);
@@ -1771,6 +1798,8 @@ arm64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbos
return arm64_vtop_3level_4k(kernel_pgd, kvaddr, paddr, verbose);
case VM_L4_4K:
return arm64_vtop_4level_4k(kernel_pgd, kvaddr, paddr, verbose);
+ case VM_L3_16K:
+ return arm64_vtop_3level_16k(kernel_pgd, kvaddr, paddr, verbose);
default:
return FALSE;
}
@@ -1786,7 +1815,7 @@ 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|VM_L4_4K))
+ switch (machdep->flags & (VM_L2_64K|VM_L3_64K|VM_L3_4K|VM_L4_4K|VM_L3_16K))
{
case VM_L2_64K:
return arm64_vtop_2level_64k(user_pgd, uvaddr, paddr, verbose);
@@ -1796,6 +1825,8 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbos
return arm64_vtop_3level_4k(user_pgd, uvaddr, paddr, verbose);
case VM_L4_4K:
return arm64_vtop_4level_4k(user_pgd, uvaddr, paddr, verbose);
+ case VM_L3_16K:
+ return arm64_vtop_3level_16k(user_pgd, uvaddr, paddr, verbose);
default:
return FALSE;
}
@@ -1812,6 +1843,7 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbos
#define PMD_TYPE_SECT 1
#define PMD_TYPE_TABLE 2
#define SECTION_PAGE_MASK_2MB ((long)(~((MEGABYTES(2))-1)))
+#define SECTION_PAGE_MASK_32MB ((long)(~((MEGABYTES(32))-1)))
#define SECTION_PAGE_MASK_512MB ((long)(~((MEGABYTES(512))-1)))
#define SECTION_PAGE_MASK_1GB ((long)(~((GIGABYTES(1))-1)))
@@ -1954,6 +1986,80 @@ no_page:
return FALSE;
}
+static int
+arm64_vtop_3level_16k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose)
+{
+ ulong *pgd_base, *pgd_ptr, pgd_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, machdep->ptrs_per_pgd * sizeof(ulong));
+ pgd_ptr = pgd_base + (((vaddr) >> PGDIR_SHIFT_L3_16K) & (machdep->ptrs_per_pgd - 1));
+ pgd_val = ULONG(machdep->pgd + PGDIR_OFFSET_L3_16K(pgd_ptr));
+ if (verbose)
+ fprintf(fp, " PGD: %lx => %lx\n", (ulong)pgd_ptr, pgd_val);
+ if (!pgd_val)
+ goto no_page;
+
+ /*
+ * #define __PAGETABLE_PUD_FOLDED
+ */
+
+ pmd_base = (ulong *)PTOV(PTE_TO_PHYS(pgd_val));
+ FILL_PMD(pmd_base, KVADDR, PTRS_PER_PMD_L3_16K * sizeof(ulong));
+ pmd_ptr = pmd_base + (((vaddr) >> PMD_SHIFT_L3_16K) & (PTRS_PER_PMD_L3_16K - 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 = PTE_TO_PHYS(pmd_val) & SECTION_PAGE_MASK_32MB;
+ if (verbose) {
+ fprintf(fp, " PAGE: %lx (32MB%s)\n\n", sectionbase,
+ IS_ZEROPAGE(sectionbase) ? ", ZERO PAGE" : "");
+ arm64_translate_pte(pmd_val, 0, 0);
+ }
+ *paddr = sectionbase + (vaddr & ~SECTION_PAGE_MASK_32MB);
+ return TRUE;
+ }
+
+ pte_base = (ulong *)PTOV(PTE_TO_PHYS(pmd_val));
+ FILL_PTBL(pte_base, KVADDR, PTRS_PER_PTE_L3_16K * sizeof(ulong));
+ pte_ptr = pte_base + (((vaddr) >> machdep->pageshift) & (PTRS_PER_PTE_L3_16K - 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 = PTE_TO_PHYS(pte_val) + PAGEOFFSET(vaddr);
+ if (verbose) {
+ fprintf(fp, " PAGE: %lx %s\n\n", PAGEBASE(*paddr),
+ IS_ZEROPAGE(PAGEBASE(*paddr)) ? "(ZERO PAGE)" : "");
+ 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 int
arm64_vtop_3level_4k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose)
{
diff --git a/defs.h b/defs.h
index 49e6923ede54..1b7649d9f05c 100644
--- a/defs.h
+++ b/defs.h
@@ -3302,6 +3302,21 @@ typedef signed int s32;
#define PGDIR_MASK_48VA (~(PGDIR_SIZE_48VA - 1))
#define PGDIR_OFFSET_48VA(X) (((ulong)(X)) & (PGDIR_SIZE_48VA - 1))
+/*
+ * 3-levels / 16K pages
+ * 47-bit VA
+ */
+#define PTRS_PER_PGD_L3_16K ((1UL) << (47 - 36))
+#define PTRS_PER_PMD_L3_16K (2048)
+#define PTRS_PER_PTE_L3_16K (2048)
+#define PGDIR_SHIFT_L3_16K (36)
+#define PGDIR_SIZE_L3_16K ((1UL) << PGDIR_SHIFT_L3_16K)
+#define PGDIR_MASK_L3_16K (~(PGDIR_SIZE_L3_16K-1))
+#define PMD_SHIFT_L3_16K (25)
+#define PMD_SIZE_L3_16K (1UL << PMD_SHIFT_L3_16K)
+#define PMD_MASK_L3_16K (~(PMD_SIZE_L3_16K-1))
+#define PGDIR_OFFSET_L3_16K(X) (((ulong)(X)) & ((machdep->ptrs_per_pgd * 8) - 1))
+
/*
* 3-levels / 64K pages
*/
@@ -3367,6 +3382,7 @@ typedef signed int s32;
#define HAS_PHYSVIRT_OFFSET (0x800)
#define OVERFLOW_STACKS (0x1000)
#define ARM64_MTE (0x2000)
+#define VM_L3_16K (0x4000)
/*
* Get kimage_voffset from /dev/crash
--
2.34.1
3 months, 3 weeks
- 3
- 3