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authorCatalin Marinas <catalin.marinas@arm.com>2014-07-16 12:10:33 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2014-07-23 15:28:01 +0100
commitb4a0d8b37797663b0e523c102dbb3e4b712a720c (patch)
treef0b86308ffc3202889c4286adea1cce4f6f6d4e6 /arch/arm64
parent0f1740252bea82c972e432f4d0fb76e974d53bd3 (diff)
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arm64: Clean up the initial page table creation in head.S
This patch adds a create_table_entry macro which is used to populate pgd and pud entries, also reducing the number of arguments for create_pgd_entry. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Jungseok Lee <jungseoklee85@gmail.com>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/kernel/head.S59
1 files changed, 27 insertions, 32 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 019f81d9f1d5..a6db505411bc 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -476,43 +476,38 @@ ENDPROC(__calc_phys_offset)
.quad PAGE_OFFSET
/*
- * Macro to populate the PUD for the corresponding block entry in the next
- * level (tbl) for the given virtual address in case of 4 levels.
+ * Macro to create a table entry to the next page.
*
- * Preserves: pgd, virt
- * Corrupts: tbl, tmp1, tmp2
- * Returns: pud
+ * tbl: page table address
+ * virt: virtual address
+ * shift: #imm page table shift
+ * ptrs: #imm pointers per table page
+ *
+ * Preserves: virt
+ * Corrupts: tmp1, tmp2
+ * Returns: tbl -> next level table page address
*/
- .macro create_pud_entry, pgd, tbl, virt, pud, tmp1, tmp2
-#if CONFIG_ARM64_PGTABLE_LEVELS == 4
- add \tbl, \tbl, #PAGE_SIZE // bump tbl 1 page up.
- // to make room for pud
- add \pud, \pgd, #PAGE_SIZE // pgd points to pud which
- // follows pgd
- lsr \tmp1, \virt, #PUD_SHIFT
- and \tmp1, \tmp1, #PTRS_PER_PUD - 1 // PUD index
- orr \tmp2, \tbl, #3 // PUD entry table type
- str \tmp2, [\pud, \tmp1, lsl #3]
-#else
- mov \pud, \tbl
-#endif
+ .macro create_table_entry, tbl, virt, shift, ptrs, tmp1, tmp2
+ lsr \tmp1, \virt, #\shift
+ and \tmp1, \tmp1, #\ptrs - 1 // table index
+ add \tmp2, \tbl, #PAGE_SIZE
+ orr \tmp2, \tmp2, #PMD_TYPE_TABLE // address of next table and entry type
+ str \tmp2, [\tbl, \tmp1, lsl #3]
+ add \tbl, \tbl, #PAGE_SIZE // next level table page
.endm
/*
* Macro to populate the PGD (and possibily PUD) for the corresponding
* block entry in the next level (tbl) for the given virtual address.
*
- * Preserves: pgd, virt
- * Corrupts: tmp1, tmp2, tmp3
- * Returns: tbl -> page where block mappings can be placed
- * (changed to make room for pud with 4 levels, preserved otherwise)
+ * Preserves: tbl, next, virt
+ * Corrupts: tmp1, tmp2
*/
- .macro create_pgd_entry, pgd, tbl, virt, tmp1, tmp2, tmp3
- create_pud_entry \pgd, \tbl, \virt, \tmp3, \tmp1, \tmp2
- lsr \tmp1, \virt, #PGDIR_SHIFT
- and \tmp1, \tmp1, #PTRS_PER_PGD - 1 // PGD index
- orr \tmp2, \tmp3, #3 // PGD entry table type
- str \tmp2, [\pgd, \tmp1, lsl #3]
+ .macro create_pgd_entry, tbl, virt, tmp1, tmp2
+ create_table_entry \tbl, \virt, PGDIR_SHIFT, PTRS_PER_PGD, \tmp1, \tmp2
+#if CONFIG_ARM64_PGTABLE_LEVELS == 4
+ create_table_entry \tbl, \virt, PUD_SHIFT, PTRS_PER_PUD, \tmp1, \tmp2
+#endif
.endm
/*
@@ -573,10 +568,10 @@ __create_page_tables:
/*
* Create the identity mapping.
*/
- add x0, x25, #PAGE_SIZE // section table address
+ mov x0, x25 // idmap_pg_dir
ldr x3, =KERNEL_START
add x3, x3, x28 // __pa(KERNEL_START)
- create_pgd_entry x25, x0, x3, x1, x5, x6
+ create_pgd_entry x0, x3, x5, x6
ldr x6, =KERNEL_END
mov x5, x3 // __pa(KERNEL_START)
add x6, x6, x28 // __pa(KERNEL_END)
@@ -585,9 +580,9 @@ __create_page_tables:
/*
* Map the kernel image (starting with PHYS_OFFSET).
*/
- add x0, x26, #PAGE_SIZE // section table address
+ mov x0, x26 // swapper_pg_dir
mov x5, #PAGE_OFFSET
- create_pgd_entry x26, x0, x5, x1, x3, x6
+ create_pgd_entry x0, x5, x3, x6
ldr x6, =KERNEL_END
mov x3, x24 // phys offset
create_block_map x0, x7, x3, x5, x6