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authorCatalin Marinas <catalin.marinas@arm.com>2014-07-16 17:42:43 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2014-07-23 15:28:05 +0100
commit08375198b01001c0e43bdd580104b16b019a3754 (patch)
tree42fcb4cd3d1660d4fcdc2c44a6ce8d5982e220e8 /arch/arm64/include
parentb4a0d8b37797663b0e523c102dbb3e4b712a720c (diff)
arm64: Determine the vmalloc/vmemmap space at build time based on VA_BITS
Rather than guessing what the maximum vmmemap space should be, this patch allows the calculation based on the VA_BITS and sizeof(struct page). The vmalloc space extends to the beginning of the vmemmap space. Since the virtual kernel memory layout now depends on the build configuration, this patch removes the detailed description in Documentation/arm64/memory.txt in favour of information printed during kernel booting. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Jungseok Lee <jungseoklee85@gmail.com>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r--arch/arm64/include/asm/pgtable.h13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 9f862e6e9286..ec82789d03c3 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -33,13 +33,16 @@
/*
* VMALLOC and SPARSEMEM_VMEMMAP ranges.
+ *
+ * VMEMAP_SIZE: allows the whole VA space to be covered by a struct page array
+ * (rounded up to PUD_SIZE).
+ * VMALLOC_START: beginning of the kernel VA space
+ * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space,
+ * fixed mappings and modules
*/
+#define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE)
#define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS)
-#if CONFIG_ARM64_PGTABLE_LEVELS != 4
-#define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
-#else
-#define VMALLOC_END (PAGE_OFFSET - UL(0x40000000000) - SZ_64K)
-#endif
+#define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
#define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))