Patchwork [V5,3/7] arm64: mm: Define arch_get_mmap_end, arch_get_mmap_base

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Submitter Steve Capper
Date Dec. 6, 2018, 10:50 p.m.
Message ID <20181206225042.11548-4-steve.capper@arm.com>
Download mbox | patch
Permalink /patch/674791/
State New
Headers show

Comments

Steve Capper - Dec. 6, 2018, 10:50 p.m.
Now that we have DEFAULT_MAP_WINDOW defined, we can arch_get_mmap_end
and arch_get_mmap_base helpers to allow for high addresses in mmap.

Signed-off-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/processor.h | 7 +++++++
 1 file changed, 7 insertions(+)

Patch

diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index 50586ca6bacb..fe95fd8b065e 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -72,6 +72,13 @@ 
 #define STACK_TOP		STACK_TOP_MAX
 #endif /* CONFIG_COMPAT */
 
+#define arch_get_mmap_end(addr) ((addr > DEFAULT_MAP_WINDOW) ? TASK_SIZE :\
+				DEFAULT_MAP_WINDOW)
+
+#define arch_get_mmap_base(addr, base) ((addr > DEFAULT_MAP_WINDOW) ? \
+					base + TASK_SIZE - DEFAULT_MAP_WINDOW :\
+					base)
+
 extern phys_addr_t arm64_dma_phys_limit;
 #define ARCH_LOW_ADDRESS_LIMIT	(arm64_dma_phys_limit - 1)