msm: 8974: Enable DONT_MAP_HOLE_AFTER_MEMBANK0
If this config option is enabled, the kernel does not map the
memory corresponding to the largest hole into the virtual
memory resulting in more lowmem. If multiple holes exist, the
largest hole in the first 256MB of the memory is not mapped.
In device tree based targets the kernel is no longer dependant
on the bootloader for the start and size of the memory holes.
Thus the meminfo is adjusted to reflect the memory hole, if it
is present, using the start and end of the memory hole, while
parsing the device tree.
For non-device tree based targets, the meminfo is used to find
the start and size of the memory hole. No adjustment is needed
to be made to the meminfo, as the hole is taken into account,
based on the memory information passed by the atags.
Change-Id: Ib2619f72ac2b4142330534c8bbe1c7d9f64ea38c
Signed-off-by: Neeti Desai <neetid@codeaurora.org>
diff --git a/arch/arm/mach-msm/include/mach/memory.h b/arch/arm/mach-msm/include/mach/memory.h
index acfbe4a..d089924 100644
--- a/arch/arm/mach-msm/include/mach/memory.h
+++ b/arch/arm/mach-msm/include/mach/memory.h
@@ -98,26 +98,25 @@
#define finish_arch_switch(prev) do { store_ttbr0(); } while (0)
#endif
+#define MAX_HOLE_ADDRESS (PHYS_OFFSET + 0x10000000)
+extern unsigned long memory_hole_offset;
+extern unsigned long memory_hole_start;
+extern unsigned long memory_hole_end;
#ifdef CONFIG_DONT_MAP_HOLE_AFTER_MEMBANK0
-extern unsigned long membank0_size;
-extern unsigned long membank1_start;
-void find_membank0_hole(void);
+void find_memory_hole(void);
-#define MEMBANK0_PHYS_OFFSET PHYS_OFFSET
-#define MEMBANK0_PAGE_OFFSET PAGE_OFFSET
-
-#define MEMBANK1_PHYS_OFFSET (membank1_start)
-#define MEMBANK1_PAGE_OFFSET (MEMBANK0_PAGE_OFFSET + (membank0_size))
+#define MEM_HOLE_END_PHYS_OFFSET (memory_hole_end)
+#define MEM_HOLE_PAGE_OFFSET (PAGE_OFFSET + memory_hole_offset)
#define __phys_to_virt(phys) \
- ((MEMBANK1_PHYS_OFFSET && ((phys) >= MEMBANK1_PHYS_OFFSET)) ? \
- (phys) - MEMBANK1_PHYS_OFFSET + MEMBANK1_PAGE_OFFSET : \
- (phys) - MEMBANK0_PHYS_OFFSET + MEMBANK0_PAGE_OFFSET)
+ ((MEM_HOLE_END_PHYS_OFFSET && ((phys) >= MEM_HOLE_END_PHYS_OFFSET)) ? \
+ (phys) - MEM_HOLE_END_PHYS_OFFSET + MEM_HOLE_PAGE_OFFSET : \
+ (phys) - PHYS_OFFSET + PAGE_OFFSET)
#define __virt_to_phys(virt) \
- ((MEMBANK1_PHYS_OFFSET && ((virt) >= MEMBANK1_PAGE_OFFSET)) ? \
- (virt) - MEMBANK1_PAGE_OFFSET + MEMBANK1_PHYS_OFFSET : \
- (virt) - MEMBANK0_PAGE_OFFSET + MEMBANK0_PHYS_OFFSET)
+ ((MEM_HOLE_END_PHYS_OFFSET && ((virt) >= MEM_HOLE_PAGE_OFFSET)) ? \
+ (virt) - MEM_HOLE_PAGE_OFFSET + MEM_HOLE_END_PHYS_OFFSET : \
+ (virt) - PAGE_OFFSET + PHYS_OFFSET)
#endif
/*