[MIPS] FLATMEM: introduce PHYS_OFFSET.

The old code was assuming that min_low_pfn was always 0. This
means that platforms having a big hole at their memory start
paid the price of wasting some memory for the allocation of
unused entries in mem_map[].

This patch prevents this waste.

It introduces PHYS_OFFSET define which is the start of the
physical memory and uses it wherever needed. Specially when
converting physical/virtual addresses into virtual/physical
ones.

Currently all platforms defines PHYS_OFFSET to 0.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 23 insertions, 6 deletions

diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h
index d77b657c09c7..67f081078904 100644
--- a/include/asm-mips/io.h
+++ b/include/asm-mips/io.h
@@ -115,7 +115,7 @@ static inline void set_io_port_base(unsigned long base)
  */
 static inline unsigned long virt_to_phys(volatile const void *address)
 {
-        return (unsigned long)address - PAGE_OFFSET;
+        return (unsigned long)address - PAGE_OFFSET + PHYS_OFFSET;
 }
 
 /*
@@ -132,7 +132,7 @@ static inline unsigned long virt_to_phys(volatile const void *address)
  */
 static inline void * phys_to_virt(unsigned long address)
 {
-        return (void *)(address + PAGE_OFFSET);
+        return (void *)(address + PAGE_OFFSET - PHYS_OFFSET);
 }
 
 /*
diff --git a/include/asm-mips/page.h b/include/asm-mips/page.h
index 2f9e1a9ec51f..d3fbd83ff545 100644
--- a/include/asm-mips/page.h
+++ b/include/asm-mips/page.h
@@ -34,6 +34,20 @@
 
 #ifndef __ASSEMBLY__
 
+/*
+ * This gives the physical RAM offset.
+ */
+#ifndef PHYS_OFFSET
+#define PHYS_OFFSET             0UL
+#endif
+
+/*
+ * It's normally defined only for FLATMEM config but it's
+ * used in our early mem init code for all memory models.
+ * So always define it.
+ */
+#define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
+
 #include <linux/pfn.h>
 #include <asm/io.h>
 
@@ -132,20 +146,23 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 /* to align the pointer to the (next) page boundary */
 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
 
+/*
+ * __pa()/__va() should be used only during mem init.
+ */
 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
 #define __pa_page_offset(x)     ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0)
 #else
 #define __pa_page_offset(x)     PAGE_OFFSET
 #endif
-#define __pa(x)                 ((unsigned long)(x) - __pa_page_offset(x))
-#define __pa_symbol(x)          __pa(RELOC_HIDE((unsigned long)(x),0))
-#define __va(x)                 ((void *)((unsigned long)(x) + PAGE_OFFSET))
+#define __pa(x)         ((unsigned long)(x) - __pa_page_offset(x) + PHYS_OFFSET)
+#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
+#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x),0))
 
 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 
 #ifdef CONFIG_FLATMEM
 
-#define pfn_valid(pfn)          ((pfn) < max_mapnr)
+#define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
 
 #elif defined(CONFIG_SPARSEMEM)