i2c: S3C2410: Pass the I2C bus number via drivers platform data

[safe/jmp/linux-2.6] / include / asm-powerpc / page.h

diff --git a/include/asm-powerpc/page.h b/include/asm-powerpc/page.h
index 94905ba..e088545 100644 (file)
--- a/include/asm-powerpc/page.h
+++ b/include/asm-powerpc/page.h
@@ -10,9 +10,9 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#ifdef __KERNEL__
-#include <linux/config.h>
 #include <asm/asm-compat.h>
+#include <asm/kdump.h>
+#include <asm/types.h>
 
 /*
  * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
@@ -37,27 +37,63 @@
  */
 #define PAGE_MASK      (~((1 << PAGE_SHIFT) - 1))
 
-#define PAGE_OFFSET     ASM_CONST(CONFIG_KERNEL_START)
-#define KERNELBASE      PAGE_OFFSET
+/*
+ * KERNELBASE is the virtual address of the start of the kernel, it's often
+ * the same as PAGE_OFFSET, but _might not be_.
+ *
+ * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
+ *
+ * PAGE_OFFSET is the virtual address of the start of lowmem.
+ *
+ * PHYSICAL_START is the physical address of the start of the kernel.
+ *
+ * MEMORY_START is the physical address of the start of lowmem.
+ *
+ * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
+ * ppc32 and based on how they are set we determine MEMORY_START.
+ *
+ * For the linear mapping the following equation should be true:
+ * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
+ *
+ * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
+ *
+ * There are two was to determine a physical address from a virtual one:
+ * va = pa + PAGE_OFFSET - MEMORY_START
+ * va = pa + KERNELBASE - PHYSICAL_START
+ *
+ * If you want to know something's offset from the start of the kernel you
+ * should subtract KERNELBASE.
+ *
+ * If you want to test if something's a kernel address, use is_kernel_addr().
+ */
+
+#define KERNELBASE      ASM_CONST(CONFIG_KERNEL_START)
+#define PAGE_OFFSET    ASM_CONST(CONFIG_PAGE_OFFSET)
+#define LOAD_OFFSET    ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
 
-#ifdef CONFIG_DISCONTIGMEM
-#define page_to_pfn(page)      discontigmem_page_to_pfn(page)
-#define pfn_to_page(pfn)       discontigmem_pfn_to_page(pfn)
-#define pfn_valid(pfn)         discontigmem_pfn_valid(pfn)
+#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_FLATMEM)
+#ifndef __ASSEMBLY__
+extern phys_addr_t memstart_addr;
+extern phys_addr_t kernstart_addr;
+#endif
+#define PHYSICAL_START kernstart_addr
+#define MEMORY_START   memstart_addr
+#else
+#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
+#define MEMORY_START   (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
 #endif
 
 #ifdef CONFIG_FLATMEM
-#define pfn_to_page(pfn)       (mem_map + (pfn))
-#define page_to_pfn(page)      ((unsigned long)((page) - mem_map))
-#define pfn_valid(pfn)         ((pfn) < max_mapnr)
+#define ARCH_PFN_OFFSET                (MEMORY_START >> PAGE_SHIFT)
+#define pfn_valid(pfn)         ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr))
 #endif
 
 #define virt_to_page(kaddr)    pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 
-#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
-#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
+#define __va(x) ((void *)((unsigned long)(x) - PHYSICAL_START + KERNELBASE))
+#define __pa(x) ((unsigned long)(x) + PHYSICAL_START - KERNELBASE)
 
 /*
  * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
@@ -83,9 +119,6 @@
 /* align addr on a size boundary - adjust address up if needed */
 #define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
 
-/* to align the pointer to the (next) page boundary */
-#define PAGE_ALIGN(addr)       _ALIGN(addr, PAGE_SIZE)
-
 /*
  * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
  * "kernelness", use is_kernel_addr() - it should do what you want.
@@ -114,6 +147,7 @@ typedef struct { pte_t pte; } real_pte_t;
 #endif
 
 /* PMD level */
+#ifdef CONFIG_PPC64
 typedef struct { unsigned long pmd; } pmd_t;
 #define pmd_val(x)     ((x).pmd)
 #define __pmd(x)       ((pmd_t) { (x) })
@@ -123,7 +157,8 @@ typedef struct { unsigned long pmd; } pmd_t;
 typedef struct { unsigned long pud; } pud_t;
 #define pud_val(x)     ((x).pud)
 #define __pud(x)       ((pud_t) { (x) })
-#endif
+#endif /* !CONFIG_PPC_64K_PAGES */
+#endif /* CONFIG_PPC64 */
 
 /* PGD level */
 typedef struct { unsigned long pgd; } pgd_t;
@@ -152,6 +187,7 @@ typedef unsigned long real_pte_t;
 #endif
 
 
+#ifdef CONFIG_PPC64
 typedef unsigned long pmd_t;
 #define pmd_val(x)     (x)
 #define __pmd(x)       (x)
@@ -160,7 +196,8 @@ typedef unsigned long pmd_t;
 typedef unsigned long pud_t;
 #define pud_val(x)     (x)
 #define __pud(x)       (x)
-#endif
+#endif /* !CONFIG_PPC_64K_PAGES */
+#endif /* CONFIG_PPC64 */
 
 typedef unsigned long pgd_t;
 #define pgd_val(x)     (x)
@@ -178,8 +215,11 @@ extern void copy_user_page(void *to, void *from, unsigned long vaddr,
                struct page *p);
 extern int page_is_ram(unsigned long pfn);
 
-#endif /* __ASSEMBLY__ */
+struct vm_area_struct;
 
-#endif /* __KERNEL__ */
+typedef struct page *pgtable_t;
+
+#include <asm-generic/memory_model.h>
+#endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_PAGE_H */