*/
#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
+/*
+ * 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.
+ *
+ * To get a physical address from a virtual one you subtract PAGE_OFFSET,
+ * _not_ KERNELBASE.
+ *
+ * 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().
+ */
+
+#ifdef CONFIG_CRASH_DUMP
+/* Kdump kernel runs at 32 MB, change at your peril. */
+#define PHYSICAL_START 0x2000000
+#else
+#define PHYSICAL_START 0x0
+#endif
+
#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
-#define KERNELBASE PAGE_OFFSET
+#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
#ifdef CONFIG_DISCONTIGMEM
#define page_to_pfn(page) discontigmem_page_to_pfn(page)
#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)
#endif
#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 __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
/*
#define pmd_val(x) (x)
#define __pmd(x) (x)
-#ifndef CONFIG_PPC_64K_PAGES
+#if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_64K_PAGES)
typedef unsigned long pud_t;
#define pud_val(x) (x)
#define __pud(x) (x)
struct page *p);
extern int page_is_ram(unsigned long pfn);
+#include <asm-generic/memory_model.h>
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */