1 files changed, 169 insertions, 0 deletions

diff --git a/include/asm-ppc/page.h b/include/asm-ppc/page.h
new file mode 100644
index 000000000000..4789dc024240
--- /dev/null
+++ b/include/asm-ppc/page.h
@@ -0,0 +1,169 @@
+#ifndef _PPC_PAGE_H
+#define _PPC_PAGE_H
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT      12
+#define PAGE_SIZE       (1UL << PAGE_SHIFT)
+
+/*
+ * Subtle: this is an int (not an unsigned long) and so it
+ * gets extended to 64 bits the way want (i.e. with 1s).  -- paulus
+ */
+#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
+
+#ifdef __KERNEL__
+#include <linux/config.h>
+
+/* This must match what is in arch/ppc/Makefile */
+#define PAGE_OFFSET     CONFIG_KERNEL_START
+#define KERNELBASE      PAGE_OFFSET
+
+#ifndef __ASSEMBLY__
+
+/*
+ * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
+ * physical addressing.  For now this just the IBM PPC440.
+ */
+#ifdef CONFIG_PTE_64BIT
+typedef unsigned long long pte_basic_t;
+#define PTE_SHIFT       (PAGE_SHIFT - 3)        /* 512 ptes per page */
+#define PTE_FMT         "%16Lx"
+#else
+typedef unsigned long pte_basic_t;
+#define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
+#define PTE_FMT         "%.8lx"
+#endif
+
+#undef STRICT_MM_TYPECHECKS
+
+#ifdef STRICT_MM_TYPECHECKS
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { pte_basic_t pte; } pte_t;
+typedef struct { unsigned long pmd; } pmd_t;
+typedef struct { unsigned long pgd; } pgd_t;
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+#define pte_val(x)      ((x).pte)
+#define pmd_val(x)      ((x).pmd)
+#define pgd_val(x)      ((x).pgd)
+#define pgprot_val(x)   ((x).pgprot)
+
+#define __pte(x)        ((pte_t) { (x) } )
+#define __pmd(x)        ((pmd_t) { (x) } )
+#define __pgd(x)        ((pgd_t) { (x) } )
+#define __pgprot(x)     ((pgprot_t) { (x) } )
+
+#else
+/*
+ * .. while these make it easier on the compiler
+ */
+typedef pte_basic_t pte_t;
+typedef unsigned long pmd_t;
+typedef unsigned long pgd_t;
+typedef unsigned long pgprot_t;
+
+#define pte_val(x)      (x)
+#define pmd_val(x)      (x)
+#define pgd_val(x)      (x)
+#define pgprot_val(x)   (x)
+
+#define __pte(x)        (x)
+#define __pmd(x)        (x)
+#define __pgd(x)        (x)
+#define __pgprot(x)     (x)
+
+#endif
+
+
+/* align addr on a size boundary - adjust address up if needed -- Cort */
+#define _ALIGN(addr,size)       (((addr)+(size)-1)&(~((size)-1)))
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
+struct page;
+extern void clear_pages(void *page, int order);
+static inline void clear_page(void *page) { clear_pages(page, 0); }
+extern void copy_page(void *to, void *from);
+extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
+extern void copy_user_page(void *to, void *from, unsigned long vaddr,
+                           struct page *pg);
+
+#ifndef CONFIG_APUS
+#define PPC_MEMSTART    0
+#define PPC_PGSTART     0
+#define PPC_MEMOFFSET   PAGE_OFFSET
+#else
+extern unsigned long ppc_memstart;
+extern unsigned long ppc_pgstart;
+extern unsigned long ppc_memoffset;
+#define PPC_MEMSTART    ppc_memstart
+#define PPC_PGSTART     ppc_pgstart
+#define PPC_MEMOFFSET   ppc_memoffset
+#endif
+
+#if defined(CONFIG_APUS) && !defined(MODULE)
+/* map phys->virtual and virtual->phys for RAM pages */
+static inline unsigned long ___pa(unsigned long v)
+{
+        unsigned long p;
+        asm volatile ("1: addis %0, %1, %2;"
+                      ".section \".vtop_fixup\",\"aw\";"
+                      ".align  1;"
+                      ".long   1b;"
+                      ".previous;"
+                      : "=r" (p)
+                      : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
+
+        return p;
+}
+static inline void* ___va(unsigned long p)
+{
+        unsigned long v;
+        asm volatile ("1: addis %0, %1, %2;"
+                      ".section \".ptov_fixup\",\"aw\";"
+                      ".align  1;"
+                      ".long   1b;"
+                      ".previous;"
+                      : "=r" (v)
+                      : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
+
+        return (void*) v;
+}
+#else
+#define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
+#define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
+#endif
+
+extern int page_is_ram(unsigned long pfn);
+
+#define __pa(x) ___pa((unsigned long)(x))
+#define __va(x) ((void *)(___va((unsigned long)(x))))
+
+#define pfn_to_page(pfn)        (mem_map + ((pfn) - PPC_PGSTART))
+#define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + PPC_PGSTART)
+#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define page_to_virt(page)      __va(page_to_pfn(page) << PAGE_SHIFT)
+
+#define pfn_valid(pfn)          (((pfn) - PPC_PGSTART) < max_mapnr)
+#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+
+/* Pure 2^n version of get_order */
+extern __inline__ int get_order(unsigned long size)
+{
+        int lz;
+
+        size = (size-1) >> PAGE_SHIFT;
+        asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
+        return 32 - lz;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
+                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#endif /* __KERNEL__ */
+#endif /* _PPC_PAGE_H */