1 files changed, 261 insertions, 0 deletions

diff --git a/include/asm-ppc64/page.h b/include/asm-ppc64/page.h
new file mode 100644
index 000000000000..20e0f19324e8
--- /dev/null
+++ b/include/asm-ppc64/page.h
@@ -0,0 +1,261 @@
+#ifndef _PPC64_PAGE_H
+#define _PPC64_PAGE_H
+
+/*
+ * Copyright (C) 2001 PPC64 Team, IBM Corp
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+
+#ifdef __ASSEMBLY__
+  #define ASM_CONST(x) x
+#else
+  #define __ASM_CONST(x) x##UL
+  #define ASM_CONST(x) __ASM_CONST(x)
+#endif
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT      12
+#define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
+#define PAGE_MASK       (~(PAGE_SIZE-1))
+#define PAGE_OFFSET_MASK (PAGE_SIZE-1)
+
+#define SID_SHIFT       28
+#define SID_MASK        0xfffffffffUL
+#define ESID_MASK       0xfffffffff0000000UL
+#define GET_ESID(x)     (((x) >> SID_SHIFT) & SID_MASK)
+
+#define HPAGE_SHIFT     24
+#define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
+#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
+
+#ifdef CONFIG_HUGETLB_PAGE
+
+#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
+
+/* For 64-bit processes the hugepage range is 1T-1.5T */
+#define TASK_HPAGE_BASE ASM_CONST(0x0000010000000000)
+#define TASK_HPAGE_END  ASM_CONST(0x0000018000000000)
+
+#define LOW_ESID_MASK(addr, len)        (((1U << (GET_ESID(addr+len-1)+1)) \
+                                        - (1U << GET_ESID(addr))) & 0xffff)
+
+#define ARCH_HAS_HUGEPAGE_ONLY_RANGE
+#define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
+
+#define touches_hugepage_low_range(mm, addr, len) \
+        (LOW_ESID_MASK((addr), (len)) & mm->context.htlb_segs)
+#define touches_hugepage_high_range(addr, len) \
+        (((addr) > (TASK_HPAGE_BASE-(len))) && ((addr) < TASK_HPAGE_END))
+
+#define __within_hugepage_low_range(addr, len, segmask) \
+        ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask))
+#define within_hugepage_low_range(addr, len) \
+        __within_hugepage_low_range((addr), (len), \
+                                    current->mm->context.htlb_segs)
+#define within_hugepage_high_range(addr, len) (((addr) >= TASK_HPAGE_BASE) \
+          && ((addr)+(len) <= TASK_HPAGE_END) && ((addr)+(len) >= (addr)))
+
+#define is_hugepage_only_range(mm, addr, len) \
+        (touches_hugepage_high_range((addr), (len)) || \
+          touches_hugepage_low_range((mm), (addr), (len)))
+#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
+
+#define in_hugepage_area(context, addr) \
+        (cpu_has_feature(CPU_FTR_16M_PAGE) && \
+         ( (((addr) >= TASK_HPAGE_BASE) && ((addr) < TASK_HPAGE_END)) || \
+           ( ((addr) < 0x100000000L) && \
+             ((1 << GET_ESID(addr)) & (context).htlb_segs) ) ) )
+
+#else /* !CONFIG_HUGETLB_PAGE */
+
+#define in_hugepage_area(mm, addr)      0
+
+#endif /* !CONFIG_HUGETLB_PAGE */
+
+/* align addr on a size boundary - adjust address up/down if needed */
+#define _ALIGN_UP(addr,size)    (((addr)+((size)-1))&(~((size)-1)))
+#define _ALIGN_DOWN(addr,size)  ((addr)&(~((size)-1)))
+
+/* 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) double word boundary */
+#define DOUBLEWORD_ALIGN(addr)  _ALIGN(addr,sizeof(unsigned long))
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)        _ALIGN(addr, PAGE_SIZE)
+
+#ifdef __KERNEL__
+#ifndef __ASSEMBLY__
+#include <asm/cache.h>
+
+#undef STRICT_MM_TYPECHECKS
+
+#define REGION_SIZE   4UL
+#define REGION_SHIFT  60UL
+#define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
+#define REGION_STRIDE (1UL << REGION_SHIFT)
+
+static __inline__ void clear_page(void *addr)
+{
+        unsigned long lines, line_size;
+
+        line_size = ppc64_caches.dline_size;
+        lines = ppc64_caches.dlines_per_page;
+
+        __asm__ __volatile__(
+        "mtctr          %1      # clear_page\n\
+1:      dcbz    0,%0\n\
+        add     %0,%0,%3\n\
+        bdnz+   1b"
+        : "=r" (addr)
+        : "r" (lines), "0" (addr), "r" (line_size)
+        : "ctr", "memory");
+}
+
+extern void copy_page(void *to, void *from);
+struct page;
+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 *p);
+
+#ifdef STRICT_MM_TYPECHECKS
+/*
+ * These are used to make use of C type-checking.  
+ * Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
+ */
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned int  pmd; } pmd_t;
+typedef struct { unsigned int  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 unsigned long pte_t;
+typedef unsigned int  pmd_t;
+typedef unsigned int  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
+
+/* Pure 2^n version of get_order */
+static inline int get_order(unsigned long size)
+{
+        int order;
+
+        size = (size-1) >> (PAGE_SHIFT-1);
+        order = -1;
+        do {
+                size >>= 1;
+                order++;
+        } while (size);
+        return order;
+}
+
+#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
+
+extern int page_is_ram(unsigned long pfn);
+
+extern u64 ppc64_pft_size;              /* Log 2 of page table size */
+
+/* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
+#define __HAVE_ARCH_GATE_AREA           1
+
+#endif /* __ASSEMBLY__ */
+
+#ifdef MODULE
+#define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
+#else
+#define __page_aligned \
+        __attribute__((__aligned__(PAGE_SIZE), \
+                __section__(".data.page_aligned")))
+#endif
+
+
+/* This must match the -Ttext linker address            */
+/* Note: tophys & tovirt make assumptions about how     */
+/*       KERNELBASE is defined for performance reasons. */
+/*       When KERNELBASE moves, those macros may have   */
+/*             to change!                               */
+#define PAGE_OFFSET     ASM_CONST(0xC000000000000000)
+#define KERNELBASE      PAGE_OFFSET
+#define VMALLOCBASE     ASM_CONST(0xD000000000000000)
+#define IOREGIONBASE    ASM_CONST(0xE000000000000000)
+
+#define IO_REGION_ID       (IOREGIONBASE>>REGION_SHIFT)
+#define VMALLOC_REGION_ID  (VMALLOCBASE>>REGION_SHIFT)
+#define KERNEL_REGION_ID   (KERNELBASE>>REGION_SHIFT)
+#define USER_REGION_ID     (0UL)
+#define REGION_ID(X)       (((unsigned long)(X))>>REGION_SHIFT)
+
+#define __bpn_to_ba(x) ((((unsigned long)(x))<<PAGE_SHIFT) + KERNELBASE)
+#define __ba_to_bpn(x) ((((unsigned long)(x)) & ~REGION_MASK) >> PAGE_SHIFT)
+
+#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
+
+#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)
+#else
+#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 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)
+
+/*
+ * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
+ * and needs to be executable.  This means the whole heap ends
+ * up being executable.
+ */
+#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
+                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
+                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#define VM_DATA_DEFAULT_FLAGS \
+        (test_thread_flag(TIF_32BIT) ? \
+         VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
+
+/*
+ * This is the default if a program doesn't have a PT_GNU_STACK
+ * program header entry.
+ */
+#define VM_STACK_DEFAULT_FLAGS  (VM_READ | VM_WRITE | VM_EXEC | \
+                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#endif /* __KERNEL__ */
+#endif /* _PPC64_PAGE_H */