[PATCH] ppc64: pgtable.h and other header cleanups

This patch started as simply removing a few never-used macros from
asm-ppc64/pgtable.h, then kind of grew.  It now makes a bunch of
cleanups to the ppc64 low-level header files (with corresponding
changes to .c files where necessary) such as:
	- Abolishing never-used macros
	- Eliminating multiple #defines with the same purpose
	- Removing pointless macros (cases where just expanding the
macro everywhere turns out clearer and more sensible)
	- Removing some cases where macros which could be defined in
terms of each other weren't
	- Moving imalloc() related definitions from pgtable.h to their
own header file (imalloc.h)
	- Re-arranging headers to group things more logically
	- Moving all VSID allocation related things to mmu.h, instead
of being split between mmu.h and mmu_context.h
	- Removing some reserved space for flags from the PMD - we're
not using it.
	- Fix some bugs which broke compile with STRICT_MM_TYPECHECKS.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 203 insertions, 228 deletions

diff --git a/include/asm-ppc64/imalloc.h b/include/asm-ppc64/imalloc.h
new file mode 100644
index 000000000000..3a45e918bf16
--- /dev/null
+++ b/include/asm-ppc64/imalloc.h
@@ -0,0 +1,24 @@
+#ifndef _PPC64_IMALLOC_H
+#define _PPC64_IMALLOC_H
+
+/*
+ * Define the address range of the imalloc VM area.
+ */
+#define PHBS_IO_BASE      IOREGIONBASE
+#define IMALLOC_BASE      (IOREGIONBASE + 0x80000000ul) /* Reserve 2 gigs for PHBs */
+#define IMALLOC_END       (IOREGIONBASE + EADDR_MASK)
+
+
+/* imalloc region types */
+#define IM_REGION_UNUSED        0x1
+#define IM_REGION_SUBSET        0x2
+#define IM_REGION_EXISTS        0x4
+#define IM_REGION_OVERLAP       0x8
+#define IM_REGION_SUPERSET      0x10
+
+extern struct vm_struct * im_get_free_area(unsigned long size);
+extern struct vm_struct * im_get_area(unsigned long v_addr, unsigned long size,
+                        int region_type);
+unsigned long im_free(void *addr);
+
+#endif /* _PPC64_IMALLOC_H */
diff --git a/include/asm-ppc64/mmu.h b/include/asm-ppc64/mmu.h
index 188987e9d9d4..c78282a67d8e 100644
--- a/include/asm-ppc64/mmu.h
+++ b/include/asm-ppc64/mmu.h
@@ -15,19 +15,10 @@
 
 #include <linux/config.h>
 #include <asm/page.h>
-#include <linux/stringify.h>
 
-#ifndef __ASSEMBLY__
-
-/* Time to allow for more things here */
-typedef unsigned long mm_context_id_t;
-typedef struct {
-        mm_context_id_t id;
-#ifdef CONFIG_HUGETLB_PAGE
-        pgd_t *huge_pgdir;
-        u16 htlb_segs; /* bitmask */
-#endif
-} mm_context_t;
+/*
+ * Segment table
+ */
 
 #define STE_ESID_V      0x80
 #define STE_ESID_KS     0x20
@@ -36,15 +27,48 @@ typedef struct {
 
 #define STE_VSID_SHIFT  12
 
-struct stab_entry {
-        unsigned long esid_data;
-        unsigned long vsid_data;
-};
+/* Location of cpu0's segment table */
+#define STAB0_PAGE      0x9
+#define STAB0_PHYS_ADDR (STAB0_PAGE<<PAGE_SHIFT)
+#define STAB0_VIRT_ADDR (KERNELBASE+STAB0_PHYS_ADDR)
+
+/*
+ * SLB
+ */
 
-/* Hardware Page Table Entry */
+#define SLB_NUM_BOLTED          3
+#define SLB_CACHE_ENTRIES       8
+
+/* Bits in the SLB ESID word */
+#define SLB_ESID_V              ASM_CONST(0x0000000008000000) /* valid */
+
+/* Bits in the SLB VSID word */
+#define SLB_VSID_SHIFT          12
+#define SLB_VSID_KS             ASM_CONST(0x0000000000000800)
+#define SLB_VSID_KP             ASM_CONST(0x0000000000000400)
+#define SLB_VSID_N              ASM_CONST(0x0000000000000200) /* no-execute */
+#define SLB_VSID_L              ASM_CONST(0x0000000000000100) /* largepage 16M */
+#define SLB_VSID_C              ASM_CONST(0x0000000000000080) /* class */
+
+#define SLB_VSID_KERNEL         (SLB_VSID_KP|SLB_VSID_C)
+#define SLB_VSID_USER           (SLB_VSID_KP|SLB_VSID_KS)
+
+/*
+ * Hash table
+ */
 
 #define HPTES_PER_GROUP 8
 
+/* Values for PP (assumes Ks=0, Kp=1) */
+/* pp0 will always be 0 for linux     */
+#define PP_RWXX 0       /* Supervisor read/write, User none */
+#define PP_RWRX 1       /* Supervisor read/write, User read */
+#define PP_RWRW 2       /* Supervisor read/write, User read/write */
+#define PP_RXRX 3       /* Supervisor read,       User read */
+
+#ifndef __ASSEMBLY__
+
+/* Hardware Page Table Entry */
 typedef struct {
         unsigned long avpn:57; /* vsid | api == avpn  */
         unsigned long :     2; /* Software use */
@@ -90,14 +114,6 @@ typedef struct {
         } dw1;
 } HPTE; 
 
-/* Values for PP (assumes Ks=0, Kp=1) */
-/* pp0 will always be 0 for linux     */
-#define PP_RWXX 0       /* Supervisor read/write, User none */
-#define PP_RWRX 1       /* Supervisor read/write, User read */
-#define PP_RWRW 2       /* Supervisor read/write, User read/write */
-#define PP_RXRX 3       /* Supervisor read,       User read */
-
-
 extern HPTE *           htab_address;
 extern unsigned long    htab_hash_mask;
 
@@ -174,31 +190,70 @@ extern int __hash_page(unsigned long ea, unsigned long access,
 
 extern void htab_finish_init(void);
 
+extern void hpte_init_native(void);
+extern void hpte_init_lpar(void);
+extern void hpte_init_iSeries(void);
+
+extern long pSeries_lpar_hpte_insert(unsigned long hpte_group,
+                                     unsigned long va, unsigned long prpn,
+                                     int secondary, unsigned long hpteflags,
+                                     int bolted, int large);
+extern long native_hpte_insert(unsigned long hpte_group, unsigned long va,
+                               unsigned long prpn, int secondary,
+                               unsigned long hpteflags, int bolted, int large);
+
 #endif /* __ASSEMBLY__ */
 
 /*
- * Location of cpu0's segment table
+ * VSID allocation
+ *
+ * We first generate a 36-bit "proto-VSID".  For kernel addresses this
+ * is equal to the ESID, for user addresses it is:
+ *      (context << 15) | (esid & 0x7fff)
+ *
+ * The two forms are distinguishable because the top bit is 0 for user
+ * addresses, whereas the top two bits are 1 for kernel addresses.
+ * Proto-VSIDs with the top two bits equal to 0b10 are reserved for
+ * now.
+ *
+ * The proto-VSIDs are then scrambled into real VSIDs with the
+ * multiplicative hash:
+ *
+ *      VSID = (proto-VSID * VSID_MULTIPLIER) % VSID_MODULUS
+ *      where   VSID_MULTIPLIER = 268435399 = 0xFFFFFC7
+ *              VSID_MODULUS = 2^36-1 = 0xFFFFFFFFF
+ *
+ * This scramble is only well defined for proto-VSIDs below
+ * 0xFFFFFFFFF, so both proto-VSID and actual VSID 0xFFFFFFFFF are
+ * reserved.  VSID_MULTIPLIER is prime, so in particular it is
+ * co-prime to VSID_MODULUS, making this a 1:1 scrambling function.
+ * Because the modulus is 2^n-1 we can compute it efficiently without
+ * a divide or extra multiply (see below).
+ *
+ * This scheme has several advantages over older methods:
+ *
+ *      - We have VSIDs allocated for every kernel address
+ * (i.e. everything above 0xC000000000000000), except the very top
+ * segment, which simplifies several things.
+ *
+ *      - We allow for 15 significant bits of ESID and 20 bits of
+ * context for user addresses.  i.e. 8T (43 bits) of address space for
+ * up to 1M contexts (although the page table structure and context
+ * allocation will need changes to take advantage of this).
+ *
+ *      - The scramble function gives robust scattering in the hash
+ * table (at least based on some initial results).  The previous
+ * method was more susceptible to pathological cases giving excessive
+ * hash collisions.
+ */
+/*
+ * WARNING - If you change these you must make sure the asm
+ * implementations in slb_allocate (slb_low.S), do_stab_bolted
+ * (head.S) and ASM_VSID_SCRAMBLE (below) are changed accordingly.
+ *
+ * You'll also need to change the precomputed VSID values in head.S
+ * which are used by the iSeries firmware.
  */
-#define STAB0_PAGE      0x9
-#define STAB0_PHYS_ADDR (STAB0_PAGE<<PAGE_SHIFT)
-#define STAB0_VIRT_ADDR (KERNELBASE+STAB0_PHYS_ADDR)
-
-#define SLB_NUM_BOLTED          3
-#define SLB_CACHE_ENTRIES       8
-
-/* Bits in the SLB ESID word */
-#define SLB_ESID_V              0x0000000008000000      /* entry is valid */
-
-/* Bits in the SLB VSID word */
-#define SLB_VSID_SHIFT          12
-#define SLB_VSID_KS             0x0000000000000800
-#define SLB_VSID_KP             0x0000000000000400
-#define SLB_VSID_N              0x0000000000000200      /* no-execute */
-#define SLB_VSID_L              0x0000000000000100      /* largepage (4M) */
-#define SLB_VSID_C              0x0000000000000080      /* class */
-
-#define SLB_VSID_KERNEL         (SLB_VSID_KP|SLB_VSID_C)
-#define SLB_VSID_USER           (SLB_VSID_KP|SLB_VSID_KS)
 
 #define VSID_MULTIPLIER ASM_CONST(200730139)    /* 28-bit prime */
 #define VSID_BITS       36
@@ -239,4 +294,50 @@ extern void htab_finish_init(void);
         srdi    rx,rx,VSID_BITS;        /* extract 2^36 bit */          \
         add     rt,rt,rx
 
+
+#ifndef __ASSEMBLY__
+
+typedef unsigned long mm_context_id_t;
+
+typedef struct {
+        mm_context_id_t id;
+#ifdef CONFIG_HUGETLB_PAGE
+        pgd_t *huge_pgdir;
+        u16 htlb_segs; /* bitmask */
+#endif
+} mm_context_t;
+
+
+static inline unsigned long vsid_scramble(unsigned long protovsid)
+{
+#if 0
+        /* The code below is equivalent to this function for arguments
+         * < 2^VSID_BITS, which is all this should ever be called
+         * with.  However gcc is not clever enough to compute the
+         * modulus (2^n-1) without a second multiply. */
+        return ((protovsid * VSID_MULTIPLIER) % VSID_MODULUS);
+#else /* 1 */
+        unsigned long x;
+
+        x = protovsid * VSID_MULTIPLIER;
+        x = (x >> VSID_BITS) + (x & VSID_MODULUS);
+        return (x + ((x+1) >> VSID_BITS)) & VSID_MODULUS;
+#endif /* 1 */
+}
+
+/* This is only valid for addresses >= KERNELBASE */
+static inline unsigned long get_kernel_vsid(unsigned long ea)
+{
+        return vsid_scramble(ea >> SID_SHIFT);
+}
+
+/* This is only valid for user addresses (which are below 2^41) */
+static inline unsigned long get_vsid(unsigned long context, unsigned long ea)
+{
+        return vsid_scramble((context << USER_ESID_BITS)
+                             | (ea >> SID_SHIFT));
+}
+
+#endif /* __ASSEMBLY */
+
 #endif /* _PPC64_MMU_H_ */
diff --git a/include/asm-ppc64/mmu_context.h b/include/asm-ppc64/mmu_context.h
index c2e8e0466383..77a743402db4 100644
--- a/include/asm-ppc64/mmu_context.h
+++ b/include/asm-ppc64/mmu_context.h
@@ -84,86 +84,4 @@ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
         local_irq_restore(flags);
 }
 
-/* VSID allocation
- * ===============
- *
- * We first generate a 36-bit "proto-VSID".  For kernel addresses this
- * is equal to the ESID, for user addresses it is:
- *      (context << 15) | (esid & 0x7fff)
- *
- * The two forms are distinguishable because the top bit is 0 for user
- * addresses, whereas the top two bits are 1 for kernel addresses.
- * Proto-VSIDs with the top two bits equal to 0b10 are reserved for
- * now.
- *
- * The proto-VSIDs are then scrambled into real VSIDs with the
- * multiplicative hash:
- *
- *      VSID = (proto-VSID * VSID_MULTIPLIER) % VSID_MODULUS
- *      where   VSID_MULTIPLIER = 268435399 = 0xFFFFFC7
- *              VSID_MODULUS = 2^36-1 = 0xFFFFFFFFF
- *
- * This scramble is only well defined for proto-VSIDs below
- * 0xFFFFFFFFF, so both proto-VSID and actual VSID 0xFFFFFFFFF are
- * reserved.  VSID_MULTIPLIER is prime, so in particular it is
- * co-prime to VSID_MODULUS, making this a 1:1 scrambling function.
- * Because the modulus is 2^n-1 we can compute it efficiently without
- * a divide or extra multiply (see below).
- *
- * This scheme has several advantages over older methods:
- *
- *      - We have VSIDs allocated for every kernel address
- * (i.e. everything above 0xC000000000000000), except the very top
- * segment, which simplifies several things.
- *
- *      - We allow for 15 significant bits of ESID and 20 bits of
- * context for user addresses.  i.e. 8T (43 bits) of address space for
- * up to 1M contexts (although the page table structure and context
- * allocation will need changes to take advantage of this).
- *
- *      - The scramble function gives robust scattering in the hash
- * table (at least based on some initial results).  The previous
- * method was more susceptible to pathological cases giving excessive
- * hash collisions.
- */
-
-/*
- * WARNING - If you change these you must make sure the asm
- * implementations in slb_allocate(), do_stab_bolted and mmu.h
- * (ASM_VSID_SCRAMBLE macro) are changed accordingly.
- *
- * You'll also need to change the precomputed VSID values in head.S
- * which are used by the iSeries firmware.
- */
-
-static inline unsigned long vsid_scramble(unsigned long protovsid)
-{
-#if 0
-        /* The code below is equivalent to this function for arguments
-         * < 2^VSID_BITS, which is all this should ever be called
-         * with.  However gcc is not clever enough to compute the
-         * modulus (2^n-1) without a second multiply. */
-        return ((protovsid * VSID_MULTIPLIER) % VSID_MODULUS);
-#else /* 1 */
-        unsigned long x;
-
-        x = protovsid * VSID_MULTIPLIER;
-        x = (x >> VSID_BITS) + (x & VSID_MODULUS);
-        return (x + ((x+1) >> VSID_BITS)) & VSID_MODULUS;
-#endif /* 1 */
-}
-
-/* This is only valid for addresses >= KERNELBASE */
-static inline unsigned long get_kernel_vsid(unsigned long ea)
-{
-        return vsid_scramble(ea >> SID_SHIFT);
-}
-
-/* This is only valid for user addresses (which are below 2^41) */
-static inline unsigned long get_vsid(unsigned long context, unsigned long ea)
-{
-        return vsid_scramble((context << USER_ESID_BITS)
-                             | (ea >> SID_SHIFT));
-}
-
 #endif /* __PPC64_MMU_CONTEXT_H */
diff --git a/include/asm-ppc64/page.h b/include/asm-ppc64/page.h
index 86219574c1a5..bcd21789d3b7 100644
--- a/include/asm-ppc64/page.h
+++ b/include/asm-ppc64/page.h
@@ -23,7 +23,6 @@
 #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
@@ -85,9 +84,6 @@
 /* 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) 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)
 
@@ -100,7 +96,6 @@
 #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)
 {
@@ -209,13 +204,13 @@ extern u64 ppc64_pft_size;		/* Log 2 of page table size */
 #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 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 REGION_ID(ea)      (((unsigned long)(ea)) >> REGION_SHIFT)
 
-#define __bpn_to_ba(x) ((((unsigned long)(x))<<PAGE_SHIFT) + KERNELBASE)
+#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))
diff --git a/include/asm-ppc64/pgtable.h b/include/asm-ppc64/pgtable.h
index b984e2747e0c..264c4f7993be 100644
--- a/include/asm-ppc64/pgtable.h
+++ b/include/asm-ppc64/pgtable.h
@@ -17,16 +17,6 @@
 
 #include <asm-generic/pgtable-nopud.h>
 
-/* PMD_SHIFT determines what a second-level page table entry can map */
-#define PMD_SHIFT       (PAGE_SHIFT + PAGE_SHIFT - 3)
-#define PMD_SIZE        (1UL << PMD_SHIFT)
-#define PMD_MASK        (~(PMD_SIZE-1))
-
-/* PGDIR_SHIFT determines what a third-level page table entry can map */
-#define PGDIR_SHIFT     (PAGE_SHIFT + (PAGE_SHIFT - 3) + (PAGE_SHIFT - 2))
-#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
-#define PGDIR_MASK      (~(PGDIR_SIZE-1))
-
 /*
  * Entries per page directory level.  The PTE level must use a 64b record
  * for each page table entry.  The PMD and PGD level use a 32b record for 
@@ -40,40 +30,30 @@
 #define PTRS_PER_PMD    (1 << PMD_INDEX_SIZE)
 #define PTRS_PER_PGD    (1 << PGD_INDEX_SIZE)
 
-#define USER_PTRS_PER_PGD       (1024)
-#define FIRST_USER_ADDRESS      0
+/* PMD_SHIFT determines what a second-level page table entry can map */
+#define PMD_SHIFT       (PAGE_SHIFT + PTE_INDEX_SIZE)
+#define PMD_SIZE        (1UL << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
 
-#define EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
-                    PGD_INDEX_SIZE + PAGE_SHIFT) 
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define PGDIR_SHIFT     (PMD_SHIFT + PMD_INDEX_SIZE)
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+
+#define FIRST_USER_ADDRESS      0
 
 /*
  * Size of EA range mapped by our pagetables.
  */
-#define PGTABLE_EA_BITS 41
-#define PGTABLE_EA_MASK ((1UL<<PGTABLE_EA_BITS)-1)
+#define EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
+                    PGD_INDEX_SIZE + PAGE_SHIFT)
+#define EADDR_MASK ((1UL << EADDR_SIZE) - 1)
 
 /*
  * Define the address range of the vmalloc VM area.
  */
 #define VMALLOC_START (0xD000000000000000ul)
-#define VMALLOC_END   (VMALLOC_START + PGTABLE_EA_MASK)
-
-/*
- * Define the address range of the imalloc VM area.
- * (used for ioremap)
- */
-#define IMALLOC_START     (ioremap_bot)
-#define IMALLOC_VMADDR(x) ((unsigned long)(x))
-#define PHBS_IO_BASE      (0xE000000000000000ul)        /* Reserve 2 gigs for PHBs */
-#define IMALLOC_BASE      (0xE000000080000000ul)  
-#define IMALLOC_END       (IMALLOC_BASE + PGTABLE_EA_MASK)
-
-/*
- * Define the user address range
- */
-#define USER_START (0UL)
-#define USER_END   (USER_START + PGTABLE_EA_MASK)
-
+#define VMALLOC_END   (VMALLOC_START + EADDR_MASK)
 
 /*
  * Bits in a linux-style PTE.  These match the bits in the
@@ -168,10 +148,6 @@ extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
 /* shift to put page number into pte */
 #define PTE_SHIFT (17)
 
-/* We allow 2^41 bytes of real memory, so we need 29 bits in the PMD
- * to give the PTE page number.  The bottom two bits are for flags. */
-#define PMD_TO_PTEPAGE_SHIFT (2)
-
 #ifdef CONFIG_HUGETLB_PAGE
 
 #ifndef __ASSEMBLY__
@@ -200,13 +176,14 @@ void hugetlb_mm_free_pgd(struct mm_struct *mm);
  */
 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 
-#define pfn_pte(pfn,pgprot)                                             \
-({                                                                      \
-        pte_t pte;                                                      \
-        pte_val(pte) = ((unsigned long)(pfn) << PTE_SHIFT) |            \
-                        pgprot_val(pgprot);                             \
-        pte;                                                            \
-})
+static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
+{
+        pte_t pte;
+
+
+        pte_val(pte) = (pfn << PTE_SHIFT) | pgprot_val(pgprot);
+        return pte;
+}
 
 #define pte_modify(_pte, newprot) \
   (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
@@ -220,13 +197,12 @@ void hugetlb_mm_free_pgd(struct mm_struct *mm);
 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 
 #define pmd_set(pmdp, ptep)     \
-        (pmd_val(*(pmdp)) = (__ba_to_bpn(ptep) << PMD_TO_PTEPAGE_SHIFT))
+        (pmd_val(*(pmdp)) = __ba_to_bpn(ptep))
 #define pmd_none(pmd)           (!pmd_val(pmd))
 #define pmd_bad(pmd)            (pmd_val(pmd) == 0)
 #define pmd_present(pmd)        (pmd_val(pmd) != 0)
 #define pmd_clear(pmdp)         (pmd_val(*(pmdp)) = 0)
-#define pmd_page_kernel(pmd)    \
-        (__bpn_to_ba(pmd_val(pmd) >> PMD_TO_PTEPAGE_SHIFT))
+#define pmd_page_kernel(pmd)    (__bpn_to_ba(pmd_val(pmd)))
 #define pmd_page(pmd)           virt_to_page(pmd_page_kernel(pmd))
 
 #define pud_set(pudp, pmdp)     (pud_val(*(pudp)) = (__ba_to_bpn(pmdp)))
@@ -266,8 +242,6 @@ void hugetlb_mm_free_pgd(struct mm_struct *mm);
 /* to find an entry in the ioremap page-table-directory */
 #define pgd_offset_i(address) (ioremap_pgd + pgd_index(address))
 
-#define pages_to_mb(x)          ((x) >> (20-PAGE_SHIFT))
-
 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
@@ -442,7 +416,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
                 pte_clear(mm, addr, ptep);
                 flush_tlb_pending();
         }
-        *ptep = __pte(pte_val(pte)) & ~_PAGE_HPTEFLAGS;
+        *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
 }
 
 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
@@ -487,18 +461,13 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
 
 extern unsigned long ioremap_bot, ioremap_base;
 
-#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
-#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
-
-#define pte_ERROR(e) \
-        printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
 #define pmd_ERROR(e) \
         printk("%s:%d: bad pmd %08x.\n", __FILE__, __LINE__, pmd_val(e))
 #define pgd_ERROR(e) \
         printk("%s:%d: bad pgd %08x.\n", __FILE__, __LINE__, pgd_val(e))
 
-extern pgd_t swapper_pg_dir[1024];
-extern pgd_t ioremap_dir[1024];
+extern pgd_t swapper_pg_dir[];
+extern pgd_t ioremap_dir[];
 
 extern void paging_init(void);
 
@@ -540,43 +509,11 @@ extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
  */
 #define kern_addr_valid(addr)   (1)
 
-#define io_remap_page_range(vma, vaddr, paddr, size, prot)              \
-                remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
-
 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 
-#define MK_IOSPACE_PFN(space, pfn)      (pfn)
-#define GET_IOSPACE(pfn)                0
-#define GET_PFN(pfn)                    (pfn)
-
 void pgtable_cache_init(void);
 
-extern void hpte_init_native(void);
-extern void hpte_init_lpar(void);
-extern void hpte_init_iSeries(void);
-
-/* imalloc region types */
-#define IM_REGION_UNUSED        0x1
-#define IM_REGION_SUBSET        0x2
-#define IM_REGION_EXISTS        0x4
-#define IM_REGION_OVERLAP       0x8
-#define IM_REGION_SUPERSET      0x10
-
-extern struct vm_struct * im_get_free_area(unsigned long size);
-extern struct vm_struct * im_get_area(unsigned long v_addr, unsigned long size,
-                        int region_type);
-unsigned long im_free(void *addr);
-
-extern long pSeries_lpar_hpte_insert(unsigned long hpte_group,
-                                     unsigned long va, unsigned long prpn,
-                                     int secondary, unsigned long hpteflags,
-                                     int bolted, int large);
-
-extern long native_hpte_insert(unsigned long hpte_group, unsigned long va,
-                               unsigned long prpn, int secondary,
-                               unsigned long hpteflags, int bolted, int large);
-
 /*
  * find_linux_pte returns the address of a linux pte for a given 
  * effective address and directory.  If not found, it returns zero.