powerpc: Merge enough to start building in arch/powerpc.

This creates the directory structure under arch/powerpc and a bunch
of Kconfig files.  It does a first-cut merge of arch/powerpc/mm,
arch/powerpc/lib and arch/powerpc/platforms/powermac.  This is enough
to build a 32-bit powermac kernel with ARCH=powerpc.

For now we are getting some unmerged files from arch/ppc/kernel and
arch/ppc/syslib, or arch/ppc64/kernel.  This makes some minor changes
to files in those directories and files outside arch/powerpc.

The boot directory is still not merged.  That's going to be interesting.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 183 insertions, 0 deletions

diff --git a/arch/powerpc/mm/tlb.c b/arch/powerpc/mm/tlb.c
new file mode 100644
index 000000000000..6c3dc3c44c86
--- /dev/null
+++ b/arch/powerpc/mm/tlb.c
@@ -0,0 +1,183 @@
+/*
+ * This file contains the routines for TLB flushing.
+ * On machines where the MMU uses a hash table to store virtual to
+ * physical translations, these routines flush entries from the
+ * hash table also.
+ *  -- paulus
+ *
+ *  Derived from arch/ppc/mm/init.c:
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
+ *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
+ *    Copyright (C) 1996 Paul Mackerras
+ *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
+ *
+ *  Derived from "arch/i386/mm/init.c"
+ *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ *
+ *  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>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <asm/tlbflush.h>
+#include <asm/tlb.h>
+
+#include "mmu_decl.h"
+
+/*
+ * Called when unmapping pages to flush entries from the TLB/hash table.
+ */
+void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
+{
+        unsigned long ptephys;
+
+        if (Hash != 0) {
+                ptephys = __pa(ptep) & PAGE_MASK;
+                flush_hash_pages(mm->context, addr, ptephys, 1);
+        }
+}
+
+/*
+ * Called by ptep_set_access_flags, must flush on CPUs for which the
+ * DSI handler can't just "fixup" the TLB on a write fault
+ */
+void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr)
+{
+        if (Hash != 0)
+                return;
+        _tlbie(addr);
+}
+
+/*
+ * Called at the end of a mmu_gather operation to make sure the
+ * TLB flush is completely done.
+ */
+void tlb_flush(struct mmu_gather *tlb)
+{
+        if (Hash == 0) {
+                /*
+                 * 603 needs to flush the whole TLB here since
+                 * it doesn't use a hash table.
+                 */
+                _tlbia();
+        }
+}
+
+/*
+ * TLB flushing:
+ *
+ *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ *  - flush_tlb_page(vma, vmaddr) flushes one page
+ *  - flush_tlb_range(vma, start, end) flushes a range of pages
+ *  - flush_tlb_kernel_range(start, end) flushes kernel pages
+ *
+ * since the hardware hash table functions as an extension of the
+ * tlb as far as the linux tables are concerned, flush it too.
+ *    -- Cort
+ */
+
+/*
+ * 750 SMP is a Bad Idea because the 750 doesn't broadcast all
+ * the cache operations on the bus.  Hence we need to use an IPI
+ * to get the other CPU(s) to invalidate their TLBs.
+ */
+#ifdef CONFIG_SMP_750
+#define FINISH_FLUSH    smp_send_tlb_invalidate(0)
+#else
+#define FINISH_FLUSH    do { } while (0)
+#endif
+
+static void flush_range(struct mm_struct *mm, unsigned long start,
+                        unsigned long end)
+{
+        pmd_t *pmd;
+        unsigned long pmd_end;
+        int count;
+        unsigned int ctx = mm->context;
+
+        if (Hash == 0) {
+                _tlbia();
+                return;
+        }
+        start &= PAGE_MASK;
+        if (start >= end)
+                return;
+        end = (end - 1) | ~PAGE_MASK;
+        pmd = pmd_offset(pgd_offset(mm, start), start);
+        for (;;) {
+                pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
+                if (pmd_end > end)
+                        pmd_end = end;
+                if (!pmd_none(*pmd)) {
+                        count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
+                        flush_hash_pages(ctx, start, pmd_val(*pmd), count);
+                }
+                if (pmd_end == end)
+                        break;
+                start = pmd_end + 1;
+                ++pmd;
+        }
+}
+
+/*
+ * Flush kernel TLB entries in the given range
+ */
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+        flush_range(&init_mm, start, end);
+        FINISH_FLUSH;
+}
+
+/*
+ * Flush all the (user) entries for the address space described by mm.
+ */
+void flush_tlb_mm(struct mm_struct *mm)
+{
+        struct vm_area_struct *mp;
+
+        if (Hash == 0) {
+                _tlbia();
+                return;
+        }
+
+        for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
+                flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
+        FINISH_FLUSH;
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+        struct mm_struct *mm;
+        pmd_t *pmd;
+
+        if (Hash == 0) {
+                _tlbie(vmaddr);
+                return;
+        }
+        mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
+        pmd = pmd_offset(pgd_offset(mm, vmaddr), vmaddr);
+        if (!pmd_none(*pmd))
+                flush_hash_pages(mm->context, vmaddr, pmd_val(*pmd), 1);
+        FINISH_FLUSH;
+}
+
+/*
+ * For each address in the range, find the pte for the address
+ * and check _PAGE_HASHPTE bit; if it is set, find and destroy
+ * the corresponding HPTE.
+ */
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+                     unsigned long end)
+{
+        flush_range(vma->vm_mm, start, end);
+        FINISH_FLUSH;
+}