Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 166 insertions, 0 deletions

diff --git a/arch/parisc/mm/kmap.c b/arch/parisc/mm/kmap.c
new file mode 100644
index 000000000000..1b1acd5e2f6e
--- /dev/null
+++ b/arch/parisc/mm/kmap.c
@@ -0,0 +1,166 @@
+/* 
+ *    kmap/page table map and unmap support routines
+ *
+ *    Copyright 1999,2000 Hewlett-Packard Company
+ *    Copyright 2000 John Marvin <jsm at hp.com>
+ *    Copyright 2000 Grant Grundler <grundler at parisc-linux.org>
+ *    Copyright 2000 Philipp Rumpf <prumpf@tux.org>
+ *
+ *
+ *    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.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+/*
+** Stolen mostly from arch/parisc/kernel/pci-dma.c
+*/
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+
+#include <asm/io.h>
+#include <asm/page.h>           /* get_order */
+
+#undef flush_cache_all
+#define flush_cache_all flush_all_caches
+
+typedef void (*pte_iterator_t) (pte_t * pte, unsigned long arg);
+
+#if 0
+/* XXX This routine could be used with iterate_page() to replace
+ * unmap_uncached_page() and save a little code space but I didn't
+ * do that since I'm not certain whether this is the right path. -PB
+ */
+static void unmap_cached_pte(pte_t * pte, unsigned long addr, unsigned long arg)
+{
+        pte_t page = *pte;
+        pte_clear(&init_mm, addr, pte);
+        if (!pte_none(page)) {
+                if (pte_present(page)) {
+                        unsigned long map_nr = pte_pagenr(page);
+                        if (map_nr < max_mapnr)
+                                __free_page(mem_map + map_nr);
+                } else {
+                        printk(KERN_CRIT
+                               "Whee.. Swapped out page in kernel page table\n");
+                }
+        }
+}
+#endif
+
+/* These two routines should probably check a few things... */
+static void set_uncached(pte_t * pte, unsigned long arg)
+{
+        pte_val(*pte) |= _PAGE_NO_CACHE;
+}
+
+static void set_cached(pte_t * pte, unsigned long arg)
+{
+        pte_val(*pte) &= ~_PAGE_NO_CACHE;
+}
+
+static inline void iterate_pte(pmd_t * pmd, unsigned long address,
+                               unsigned long size, pte_iterator_t op,
+                               unsigned long arg)
+{
+        pte_t *pte;
+        unsigned long end;
+
+        if (pmd_none(*pmd))
+                return;
+        if (pmd_bad(*pmd)) {
+                pmd_ERROR(*pmd);
+                pmd_clear(pmd);
+                return;
+        }
+        pte = pte_offset(pmd, address);
+        address &= ~PMD_MASK;
+        end = address + size;
+        if (end > PMD_SIZE)
+                end = PMD_SIZE;
+        do {
+                op(pte, arg);
+                address += PAGE_SIZE;
+                pte++;
+        } while (address < end);
+}
+
+static inline void iterate_pmd(pgd_t * dir, unsigned long address,
+                               unsigned long size, pte_iterator_t op,
+                               unsigned long arg)
+{
+        pmd_t *pmd;
+        unsigned long end;
+
+        if (pgd_none(*dir))
+                return;
+        if (pgd_bad(*dir)) {
+                pgd_ERROR(*dir);
+                pgd_clear(dir);
+                return;
+        }
+        pmd = pmd_offset(dir, address);
+        address &= ~PGDIR_MASK;
+        end = address + size;
+        if (end > PGDIR_SIZE)
+                end = PGDIR_SIZE;
+        do {
+                iterate_pte(pmd, address, end - address, op, arg);
+                address = (address + PMD_SIZE) & PMD_MASK;
+                pmd++;
+        } while (address < end);
+}
+
+static void iterate_pages(unsigned long address, unsigned long size,
+                          pte_iterator_t op, unsigned long arg)
+{
+        pgd_t *dir;
+        unsigned long end = address + size;
+
+        dir = pgd_offset_k(address);
+        flush_cache_all();
+        do {
+                iterate_pmd(dir, address, end - address, op, arg);
+                address = (address + PGDIR_SIZE) & PGDIR_MASK;
+                dir++;
+        } while (address && (address < end));
+        flush_tlb_all();
+}
+
+void
+kernel_set_cachemode(unsigned long vaddr, unsigned long size, int what)
+{
+        switch (what) {
+        case IOMAP_FULL_CACHING:
+                iterate_pages(vaddr, size, set_cached, 0);
+                flush_tlb_range(NULL, vaddr, size);
+                break;
+        case IOMAP_NOCACHE_SER:
+                iterate_pages(vaddr, size, set_uncached, 0);
+                flush_tlb_range(NULL, vaddr, size);
+                break;
+        default:
+                printk(KERN_CRIT
+                       "kernel_set_cachemode mode %d not understood\n",
+                       what);
+                break;
+        }
+}