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-rw-r--r--arch/parisc/mm/kmap.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/parisc/mm/kmap.c b/arch/parisc/mm/kmap.c
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+++ b/arch/parisc/mm/kmap.c
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+/*
+ * 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;
+ }
+}