Linux-2.6.12-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, 137 insertions, 0 deletions

diff --git a/arch/sh/mm/pg-sh7705.c b/arch/sh/mm/pg-sh7705.c
new file mode 100644
index 0000000..ff9ece9
--- /dev/null
+++ b/arch/sh/mm/pg-sh7705.c
@@ -0,0 +1,137 @@
+/*
+ * arch/sh/mm/pg-sh7705.c
+ *
+ * Copyright (C) 1999, 2000  Niibe Yutaka
+ * Copyright (C) 2004  Alex Song
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/threads.h>
+#include <asm/addrspace.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/cache.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+static inline void __flush_purge_virtual_region(void *p1, void *virt, int size)
+{
+	unsigned long v;
+	unsigned long begin, end;
+	unsigned long p1_begin;
+
+
+	begin = L1_CACHE_ALIGN((unsigned long)virt);
+	end = L1_CACHE_ALIGN((unsigned long)virt + size);
+
+	p1_begin = (unsigned long)p1 & ~(L1_CACHE_BYTES - 1);
+
+	/* do this the slow way as we may not have TLB entries
+	 * for virt yet. */
+	for (v = begin; v < end; v += L1_CACHE_BYTES) {
+		unsigned long p;
+	        unsigned long ways, addr;
+
+		p = __pa(p1_begin);
+
+	        ways = cpu_data->dcache.ways;
+		addr = CACHE_OC_ADDRESS_ARRAY;
+
+		do {
+			unsigned long data;
+
+			addr |= (v & cpu_data->dcache.entry_mask);
+
+			data = ctrl_inl(addr);
+			if ((data & CACHE_PHYSADDR_MASK) ==
+			       (p & CACHE_PHYSADDR_MASK)) {
+				data &= ~(SH_CACHE_UPDATED|SH_CACHE_VALID);
+				ctrl_outl(data, addr);
+			}
+
+			addr += cpu_data->dcache.way_incr;
+		} while (--ways);
+
+		p1_begin += L1_CACHE_BYTES;
+	}
+}
+
+/*
+ * clear_user_page
+ * @to: P1 address
+ * @address: U0 address to be mapped
+ */
+void clear_user_page(void *to, unsigned long address, struct page *pg)
+{
+	struct page *page = virt_to_page(to);
+
+	__set_bit(PG_mapped, &page->flags);
+	if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
+		clear_page(to);
+		__flush_wback_region(to, PAGE_SIZE);
+	} else {
+		__flush_purge_virtual_region(to,
+					     (void *)(address & 0xfffff000),
+					     PAGE_SIZE);
+		clear_page(to);
+		__flush_wback_region(to, PAGE_SIZE);
+	}
+}
+
+/*
+ * copy_user_page
+ * @to: P1 address
+ * @from: P1 address
+ * @address: U0 address to be mapped
+ */
+void copy_user_page(void *to, void *from, unsigned long address, struct page *pg)
+{
+	struct page *page = virt_to_page(to);
+
+
+	__set_bit(PG_mapped, &page->flags);
+	if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
+		copy_page(to, from);
+		__flush_wback_region(to, PAGE_SIZE);
+	} else {
+		__flush_purge_virtual_region(to,
+					     (void *)(address & 0xfffff000),
+					     PAGE_SIZE);
+		copy_page(to, from);
+		__flush_wback_region(to, PAGE_SIZE);
+	}
+}
+
+/*
+ * For SH7705, we have our own implementation for ptep_get_and_clear
+ * Copied from pg-sh4.c
+ */
+inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	pte_t pte = *ptep;
+
+	pte_clear(mm, addr, ptep);
+	if (!pte_not_present(pte)) {
+		unsigned long pfn = pte_pfn(pte);
+		if (pfn_valid(pfn)) {
+			struct page *page = pfn_to_page(pfn);
+			struct address_space *mapping = page_mapping(page);
+			if (!mapping || !mapping_writably_mapped(mapping))
+				__clear_bit(PG_mapped, &page->flags);
+		}
+	}
+
+	return pte;
+}
+