unicore32 core architecture: mm related: generic codes

This patch includes generic codes for memory management.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/unicore32/mm/mm.h b/arch/unicore32/mm/mm.h
new file mode 100644
index 000000000000..3296bca0f1f7
--- /dev/null
+++ b/arch/unicore32/mm/mm.h
@@ -0,0 +1,39 @@
+/*
+ * linux/arch/unicore32/mm/mm.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+/* the upper-most page table pointer */
+extern pmd_t *top_pmd;
+extern int sysctl_overcommit_memory;
+
+#define TOP_PTE(x)	pte_offset_kernel(top_pmd, x)
+
+static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt)
+{
+	return pmd_offset((pud_t *)pgd, virt);
+}
+
+static inline pmd_t *pmd_off_k(unsigned long virt)
+{
+	return pmd_off(pgd_offset_k(virt), virt);
+}
+
+struct mem_type {
+	unsigned int prot_pte;
+	unsigned int prot_l1;
+	unsigned int prot_sect;
+};
+
+const struct mem_type *get_mem_type(unsigned int type);
+
+extern void __flush_dcache_page(struct address_space *, struct page *);
+
+void __init bootmem_init(void);
+void uc32_mm_memblock_reserve(void);