patch-2.4.4 linux/include/asm-arm/proc-armv/pgalloc.h

• Lines: 59
• Date: Thu Apr 12 12:20:31 2001
• Orig file: v2.4.3/linux/include/asm-arm/proc-armv/pgalloc.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/include/asm-arm/proc-armv/pgalloc.h linux/include/asm-arm/proc-armv/pgalloc.h
@@ -0,0 +1,58 @@
+/*
+ *  linux/include/asm-arm/proc-armv/pgalloc.h
+ *
+ *  Copyright (C) 2001 Russell King
+ *
+ * Page table allocation/freeing primitives for 32-bit ARM processors.
+ */
+
+/* unfortunately, this includes linux/mm.h and the rest of the universe. */
+#include <linux/slab.h>
+
+extern kmem_cache_t *pte_cache;
+
+/*
+ * Allocate one PTE table.
+ *
+ * Note that we keep the processor copy of the PTE entries separate
+ * from the Linux copy.  The processor copies are offset by -PTRS_PER_PTE
+ * words from the Linux copy.
+ */
+static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+	pte_t *pte;
+
+	pte = kmem_cache_alloc(pte_cache, GFP_KERNEL);
+	if (pte)
+		pte += PTRS_PER_PTE;
+	return pte;
+}
+
+/*
+ * Free one PTE table.
+ */
+static inline void pte_free_slow(pte_t *pte)
+{
+	if (pte) {
+		pte -= PTRS_PER_PTE;
+		kmem_cache_free(pte_cache, pte);
+	}
+}
+
+/*
+ * Populate the pmdp entry with a pointer to the pte.  This pmd is part
+ * of the mm address space.
+ *
+ * If 'mm' is the init tasks mm, then we are doing a vmalloc, and we
+ * need to set stuff up correctly for it.
+ */
+#define pmd_populate(mm,pmdp,pte)			\
+	do {						\
+		unsigned long __prot;			\
+		if (mm == &init_mm)			\
+			__prot = _PAGE_KERNEL_TABLE;	\
+		else					\
+			__prot = _PAGE_USER_TABLE;	\
+		set_pmd(pmdp, __mk_pmd(pte, __prot));	\
+	} while (0)
+