1 files changed, 58 insertions, 0 deletions
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
new file mode 100644
index 000000000..bcfb63710
--- /dev/null
+++ b/arch/s390/include/asm/mmu.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __MMU_H
+#define __MMU_H
+
+#include <linux/cpumask.h>
+#include <linux/errno.h>
+
+typedef struct {
+	spinlock_t lock;
+	cpumask_t cpu_attach_mask;
+	atomic_t flush_count;
+	unsigned int flush_mm;
+	struct list_head pgtable_list;
+	struct list_head gmap_list;
+	unsigned long gmap_asce;
+	unsigned long asce;
+	unsigned long asce_limit;
+	unsigned long vdso_base;
+	/*
+	 * The following bitfields need a down_write on the mm
+	 * semaphore when they are written to. As they are only
+	 * written once, they can be read without a lock.
+	 *
+	 * The mmu context allocates 4K page tables.
+	 */
+	unsigned int alloc_pgste:1;
+	/* The mmu context uses extended page tables. */
+	unsigned int has_pgste:1;
+	/* The mmu context uses storage keys. */
+	unsigned int uses_skeys:1;
+	/* The mmu context uses CMM. */
+	unsigned int uses_cmm:1;
+	/* The gmaps associated with this context are allowed to use huge pages. */
+	unsigned int allow_gmap_hpage_1m:1;
+	/* The mmu context is for compat task */
+	unsigned int compat_mm:1;
+} mm_context_t;
+
+#define INIT_MM_CONTEXT(name)						   \
+	.context.lock =	__SPIN_LOCK_UNLOCKED(name.context.lock),	   \
+	.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
+	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
+
+static inline int tprot(unsigned long addr)
+{
+	int rc = -EFAULT;
+
+	asm volatile(
+		"	tprot	0(%1),0\n"
+		"0:	ipm	%0\n"
+		"	srl	%0,28\n"
+		"1:\n"
+		EX_TABLE(0b,1b)
+		: "+d" (rc) : "a" (addr) : "cc");
+	return rc;
+}
+
+#endif