1 files changed, 78 insertions, 0 deletions

diff --git a/arch/arm/include/asm/domain.h b/arch/arm/include/asm/domain.h
new file mode 100644
index 000000000000..cc7ef4080711
--- /dev/null
+++ b/arch/arm/include/asm/domain.h
@@ -0,0 +1,78 @@
+/*
+ *  arch/arm/include/asm/domain.h
+ *
+ *  Copyright (C) 1999 Russell King.
+ *
+ * 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.
+ */
+#ifndef __ASM_PROC_DOMAIN_H
+#define __ASM_PROC_DOMAIN_H
+
+/*
+ * Domain numbers
+ *
+ *  DOMAIN_IO     - domain 2 includes all IO only
+ *  DOMAIN_USER   - domain 1 includes all user memory only
+ *  DOMAIN_KERNEL - domain 0 includes all kernel memory only
+ *
+ * The domain numbering depends on whether we support 36 physical
+ * address for I/O or not.  Addresses above the 32 bit boundary can
+ * only be mapped using supersections and supersections can only
+ * be set for domain 0.  We could just default to DOMAIN_IO as zero,
+ * but there may be systems with supersection support and no 36-bit
+ * addressing.  In such cases, we want to map system memory with
+ * supersections to reduce TLB misses and footprint.
+ *
+ * 36-bit addressing and supersections are only available on
+ * CPUs based on ARMv6+ or the Intel XSC3 core.
+ */
+#ifndef CONFIG_IO_36
+#define DOMAIN_KERNEL   0
+#define DOMAIN_TABLE    0
+#define DOMAIN_USER     1
+#define DOMAIN_IO       2
+#else
+#define DOMAIN_KERNEL   2
+#define DOMAIN_TABLE    2
+#define DOMAIN_USER     1
+#define DOMAIN_IO       0
+#endif
+
+/*
+ * Domain types
+ */
+#define DOMAIN_NOACCESS 0
+#define DOMAIN_CLIENT   1
+#define DOMAIN_MANAGER  3
+
+#define domain_val(dom,type)    ((type) << (2*(dom)))
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_MMU
+#define set_domain(x)                                   \
+        do {                                            \
+        __asm__ __volatile__(                           \
+        "mcr    p15, 0, %0, c3, c0      @ set domain"   \
+          : : "r" (x));                                 \
+        isb();                                          \
+        } while (0)
+
+#define modify_domain(dom,type)                                 \
+        do {                                                    \
+        struct thread_info *thread = current_thread_info();     \
+        unsigned int domain = thread->cpu_domain;               \
+        domain &= ~domain_val(dom, DOMAIN_MANAGER);             \
+        thread->cpu_domain = domain | domain_val(dom, type);    \
+        set_domain(thread->cpu_domain);                         \
+        } while (0)
+
+#else
+#define set_domain(x)           do { } while (0)
+#define modify_domain(dom,type) do { } while (0)
+#endif
+
+#endif
+#endif /* !__ASSEMBLY__ */