Merge branch 'linus' into x86/gart

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 0000000..cc7ef40
--- /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__ */