Initial import

1 files changed, 151 insertions, 0 deletions

diff --git a/arch/frv/include/asm/highmem.h b/arch/frv/include/asm/highmem.h
new file mode 100644
index 000000000..b3adc9361
--- /dev/null
+++ b/arch/frv/include/asm/highmem.h
@@ -0,0 +1,151 @@
+/* highmem.h: virtual kernel memory mappings for high memory
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * - Derived from include/asm-i386/highmem.h
+ *
+ * See Documentation/frv/mmu-layout.txt for more information.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _ASM_HIGHMEM_H
+#define _ASM_HIGHMEM_H
+
+#ifdef __KERNEL__
+
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <asm/mem-layout.h>
+#include <asm/spr-regs.h>
+#include <asm/mb-regs.h>
+
+#define NR_TLB_LINES		64	/* number of lines in the TLB */
+
+#ifndef __ASSEMBLY__
+
+#include <linux/interrupt.h>
+#include <asm/kmap_types.h>
+#include <asm/pgtable.h>
+
+#ifdef CONFIG_DEBUG_HIGHMEM
+#define HIGHMEM_DEBUG 1
+#else
+#define HIGHMEM_DEBUG 0
+#endif
+
+/* declarations for highmem.c */
+extern unsigned long highstart_pfn, highend_pfn;
+
+#define kmap_prot PAGE_KERNEL
+#define kmap_pte ______kmap_pte_in_TLB
+extern pte_t *pkmap_page_table;
+
+#define flush_cache_kmaps()  do { } while (0)
+
+/*
+ * Right now we initialize only a single pte table. It can be extended
+ * easily, subsequent pte tables have to be allocated in one physical
+ * chunk of RAM.
+ */
+#define LAST_PKMAP	PTRS_PER_PTE
+#define LAST_PKMAP_MASK	(LAST_PKMAP - 1)
+#define PKMAP_NR(virt)	((virt - PKMAP_BASE) >> PAGE_SHIFT)
+#define PKMAP_ADDR(nr)	(PKMAP_BASE + ((nr) << PAGE_SHIFT))
+
+extern void *kmap_high(struct page *page);
+extern void kunmap_high(struct page *page);
+
+extern void *kmap(struct page *page);
+extern void kunmap(struct page *page);
+
+extern struct page *kmap_atomic_to_page(void *ptr);
+
+#endif /* !__ASSEMBLY__ */
+
+/*
+ * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
+ * gives a more generic (and caching) interface. But kmap_atomic can
+ * be used in IRQ contexts, so in some (very limited) cases we need
+ * it.
+ */
+#define KMAP_ATOMIC_CACHE_DAMR		8
+
+#ifndef __ASSEMBLY__
+
+#define __kmap_atomic_primary(cached, paddr, ampr)						\
+({												\
+	unsigned long damlr, dampr;								\
+												\
+	dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V;		\
+												\
+	if (!cached)										\
+		asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory");			\
+	else											\
+		/* cache flush page attachment point */						\
+		asm volatile("movgs %0,iampr"#ampr"\n"						\
+			     "movgs %0,dampr"#ampr"\n"						\
+			     :: "r"(dampr) : "memory"						\
+			     );									\
+												\
+	asm("movsg damlr"#ampr",%0" : "=r"(damlr));						\
+												\
+	/*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/		\
+												\
+	(void *) damlr;										\
+})
+
+#define __kmap_atomic_secondary(slot, paddr)							  \
+({												  \
+	unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE;			  \
+	unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
+												  \
+	asm volatile("movgs %0,tplr \n"								  \
+		     "movgs %1,tppr \n"								  \
+		     "tlbpr %0,gr0,#2,#1"							  \
+		     : : "r"(damlr), "r"(dampr) : "memory");					  \
+												  \
+	/*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/			  \
+												  \
+	(void *) damlr;										  \
+})
+
+static inline void *kmap_atomic_primary(struct page *page)
+{
+	unsigned long paddr;
+
+	pagefault_disable();
+	paddr = page_to_phys(page);
+
+        return __kmap_atomic_primary(1, paddr, 2);
+}
+
+#define __kunmap_atomic_primary(cached, ampr)				\
+do {									\
+	asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory");		\
+	if (cached)							\
+		asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory");	\
+} while(0)
+
+#define __kunmap_atomic_secondary(slot, vaddr)				\
+do {									\
+	asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory");	\
+} while(0)
+
+static inline void kunmap_atomic_primary(void *kvaddr)
+{
+        __kunmap_atomic_primary(1, 2);
+	pagefault_enable();
+}
+
+void *kmap_atomic(struct page *page);
+void __kunmap_atomic(void *kvaddr);
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_HIGHMEM_H */