Fixed MTP to work with TWRP

arch/mn10300/include/asm/highmem.h

@@ -0,0 +1,128 @@
+/* MN10300 Virtual kernel memory mappings for high memory
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * - Derived from include/asm-i386/highmem.h
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef _ASM_HIGHMEM_H
+#define _ASM_HIGHMEM_H
+
+#ifdef __KERNEL__
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/highmem.h>
+#include <asm/kmap_types.h>
+#include <asm/pgtable.h>
+
+/* undef for production */
+#undef HIGHMEM_DEBUG
+
+/* declarations for highmem.c */
+extern unsigned long highstart_pfn, highend_pfn;
+
+extern pte_t *kmap_pte;
+extern pgprot_t kmap_prot;
+extern pte_t *pkmap_page_table;
+
+extern void __init kmap_init(void);
+
+/*
+ * 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 PKMAP_BASE	0xfe000000UL
+#define LAST_PKMAP	1024
+#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 unsigned long kmap_high(struct page *page);
+extern void kunmap_high(struct page *page);
+
+static inline unsigned long kmap(struct page *page)
+{
+	if (in_interrupt())
+		BUG();
+	if (page < highmem_start_page)
+		return page_address(page);
+	return kmap_high(page);
+}
+
+static inline void kunmap(struct page *page)
+{
+	if (in_interrupt())
+		BUG();
+	if (page < highmem_start_page)
+		return;
+	kunmap_high(page);
+}
+
+/*
+ * 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.
+ */
+static inline void *kmap_atomic(struct page *page)
+{
+	unsigned long vaddr;
+	int idx, type;
+
+	pagefault_disable();
+	if (page < highmem_start_page)
+		return page_address(page);
+
+	type = kmap_atomic_idx_push();
+	idx = type + KM_TYPE_NR * smp_processor_id();
+	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+#if HIGHMEM_DEBUG
+	if (!pte_none(*(kmap_pte - idx)))
+		BUG();
+#endif
+	set_pte(kmap_pte - idx, mk_pte(page, kmap_prot));
+	local_flush_tlb_one(vaddr);
+
+	return (void *)vaddr;
+}
+
+static inline void __kunmap_atomic(unsigned long vaddr)
+{
+	int type;
+
+	if (vaddr < FIXADDR_START) { /* FIXME */
+		pagefault_enable();
+		return;
+	}
+
+	type = kmap_atomic_idx();
+
+#if HIGHMEM_DEBUG
+	{
+		unsigned int idx;
+		idx = type + KM_TYPE_NR * smp_processor_id();
+
+		if (vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx))
+			BUG();
+
+		/*
+		 * force other mappings to Oops if they'll try to access
+		 * this pte without first remap it
+		 */
+		pte_clear(kmap_pte - idx);
+		local_flush_tlb_one(vaddr);
+	}
+#endif
+
+	kmap_atomic_idx_pop();
+	pagefault_enable();
+}
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_HIGHMEM_H */