b920de1b77
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/* MN10300 Virtual kernel memory mappings for high memory
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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* - Derived from include/asm-i386/highmem.h
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_HIGHMEM_H
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#define _ASM_HIGHMEM_H
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#ifdef __KERNEL__
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/kmap_types.h>
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#include <asm/pgtable.h>
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/* undef for production */
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#undef HIGHMEM_DEBUG
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/* declarations for highmem.c */
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extern unsigned long highstart_pfn, highend_pfn;
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extern pte_t *kmap_pte;
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extern pgprot_t kmap_prot;
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extern pte_t *pkmap_page_table;
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extern void __init kmap_init(void);
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/*
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* Right now we initialize only a single pte table. It can be extended
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* easily, subsequent pte tables have to be allocated in one physical
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* chunk of RAM.
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*/
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#define PKMAP_BASE 0xfe000000UL
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#define LAST_PKMAP 1024
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#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
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#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
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#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
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extern unsigned long __fastcall kmap_high(struct page *page);
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extern void __fastcall kunmap_high(struct page *page);
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static inline unsigned long kmap(struct page *page)
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{
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if (in_interrupt())
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BUG();
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if (page < highmem_start_page)
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return page_address(page);
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return kmap_high(page);
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}
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static inline void kunmap(struct page *page)
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{
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if (in_interrupt())
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BUG();
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if (page < highmem_start_page)
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return;
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kunmap_high(page);
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}
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/*
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* The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
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* gives a more generic (and caching) interface. But kmap_atomic can
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* be used in IRQ contexts, so in some (very limited) cases we need
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* it.
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*/
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static inline unsigned long kmap_atomic(struct page *page, enum km_type type)
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{
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enum fixed_addresses idx;
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unsigned long vaddr;
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if (page < highmem_start_page)
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return page_address(page);
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idx = type + KM_TYPE_NR * smp_processor_id();
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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#if HIGHMEM_DEBUG
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if (!pte_none(*(kmap_pte - idx)))
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BUG();
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#endif
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set_pte(kmap_pte - idx, mk_pte(page, kmap_prot));
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__flush_tlb_one(vaddr);
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return vaddr;
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}
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static inline void kunmap_atomic(unsigned long vaddr, enum km_type type)
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{
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#if HIGHMEM_DEBUG
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enum fixed_addresses idx = type + KM_TYPE_NR * smp_processor_id();
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if (vaddr < FIXADDR_START) /* FIXME */
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return;
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if (vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx))
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BUG();
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/*
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* force other mappings to Oops if they'll try to access
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* this pte without first remap it
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*/
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pte_clear(kmap_pte - idx);
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__flush_tlb_one(vaddr);
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#endif
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_HIGHMEM_H */
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