diff options
Diffstat (limited to 'arch/arc/include')
-rw-r--r-- | arch/arc/include/asm/highmem.h | 61 | ||||
-rw-r--r-- | arch/arc/include/asm/kmap_types.h | 18 | ||||
-rw-r--r-- | arch/arc/include/asm/processor.h | 7 |
3 files changed, 85 insertions, 1 deletions
diff --git a/arch/arc/include/asm/highmem.h b/arch/arc/include/asm/highmem.h new file mode 100644 index 0000000..b1585c9 --- /dev/null +++ b/arch/arc/include/asm/highmem.h @@ -0,0 +1,61 @@ +/* + * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com) + * + * 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_HIGHMEM_H +#define _ASM_HIGHMEM_H + +#ifdef CONFIG_HIGHMEM + +#include <uapi/asm/page.h> +#include <asm/kmap_types.h> + +/* start after vmalloc area */ +#define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE) +#define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */ +#define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS) +#define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT)) + +/* start after fixmap area */ +#define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE) +#define PKMAP_SIZE PGDIR_SIZE +#define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT) +#define LAST_PKMAP_MASK (LAST_PKMAP - 1) +#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) +#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) + +#define kmap_prot PAGE_KERNEL + + +#include <asm/cacheflush.h> + +extern void *kmap(struct page *page); +extern void *kmap_high(struct page *page); +extern void *kmap_atomic(struct page *page); +extern void __kunmap_atomic(void *kvaddr); +extern void kunmap_high(struct page *page); + +extern void kmap_init(void); + +static inline void flush_cache_kmaps(void) +{ + flush_cache_all(); +} + +static inline void kunmap(struct page *page) +{ + BUG_ON(in_interrupt()); + if (!PageHighMem(page)) + return; + kunmap_high(page); +} + + +#endif + +#endif diff --git a/arch/arc/include/asm/kmap_types.h b/arch/arc/include/asm/kmap_types.h new file mode 100644 index 0000000..f0d7f6a --- /dev/null +++ b/arch/arc/include/asm/kmap_types.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com) + * + * 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_KMAP_TYPES_H +#define _ASM_KMAP_TYPES_H + +/* + * We primarily need to define KM_TYPE_NR here but that in turn + * is a function of PGDIR_SIZE etc. + * To avoid circular deps issue, put everything in asm/highmem.h + */ +#endif diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h index ee682d8..4454535 100644 --- a/arch/arc/include/asm/processor.h +++ b/arch/arc/include/asm/processor.h @@ -114,7 +114,12 @@ extern unsigned int get_wchan(struct task_struct *p); * ----------------------------------------------------------------------------- */ #define VMALLOC_START 0x70000000 -#define VMALLOC_SIZE (PAGE_OFFSET - VMALLOC_START) + +/* + * 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter + * See asm/highmem.h for details + */ +#define VMALLOC_SIZE (PAGE_OFFSET - VMALLOC_START - PGDIR_SIZE * 4) #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) #define USER_KERNEL_GUTTER 0x10000000 |