diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2013-01-18 15:12:17 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-02-11 20:00:34 +0530 |
| commit | 3be80aaef861a60b85a9323462ebb5f623774f7a (patch) | |
| tree | b5224ff6c43f4a5787b72a18b83b6d4de7dbddf7 /arch/arc/include/asm/page.h | |
| parent | ca15c8ecd588dda4377d18d6d27bc1e87b4177cb (diff) | |
ARC: Fundamental ARCH data-types/defines
* L1_CACHE_SHIFT
* PAGE_SIZE, PAGE_OFFSET
* struct pt_regs, struct user_regs_struct
* struct thread_struct, cpu_relax(), task_pt_regs(), start_thread(), ...
* struct thread_info, THREAD_SIZE, INIT_THREAD_INFO(), TIF_*, ...
* BUG()
* ELF_*
* Elf_*
To disallow user-space visibility into some of the core kernel data-types
such as struct pt_regs, #ifdef __KERNEL__ which also makes the UAPI header
spit (further patch in the series) to NOT export it to asm/uapi/ptrace.h
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Jonas Bonn <jonas.bonn@gmail.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arc/include/asm/page.h')
| -rw-r--r-- | arch/arc/include/asm/page.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/arc/include/asm/page.h b/arch/arc/include/asm/page.h new file mode 100644 index 000000000000..7cd1224d8e7d --- /dev/null +++ b/arch/arc/include/asm/page.h @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 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_ARC_PAGE_H +#define __ASM_ARC_PAGE_H + +/* PAGE_SHIFT determines the page size */ +#if defined(CONFIG_ARC_PAGE_SIZE_16K) +#define PAGE_SHIFT 14 +#elif defined(CONFIG_ARC_PAGE_SIZE_4K) +#define PAGE_SHIFT 12 +#else +/* + * Default 8k + * done this way (instead of under CONFIG_ARC_PAGE_SIZE_8K) because adhoc + * user code (busybox appletlib.h) expects PAGE_SHIFT to be defined w/o + * using the correct uClibc header and in their build our autoconf.h is + * not available + */ +#define PAGE_SHIFT 13 +#endif + +#ifdef __ASSEMBLY__ +#define PAGE_SIZE (1 << PAGE_SHIFT) +#define PAGE_OFFSET (0x80000000) +#else +#define PAGE_SIZE (1UL << PAGE_SHIFT) /* Default 8K */ +#define PAGE_OFFSET (0x80000000UL) /* Kernel starts at 2G onwards */ +#endif + +#define PAGE_MASK (~(PAGE_SIZE-1)) + +#endif /* !__ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif |