a6c19dfe39
The core mm code will provide a default gate area based on FIXADDR_USER_START and FIXADDR_USER_END if !defined(__HAVE_ARCH_GATE_AREA) && defined(AT_SYSINFO_EHDR). This default is only useful for ia64. arm64, ppc, s390, sh, tile, 64-bit UML, and x86_32 have their own code just to disable it. arm, 32-bit UML, and x86_64 have gate areas, but they have their own implementations. This gets rid of the default and moves the code into ia64. This should save some code on architectures without a gate area: it's now possible to inline the gate_area functions in the default case. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Acked-by: Nathan Lynch <nathan_lynch@mentor.com> Acked-by: H. Peter Anvin <hpa@linux.intel.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [in principle] Acked-by: Richard Weinberger <richard@nod.at> [for um] Acked-by: Will Deacon <will.deacon@arm.com> [for arm64] Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Nathan Lynch <Nathan_Lynch@mentor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
45 lines
1 KiB
C
45 lines
1 KiB
C
#ifndef _ASM_X86_PAGE_64_H
|
|
#define _ASM_X86_PAGE_64_H
|
|
|
|
#include <asm/page_64_types.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/* duplicated to the one in bootmem.h */
|
|
extern unsigned long max_pfn;
|
|
extern unsigned long phys_base;
|
|
|
|
static inline unsigned long __phys_addr_nodebug(unsigned long x)
|
|
{
|
|
unsigned long y = x - __START_KERNEL_map;
|
|
|
|
/* use the carry flag to determine if x was < __START_KERNEL_map */
|
|
x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
|
|
|
|
return x;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_VIRTUAL
|
|
extern unsigned long __phys_addr(unsigned long);
|
|
extern unsigned long __phys_addr_symbol(unsigned long);
|
|
#else
|
|
#define __phys_addr(x) __phys_addr_nodebug(x)
|
|
#define __phys_addr_symbol(x) \
|
|
((unsigned long)(x) - __START_KERNEL_map + phys_base)
|
|
#endif
|
|
|
|
#define __phys_reloc_hide(x) (x)
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
#define pfn_valid(pfn) ((pfn) < max_pfn)
|
|
#endif
|
|
|
|
void clear_page(void *page);
|
|
void copy_page(void *to, void *from);
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#define __HAVE_ARCH_GATE_AREA 1
|
|
|
|
#endif /* _ASM_X86_PAGE_64_H */
|