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/*
* klibc/sysconfig.h
*
* Allows for definitions of some things which may be system-dependent
* NOTE: this file must not result in any output from the preprocessor.
*/
#ifndef _KLIBC_SYSCONFIG_H
#define _KLIBC_SYSCONFIG_H
#include <klibc/archconfig.h>
#include <asm/unistd.h>
/*
* These are the variables that can be defined in <klibc/archconfig.h>.
* For boolean options, #define to 0 to disable, #define to 1 to enable.
*
* If undefined, they will be given defaults here.
*/
/*
* _KLIBC_NO_MMU:
*
* Indicates this architecture doesn't have an MMU, and therefore
* does not have the sys_fork and sys_brk system calls.
*/
/* Default to having an MMU if we can find the fork system call */
#ifndef _KLIBC_NO_MMU
# if defined(__NR_fork)
# define _KLIBC_NO_MMU 0
# else
# define _KLIBC_NO_MMU 1
# endif
#endif
/*
* _KLIBC_REAL_VFORK:
*
* Indicates that this architecture has a real vfork() system call.
* This is the default if sys_vfork exists; if there is an
* architecture-dependent implementation of vfork(), define this
* symbol.
*/
#ifndef _KLIBC_REAL_VFORK
# if defined(__NR_vfork)
# define _KLIBC_REAL_VFORK 1
# else
# define _KLIBC_REAL_VFORK 0
# endif
#endif
/*
* _KLIBC_USE_MMAP2:
*
* Indicates that this architecture should use sys_mmap2 instead
* of sys_mmap. This is the default on 32-bit architectures, assuming
* sys_mmap2 exists.
*/
#ifndef _KLIBC_USE_MMAP2
# if (_BITSIZE == 32 && defined(__NR_mmap2)) || \
(_BITSIZE == 64 && !defined(__NR_mmap))
# define _KLIBC_USE_MMAP2 1
# else
# define _KLIBC_USE_MMAP2 0
# endif
#endif
/*
* _KLIBC_MMAP2_SHIFT:
*
* Indicate the shift of the offset parameter in sys_mmap2.
* On most architectures, this is always 12, but on some
* architectures it can be a different number, or the current
* page size. If this is dependent on the page size, define
* this to an expression which includes __getpageshift().
*/
#ifndef _KLIBC_MMAP2_SHIFT
# define _KLIBC_MMAP2_SHIFT 12
#endif
/*
* _KLIBC_MALLOC_USES_SBRK:
*
* Indicates that malloc() should use sbrk() to obtain raw memory
* from the system, rather than mmap().
*/
/* Default to get memory using mmap() */
#ifndef _KLIBC_MALLOC_USES_SBRK
# define _KLIBC_MALLOC_USES_SBRK 0
#endif
/*
* _KLIBC_MALLOC_CHUNK_SIZE:
* This is the minimum chunk size we will ask the kernel for using
* malloc(); this should be a multiple of the page size and must
* be a power of 2.
*/
#ifndef _KLIBC_MALLOC_CHUNK_SIZE
# define _KLIBC_MALLOC_CHUNK_SIZE 65536
#endif
/*
* _KLIBC_BUFSIZ:
* This is the size of an stdio buffer. By default this is
* _KLIBC_MALLOC_CHUNK_SIZE/4, which allows the three standard
* streams to fit inside a malloc chunk.
*/
#ifndef _KLIBC_BUFSIZ
# define _KLIBC_BUFSIZ (_KLIBC_MALLOC_CHUNK_SIZE >> 2)
#endif
/*
* _KLIBC_SBRK_ALIGNMENT:
*
* This is the minimum alignment for the memory returned by
* sbrk(). It must be a power of 2. If _KLIBC_MALLOC_USES_SBRK
* is set it should be no smaller than the size of struct
* arena_header in malloc.h (== 4 pointers.)
*/
#ifndef _KLIBC_SBRK_ALIGNMENT
# define _KLIBC_SBRK_ALIGNMENT 32
#endif
/*
* _KLIBC_NEEDS_SA_RESTORER:
*
* Some architectures, like x86-64 and some i386 Fedora kernels,
* do not provide a default sigreturn, and therefore must have
* SA_RESTORER set. On others, the default sigreturn requires an
* executable stack, which we should avoid.
*/
#ifndef _KLIBC_NEEDS_SA_RESTORER
# define _KLIBC_NEEDS_SA_RESTORER 0
#endif
/*
* _KLIBC_NEEDS_SA_SIGINFO:
*
* On some architectures, the signal stack frame is set up for
* either sigreturn() or rt_sigreturn() depending on whether
* SA_SIGINFO is set. Where this is the case, and we provide our
* own restorer function, this must also be set so that the
* restorer can always use rt_sigreturn().
*/
#ifndef _KLIBC_NEEDS_SA_SIGINFO
# define _KLIBC_NEEDS_SA_SIGINFO 0
#endif
/*
* _KLIBC_NEEDS_SIGACTION_FIXUP
*
* On some architectures, struct sigaction needs additional
* changes before passing to the kernel.
*/
#ifndef _KLIBC_NEEDS_SIGACTION_FIXUP
# define _KLIBC_NEEDS_SIGACTION_FIXUP 0
#endif
/*
* _KLIBC_STATFS_F_TYPE_64:
*
* This indicates that the f_type, f_bsize, f_namelen,
* f_frsize, and f_spare fields of struct statfs are
* 64 bits long. This is normally the case for 64-bit
* platforms, and so is the default for those. See
* usr/include/sys/vfs.h for the exact details.
*/
#ifndef _KLIBC_STATFS_F_TYPE_64
# define _KLIBC_STATFS_F_TYPE_64 (_BITSIZE == 64)
#endif
/*
* _KLIBC_STATFS_F_TYPE_32B:
*
* mips has it's own definition of statfs, which is
* different from any other 32 bit arch.
*/
#ifndef _KLIBC_STATFS_F_TYPE_32B
# define _KLIBC_STATFS_F_TYPE_32B 0
#endif
/*
* _KLIBC_HAS_ARCHSOCKET_H
*
* This architecture has <klibc/archsocket.h>
*/
#ifndef _KLIBC_HAS_ARCHSOCKET_H
# define _KLIBC_HAS_ARCHSOCKET_H 0
#endif
/*
* _KLIBC_SYS_SOCKETCALL
*
* This architecture (e.g. SPARC) advertises socket-related
* system calls, which are not actually implemented. Use
* socketcalls unconditionally instead.
*/
#ifndef _KLIBC_SYS_SOCKETCALL
# define _KLIBC_SYS_SOCKETCALL 0
#endif
/*
* _KLIBC_ARM_USE_BX
*
* This arm architecture supports bx instruction.
*/
#ifndef _KLIBC_ARM_USE_BX
# define _KLIBC_ARM_USE_BX 0
#endif
/*
* _KLIBC_HAS_ARCHINIT
*
* This architecture has klibc/archinit.h and __libc_archinit()
*/
#ifndef _KLIBC_HAS_ARCHINIT
# define _KLIBC_HAS_ARCHINIT 0
#endif
#endif /* _KLIBC_SYSCONFIG_H */
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