00001 /* 00002 * Support for user to kernel-space feature. 00003 * 00004 * Original RTAI/x86 layer implementation: 00005 * Copyright (c) 2000 Paolo Mantegazza (mantegazza@aero.polimi.it) 00006 * Copyright (c) 2000 Steve Papacharalambous (stevep@zentropix.com) 00007 * Copyright (c) 2000 Stuart Hughes 00008 * and others. 00009 * 00010 * RTAI/x86 rewrite over Adeos: 00011 * Copyright (c) 2002 Philippe Gerum (rpm@xenomai.org) 00012 * 00013 * Original RTAI/ARM RTHAL implementation: 00014 * Copyright (c) 2000 Pierre Cloutier (pcloutier@poseidoncontrols.com) 00015 * Copyright (c) 2001 Alex Züpke, SYSGO RTS GmbH (azu@sysgo.de) 00016 * Copyright (c) 2002 Guennadi Liakhovetski DSA GmbH (gl@dsa-ac.de) 00017 * Copyright (c) 2002 Steve Papacharalambous (stevep@zentropix.com) 00018 * Copyright (c) 2002 Wolfgang Müller (wolfgang.mueller@dsa-ac.de) 00019 * Copyright (c) 2003 Bernard Haible, Marconi Communications 00020 * Copyright (c) 2003 Thomas Gleixner (tglx@linutronix.de) 00021 * Copyright (c) 2003 Philippe Gerum (rpm@xenomai.org) 00022 * 00023 * RTAI/ARM over Adeos rewrite: 00024 * Copyright (c) 2004-2005 Michael Neuhauser, Firmix Software GmbH (mike@firmix.at) 00025 * 00026 * RTAI/ARM over Adeos rewrite for PXA255_2.6.7: 00027 * Copyright (c) 2005 Stefano Gafforelli (stefano.gafforelli@tiscali.it) 00028 * Copyright (c) 2005 Luca Pizzi (lucapizzi@hotmail.com) 00029 * 00030 * This program is free software; you can redistribute it and/or modify it under 00031 * the terms of the GNU General Public License as published by the Free Software 00032 * Foundation, Inc., 675 Mass Ave, Cambridge MA 02139, USA; either version 2 of 00033 * the License, or (at your option) any later version. 00034 * 00035 * This program is distributed in the hope that it will be useful, but WITHOUT 00036 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 00037 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 00038 * details. 00039 * 00040 * You should have received a copy of the GNU General Public License along with 00041 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 00042 * Place - Suite 330, Boston, MA 02111-1307, USA. 00043 */ 00044 #ifndef _RTAI_ASM_ARM_VECTORS_H 00045 #define _RTAI_ASM_ARM_VECTORS_H 00046 00047 #include <rtai_config.h> 00048 00049 /* 00050 * ARM SWI assembler instructen = 8 bit SWI op-code + 24 bit info 00051 * 00052 * SWI info = 4 bit OS-number (Linux = 9) + 20 bit syscall number 00053 * 00054 * SWI info for Linux syscall: ..9x_xxxx (syscall number: 0_0000 - f_ffff) 00055 * 00056 * Linux syscall number range: ..90_0000 - ..9e_ffff 00057 * ARM private syscalls: ..9f_0000 - ..9f_ffef 00058 * RTAI syscalls: ..9f_fff0 - ..9f_ffff 00059 * 00060 * Old style "vectors" could be in least signigicant half-byte of SWI info (but 00061 * currently only one RTAI syscall is used ..9f_fff0). 00062 */ 00063 00064 #define RTAI_NUM_VECTORS 16 /* number of usable vectors */ 00065 #define RTAI_SWI_SCNO_MASK 0x00FFFFF0 00066 #define RTAI_SWI_VEC_MASK 0x0000000F 00067 00068 #define RTAI_SYS_VECTOR 0x0 /* only one used (-> LXRT requests and SRQs) */ 00069 #if 0 00070 /* shm not implemented yet (trouble with virtual addresses in cache) and when it 00071 * will be implemented it's unlikely that a seperate vector will be used) */ 00072 #define RTAI_SHM_VECTOR 0x2 00073 #endif 00074 00075 /* The "memory" clobber constraint is essential! It forces the compiler to not 00076 * cache in registers across this call (e.g. data that is written to a user 00077 * structure by the call might not be (re)read after the call without the 00078 * constraint. (glibc implements syscalls pretty much the same way) */ 00079 00080 #define _RTAI_DO_SWI(scno_magic, srq, parg) ({ \ 00081 union { \ 00082 long long ll; \ 00083 struct { \ 00084 unsigned long low; \ 00085 unsigned long high; \ 00086 } l; \ 00087 } _retval; \ 00088 { \ 00089 register int _r0 asm ("r0") = (int)(srq); \ 00090 register int _r1 asm ("r1") = (int)(parg); \ 00091 asm volatile("swi %[nr]" \ 00092 : "+r" (_r0), "+r" (_r1) \ 00093 : [nr] "i" (scno_magic) \ 00094 : "memory" \ 00095 ); \ 00096 _retval.l.low = _r0; \ 00097 _retval.l.high = _r1; \ 00098 } \ 00099 _retval.ll; \ 00100 }) 00101 00102 #ifdef CONFIG_ARCH_PXA 00103 # define RTAI_SWI_SCNO_MAGIC 0x00404404 00104 # define RTAI_DO_SWI(vector, srq, parg) _RTAI_DO_SWI(RTAI_SWI_SCNO_MAGIC, srq, parg) 00105 #else /* !CONFIG_ARCH_PXA */ 00106 # define RTAI_SWI_SCNO_MAGIC 0x009FFFF0 00107 # define RTAI_DO_SWI(vector, srq, parg) _RTAI_DO_SWI((RTAI_SWI_SCNO_MAGIC | ((vector) & RTAI_SWI_VEC_MASK)), srq, parg) 00108 #endif /* CONFIG_ARCH_PXA */ 00109 00110 #endif /* _RTAI_ASM_ARM_VECTORS_H */
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