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sys_machdep.c revision 1.11 
      1 /*	$NetBSD: sys_machdep.c,v 1.11 2010/07/07 01:20:49 chs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995-1997 Mark Brinicombe.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Mark Brinicombe
     18  * 4. The name of the company nor the name of the author may be used to
     19  *    endorse or promote products derived from this software without specific
     20  *    prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  * RiscBSD kernel project
     35  *
     36  * sys_machdep.c
     37  *
     38  * Machine dependant syscalls
     39  *
     40  * Created      : 10/01/96
     41  */
     42 
     43 #include <sys/cdefs.h>
     44 __KERNEL_RCSID(0, "$NetBSD: sys_machdep.c,v 1.11 2010/07/07 01:20:49 chs Exp $");
     45 
     46 #include <sys/param.h>
     47 #include <sys/systm.h>
     48 #include <sys/proc.h>
     49 #include <sys/mbuf.h>
     50 #include <sys/mount.h>
     51 #include <sys/cpu.h>
     52 #include <uvm/uvm_extern.h>
     53 #include <sys/sysctl.h>
     54 #include <sys/syscallargs.h>
     55 
     56 #include <machine/sysarch.h>
     57 
     58 /* Prototypes */
     59 static int arm32_sync_icache(struct lwp *, const void *, register_t *);
     60 static int arm32_drain_writebuf(struct lwp *, const void *, register_t *);
     61 
     62 static int
     63 arm32_sync_icache(struct lwp *l, const void *args, register_t *retval)
     64 {
     65 	struct arm_sync_icache_args ua;
     66 	int error;
     67 
     68 	if ((error = copyin(args, &ua, sizeof(ua))) != 0)
     69 		return (error);
     70 
     71 	pmap_icache_sync_range(vm_map_pmap(&l->l_proc->p_vmspace->vm_map),
     72 	    ua.addr, ua.addr + ua.len);
     73 
     74 	*retval = 0;
     75 	return(0);
     76 }
     77 
     78 static int
     79 arm32_drain_writebuf(struct lwp *l, const void *args, register_t *retval)
     80 {
     81 	/* No args. */
     82 
     83 	cpu_drain_writebuf();
     84 
     85 	*retval = 0;
     86 	return(0);
     87 }
     88 
     89 int
     90 sys_sysarch(struct lwp *l, const struct sys_sysarch_args *uap, register_t *retval)
     91 {
     92 	/* {
     93 		syscallarg(int) op;
     94 		syscallarg(void *) parms;
     95 	} */
     96 	int error = 0;
     97 
     98 	switch(SCARG(uap, op)) {
     99 	case ARM_SYNC_ICACHE :
    100 		error = arm32_sync_icache(l, SCARG(uap, parms), retval);
    101 		break;
    102 
    103 	case ARM_DRAIN_WRITEBUF :
    104 		error = arm32_drain_writebuf(l, SCARG(uap, parms), retval);
    105 		break;
    106 
    107 	default:
    108 		error = EINVAL;
    109 		break;
    110 	}
    111 	return (error);
    112 }
    113 
    114 int
    115 cpu_lwp_setprivate(lwp_t *l, void *addr)
    116 {
    117 #ifdef _ARM_ARCH_6
    118 	struct pcb *pcb;
    119 
    120 	pcb = lwp_getpcb(l);
    121 	kpreempt_disable();
    122 	pcb->pcb_un.un_32.pcb32_user_pid_ro = (u_int)addr;
    123 	if (l == curlwp)
    124 		__asm("mcr p15, 0, %0, c13, c0, 3" : : "r" (addr));
    125 	kpreempt_enable();
    126 	return 0;
    127 #else
    128 	return ENOSYS;
    129 #endif
    130 }
    131