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      1 /*	$NetBSD: pic_splfuncs.c,v 1.24 2022/06/25 13:24:35 jmcneill Exp $	*/
      2 /*-
      3  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Matt Thomas.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "opt_modular.h"
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.24 2022/06/25 13:24:35 jmcneill Exp $");
     35 
     36 #define _INTR_PRIVATE
     37 #include <sys/param.h>
     38 #include <sys/atomic.h>
     39 #include <sys/evcnt.h>
     40 #include <sys/lwp.h>
     41 #include <sys/kernel.h>
     42 
     43 #include <dev/cons.h>
     44 
     45 #include <arm/armreg.h>
     46 #include <arm/cpu.h>
     47 #include <arm/cpufunc.h>
     48 #include <arm/locore.h>	/* for compat aarch64 */
     49 
     50 #include <arm/pic/picvar.h>
     51 
     52 int
     53 _splraise(int newipl)
     54 {
     55 	struct cpu_info * const ci = curcpu();
     56 	const int oldipl = ci->ci_cpl;
     57 	KASSERT(newipl < NIPL);
     58 	if (newipl > ci->ci_cpl) {
     59 		pic_set_priority(ci, newipl);
     60 	}
     61 	return oldipl;
     62 }
     63 
     64 int
     65 _spllower(int newipl)
     66 {
     67 	struct cpu_info * const ci = curcpu();
     68 	const int oldipl = ci->ci_cpl;
     69 	KASSERT(panicstr || newipl <= ci->ci_cpl);
     70 	if (newipl < ci->ci_cpl) {
     71 		register_t psw = DISABLE_INTERRUPT_SAVE();
     72 		ci->ci_intr_depth++;
     73 		pic_do_pending_ints(psw, newipl, NULL);
     74 		ci->ci_intr_depth--;
     75 		if ((psw & I32_bit) == 0 || newipl == IPL_NONE)
     76 			ENABLE_INTERRUPT();
     77 		cpu_dosoftints();
     78 	}
     79 	return oldipl;
     80 }
     81 
     82 void
     83 splx(int savedipl)
     84 {
     85 	struct cpu_info * const ci = curcpu();
     86 	KASSERT(savedipl < NIPL);
     87 
     88 	if (__predict_false(savedipl == ci->ci_cpl)) {
     89 		return;
     90 	}
     91 
     92 	if (ci->ci_cpl >= IPL_VM) {
     93 		register_t psw = DISABLE_INTERRUPT_SAVE();
     94 		KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl,
     95 		    "splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl);
     96 
     97 		ci->ci_intr_depth++;
     98 		pic_do_pending_ints(psw, savedipl, NULL);
     99 		ci->ci_intr_depth--;
    100 		KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
    101 		    ci->ci_cpl, savedipl);
    102 		if ((psw & I32_bit) == 0)
    103 			ENABLE_INTERRUPT();
    104 	} else {
    105 		pic_set_priority(ci, savedipl);
    106 	}
    107 
    108 	cpu_dosoftints();
    109 	KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
    110 	    ci->ci_cpl, savedipl);
    111 }
    112