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/* $NetBSD: pic_splfuncs.c,v 1.24 2022/06/25 13:24:35 jmcneill Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "opt_modular.h"
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.24 2022/06/25 13:24:35 jmcneill Exp $");
#define _INTR_PRIVATE
#include <sys/param.h>
#include <sys/atomic.h>
#include <sys/evcnt.h>
#include <sys/lwp.h>
#include <sys/kernel.h>
#include <dev/cons.h>
#include <arm/armreg.h>
#include <arm/cpu.h>
#include <arm/cpufunc.h>
#include <arm/locore.h> /* for compat aarch64 */
#include <arm/pic/picvar.h>
int
_splraise(int newipl)
{
struct cpu_info * const ci = curcpu();
const int oldipl = ci->ci_cpl;
KASSERT(newipl < NIPL);
if (newipl > ci->ci_cpl) {
pic_set_priority(ci, newipl);
}
return oldipl;
}
int
_spllower(int newipl)
{
struct cpu_info * const ci = curcpu();
const int oldipl = ci->ci_cpl;
KASSERT(panicstr || newipl <= ci->ci_cpl);
if (newipl < ci->ci_cpl) {
register_t psw = DISABLE_INTERRUPT_SAVE();
ci->ci_intr_depth++;
pic_do_pending_ints(psw, newipl, NULL);
ci->ci_intr_depth--;
if ((psw & I32_bit) == 0 || newipl == IPL_NONE)
ENABLE_INTERRUPT();
cpu_dosoftints();
}
return oldipl;
}
void
splx(int savedipl)
{
struct cpu_info * const ci = curcpu();
KASSERT(savedipl < NIPL);
if (__predict_false(savedipl == ci->ci_cpl)) {
return;
}
if (ci->ci_cpl >= IPL_VM) {
register_t psw = DISABLE_INTERRUPT_SAVE();
KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl,
"splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl);
ci->ci_intr_depth++;
pic_do_pending_ints(psw, savedipl, NULL);
ci->ci_intr_depth--;
KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
ci->ci_cpl, savedipl);
if ((psw & I32_bit) == 0)
ENABLE_INTERRUPT();
} else {
pic_set_priority(ci, savedipl);
}
cpu_dosoftints();
KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
ci->ci_cpl, savedipl);
}
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