Module Name: src
Committed By: matt
Date: Fri Feb 5 07:36:51 UTC 2010
Modified Files:
src/sys/arch/mips/conf [matt-nb5-mips64]: files.mips
src/sys/arch/mips/include [matt-nb5-mips64]: cpu.h cpuregs.h locore.h
mips_param.h types.h
src/sys/arch/mips/mips [matt-nb5-mips64]: genassym.cf locore.S
vm_machdep.c
Added Files:
src/sys/arch/mips/mips [matt-nb5-mips64]: mips_softint.c
Removed Files:
src/sys/arch/mips/mips [matt-nb5-mips64]: softintr.c
Log Message:
Add __HAVE_FAST_SOFTINTS support.
Add routine to remap an uarea via a direct-mapped address. This avoids
TLB machinations when swtching to/from the softint thread. This can only
be done for lwp which won't exit.
To generate a diff of this commit:
cvs rdiff -u -r1.58.24.6 -r1.58.24.7 src/sys/arch/mips/conf/files.mips
cvs rdiff -u -r1.90.16.17 -r1.90.16.18 src/sys/arch/mips/include/cpu.h
cvs rdiff -u -r1.74.28.13 -r1.74.28.14 src/sys/arch/mips/include/cpuregs.h
cvs rdiff -u -r1.78.36.1.2.11 -r1.78.36.1.2.12 \
src/sys/arch/mips/include/locore.h
cvs rdiff -u -r1.23.78.4 -r1.23.78.5 src/sys/arch/mips/include/mips_param.h
cvs rdiff -u -r1.43.36.12 -r1.43.36.13 src/sys/arch/mips/include/types.h
cvs rdiff -u -r1.44.12.13 -r1.44.12.14 src/sys/arch/mips/mips/genassym.cf
cvs rdiff -u -r1.167.38.8 -r1.167.38.9 src/sys/arch/mips/mips/locore.S
cvs rdiff -u -r0 -r1.1.2.1 src/sys/arch/mips/mips/mips_softint.c
cvs rdiff -u -r1.7 -r0 src/sys/arch/mips/mips/softintr.c
cvs rdiff -u -r1.121.6.1.2.9 -r1.121.6.1.2.10 \
src/sys/arch/mips/mips/vm_machdep.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/mips/conf/files.mips
diff -u src/sys/arch/mips/conf/files.mips:1.58.24.6 src/sys/arch/mips/conf/files.mips:1.58.24.7
--- src/sys/arch/mips/conf/files.mips:1.58.24.6 Fri Jan 29 00:16:58 2010
+++ src/sys/arch/mips/conf/files.mips Fri Feb 5 07:36:51 2010
@@ -1,4 +1,4 @@
-# $NetBSD: files.mips,v 1.58.24.6 2010/01/29 00:16:58 matt Exp $
+# $NetBSD: files.mips,v 1.58.24.7 2010/02/05 07:36:51 matt Exp $
#
defflag opt_cputype.h NOFPU FPEMUL
@@ -39,6 +39,7 @@
file arch/mips/mips/trap.c # trap handlers
file arch/mips/mips/syscall.c # syscall entries
file arch/mips/mips/mips_machdep.c
+file arch/mips/mips/mips_softint.c
file arch/mips/mips/sig_machdep.c # signal delivery
file arch/mips/mips/sys_machdep.c
file arch/mips/mips/vm_machdep.c
Index: src/sys/arch/mips/include/cpu.h
diff -u src/sys/arch/mips/include/cpu.h:1.90.16.17 src/sys/arch/mips/include/cpu.h:1.90.16.18
--- src/sys/arch/mips/include/cpu.h:1.90.16.17 Mon Feb 1 04:16:18 2010
+++ src/sys/arch/mips/include/cpu.h Fri Feb 5 07:36:51 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu.h,v 1.90.16.17 2010/02/01 04:16:18 matt Exp $ */
+/* $NetBSD: cpu.h,v 1.90.16.18 2010/02/05 07:36:51 matt Exp $ */
/*-
* Copyright (c) 1992, 1993
@@ -138,6 +138,8 @@
vaddr_t ci_ebase; /* VA of exception base */
paddr_t ci_ebase_pa; /* PA of exception base */
u_long ci_cctr_freq; /* cycle counter frequency */
+ struct lwp *ci_softlwps[SOFTINT_COUNT];
+#define ci_softints ci_data.cpu_softints
/*
* Per-cpu pmap information
*/
@@ -563,6 +565,9 @@
int badaddr(void *, size_t);
int badaddr64(uint64_t, size_t);
+/* vm_machdep.c */
+void cpu_uarea_remap(struct lwp *);
+
#endif /* ! _LOCORE */
#endif /* _KERNEL */
#endif /* _CPU_H_ */
Index: src/sys/arch/mips/include/cpuregs.h
diff -u src/sys/arch/mips/include/cpuregs.h:1.74.28.13 src/sys/arch/mips/include/cpuregs.h:1.74.28.14
--- src/sys/arch/mips/include/cpuregs.h:1.74.28.13 Wed Jan 20 06:58:35 2010
+++ src/sys/arch/mips/include/cpuregs.h Fri Feb 5 07:36:51 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: cpuregs.h,v 1.74.28.13 2010/01/20 06:58:35 matt Exp $ */
+/* $NetBSD: cpuregs.h,v 1.74.28.14 2010/02/05 07:36:51 matt Exp $ */
/*
* Copyright (c) 1992, 1993
@@ -294,6 +294,8 @@
#define MIPS_HARD_INT_MASK 0xfc00
#define MIPS_SOFT_INT_MASK_1 0x0200
#define MIPS_SOFT_INT_MASK_0 0x0100
+#define MIPS_SOFT_INT_MASK 0x0300
+#define MIPS_INT_MASK_SHIFT 8
/*
* mips3 CPUs have on-chip timer at INT_MASK_5. Each platform can
Index: src/sys/arch/mips/include/locore.h
diff -u src/sys/arch/mips/include/locore.h:1.78.36.1.2.11 src/sys/arch/mips/include/locore.h:1.78.36.1.2.12
--- src/sys/arch/mips/include/locore.h:1.78.36.1.2.11 Mon Feb 1 04:16:19 2010
+++ src/sys/arch/mips/include/locore.h Fri Feb 5 07:36:51 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: locore.h,v 1.78.36.1.2.11 2010/02/01 04:16:19 matt Exp $ */
+/* $NetBSD: locore.h,v 1.78.36.1.2.12 2010/02/05 07:36:51 matt Exp $ */
/*
* Copyright 1996 The Board of Trustees of The Leland Stanford
@@ -43,8 +43,10 @@
int _splset(int);
int _splget(void);
void _splnone(void);
-void _setsoftintr(int);
-void _clrsoftintr(int);
+void _setsoftintr(uint32_t);
+void _clrsoftintr(uint32_t);
+void softint_process(uint32_t);
+void softint_fast_dispatch(struct lwp *, int);
#ifdef MIPS1
void mips1_tlb_set_asid(uint32_t);
Index: src/sys/arch/mips/include/mips_param.h
diff -u src/sys/arch/mips/include/mips_param.h:1.23.78.4 src/sys/arch/mips/include/mips_param.h:1.23.78.5
--- src/sys/arch/mips/include/mips_param.h:1.23.78.4 Sat Sep 12 17:17:05 2009
+++ src/sys/arch/mips/include/mips_param.h Fri Feb 5 07:36:51 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: mips_param.h,v 1.23.78.4 2009/09/12 17:17:05 matt Exp $ */
+/* $NetBSD: mips_param.h,v 1.23.78.5 2010/02/05 07:36:51 matt Exp $ */
#ifdef _KERNEL
#include <machine/cpu.h>
@@ -41,6 +41,7 @@
#define UPAGES 2 /* pages of u-area */
#define USPACE (UPAGES*NBPG) /* size of u-area in bytes */
+#define USPACE_ALIGN USPACE /* make sure it starts on a even VA */
#ifndef MSGBUFSIZE
#define MSGBUFSIZE NBPG /* default message buffer size */
Index: src/sys/arch/mips/include/types.h
diff -u src/sys/arch/mips/include/types.h:1.43.36.12 src/sys/arch/mips/include/types.h:1.43.36.13
--- src/sys/arch/mips/include/types.h:1.43.36.12 Sat Jan 30 23:49:31 2010
+++ src/sys/arch/mips/include/types.h Fri Feb 5 07:36:51 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: types.h,v 1.43.36.12 2010/01/30 23:49:31 matt Exp $ */
+/* $NetBSD: types.h,v 1.43.36.13 2010/02/05 07:36:51 matt Exp $ */
/*-
* Copyright (c) 1992, 1993
@@ -131,6 +131,7 @@
#define __SWAP_BROKEN
+#define __HAVE_FAST_SOFTINTS
#define __HAVE_AST_PERPROC
#define __HAVE_SYSCALL_INTERN
#define __HAVE_PROCESS_XFPREGS
Index: src/sys/arch/mips/mips/genassym.cf
diff -u src/sys/arch/mips/mips/genassym.cf:1.44.12.13 src/sys/arch/mips/mips/genassym.cf:1.44.12.14
--- src/sys/arch/mips/mips/genassym.cf:1.44.12.13 Mon Feb 1 04:16:19 2010
+++ src/sys/arch/mips/mips/genassym.cf Fri Feb 5 07:36:50 2010
@@ -1,4 +1,4 @@
-# $NetBSD: genassym.cf,v 1.44.12.13 2010/02/01 04:16:19 matt Exp $
+# $NetBSD: genassym.cf,v 1.44.12.14 2010/02/05 07:36:50 matt Exp $
#
# Copyright (c) 1992, 1993
# The Regents of the University of California. All rights reserved.
@@ -100,14 +100,15 @@
define MIPS_XKSEG_START MIPS_XKSEG_START
# Important offsets into the lwp and proc structs & associated constants
+define L_CPU offsetof(struct lwp, l_cpu)
define L_ADDR offsetof(struct lwp, l_addr)
define L_PRIORITY offsetof(struct lwp, l_priority)
define L_WCHAN offsetof(struct lwp, l_wchan)
define L_STAT offsetof(struct lwp, l_stat)
define L_PROC offsetof(struct lwp, l_proc)
+define L_CTXSWITCH offsetof(struct lwp, l_ctxswtch)
# Process status constants
-define L_CPU offsetof(struct lwp, l_cpu)
define L_MD_UTF offsetof(struct lwp, l_md.md_utf)
define L_MD_UPTE_0 offsetof(struct lwp, l_md.md_upte[0])
define L_MD_UPTE_1 offsetof(struct lwp, l_md.md_upte[1])
Index: src/sys/arch/mips/mips/locore.S
diff -u src/sys/arch/mips/mips/locore.S:1.167.38.8 src/sys/arch/mips/mips/locore.S:1.167.38.9
--- src/sys/arch/mips/mips/locore.S:1.167.38.8 Mon Feb 1 04:16:19 2010
+++ src/sys/arch/mips/mips/locore.S Fri Feb 5 07:36:50 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: locore.S,v 1.167.38.8 2010/02/01 04:16:19 matt Exp $ */
+/* $NetBSD: locore.S,v 1.167.38.9 2010/02/05 07:36:50 matt Exp $ */
/*
* Copyright (c) 1992, 1993
@@ -201,10 +201,14 @@
* Switch to new context.
*/
PTR_L t2, _C_LABEL(mips_locoresw) + MIPSX_CPU_SWITCH_RESUME
- move a0, MIPS_CURLWP
jal ra, t2
- nop
+ move a0, MIPS_CURLWP
+#ifdef MULTIPROCESSOR
+ PTR_L t2, L_CPU(MIPS_CURLWP)
+ PTR_S MIPS_CURLWP, CPU_INFO_CURLWP(t2)
+#else
PTR_S MIPS_CURLWP, CPUVAR(CURLWP)
+#endif
/* Check for restartable atomic sequences (RAS) */
PTR_L t1, L_PROC(MIPS_CURLWP)
@@ -259,6 +263,96 @@
END(cpu_switchto)
/*
+ * void softint_fast_dispatch(struct lwp *l, int s, void *new_sp);
+ *
+ * called at IPL_HIGH
+ *
+ */
+softint_cleanup:
+ PTR_L t0, L_CPU(MIPS_CURLWP)
+ INT_L t1, CPU_INFO_MTX_COUNT(t0)
+ addi t1, t1, 1
+ INT_S t1, CPU_INFO_MTX_COUNT(t0)
+ REG_L ra, CALLFRAME_RA(sp)
+ PTR_S zero, L_CTXSWITCH(MIPS_CURLWP)
+ j ra
+ PTR_ADDU sp, CALLFRAME_SIZ
+/*
+ * Arguments:
+ * a0 the LWP to switch to
+ * a1 IPL to execute at
+ * a2 the new stack.
+ */
+NESTED(softint_fast_dispatch, CALLFRAME_SIZ, ra)
+ PTR_SUBU sp, CALLFRAME_SIZ
+ REG_S ra, CALLFRAME_RA(sp) # save return address
+ .mask 0x80000000, -4
+ PTR_L t0, L_ADDR(MIPS_CURLWP) # t0 = curlwp->l_addr
+ /*
+ * Save our state in case softint_dispatch blocks and get switched back
+ * to.
+ */
+ mfc0 t1, MIPS_COP_0_STATUS
+ PTR_LA t2, softint_cleanup # if softint blocks, return here
+ REG_PROLOGUE
+ REG_S s0, U_PCB_CONTEXT+SF_REG_S0(t0)
+ REG_S s1, U_PCB_CONTEXT+SF_REG_S1(t0)
+ REG_S s2, U_PCB_CONTEXT+SF_REG_S2(t0)
+ REG_S s3, U_PCB_CONTEXT+SF_REG_S3(t0)
+ REG_S s4, U_PCB_CONTEXT+SF_REG_S4(t0)
+ REG_S s5, U_PCB_CONTEXT+SF_REG_S5(t0)
+ REG_S s6, U_PCB_CONTEXT+SF_REG_S6(t0)
+ REG_S s7, U_PCB_CONTEXT+SF_REG_S7(t0)
+ #REG_S t8, U_PCB_CONTEXT+SF_REG_T8(t0) # MIPS_CURLWP
+ REG_S sp, U_PCB_CONTEXT+SF_REG_SP(t0)
+ REG_S s8, U_PCB_CONTEXT+SF_REG_S8(t0)
+ REG_S t2, U_PCB_CONTEXT+SF_REG_RA(t0)
+ REG_S t1, U_PCB_CONTEXT+SF_REG_SR(t0)
+#if defined(__mips_n32) || defined(__mips_n64)
+ REG_S gp, U_PCB_CONTEXT+SF_REG_GP(t0)
+#endif
+#ifdef IPL_ICU_MASK
+ INT_L t1, _C_LABEL(md_imask)
+ INT_S t1, U_PCB_PPL(a2)
+#endif
+ REG_EPILOGUE
+ /*
+ * Switch to a fast softint thread. We don't care about its existing
+ * state and we use a private KSEG0/XKPHYS mapped stack so don't have
+ * to do TLB manipulation.
+ */
+ move s0, MIPS_CURLWP
+ PTR_L s1, L_CPU(MIPS_CURLWP) # get curcpu()
+ move MIPS_CURLWP, a0 # switch to softint lwp
+ PTR_S MIPS_CURLWP, CPU_INFO_CURLWP(s1) # ...
+ move s2, sp # remember sp
+ move s3, t0 # remember curpcb
+
+ PTR_L t2, L_ADDR(MIPS_CURLWP)
+ move a0, s0 # wants the pinned lwp
+ jal _C_LABEL(softint_dispatch)
+ PTR_ADDU sp, t2, USPACE - TF_SIZ - CALLFRAME_SIZ
+
+ move sp, s2 # restore stack
+ move MIPS_CURLWP, s0 # restore curlwp
+ PTR_S MIPS_CURLWP, CPU_INFO_CURLWP(s1) # ....
+
+ REG_PROLOGUE
+ REG_L s0, U_PCB_CONTEXT+SF_REG_S0(s3) # restore the saved
+ REG_L s1, U_PCB_CONTEXT+SF_REG_S1(s3) # registers that we
+ REG_L s2, U_PCB_CONTEXT+SF_REG_S2(s3) # used
+ REG_L s3, U_PCB_CONTEXT+SF_REG_S3(s3)
+ REG_EPILOGUE
+
+ /*
+ * Almost everything (all except sp) is restored so we ca retrn.
+ */
+ REG_L ra, CALLFRAME_RA(sp)
+ j ra
+ PTR_ADDU sp, CALLFRAME_SIZ
+END(softint_fast_dispatch)
+
+/*
* savectx(struct user *up)
*/
LEAF(savectx)
Index: src/sys/arch/mips/mips/vm_machdep.c
diff -u src/sys/arch/mips/mips/vm_machdep.c:1.121.6.1.2.9 src/sys/arch/mips/mips/vm_machdep.c:1.121.6.1.2.10
--- src/sys/arch/mips/mips/vm_machdep.c:1.121.6.1.2.9 Mon Feb 1 04:16:20 2010
+++ src/sys/arch/mips/mips/vm_machdep.c Fri Feb 5 07:36:50 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: vm_machdep.c,v 1.121.6.1.2.9 2010/02/01 04:16:20 matt Exp $ */
+/* $NetBSD: vm_machdep.c,v 1.121.6.1.2.10 2010/02/05 07:36:50 matt Exp $ */
/*
* Copyright (c) 1992, 1993
@@ -80,7 +80,7 @@
#include "opt_coredump.h"
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
-__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.121.6.1.2.9 2010/02/01 04:16:20 matt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.121.6.1.2.10 2010/02/05 07:36:50 matt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -207,7 +207,103 @@
#ifdef IPL_ICU_MASK
pcb->pcb_ppl = 0; /* machine depenedend interrupt mask */
#endif
-}
+}
+
+static struct evcnt uarea_remapped =
+ EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "uarea", "remapped");
+static struct evcnt uarea_reallocated =
+ EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "uarea", "reallocated");
+EVCNT_ATTACH_STATIC(uarea_remapped);
+EVCNT_ATTACH_STATIC(uarea_reallocated);
+
+void
+cpu_uarea_remap(struct lwp *l)
+{
+ bool uarea_ok;
+ vaddr_t va;
+ paddr_t pa;
+
+ /*
+ * Grab the starting physical address of the uarea.
+ */
+ va = (vaddr_t)l->l_addr;
+ if (!pmap_extract(pmap_kernel(), va, &pa))
+ panic("%s: pmap_extract(%#"PRIxVADDR") failed", __func__, va);
+
+ /*
+ * Check to see if the existing uarea is physically contiguous.
+ */
+ uarea_ok = true;
+ for (vaddr_t i = PAGE_SIZE; uarea_ok && i < USPACE; i += PAGE_SIZE) {
+ paddr_t pa0;
+ if (!pmap_extract(pmap_kernel(), va + i, &pa0))
+ panic("%s: pmap_extract(%#"PRIxVADDR") failed",
+ __func__, va+1);
+ uarea_ok = (pa0 - pa == i);
+ }
+
+#ifndef _LP64
+ /*
+ * If this is a 32bit kernel, it needs to be mappedable via KSEG0
+ */
+ uarea_ok = uarea_ok && (pa + USPACE - 1 <= MIPS_PHYS_MASK);
+#endif
+ printf("ctx=%#"PRIxVADDR" utf=%p\n",
+ (vaddr_t)l->l_addr->u_pcb.pcb_context.val[_L_SP],
+ l->l_md.md_utf);
+ KASSERT((vaddr_t)l->l_addr->u_pcb.pcb_context.val[_L_SP] == (vaddr_t)l->l_md.md_utf);
+ vaddr_t sp = l->l_addr->u_pcb.pcb_context.val[_L_SP] - (vaddr_t)l->l_addr;
+
+ if (!uarea_ok) {
+ struct pglist pglist;
+#ifdef _LP64
+ const paddr_t high = mips_avail_end;
+#else
+ const paddr_t high = MIPS_KSEG1_START - MIPS_KSEG0_START;
+#endif
+ int error;
+
+ /*
+ * Allocate a new physically contiguou uarea which can be
+ * direct-mapped.
+ */
+ error = uvm_pglistalloc(USPACE, mips_avail_start, high,
+ USPACE_ALIGN, 0, &pglist, 1, 1);
+ if (error)
+ panic("softint_init_md: uvm_pglistalloc failed: %d",
+ error);
+
+ /*
+ * Get the physical address from the first page.
+ */
+ pa = VM_PAGE_TO_PHYS(TAILQ_FIRST(&pglist));
+ }
+
+ /*
+ * Now set the new uarea (if it's different). If l->l_addr was already
+ * direct mapped address then routine really change anything but that's
+ * not probably so don't micro optimize for it.
+ */
+#ifdef _LP64
+ va = MIPS_PHYS_TO_XKPHYS_CACHED(pa);
+#else
+ va = MIPS_PHYS_TO_KSEG0(pa);
+#endif
+ if (!uarea_ok) {
+ ((struct trapframe *)(va + USPACE))[-1] = *l->l_md.md_utf;
+ *(struct pcb *)va = l->l_addr->u_pcb;
+ /*
+ * Discard the old uarea.
+ */
+ uvm_uarea_free(USER_TO_UAREA(l->l_addr), curcpu());
+ uarea_reallocated.ev_count++;
+ }
+
+ l->l_addr = (struct user *)va;
+ l->l_addr->u_pcb.pcb_context.val[_L_SP] = sp + va;
+ l->l_md.md_utf = (struct trapframe *)((char *)l->l_addr + USPACE) - 1;
+ uarea_remapped.ev_count++;
+}
/*
* Finish a swapin operation.
Added files:
Index: src/sys/arch/mips/mips/mips_softint.c
diff -u /dev/null src/sys/arch/mips/mips/mips_softint.c:1.1.2.1
--- /dev/null Fri Feb 5 07:36:51 2010
+++ src/sys/arch/mips/mips/mips_softint.c Fri Feb 5 07:36:50 2010
@@ -0,0 +1,142 @@
+/*-
+ * Copyright (c) 2009, 2010 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas <m...@3am-software.com>.
+ *
+ * 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 <sys/cdefs.h> /* RCS ID & Copyright macro defns */
+
+__KERNEL_RCSID(0, "$NetBSD: mips_softint.c,v 1.1.2.1 2010/02/05 07:36:50 matt Exp $");
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/lwp.h>
+#include <sys/user.h>
+#include <sys/intr.h>
+#include <sys/atomic.h>
+
+#include <uvm/uvm_extern.h>
+
+#include <mips/locore.h>
+
+#define SOFTINT_BIO_MASK (1 << SOFTINT_BIO)
+#define SOFTINT_CLOCK_MASK (1 << SOFTINT_CLOCK)
+#define SOFTINT_NET_MASK (1 << SOFTINT_NET)
+#define SOFTINT_SERIAL_MASK (1 << SOFTINT_SERIAL)
+
+/*
+ * This is more complex than usual since we want the fast softint threads
+ * to have stacks that are direct-mapped and avoid the TLB. This means we
+ * can avoid changing the TLB entry that maps the current lwp's kernel stack.
+ *
+ * This is a very big win so it's worth going through this effort.
+ */
+void
+softint_init_md(lwp_t *l, u_int si_level, uintptr_t *machdep)
+{
+ struct cpu_info * const ci = l->l_cpu;
+
+ cpu_uarea_remap(l); /* switch to direct mapped stack */
+
+ *machdep = si_level;
+ ci->ci_softlwps[si_level] = l;
+}
+
+void
+softint_trigger(uintptr_t si)
+{
+ /*
+ * Set the appropriate cause bit. serial & net are 1 bit higher than
+ * clock & bio. This avoid a branch and is fast.
+ */
+ const uint32_t int_mask = MIPS_SOFT_INT_MASK_0
+ << (((SOFTINT_NET_MASK | SOFTINT_SERIAL_MASK) >> si) & 1);
+
+ /*
+ * Use atomic_or since it's faster than splhigh/splx
+ */
+ atomic_or_uint(&curcpu()->ci_softints, 1 << si);
+
+ /*
+ * Now update cause.
+ */
+ _setsoftintr(int_mask);
+}
+
+#define SOFTINT_MASK_1 (SOFTINT_SERIAL_MASK | SOFTINT_NET_MASK)
+#define SOFTINT_MASK_0 (SOFTINT_CLOCK_MASK | SOFTINT_BIO_MASK)
+
+/*
+ * Helper macro.
+ *
+ * Dispatch a softint and then restart the loop so that higher
+ * priority softints are always done first.
+ */
+#define DOSOFTINT(level) \
+ if (softints & SOFTINT_##level## _MASK) { \
+ ci->ci_softints ^= SOFTINT_##level##_MASK; \
+ softint_fast_dispatch(ci->ci_softlwps[SOFTINT_##level], \
+ IPL_SOFT##level); \
+ continue; \
+ }
+
+void
+softint_process(uint32_t ipending)
+{
+ struct cpu_info * const ci = curcpu();
+ u_int mask;
+ int s;
+
+ KASSERT((ipending & MIPS_SOFT_INT_MASK) != 0);
+ KASSERT((ipending & ~MIPS_SOFT_INT_MASK) == 0);
+
+ if (ipending & MIPS_SOFT_INT_MASK_0) {
+ /*
+ * Since we run at splhigh,
+ */
+ mask = SOFTINT_MASK_1 | SOFTINT_MASK_0;
+ ipending |= MIPS_SOFT_INT_MASK_1;
+ } else {
+ KASSERT(ipending & MIPS_SOFT_INT_MASK_1);
+ mask = SOFTINT_MASK_1;
+ }
+
+ s = splhigh();
+
+ for (;;) {
+ u_int softints = ci->ci_softints & mask;
+ if (softints == 0)
+ break;
+
+ DOSOFTINT(SERIAL);
+ DOSOFTINT(NET);
+ DOSOFTINT(BIO);
+ DOSOFTINT(CLOCK);
+ }
+
+ _clrsoftintr(ipending);
+ splx(s);
+}
