The branch main has been updated by andrew:
URL:
https://cgit.FreeBSD.org/src/commit/?id=6abad5b6062d9e8f7e6dd08eaa4033a5358b952e
commit 6abad5b6062d9e8f7e6dd08eaa4033a5358b952e
Author: Andrew Turner <and...@freebsd.org>
AuthorDate: 2024-06-10 14:58:47 +0000
Commit: Andrew Turner <and...@freebsd.org>
CommitDate: 2024-06-10 15:16:10 +0000
Remove the arm FIQ support
It isn't used, and only masks/unmasks FIQs on the local CPU so will be
broken on SMP.
Reviewed by: mmel
Differential Revision: https://reviews.freebsd.org/D33804
---
sys/arm/arm/autoconf.c | 2 +-
sys/arm/arm/exception.S | 37 +----------
sys/arm/arm/fiq.c | 163 ------------------------------------------------
sys/arm/arm/fiq_subr.S | 92 ---------------------------
sys/arm/arm/machdep.c | 2 +-
sys/arm/arm/pmap-v6.c | 4 +-
sys/arm/arm/syscall.c | 2 -
sys/arm/arm/trap-v6.c | 4 +-
sys/arm/arm/undefined.c | 2 -
sys/arm/include/cpu.h | 2 +-
sys/arm/include/fiq.h | 71 ---------------------
sys/conf/files.arm | 2 -
12 files changed, 9 insertions(+), 374 deletions(-)
diff --git a/sys/arm/arm/autoconf.c b/sys/arm/arm/autoconf.c
index 23289db9c19a..fe2882dc6d9f 100644
--- a/sys/arm/arm/autoconf.c
+++ b/sys/arm/arm/autoconf.c
@@ -90,7 +90,7 @@ static void
configure_final(void *dummy)
{
- enable_interrupts(PSR_I | PSR_F);
+ enable_interrupts(PSR_I);
cninit_finish();
cold = 0;
}
diff --git a/sys/arm/arm/exception.S b/sys/arm/arm/exception.S
index d2e55bd7d84d..d0be3bd9c90a 100644
--- a/sys/arm/arm/exception.S
+++ b/sys/arm/arm/exception.S
@@ -165,12 +165,12 @@ _C_LABEL(dtrace_invop_jump_addr):
#define DO_AST
\
ldr r0, [sp]; /* Get the SPSR from stack */ \
mrs r4, cpsr; /* save CPSR */ \
- orr r1, r4, #(PSR_I|PSR_F); \
+ orr r1, r4, #(PSR_I); \
msr cpsr_c, r1; /* Disable interrupts */ \
and r0, r0, #(PSR_MODE); /* Returning to USR mode? */ \
teq r0, #(PSR_USR32_MODE); \
bne 2f; /* Nope, get out now */ \
- bic r4, r4, #(PSR_I|PSR_F); \
+ bic r4, r4, #(PSR_I); \
1: GET_CURTHREAD_PTR(r5); \
ldr r1, [r5, #(TD_AST)]; \
teq r1, #0; \
@@ -178,7 +178,7 @@ _C_LABEL(dtrace_invop_jump_addr):
msr cpsr_c, r4; /* Restore interrupts */ \
mov r0, sp; \
bl _C_LABEL(ast); /* ast(frame) */ \
- orr r0, r4, #(PSR_I|PSR_F); \
+ orr r0, r4, #(PSR_I); \
msr cpsr_c, r0; \
b 1b; \
2:
@@ -315,21 +315,6 @@ ASENTRY_NP(irq_entry)
b _C_LABEL(intr_irq_handler)/* trapframe to the handler. */
END(irq_entry)
-/*
- * Entry point for an FIQ interrupt.
- *
- * We don't currently support FIQ handlers very much. Something can
- * install itself in the FIQ vector using code (that may or may not work
- * these days) in fiq.c. If nobody does that and an FIQ happens, this
- * default handler just disables FIQs and otherwise ignores it.
- */
-ASENTRY_NP(fiq_entry)
- mrs r8, cpsr /* FIQ handling isn't supported, */
- bic r8, #(PSR_F) /* just disable FIQ and return. */
- msr cpsr_c, r8 /* The r8 we trash here is the */
- subs pc, lr, #4 /* banked FIQ-mode r8. */
-END(fiq_entry)
-
/*
* Entry point for an Address Exception exception.
* This is an arm26 exception that should never happen.
@@ -378,8 +363,6 @@ _C_LABEL(page0):
ldr pc, .Ldata_abort_entry
ldr pc, .Laddr_exception_entry
ldr pc, .Lirq_entry
-.fiqv: ldr pc, .Lfiq_entry
- .space 256 /* room for some fiq handler code */
_C_LABEL(page0_data):
.Lreset_entry: .word reset_entry
@@ -389,18 +372,4 @@ _C_LABEL(page0_data):
.Ldata_abort_entry: .word data_abort_entry
.Laddr_exception_entry: .word addr_exception_entry
.Lirq_entry: .word irq_entry
-.Lfiq_entry: .word fiq_entry
-
-/*
- * These items are used by the code in fiq.c to install what it calls the
- * "null" handler. It's actually our default vector entry that just jumps
- * to the default handler which just disables FIQs and returns.
- */
- .global _C_LABEL(fiq_nullhandler_code), _C_LABEL(fiq_nullhandler_size)
-
-_C_LABEL(fiq_nullhandler_code):
- .word .fiqv
-_C_LABEL(fiq_nullhandler_size):
- .word 4
-
diff --git a/sys/arm/arm/fiq.c b/sys/arm/arm/fiq.c
deleted file mode 100644
index e517bbeaf01b..000000000000
--- a/sys/arm/arm/fiq.c
+++ /dev/null
@@ -1,163 +0,0 @@
-/* $NetBSD: fiq.c,v 1.5 2002/04/03 23:33:27 thorpej Exp $ */
-
-/*-
- * SPDX-License-Identifier: BSD-4-Clause
- *
- * Copyright (c) 2001, 2002 Wasabi Systems, Inc.
- * All rights reserved.
- *
- * Written by Jason R. Thorpe for Wasabi Systems, Inc.
- *
- * 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed for the NetBSD Project by
- * Wasabi Systems, Inc.
- * 4. The name of Wasabi Systems, Inc. may not be used to endorse
- * or promote products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
- * 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/param.h>
-#include <sys/systm.h>
-
-#include <machine/armreg.h>
-#include <machine/cpufunc.h>
-#include <machine/fiq.h>
-#include <vm/vm.h>
-#include <machine/pcb.h>
-#include <vm/pmap.h>
-#include <machine/cpu.h>
-
-TAILQ_HEAD(, fiqhandler) fiqhandler_stack =
- TAILQ_HEAD_INITIALIZER(fiqhandler_stack);
-
-extern char *fiq_nullhandler_code;
-extern uint32_t fiq_nullhandler_size;
-
-/*
- * fiq_installhandler:
- *
- * Actually install the FIQ handler down at the FIQ vector.
- *
- * The FIQ vector is fixed by the hardware definition as the
- * seventh 32-bit word in the vector page.
- *
- * Note: If the FIQ is invoked via an extra layer of
- * indirection, the actual FIQ code store lives in the
- * data segment, so there is no need to manipulate
- * the vector page's protection.
- */
-static void
-fiq_installhandler(void *func, size_t size)
-{
- const uint32_t fiqvector = 7 * sizeof(uint32_t);
-
- memcpy((void *)(vector_page + fiqvector), func, size);
- icache_sync((vm_offset_t) fiqvector, size);
-}
-
-/*
- * fiq_claim:
- *
- * Claim the FIQ vector.
- */
-int
-fiq_claim(struct fiqhandler *fh)
-{
- struct fiqhandler *ofh;
- u_int oldirqstate;
- int error = 0;
-
- if (fh->fh_size > 0x100)
- return (EFBIG);
-
- oldirqstate = disable_interrupts(PSR_F);
-
- if ((ofh = TAILQ_FIRST(&fiqhandler_stack)) != NULL) {
- if ((ofh->fh_flags & FH_CANPUSH) == 0) {
- error = EBUSY;
- goto out;
- }
-
- /* Save the previous FIQ handler's registers. */
- if (ofh->fh_regs != NULL)
- fiq_getregs(ofh->fh_regs);
- }
-
- /* Set FIQ mode registers to ours. */
- if (fh->fh_regs != NULL)
- fiq_setregs(fh->fh_regs);
-
- TAILQ_INSERT_HEAD(&fiqhandler_stack, fh, fh_list);
-
- /* Now copy the actual handler into place. */
- fiq_installhandler(fh->fh_func, fh->fh_size);
-
- /* Make sure FIQs are enabled when we return. */
- oldirqstate &= ~PSR_F;
-
- out:
- restore_interrupts(oldirqstate);
- return (error);
-}
-
-/*
- * fiq_release:
- *
- * Release the FIQ vector.
- */
-void
-fiq_release(struct fiqhandler *fh)
-{
- u_int oldirqstate;
- struct fiqhandler *ofh;
-
- oldirqstate = disable_interrupts(PSR_F);
-
- /*
- * If we are the currently active FIQ handler, then we
- * need to save our registers and pop the next one back
- * into the vector.
- */
- if (fh == TAILQ_FIRST(&fiqhandler_stack)) {
- if (fh->fh_regs != NULL)
- fiq_getregs(fh->fh_regs);
- TAILQ_REMOVE(&fiqhandler_stack, fh, fh_list);
- if ((ofh = TAILQ_FIRST(&fiqhandler_stack)) != NULL) {
- if (ofh->fh_regs != NULL)
- fiq_setregs(ofh->fh_regs);
- fiq_installhandler(ofh->fh_func, ofh->fh_size);
- }
- } else
- TAILQ_REMOVE(&fiqhandler_stack, fh, fh_list);
-
- if (TAILQ_FIRST(&fiqhandler_stack) == NULL) {
- /* Copy the NULL handler back down into the vector. */
- fiq_installhandler(fiq_nullhandler_code, fiq_nullhandler_size);
-
- /* Make sure FIQs are disabled when we return. */
- oldirqstate |= PSR_F;
- }
-
- restore_interrupts(oldirqstate);
-}
diff --git a/sys/arm/arm/fiq_subr.S b/sys/arm/arm/fiq_subr.S
deleted file mode 100644
index e2fc793d2fd3..000000000000
--- a/sys/arm/arm/fiq_subr.S
+++ /dev/null
@@ -1,92 +0,0 @@
-/* $NetBSD: fiq_subr.S,v 1.3 2002/04/12 18:50:31 thorpej Exp $ */
-
-/*-
- * Copyright (c) 2001 Wasabi Systems, Inc.
- * All rights reserved.
- *
- * Written by Jason R. Thorpe for Wasabi Systems, Inc.
- *
- * 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed for the NetBSD Project by
- * Wasabi Systems, Inc.
- * 4. The name of Wasabi Systems, Inc. may not be used to endorse
- * or promote products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
- * 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 <machine/asm.h>
-#include <machine/armreg.h>
-
-/*
- * MODE_CHANGE_NOP should be inserted between a mode change and a
- * banked register (R8--R15) access.
- */
-#if defined(CPU_ARM2) || defined(CPU_ARM250)
-#define MODE_CHANGE_NOP mov r0, r0
-#else
-#define MODE_CHANGE_NOP /* Data sheet says ARM3 doesn't need it */
-#endif
-
-#define SWITCH_TO_FIQ_MODE
\
- mrs r2, cpsr ; \
- mov r3, r2 ; \
- bic r2, r2, #(PSR_MODE) ; \
- orr r2, r2, #(PSR_FIQ32_MODE) ; \
- msr cpsr_fsxc, r2
-
-#define BACK_TO_SVC_MODE
\
- msr cpsr_fsxc, r3
-
-/*
- * fiq_getregs:
- *
- * Fetch the FIQ mode banked registers into the fiqhandler
- * structure.
- */
-ENTRY(fiq_getregs)
- SWITCH_TO_FIQ_MODE
-
- stmia r0, {r8-r13}
-
- BACK_TO_SVC_MODE
- RET
-END(fiq_getregs)
-
-/*
- * fiq_setregs:
- *
- * Load the FIQ mode banked registers from the fiqhandler
- * structure.
- */
-ENTRY(fiq_setregs)
- SWITCH_TO_FIQ_MODE
-
- ldmia r0, {r8-r13}
-
- BACK_TO_SVC_MODE
- RET
-END(fiq_setregs)
-
diff --git a/sys/arm/arm/machdep.c b/sys/arm/arm/machdep.c
index f54113e3d0ca..fdaf5d3dade8 100644
--- a/sys/arm/arm/machdep.c
+++ b/sys/arm/arm/machdep.c
@@ -314,7 +314,7 @@ spinlock_enter(void)
td = curthread;
if (td->td_md.md_spinlock_count == 0) {
- cspr = disable_interrupts(PSR_I | PSR_F);
+ cspr = disable_interrupts(PSR_I);
td->td_md.md_spinlock_count = 1;
td->td_md.md_saved_cspr = cspr;
critical_enter();
diff --git a/sys/arm/arm/pmap-v6.c b/sys/arm/arm/pmap-v6.c
index 8d7292f7aa02..de1082e7ae62 100644
--- a/sys/arm/arm/pmap-v6.c
+++ b/sys/arm/arm/pmap-v6.c
@@ -3364,7 +3364,7 @@ pmap_change_pte1(pmap_t pmap, pt1_entry_t *pte1p,
vm_offset_t va,
* will be affected by the broken mapping, disable interrupts
* until the mapping change is completed.
*/
- cspr = disable_interrupts(PSR_I | PSR_F);
+ cspr = disable_interrupts(PSR_I);
pte1_clear(pte1p);
pmap_tlb_flush_pte1(pmap, va, npte1);
pte1_store(pte1p, npte1);
@@ -3389,7 +3389,7 @@ pmap_change_pte1(pmap_t pmap, pt1_entry_t *pte1p,
vm_offset_t va,
* mappings. It's absolutely safe in UP case when interrupts
* are disabled.
*/
- cspr = disable_interrupts(PSR_I | PSR_F);
+ cspr = disable_interrupts(PSR_I);
pte1_clear(pte1p);
pmap_tlb_flush_pte1(pmap, va, npte1);
pte1_store(pte1p, npte1);
diff --git a/sys/arm/arm/syscall.c b/sys/arm/arm/syscall.c
index 73ac0560cd91..cce63cdadf32 100644
--- a/sys/arm/arm/syscall.c
+++ b/sys/arm/arm/syscall.c
@@ -160,8 +160,6 @@ swi_handler(struct trapframe *frame)
if (td->td_md.md_spinlock_count == 0) {
if (__predict_true(frame->tf_spsr & PSR_I) == 0)
enable_interrupts(PSR_I);
- if (__predict_true(frame->tf_spsr & PSR_F) == 0)
- enable_interrupts(PSR_F);
}
syscall(td, frame);
diff --git a/sys/arm/arm/trap-v6.c b/sys/arm/arm/trap-v6.c
index 681f1f90eec6..d58f8c2e4a48 100644
--- a/sys/arm/arm/trap-v6.c
+++ b/sys/arm/arm/trap-v6.c
@@ -408,8 +408,6 @@ abort_handler(struct trapframe *tf, int prefetch)
if (td->td_md.md_spinlock_count == 0) {
if (__predict_true(tf->tf_spsr & PSR_I) == 0)
enable_interrupts(PSR_I);
- if (__predict_true(tf->tf_spsr & PSR_F) == 0)
- enable_interrupts(PSR_F);
}
p = td->td_proc;
@@ -565,7 +563,7 @@ abort_fatal(struct trapframe *tf, u_int idx, u_int fsr,
u_int far,
mode = usermode ? "user" : "kernel";
rw_mode = fsr & FSR_WNR ? "write" : "read";
- disable_interrupts(PSR_I|PSR_F);
+ disable_interrupts(PSR_I);
if (td != NULL) {
printf("Fatal %s mode data abort: '%s' on %s\n", mode,
diff --git a/sys/arm/arm/undefined.c b/sys/arm/arm/undefined.c
index dc29b55ae596..e882a911ba4a 100644
--- a/sys/arm/arm/undefined.c
+++ b/sys/arm/arm/undefined.c
@@ -226,8 +226,6 @@ undefinedinstruction(struct trapframe *frame)
/* Enable interrupts if they were enabled before the exception. */
if (__predict_true(frame->tf_spsr & PSR_I) == 0)
enable_interrupts(PSR_I);
- if (__predict_true(frame->tf_spsr & PSR_F) == 0)
- enable_interrupts(PSR_F);
VM_CNT_INC(v_trap);
diff --git a/sys/arm/include/cpu.h b/sys/arm/include/cpu.h
index b2c370d01cdc..75b0956d0620 100644
--- a/sys/arm/include/cpu.h
+++ b/sys/arm/include/cpu.h
@@ -729,7 +729,7 @@ get_cyclecount(void)
#define cpu_spinwait() /* nothing */
#define cpu_lock_delay() DELAY(1)
-#define ARM_NVEC 8
+#define ARM_NVEC 7
#define ARM_VEC_ALL 0xffffffff
extern vm_offset_t vector_page;
diff --git a/sys/arm/include/fiq.h b/sys/arm/include/fiq.h
deleted file mode 100644
index f01011bb63ce..000000000000
--- a/sys/arm/include/fiq.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* $NetBSD: fiq.h,v 1.1 2001/12/20 01:20:23 thorpej Exp $ */
-
-/*-
- * SPDX-License-Identifier: BSD-4-Clause
- *
- * Copyright (c) 2001 Wasabi Systems, Inc.
- * All rights reserved.
- *
- * Written by Jason R. Thorpe for Wasabi Systems, Inc.
- *
- * 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed for the NetBSD Project by
- * Wasabi Systems, Inc.
- * 4. The name of Wasabi Systems, Inc. may not be used to endorse
- * or promote products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
- * 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.
- *
- */
-
-#ifndef _MACHINE_FIQ_H_
-#define _MACHINE_FIQ_H_
-
-#include <sys/queue.h>
-
-struct fiqregs {
- u_int fr_r8; /* FIQ mode r8 */
- u_int fr_r9; /* FIQ mode r9 */
- u_int fr_r10; /* FIQ mode r10 */
- u_int fr_r11; /* FIQ mode r11 */
- u_int fr_r12; /* FIQ mode r12 */
- u_int fr_r13; /* FIQ mode r13 */
-};
-
-struct fiqhandler {
- TAILQ_ENTRY(fiqhandler) fh_list;/* link in the FIQ handler stack */
- void *fh_func; /* FIQ handler routine */
- size_t fh_size; /* size of FIQ handler */
- int fh_flags; /* flags; see below */
- struct fiqregs *fh_regs; /* pointer to regs structure */
-};
-
-#define FH_CANPUSH 0x01 /* can push this handler out of the way
*/
-
-int fiq_claim(struct fiqhandler *);
-void fiq_release(struct fiqhandler *);
-
-void fiq_getregs(struct fiqregs *);
-void fiq_setregs(struct fiqregs *);
-
-#endif /* _MACHINE_FIQ_H_ */
diff --git a/sys/conf/files.arm b/sys/conf/files.arm
index 110c0a9e9dbf..b049479fbe82 100644
--- a/sys/conf/files.arm
+++ b/sys/conf/files.arm
@@ -25,8 +25,6 @@ arm/arm/elf_machdep.c standard
arm/arm/elf_note.S standard
arm/arm/exception.S standard
arm/arm/exec_machdep.c standard
-arm/arm/fiq.c standard
-arm/arm/fiq_subr.S standard
arm/arm/fusu.S standard
arm/arm/gdb_machdep.c optional gdb
arm/arm/generic_timer.c optional generic_timer
