a448b62ac9
interrupt threads to run with it always >= 1, so that malloc can detect M_WAITOK from "interrupt" context. This is also necessary in order to context switch from sched_ithd() directly. Reviewed By: peter
136 lines
4.1 KiB
ArmAsm
136 lines
4.1 KiB
ArmAsm
/*-
|
|
* Copyright (c) 1989, 1990 William F. Jolitz.
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* William Jolitz.
|
|
*
|
|
* 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 by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* @(#)ipl.s
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
|
|
/*
|
|
* AT/386
|
|
* Vector interrupt control section
|
|
*/
|
|
|
|
.text
|
|
|
|
/*
|
|
* void doreti(struct trapframe)
|
|
*
|
|
* Handle return from interrupts, traps and syscalls.
|
|
*/
|
|
SUPERALIGN_TEXT
|
|
.type _doreti,@function
|
|
_doreti:
|
|
FAKE_MCOUNT(_bintr) /* init "from" _bintr -> _doreti */
|
|
doreti_next:
|
|
/* Check for ASTs that can be handled now. */
|
|
testl $AST_PENDING,PCPU(ASTPENDING)
|
|
je doreti_exit /* no AST, exit */
|
|
testb $SEL_RPL_MASK,TF_CS(%esp) /* are we in user mode? */
|
|
jne doreti_ast /* yes, do it now. */
|
|
testl $PSL_VM,TF_EFLAGS(%esp) /* kernel mode */
|
|
je doreti_exit /* and not VM86 mode, defer */
|
|
cmpl $1,_in_vm86call /* are we in a VM86 call? */
|
|
jne doreti_ast /* yes, we can do it */
|
|
|
|
/*
|
|
* doreti_exit: release MP lock, pop registers, iret.
|
|
*
|
|
* Note that the syscall trap shortcuts to doreti_syscall_ret.
|
|
* The segment register pop is a special case, since it may
|
|
* fault if (for example) a sigreturn specifies bad segment
|
|
* registers. The fault is handled in trap.c.
|
|
*/
|
|
doreti_exit:
|
|
MEXITCOUNT
|
|
|
|
.globl doreti_popl_fs
|
|
.globl doreti_syscall_ret
|
|
doreti_syscall_ret:
|
|
doreti_popl_fs:
|
|
popl %fs
|
|
.globl doreti_popl_es
|
|
doreti_popl_es:
|
|
popl %es
|
|
.globl doreti_popl_ds
|
|
doreti_popl_ds:
|
|
popl %ds
|
|
popal
|
|
addl $8,%esp
|
|
.globl doreti_iret
|
|
doreti_iret:
|
|
iret
|
|
|
|
/*
|
|
* doreti_iret_fault and friends. Alternative return code for
|
|
* the case where we get a fault in the doreti_exit code
|
|
* above. trap() (i386/i386/trap.c) catches this specific
|
|
* case, sends the process a signal and continues in the
|
|
* corresponding place in the code below.
|
|
*/
|
|
ALIGN_TEXT
|
|
.globl doreti_iret_fault
|
|
doreti_iret_fault:
|
|
subl $8,%esp
|
|
pushal
|
|
pushl %ds
|
|
.globl doreti_popl_ds_fault
|
|
doreti_popl_ds_fault:
|
|
pushl %es
|
|
.globl doreti_popl_es_fault
|
|
doreti_popl_es_fault:
|
|
pushl %fs
|
|
.globl doreti_popl_fs_fault
|
|
doreti_popl_fs_fault:
|
|
movl $0,TF_ERR(%esp) /* XXX should be the error code */
|
|
movl $T_PROTFLT,TF_TRAPNO(%esp)
|
|
jmp alltraps_with_regs_pushed
|
|
|
|
ALIGN_TEXT
|
|
doreti_ast:
|
|
andl $~AST_PENDING,PCPU(ASTPENDING)
|
|
sti
|
|
movl $T_ASTFLT,TF_TRAPNO(%esp)
|
|
call _ast
|
|
jmp doreti_next
|
|
|
|
#ifdef APIC_IO
|
|
#include "i386/isa/apic_ipl.s"
|
|
#else
|
|
#include "i386/isa/icu_ipl.s"
|
|
#endif /* APIC_IO */
|