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/* $OpenBSD: intr.h,v 1.2 2004/08/10 18:52:58 deraadt Exp $ */
/*
* Copyright (c) 2001-2004 Opsycon AB (www.opsycon.se / www.opsycon.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 AUTHOR ``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 AUTHOR 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_INTR_H_
#define _MACHINE_INTR_H_
/*
* The interrupt mask cpl is a mask which can be used with the
* CPU interrupt mask register or an external HW mask register.
* If interrupts are masked by the CPU interrupt mask all external
* masks should be enabled and any routing set up so that the
* interrupt source is routed to the CPU interrupt corresponding
* to the interrupts "priority level". In this case the generic
* interrupt handler can be used.
*
* The IMASK_EXTERNAL define is used to select wether the CPU
* interrupt mask should be controlled by the cpl mask value
* or not. If the mask is external, the CPU mask is never changed
* from the value it gets when interrupt dispatchers are registred.
* When an external masking register is used dedicated interrupt
* handlers must be written as well as ipending handlers.
*/
#define IMASK_EXTERNAL /* XXX move this to config */
/* Interrupt priority `levels'; not mutually exclusive. */
#define IPL_BIO 0 /* block I/O */
#define IPL_NET 1 /* network */
#define IPL_TTY 2 /* terminal */
#define IPL_VM 3 /* memory allocation */
#define IPL_CLOCK 4 /* clock */
#define IPL_NONE 5 /* nothing */
#define IPL_HIGH 6 /* everything */
#define NIPLS 7 /* Number of levels */
/* Interrupt sharing types. */
#define IST_NONE 0 /* none */
#define IST_PULSE 1 /* pulsed */
#define IST_EDGE 2 /* edge-triggered */
#define IST_LEVEL 3 /* level-triggered */
/* Soft interrupt masks. */
#define SINT_CLOCK 31
#define SINT_CLOCKMASK (1 << SINT_CLOCK)
#define SINT_NET 30
#define SINT_NETMASK ((1 << SINT_NET) | SINT_CLOCKMASK)
#define SINT_TTY 29
#define SINT_TTYMASK ((1 << SINT_TTY) | SINT_CLOCKMASK)
#define SINT_ALLMASK (SINT_CLOCKMASK | SINT_NETMASK | SINT_TTYMASK)
#define SPL_CLOCK 28
#define SPL_CLOCKMASK (1 << SPL_CLOCK)
#ifndef _LOCORE
#if 1
#define splbio() splraise(imask[IPL_BIO])
#define splnet() splraise(imask[IPL_NET])
#define spltty() splraise(imask[IPL_TTY])
#define splclock() splraise(SPL_CLOCKMASK|SINT_ALLMASK)
#define splimp() splraise(imask[IPL_VM])
#define splvm() splraise(imask[IPL_VM])
#define splsoftclock() splraise(SINT_CLOCKMASK)
#define splsoftnet() splraise(SINT_NETMASK|SINT_CLOCKMASK)
#define splsofttty() splraise(SINT_TTYMASK)
#else
#define splbio() splhigh()
#define splnet() splhigh()
#define spltty() splhigh()
#define splclock() splhigh()
#define splimp() splhigh()
#define splvm() splhigh()
#define splsoftclock() splhigh()
#define splsoftnet() splhigh()
#define splsofttty() splhigh()
#endif
#define splstatclock() splhigh()
#define splhigh() splraise(-1)
#define spl0() spllower(0)
#define spllowersoftclock() spllower(SINT_CLOCKMASK)
#define setsoftclock() set_sint(SINT_CLOCKMASK);
#define setsoftnet() set_sint(SINT_NETMASK);
#define setsofttty() set_sint(SINT_TTYMASK);
void splinit(void);
#define splassert(X)
/*
* Schedule prioritys for base interrupts (cpu)
*/
#define INTPRI_CLOCK 1
#define INTPRI_MACEIO 2
#define INTPRI_MACEAUX 3
/*
* Define a type for interrupt masks. We may need 64 bits here.
*/
typedef u_int32_t intrmask_t; /* Type of var holding interrupt mask */
#define INTMASKSIZE (sizeof(intrmask_t) * 8)
void clearsoftclock(void);
void clearsoftnet(void);
#if 0
void clearsofttty(void);
#endif
volatile intrmask_t cpl;
volatile intrmask_t ipending, astpending;
intrmask_t imask[NIPLS];
/*
* A note on clock interrupts. Clock interrupts are always
* allowed to happen but will not be serviced if masked.
* The reason for this is that clocks usually sits on INT5
* and can not be easily masked if external HW masking is used.
*/
/* Inlines */
static __inline void register_pending_int_handler(void (*)(void));
static __inline int splraise(int newcpl);
static __inline void splx(int newcpl);
static __inline int spllower(int newcpl);
typedef void (void_f) (void);
void_f *pending_hand;
static __inline void
register_pending_int_handler(void(*pending)(void))
{
pending_hand = pending;
}
/*
*/
static __inline int
splraise(int newcpl)
{
int oldcpl;
__asm__ (" .set noreorder\n");
oldcpl = cpl;
cpl = oldcpl | newcpl;
__asm__ (" sync\n .set reorder\n");
return(oldcpl);
}
static __inline void
splx(int newcpl)
{
cpl = newcpl;
if((ipending & ~newcpl) && (pending_hand != NULL)) {
(*pending_hand)();
}
}
static __inline int
spllower(int newcpl)
{
int oldcpl;
oldcpl = cpl;
cpl = newcpl;
if((ipending & ~newcpl) && (pending_hand != NULL)) {
(*pending_hand)();
}
return(oldcpl);
}
/*
* Atomically update ipending.
*/
void set_sint(int pending);
/*
* Interrupt control struct used by interrupt dispatchers
* to hold interrupt handler info.
*/
struct intrhand {
struct intrhand *ih_next;
int (*ih_fun)(void *);
void *ih_arg;
u_long ih_count;
int ih_level;
int ih_irq;
char *ih_what;
void *frame;
};
/*
* Low level interrupt dispatcher registration data.
*/
#define NLOWINT 16 /* Number of low level registrations possible */
struct trap_frame;
struct {
intrmask_t int_mask;
intrmask_t (*int_hand)(intrmask_t, struct trap_frame *);
} cpu_int_tab[NLOWINT];
intrmask_t idle_mask;
int last_low_int;
void set_intr(int, intrmask_t, intrmask_t(*)(intrmask_t, struct trap_frame *));
#ifdef IMASK_EXTERNAL
void hw_setintrmask(intrmask_t);
extern void *hwmask_addr;
#endif
/*
* Generic interrupt handling code that can be used for simple
* interrupt hardware models. Functions can also be used by
* more complex code especially the mask calculation code.
*/
void *generic_intr_establish(void *, u_long, int, int,
int (*) __P((void *)), void *, char *);
void generic_intr_disestablish(void *, void *);
void generic_intr_makemasks(void);
void generic_do_pending_int(void);
intrmask_t generic_iointr(intrmask_t, struct trap_frame *);
#endif /* _LOCORE */
#endif /* _MACHINE_INTR_H_ */
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