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https://github.com/xen-project/xen.git
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kaf24@firebug.cl.cam.ac.uk
cdb8b09f6b
to simplify the porting. 64 bit version of Mini-os now compiles, but does not work because of the pagetables and some bits of scheduler not being written. Signed-off-by: Grzegorz Milos <gm281@cam.ac.uk>
112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*-
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****************************************************************************
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* (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
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* (C) 2005 - Grzegorz Milos - Intel Research Cambridge
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****************************************************************************
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*
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* File: events.c
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* Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
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* Changes: Grzegorz Milos (gm281@cam.ac.uk)
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*
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* Date: Jul 2003, changes Jun 2005
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*
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* Environment: Xen Minimal OS
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* Description: Deals with events recieved on event channels
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*
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****************************************************************************
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*/
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#include <os.h>
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#include <mm.h>
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#include <hypervisor.h>
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#include <events.h>
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#include <lib.h>
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static ev_action_t ev_actions[NR_EVS];
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void default_handler(int port, struct pt_regs *regs);
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/*
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* Demux events to different handlers.
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*/
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int do_event(u32 port, struct pt_regs *regs)
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{
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ev_action_t *action;
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if (port >= NR_EVS) {
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printk("Port number too large: %d\n", port);
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return 0;
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}
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action = &ev_actions[port];
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action->count++;
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if (!action->handler)
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goto out;
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if (action->status & EVS_DISABLED)
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goto out;
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/* call the handler */
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action->handler(port, regs);
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clear_evtchn(port);
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out:
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return 1;
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}
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void bind_evtchn( u32 port, void (*handler)(int, struct pt_regs *) )
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{
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if(ev_actions[port].handler)
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printk("WARN: Handler for port %d already registered, replacing\n",
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port);
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ev_actions[port].handler = handler;
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ev_actions[port].status &= ~EVS_DISABLED;
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/* Finally unmask the port */
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unmask_evtchn(port);
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}
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int bind_virq( u32 virq, void (*handler)(int, struct pt_regs *) )
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{
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evtchn_op_t op;
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int ret = 0;
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/* Try to bind the virq to a port */
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op.cmd = EVTCHNOP_bind_virq;
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op.u.bind_virq.virq = virq;
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if ( HYPERVISOR_event_channel_op(&op) != 0 )
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{
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ret = 1;
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printk("Failed to bind virtual IRQ %d\n", virq);
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goto out;
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}
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bind_evtchn(op.u.bind_virq.port, handler);
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out:
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return ret;
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}
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/*
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* Initially all events are without a handler and disabled
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*/
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void init_events(void)
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{
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int i;
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/* inintialise event handler */
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for ( i = 0; i < NR_EVS; i++ )
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{
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ev_actions[i].status = EVS_DISABLED;
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ev_actions[i].handler = default_handler;
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}
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}
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void default_handler(int port, struct pt_regs *regs) {
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printk("[Port %d] - event received\n", port);
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}
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