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/*
* Copyright (C) 2007-2009 Free Software Foundation
*
* This program is free software ; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation ; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY ; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the program ; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sys/types.h>
#include <string.h>
#include <mach/xen.h>
#include <machine/xen.h>
#include <machine/ipl.h>
#include <machine/gdt.h>
#include <xen/console.h>
#include "evt.h"
#define NEVNT (sizeof(unsigned long) * sizeof(unsigned long) * 8)
int int_mask[NSPL];
spl_t curr_ipl;
void (*ivect[NEVNT])();
int intpri[NEVNT];
int iunit[NEVNT];
void hyp_c_callback(void *ret_addr, void *regs)
{
int i, j, n;
int cpu = 0;
unsigned long pending_sel;
hyp_shared_info.vcpu_info[cpu].evtchn_upcall_pending = 0;
/* no need for a barrier on x86, xchg is already one */
#if !(defined(__i386__) || defined(__x86_64__))
wmb();
#endif
while ((pending_sel = xchgl(&hyp_shared_info.vcpu_info[cpu].evtchn_pending_sel, 0))) {
for (i = 0; pending_sel; i++, pending_sel >>= 1) {
unsigned long pending;
if (!(pending_sel & 1))
continue;
while ((pending = (hyp_shared_info.evtchn_pending[i] & ~hyp_shared_info.evtchn_mask[i]))) {
n = i * sizeof(unsigned long);
for (j = 0; pending; j++, n++, pending >>= 1) {
if (!(pending & 1))
continue;
if (ivect[n]) {
spl_t spl = splx(intpri[n]);
asm ("lock; and %1,%0":"=m"(hyp_shared_info.evtchn_pending[i]):"r"(~(1UL<<j)));
ivect[n](iunit[n], spl, ret_addr, regs);
splx_cli(spl);
} else {
printf("warning: lost unbound event %d\n", n);
asm ("lock; and %1,%0":"=m"(hyp_shared_info.evtchn_pending[i]):"r"(~(1UL<<j)));
}
}
}
}
}
}
void form_int_mask(void)
{
unsigned int i, j, bit, mask;
for (i=SPL0; i < NSPL; i++) {
for (j=0x00, bit=0x01, mask = 0; j < NEVNT; j++, bit<<=1)
if (intpri[j] <= i)
mask |= bit;
int_mask[i] = mask;
}
}
extern void hyp_callback(void);
extern void hyp_failsafe_callback(void);
void hyp_intrinit() {
form_int_mask();
curr_ipl = SPLHI;
hyp_shared_info.evtchn_mask[0] = int_mask[SPLHI];
hyp_set_callbacks(KERNEL_CS, hyp_callback,
KERNEL_CS, hyp_failsafe_callback);
}
void hyp_evt_handler(evtchn_port_t port, void (*handler)(), int unit, spl_t spl) {
if (port > NEVNT)
panic("event channel port %d > %d not supported\n", port, NEVNT);
intpri[port] = spl;
iunit[port] = unit;
form_int_mask();
wmb();
ivect[port] = handler;
}
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