/*
* spl0:
*
* Lower interrupt priority to IPL 0 -- must check for
* software interrupts.
*/
void
spl0(void)
{
if (ssir) {
(void) alpha_pal_swpipl(ALPHA_PSL_IPL_SOFT);
softintr_dispatch();
}
(void) alpha_pal_swpipl(ALPHA_PSL_IPL_0);
}
void
splassert_check(int wantipl, const char *func)
{
int curipl = alpha_pal_rdps() & ALPHA_PSL_IPL_MASK;
/*
* Tell soft interrupts apart from regular levels.
*/
if (wantipl < 0)
wantipl = IPL_SOFTINT;
/*
* Depending on the system, hardware interrupts may occur either
* at level 3 or level 4. Avoid false positives in the former case.
*/
if (curipl == ALPHA_PSL_IPL_IO - 1)
curipl = ALPHA_PSL_IPL_IO;
if (curipl < wantipl) {
splassert_fail(wantipl, curipl, func);
/*
* If splassert_ctl is set to not panic, raise the ipl
* in a feeble attempt to reduce damage.
*/
alpha_pal_swpipl(wantipl);
}
}
/*
* softintr_dispatch:
*
* Process pending software interrupts.
*/
void
softintr_dispatch()
{
struct alpha_soft_intr *asi;
struct alpha_soft_intrhand *sih;
u_int64_t n, i;
while ((n = atomic_loadlatch_ulong(&ssir, 0)) != 0) {
for (i = 0; i < SI_NSOFT; i++) {
if ((n & (1 << i)) == 0)
continue;
asi = &alpha_soft_intrs[i];
for (;;) {
(void) alpha_pal_swpipl(ALPHA_PSL_IPL_HIGH);
simple_lock(&asi->softintr_slock);
sih = TAILQ_FIRST(&asi->softintr_q);
if (sih != NULL) {
TAILQ_REMOVE(&asi->softintr_q, sih,
sih_q);
sih->sih_pending = 0;
}
simple_unlock(&asi->softintr_slock);
(void) alpha_pal_swpipl(ALPHA_PSL_IPL_SOFT);
if (sih == NULL)
break;
uvmexp.softs++;
(*sih->sih_fn)(sih->sih_arg);
}
}
}
}
/*
* cpu_configure:
* called at boot time, configure all devices on system
*/
void
cpu_configure()
{
parse_prom_bootdev();
softintr_init();
/*
* Disable interrupts during autoconfiguration. splhigh() won't
* work, because it simply _raises_ the IPL, so if machine checks
* are disabled, they'll stay disabled. Machine checks are needed
* during autoconfig.
*/
(void)alpha_pal_swpipl(ALPHA_PSL_IPL_HIGH);
if (config_rootfound("mainbus", "mainbus") == NULL)
panic("no mainbus found");
(void)spl0();
hwrpb_restart_setup();
cold = 0;
}
/*
* cpu_configure:
* called at boot time, configure all devices on system
*/
void
cpu_configure(void)
{
parse_prom_bootdev();
/*
* Disable interrupts during autoconfiguration. splhigh() won't
* work, because it simply _raises_ the IPL, so if machine checks
* are disabled, they'll stay disabled. Machine checks are needed
* during autoconfig.
*/
(void)alpha_pal_swpipl(ALPHA_PSL_IPL_HIGH);
if (config_rootfound("mainbus", NULL) == NULL)
panic("no mainbus found");
(void)spl0();
/*
* Note that bootstrapping is finished, and set the HWRPB up
* to do restarts.
*/
hwrpb_restart_setup();
}
int
_splraise(int s)
{
int cur = alpha_pal_rdps() & ALPHA_PSL_IPL_MASK;
return (s > cur ? alpha_pal_swpipl(s) : cur);
}
