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Restore the cpu_reset proxy code. It is needed if you want to reset the

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system from an AP at runtime (i.e., calling cpu_reset from ddb).  Someday,
if we move to an NMI for stopping cpus instead, we can do away with this.

Requested by:	jhb
This commit is contained in:
Nate Lawson 2004-12-27 06:15:03 +00:00
parent 2f3f3112c8
commit 4260b00a7c
1 changed files with 41 additions and 1 deletions
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42
sys/i386/i386/vm_machdep.c
View file

@ -100,6 +100,11 @@ __FBSDID("$FreeBSD$");
#endif
static void cpu_reset_real(void);
#ifdef SMP
static void cpu_reset_proxy(void);
static u_int cpu_reset_proxyid;
static volatile u_int cpu_reset_proxy_active;
#endif
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
@ -474,11 +479,26 @@ kvtop(void *addr)
return (pa);
}
#ifdef SMP
static void
cpu_reset_proxy()
{
cpu_reset_proxy_active = 1;
while (cpu_reset_proxy_active == 1)
; /* Wait for other cpu to see that we've started */
stop_cpus((1<<cpu_reset_proxyid));
printf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid);
DELAY(1000000);
cpu_reset_real();
}
#endif
void
cpu_reset()
{
#ifdef SMP
u_int map;
u_int cnt, map;
if (smp_active) {
map = PCPU_GET(other_cpus) & ~stopped_cpus;
@ -486,6 +506,26 @@ cpu_reset()
printf("cpu_reset: Stopping other CPUs\n");
stop_cpus(map);
}
if (PCPU_GET(cpuid) != 0) {
cpu_reset_proxyid = PCPU_GET(cpuid);
cpustop_restartfunc = cpu_reset_proxy;
cpu_reset_proxy_active = 0;
printf("cpu_reset: Restarting BSP\n");
started_cpus = (1<<0); /* Restart CPU #0 */
cnt = 0;
while (cpu_reset_proxy_active == 0 && cnt < 10000000)
cnt++; /* Wait for BSP to announce restart */
if (cpu_reset_proxy_active == 0)
printf("cpu_reset: Failed to restart BSP\n");
enable_intr();
cpu_reset_proxy_active = 2;
while (1);
/* NOTREACHED */
}
DELAY(1000000);
}
#endif