diff options
Diffstat (limited to 'sys/amd64/amd64/mp_machdep.c')
| -rw-r--r-- | sys/amd64/amd64/mp_machdep.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c index c65f6f85c549..b7c03d9fb2db 100644 --- a/sys/amd64/amd64/mp_machdep.c +++ b/sys/amd64/amd64/mp_machdep.c @@ -58,6 +58,7 @@ __FBSDID("$FreeBSD$"); #include <machine/apicreg.h> #include <machine/cputypes.h> +#include <machine/cpufunc.h> #include <machine/md_var.h> #include <machine/mp_watchdog.h> #include <machine/pcb.h> @@ -103,6 +104,7 @@ extern pt_entry_t *SMPpt; extern int _udatasel; struct pcb stoppcbs[MAXCPU]; +struct xpcb *stopxpcbs = NULL; /* Variables needed for SMP tlb shootdown. */ vm_offset_t smp_tlb_addr1; @@ -344,6 +346,9 @@ cpu_mp_start(void) /* Install an inter-CPU IPI for CPU stop/restart */ setidt(IPI_STOP, IDTVEC(cpustop), SDT_SYSIGT, SEL_KPL, 0); + /* Install an inter-CPU IPI for CPU suspend/resume */ + setidt(IPI_SUSPEND, IDTVEC(cpususpend), SDT_SYSIGT, SEL_KPL, 0); + /* Set boot_cpu_id if needed. */ if (boot_cpu_id == -1) { boot_cpu_id = PCPU_GET(apic_id); @@ -1145,6 +1150,41 @@ cpustop_handler(void) } /* + * Handle an IPI_SUSPEND by saving our current context and spinning until we + * are resumed. + */ +void +cpususpend_handler(void) +{ + struct savefpu *stopfpu; + register_t cr3, rf; + int cpu = PCPU_GET(cpuid); + int cpumask = PCPU_GET(cpumask); + + rf = intr_disable(); + cr3 = rcr3(); + stopfpu = &stopxpcbs[cpu].xpcb_pcb.pcb_save; + if (savectx2(&stopxpcbs[cpu])) { + fpugetregs(curthread, stopfpu); + wbinvd(); + atomic_set_int(&stopped_cpus, cpumask); + } else + fpusetregs(curthread, stopfpu); + + /* Wait for resume */ + while (!(started_cpus & cpumask)) + ia32_pause(); + + atomic_clear_int(&started_cpus, cpumask); + atomic_clear_int(&stopped_cpus, cpumask); + + /* Restore CR3 and enable interrupts */ + load_cr3(cr3); + lapic_setup(0); + intr_restore(rf); +} + +/* * This is called once the rest of the system is up and running and we're * ready to let the AP's out of the pen. */ |