201 lines
4.7 KiB
C
201 lines
4.7 KiB
C
/*
|
|
* NOOP APIC driver.
|
|
*
|
|
* Does almost nothing and should be substituted by a real apic driver via
|
|
* probe routine.
|
|
*
|
|
* Though in case if apic is disabled (for some reason) we try
|
|
* to not uglify the caller's code and allow to call (some) apic routines
|
|
* like self-ipi, etc...
|
|
*/
|
|
|
|
#include <linux/threads.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/mpspec.h>
|
|
#include <asm/apicdef.h>
|
|
#include <asm/apic.h>
|
|
#include <asm/setup.h>
|
|
|
|
#include <linux/smp.h>
|
|
#include <asm/ipi.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <asm/acpi.h>
|
|
#include <asm/e820.h>
|
|
|
|
static void noop_init_apic_ldr(void) { }
|
|
static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
|
|
static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
|
|
static void noop_send_IPI_allbutself(int vector) { }
|
|
static void noop_send_IPI_all(int vector) { }
|
|
static void noop_send_IPI_self(int vector) { }
|
|
static void noop_apic_wait_icr_idle(void) { }
|
|
static void noop_apic_icr_write(u32 low, u32 id) { }
|
|
|
|
static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static u32 noop_safe_apic_wait_icr_idle(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static u64 noop_apic_icr_read(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int noop_cpu_to_logical_apicid(int cpu)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int noop_get_apic_id(unsigned long x)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int noop_probe(void)
|
|
{
|
|
/*
|
|
* NOOP apic should not ever be
|
|
* enabled via probe routine
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int noop_apic_id_registered(void)
|
|
{
|
|
/*
|
|
* if we would be really "pedantic"
|
|
* we should pass read_apic_id() here
|
|
* but since NOOP suppose APIC ID = 0
|
|
* lets save a few cycles
|
|
*/
|
|
return physid_isset(0, phys_cpu_present_map);
|
|
}
|
|
|
|
static const struct cpumask *noop_target_cpus(void)
|
|
{
|
|
/* only BSP here */
|
|
return cpumask_of(0);
|
|
}
|
|
|
|
static unsigned long noop_check_apicid_used(physid_mask_t *map, int apicid)
|
|
{
|
|
return physid_isset(apicid, *map);
|
|
}
|
|
|
|
static unsigned long noop_check_apicid_present(int bit)
|
|
{
|
|
return physid_isset(bit, phys_cpu_present_map);
|
|
}
|
|
|
|
static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
|
|
{
|
|
if (cpu != 0)
|
|
pr_warning("APIC: Vector allocated for non-BSP cpu\n");
|
|
cpumask_clear(retmask);
|
|
cpumask_set_cpu(cpu, retmask);
|
|
}
|
|
|
|
int noop_apicid_to_node(int logical_apicid)
|
|
{
|
|
/* we're always on node 0 */
|
|
return 0;
|
|
}
|
|
|
|
static u32 noop_apic_read(u32 reg)
|
|
{
|
|
WARN_ON_ONCE((cpu_has_apic && !disable_apic));
|
|
return 0;
|
|
}
|
|
|
|
static void noop_apic_write(u32 reg, u32 v)
|
|
{
|
|
WARN_ON_ONCE(cpu_has_apic && !disable_apic);
|
|
}
|
|
|
|
struct apic apic_noop = {
|
|
.name = "noop",
|
|
.probe = noop_probe,
|
|
.acpi_madt_oem_check = NULL,
|
|
|
|
.apic_id_registered = noop_apic_id_registered,
|
|
|
|
.irq_delivery_mode = dest_LowestPrio,
|
|
/* logical delivery broadcast to all CPUs: */
|
|
.irq_dest_mode = 1,
|
|
|
|
.target_cpus = noop_target_cpus,
|
|
.disable_esr = 0,
|
|
.dest_logical = APIC_DEST_LOGICAL,
|
|
.check_apicid_used = noop_check_apicid_used,
|
|
.check_apicid_present = noop_check_apicid_present,
|
|
|
|
.vector_allocation_domain = noop_vector_allocation_domain,
|
|
.init_apic_ldr = noop_init_apic_ldr,
|
|
|
|
.ioapic_phys_id_map = default_ioapic_phys_id_map,
|
|
.setup_apic_routing = NULL,
|
|
.multi_timer_check = NULL,
|
|
.apicid_to_node = noop_apicid_to_node,
|
|
|
|
.cpu_to_logical_apicid = noop_cpu_to_logical_apicid,
|
|
.cpu_present_to_apicid = default_cpu_present_to_apicid,
|
|
.apicid_to_cpu_present = physid_set_mask_of_physid,
|
|
|
|
.setup_portio_remap = NULL,
|
|
.check_phys_apicid_present = default_check_phys_apicid_present,
|
|
.enable_apic_mode = NULL,
|
|
|
|
.phys_pkg_id = noop_phys_pkg_id,
|
|
|
|
.mps_oem_check = NULL,
|
|
|
|
.get_apic_id = noop_get_apic_id,
|
|
.set_apic_id = NULL,
|
|
.apic_id_mask = 0x0F << 24,
|
|
|
|
.cpu_mask_to_apicid = default_cpu_mask_to_apicid,
|
|
.cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
|
|
|
|
.send_IPI_mask = noop_send_IPI_mask,
|
|
.send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
|
|
.send_IPI_allbutself = noop_send_IPI_allbutself,
|
|
.send_IPI_all = noop_send_IPI_all,
|
|
.send_IPI_self = noop_send_IPI_self,
|
|
|
|
.wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
|
|
|
|
/* should be safe */
|
|
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
|
|
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
|
|
|
|
.wait_for_init_deassert = NULL,
|
|
|
|
.smp_callin_clear_local_apic = NULL,
|
|
.inquire_remote_apic = NULL,
|
|
|
|
.read = noop_apic_read,
|
|
.write = noop_apic_write,
|
|
.icr_read = noop_apic_icr_read,
|
|
.icr_write = noop_apic_icr_write,
|
|
.wait_icr_idle = noop_apic_wait_icr_idle,
|
|
.safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
|
|
};
|