--- /dev/null
+/*
+ * 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... and issue a warning if an operation is not allowed
+ */
+
+#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>
+
+/*
+ * some operations should never be reached with
+ * noop apic if it's not turned off, this mostly
+ * means the caller forgot to disable apic (or
+ * check the apic presence) before doing a call
+ */
+static void warn_apic_enabled(void)
+{
+ WARN_ONCE((cpu_has_apic || !disable_apic),
+ "APIC: Called for NOOP operation with apic enabled\n");
+}
+
+/*
+ * To check operations but do not bloat source code
+ */
+#define NOOP_FUNC(func) func { warn_apic_enabled(); }
+#define NOOP_FUNC_RET(func, ret) func { warn_apic_enabled(); return ret; }
+
+NOOP_FUNC(static void noop_init_apic_ldr(void))
+NOOP_FUNC(static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector))
+NOOP_FUNC(static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector))
+NOOP_FUNC(static void noop_send_IPI_allbutself(int vector))
+NOOP_FUNC(static void noop_send_IPI_all(int vector))
+NOOP_FUNC(static void noop_send_IPI_self(int vector))
+NOOP_FUNC_RET(static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip), -1)
+NOOP_FUNC(static void noop_apic_write(u32 reg, u32 v))
+NOOP_FUNC(void noop_apic_wait_icr_idle(void))
+NOOP_FUNC_RET(static u32 noop_safe_apic_wait_icr_idle(void), 0)
+NOOP_FUNC_RET(static u64 noop_apic_icr_read(void), 0)
+NOOP_FUNC(static void noop_apic_icr_write(u32 low, u32 id))
+NOOP_FUNC_RET(static physid_mask_t noop_ioapic_phys_id_map(physid_mask_t phys_map), phys_map)
+NOOP_FUNC_RET(static int noop_cpu_to_logical_apicid(int cpu), 1)
+NOOP_FUNC_RET(static int noop_default_phys_pkg_id(int cpuid_apic, int index_msb), 0)
+NOOP_FUNC_RET(static unsigned int noop_get_apic_id(unsigned long x), 0)
+
+static int noop_probe(void)
+{
+ /* should not ever be enabled this way */
+ return 0;
+}
+
+static int noop_apic_id_registered(void)
+{
+ warn_apic_enabled();
+ return physid_isset(read_apic_id(), phys_cpu_present_map);
+}
+
+static const struct cpumask *noop_target_cpus(void)
+{
+ warn_apic_enabled();
+
+ /* only BSP here */
+ return cpumask_of(0);
+}
+
+static unsigned long noop_check_apicid_used(physid_mask_t bitmap, int apicid)
+{
+ warn_apic_enabled();
+ return physid_isset(apicid, bitmap);
+}
+
+static unsigned long noop_check_apicid_present(int bit)
+{
+ warn_apic_enabled();
+ return physid_isset(bit, phys_cpu_present_map);
+}
+
+static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
+{
+ warn_apic_enabled();
+ 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)
+{
+ warn_apic_enabled();
+
+ /* we're always on node 0 */
+ return 0;
+}
+
+static u32 noop_apic_read(u32 reg)
+{
+ /*
+ * noop-read is always safe until we have
+ * non-disabled unit
+ */
+ WARN_ON_ONCE((cpu_has_apic && !disable_apic));
+ return 0;
+}
+
+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 = noop_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 = default_apicid_to_cpu_present,
+
+ .setup_portio_remap = NULL,
+ .check_phys_apicid_present = default_check_phys_apicid_present,
+ .enable_apic_mode = NULL,
+
+ .phys_pkg_id = noop_default_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,
+};
projects / lisovros / linux_canprio.git / commitdiff