Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / x86 / kernel / apic / apic_noop.c

diff --git a/kernel/arch/x86/kernel/apic/apic_noop.c b/kernel/arch/x86/kernel/apic/apic_noop.c
new file mode 100644 (file)
index 0000000..b205cdb
--- /dev/null
+++ b/kernel/arch/x86/kernel/apic/apic_noop.c
@@ -0,0 +1,169 @@
+/*
+ * 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/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_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 void noop_vector_allocation_domain(int cpu, struct cpumask *retmask,
+                                         const struct cpumask *mask)
+{
+       if (cpu != 0)
+               pr_warning("APIC: Vector allocated for non-BSP cpu\n");
+       cpumask_copy(retmask, cpumask_of(cpu));
+}
+
+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_valid                  = default_apic_id_valid,
+       .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              = default_check_apicid_used,
+
+       .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,
+
+       .cpu_present_to_apicid          = default_cpu_present_to_apicid,
+       .apicid_to_cpu_present          = physid_set_mask_of_physid,
+
+       .check_phys_apicid_present      = default_check_phys_apicid_present,
+
+       .phys_pkg_id                    = noop_phys_pkg_id,
+
+       .get_apic_id                    = noop_get_apic_id,
+       .set_apic_id                    = NULL,
+       .apic_id_mask                   = 0x0F << 24,
+
+       .cpu_mask_to_apicid_and         = flat_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,
+
+       .wait_for_init_deassert         = false,
+       .inquire_remote_apic            = NULL,
+
+       .read                           = noop_apic_read,
+       .write                          = noop_apic_write,
+       .eoi_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,
+
+#ifdef CONFIG_X86_32
+       .x86_32_early_logical_apicid    = noop_x86_32_early_logical_apicid,
+#endif
+};