SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/x86/kernel/apic/apic_noop.c

   1 /*
   2  * NOOP APIC driver.
   3  *
   4  * Does almost nothing and should be substituted by a real apic driver via
   5  * probe routine.
   6  *
   7  * Though in case if apic is disabled (for some reason) we try
   8  * to not uglify the caller's code and allow to call (some) apic routines
   9  * like self-ipi, etc... and issue a warning if an operation is not allowed
  10  */
  11
  12 #include <linux/threads.h>
  13 #include <linux/cpumask.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16 #include <linux/kernel.h>
  17 #include <linux/ctype.h>
  18 #include <linux/init.h>
  19 #include <linux/errno.h>
  20 #include <asm/fixmap.h>
  21 #include <asm/mpspec.h>
  22 #include <asm/apicdef.h>
  23 #include <asm/apic.h>
  24 #include <asm/setup.h>
  25
  26 #include <linux/smp.h>
  27 #include <asm/ipi.h>
  28
  29 #include <linux/interrupt.h>
  30 #include <asm/acpi.h>
  31 #include <asm/e820.h>
  32
  33 /*
  34  * some operations should never be reached with
  35  * noop apic if it's not turned off, this mostly
  36  * means the caller forgot to disable apic (or
  37  * check the apic presence) before doing a call
  38  */
  39 static void warn_apic_enabled(void)
  40 {
  41         WARN_ONCE((cpu_has_apic || !disable_apic),
  42                 "APIC: Called for NOOP operation with apic enabled\n");
  43 }
  44
  45 /*
  46  * To check operations but do not bloat source code
  47  */
  48 #define NOOP_FUNC(func)                 func { warn_apic_enabled(); }
  49 #define NOOP_FUNC_RET(func, ret)        func { warn_apic_enabled(); return ret; }
  50
  51 NOOP_FUNC(static void noop_init_apic_ldr(void))
  52 NOOP_FUNC(static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector))
  53 NOOP_FUNC(static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector))
  54 NOOP_FUNC(static void noop_send_IPI_allbutself(int vector))
  55 NOOP_FUNC(static void noop_send_IPI_all(int vector))
  56 NOOP_FUNC(static void noop_send_IPI_self(int vector))
  57 NOOP_FUNC_RET(static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip), -1)
  58 NOOP_FUNC(static void noop_apic_write(u32 reg, u32 v))
  59 NOOP_FUNC(void noop_apic_wait_icr_idle(void))
  60 NOOP_FUNC_RET(static u32 noop_safe_apic_wait_icr_idle(void), 0)
  61 NOOP_FUNC_RET(static u64 noop_apic_icr_read(void), 0)
  62 NOOP_FUNC(static void noop_apic_icr_write(u32 low, u32 id))
  63 NOOP_FUNC_RET(static physid_mask_t noop_ioapic_phys_id_map(physid_mask_t phys_map), phys_map)
  64 NOOP_FUNC_RET(static int noop_cpu_to_logical_apicid(int cpu), 1)
  65 NOOP_FUNC_RET(static int noop_default_phys_pkg_id(int cpuid_apic, int index_msb), 0)
  66 NOOP_FUNC_RET(static unsigned int noop_get_apic_id(unsigned long x), 0)
  67
  68 static int noop_probe(void)
  69 {
  70         /* should not ever be enabled this way */
  71         return 0;
  72 }
  73
  74 static int noop_apic_id_registered(void)
  75 {
  76         warn_apic_enabled();
  77         return physid_isset(read_apic_id(), phys_cpu_present_map);
  78 }
  79
  80 static const struct cpumask *noop_target_cpus(void)
  81 {
  82         warn_apic_enabled();
  83
  84         /* only BSP here */
  85         return cpumask_of(0);
  86 }
  87
  88 static unsigned long noop_check_apicid_used(physid_mask_t bitmap, int apicid)
  89 {
  90         warn_apic_enabled();
  91         return physid_isset(apicid, bitmap);
  92 }
  93
  94 static unsigned long noop_check_apicid_present(int bit)
  95 {
  96         warn_apic_enabled();
  97         return physid_isset(bit, phys_cpu_present_map);
  98 }
  99
 100 static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
 101 {
 102         warn_apic_enabled();
 103         if (cpu != 0)
 104                 pr_warning("APIC: Vector allocated for non-BSP cpu\n");
 105         cpumask_clear(retmask);
 106         cpumask_set_cpu(cpu, retmask);
 107 }
 108
 109 int noop_apicid_to_node(int logical_apicid)
 110 {
 111         warn_apic_enabled();
 112
 113         /* we're always on node 0 */
 114         return 0;
 115 }
 116
 117 static u32 noop_apic_read(u32 reg)
 118 {
 119         /*
 120          * noop-read is always safe until we have
 121          * non-disabled unit
 122          */
 123         WARN_ON_ONCE((cpu_has_apic && !disable_apic));
 124         return 0;
 125 }
 126
 127 struct apic apic_noop = {
 128         .name                           = "noop",
 129         .probe                          = noop_probe,
 130         .acpi_madt_oem_check            = NULL,
 131
 132         .apic_id_registered             = noop_apic_id_registered,
 133
 134         .irq_delivery_mode              = dest_LowestPrio,
 135         /* logical delivery broadcast to all CPUs: */
 136         .irq_dest_mode                  = 1,
 137
 138         .target_cpus                    = noop_target_cpus,
 139         .disable_esr                    = 0,
 140         .dest_logical                   = APIC_DEST_LOGICAL,
 141         .check_apicid_used              = noop_check_apicid_used,
 142         .check_apicid_present           = noop_check_apicid_present,
 143
 144         .vector_allocation_domain       = noop_vector_allocation_domain,
 145         .init_apic_ldr                  = noop_init_apic_ldr,
 146
 147         .ioapic_phys_id_map             = noop_ioapic_phys_id_map,
 148         .setup_apic_routing             = NULL,
 149         .multi_timer_check              = NULL,
 150         .apicid_to_node                 = noop_apicid_to_node,
 151
 152         .cpu_to_logical_apicid          = noop_cpu_to_logical_apicid,
 153         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 154         .apicid_to_cpu_present          = default_apicid_to_cpu_present,
 155
 156         .setup_portio_remap             = NULL,
 157         .check_phys_apicid_present      = default_check_phys_apicid_present,
 158         .enable_apic_mode               = NULL,
 159
 160         .phys_pkg_id                    = noop_default_phys_pkg_id,
 161
 162         .mps_oem_check                  = NULL,
 163
 164         .get_apic_id                    = noop_get_apic_id,
 165         .set_apic_id                    = NULL,
 166         .apic_id_mask                   = 0x0F << 24,
 167
 168         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 169         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 170
 171         .send_IPI_mask                  = noop_send_IPI_mask,
 172         .send_IPI_mask_allbutself       = noop_send_IPI_mask_allbutself,
 173         .send_IPI_allbutself            = noop_send_IPI_allbutself,
 174         .send_IPI_all                   = noop_send_IPI_all,
 175         .send_IPI_self                  = noop_send_IPI_self,
 176
 177         .wakeup_secondary_cpu           = noop_wakeup_secondary_cpu,
 178
 179         /* should be safe */
 180         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 181         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 182
 183         .wait_for_init_deassert         = NULL,
 184
 185         .smp_callin_clear_local_apic    = NULL,
 186         .inquire_remote_apic            = NULL,
 187
 188         .read                           = noop_apic_read,
 189         .write                          = noop_apic_write,
 190         .icr_read                       = noop_apic_icr_read,
 191         .icr_write                      = noop_apic_icr_write,
 192         .wait_icr_idle                  = noop_apic_wait_icr_idle,
 193         .safe_wait_icr_idle             = noop_safe_apic_wait_icr_idle,
 194 };