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      1 #ifndef __ASM_IO_APIC_H
      2 #define __ASM_IO_APIC_H
      3 
      4 #include <asm/types.h>
      5 #include <asm/mpspec.h>
      6 #include <asm/apicdef.h>
      7 
      8 /*
      9  * Intel IO-APIC support for SMP and UP systems.
     10  *
     11  * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
     12  */
     13 
     14 /*
     15  * The structure of the IO-APIC:
     16  */
     17 union IO_APIC_reg_00 {
     18 	u32	raw;
     19 	struct {
     20 		u32	__reserved_2	: 14,
     21 			LTS		:  1,
     22 			delivery_type	:  1,
     23 			__reserved_1	:  8,
     24 			ID		:  8;
     25 	} __attribute__ ((packed)) bits;
     26 };
     27 
     28 union IO_APIC_reg_01 {
     29 	u32	raw;
     30 	struct {
     31 		u32	version		:  8,
     32 			__reserved_2	:  7,
     33 			PRQ		:  1,
     34 			entries		:  8,
     35 			__reserved_1	:  8;
     36 	} __attribute__ ((packed)) bits;
     37 };
     38 
     39 union IO_APIC_reg_02 {
     40 	u32	raw;
     41 	struct {
     42 		u32	__reserved_2	: 24,
     43 			arbitration	:  4,
     44 			__reserved_1	:  4;
     45 	} __attribute__ ((packed)) bits;
     46 };
     47 
     48 union IO_APIC_reg_03 {
     49 	u32	raw;
     50 	struct {
     51 		u32	boot_DT		:  1,
     52 			__reserved_1	: 31;
     53 	} __attribute__ ((packed)) bits;
     54 };
     55 
     56 enum ioapic_irq_destination_types {
     57 	dest_Fixed = 0,
     58 	dest_LowestPrio = 1,
     59 	dest_SMI = 2,
     60 	dest__reserved_1 = 3,
     61 	dest_NMI = 4,
     62 	dest_INIT = 5,
     63 	dest__reserved_2 = 6,
     64 	dest_ExtINT = 7
     65 };
     66 
     67 struct IO_APIC_route_entry {
     68 	__u32	vector		:  8,
     69 		delivery_mode	:  3,	/* 000: FIXED
     70 					 * 001: lowest prio
     71 					 * 111: ExtINT
     72 					 */
     73 		dest_mode	:  1,	/* 0: physical, 1: logical */
     74 		delivery_status	:  1,
     75 		polarity	:  1,
     76 		irr		:  1,
     77 		trigger		:  1,	/* 0: edge, 1: level */
     78 		mask		:  1,	/* 0: enabled, 1: disabled */
     79 		__reserved_2	: 15;
     80 
     81 	union {		struct { __u32
     82 					__reserved_1	: 24,
     83 					physical_dest	:  4,
     84 					__reserved_2	:  4;
     85 			} physical;
     86 
     87 			struct { __u32
     88 					__reserved_1	: 24,
     89 					logical_dest	:  8;
     90 			} logical;
     91 	} dest;
     92 
     93 } __attribute__ ((packed));
     94 
     95 #ifdef CONFIG_X86_IO_APIC
     96 
     97 /*
     98  * # of IO-APICs and # of IRQ routing registers
     99  */
    100 extern int nr_ioapics;
    101 extern int nr_ioapic_registers[MAX_IO_APICS];
    102 
    103 /*
    104  * MP-BIOS irq configuration table structures:
    105  */
    106 
    107 /* I/O APIC entries */
    108 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
    109 
    110 /* # of MP IRQ source entries */
    111 extern int mp_irq_entries;
    112 
    113 /* MP IRQ source entries */
    114 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
    115 
    116 /* non-0 if default (table-less) MP configuration */
    117 extern int mpc_default_type;
    118 
    119 /* Older SiS APIC requires we rewrite the index register */
    120 extern int sis_apic_bug;
    121 
    122 /* 1 if "noapic" boot option passed */
    123 extern int skip_ioapic_setup;
    124 
    125 static inline void disable_ioapic_setup(void)
    126 {
    127 	skip_ioapic_setup = 1;
    128 }
    129 
    130 static inline int ioapic_setup_disabled(void)
    131 {
    132 	return skip_ioapic_setup;
    133 }
    134 
    135 /*
    136  * If we use the IO-APIC for IRQ routing, disable automatic
    137  * assignment of PCI IRQ's.
    138  */
    139 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
    140 
    141 #ifdef CONFIG_ACPI
    142 extern int io_apic_get_unique_id (int ioapic, int apic_id);
    143 extern int io_apic_get_version (int ioapic);
    144 extern int io_apic_get_redir_entries (int ioapic);
    145 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low);
    146 extern int timer_uses_ioapic_pin_0;
    147 #endif /* CONFIG_ACPI */
    148 
    149 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
    150 
    151 #else  /* !CONFIG_X86_IO_APIC */
    152 #define io_apic_assign_pci_irqs 0
    153 #endif
    154 
    155 #endif
    156