1 #ifndef __ASM_IO_APIC_H
2 #define __ASM_IO_APIC_H
4 #include <linux/config.h>
6 #include <asm/mpspec.h>
9 * Intel IO-APIC support for SMP and UP systems.
11 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
14 #ifdef CONFIG_X86_IO_APIC
17 static inline int use_pci_vector(void) {return 1;}
18 static inline void disable_edge_ioapic_vector(unsigned int vector) { }
19 static inline void mask_and_ack_level_ioapic_vector(unsigned int vector) { }
20 static inline void end_edge_ioapic_vector (unsigned int vector) { }
21 #define startup_level_ioapic startup_level_ioapic_vector
22 #define shutdown_level_ioapic mask_IO_APIC_vector
23 #define enable_level_ioapic unmask_IO_APIC_vector
24 #define disable_level_ioapic mask_IO_APIC_vector
25 #define mask_and_ack_level_ioapic mask_and_ack_level_ioapic_vector
26 #define end_level_ioapic end_level_ioapic_vector
27 #define set_ioapic_affinity set_ioapic_affinity_vector
29 #define startup_edge_ioapic startup_edge_ioapic_vector
30 #define shutdown_edge_ioapic disable_edge_ioapic_vector
31 #define enable_edge_ioapic unmask_IO_APIC_vector
32 #define disable_edge_ioapic disable_edge_ioapic_vector
33 #define ack_edge_ioapic ack_edge_ioapic_vector
34 #define end_edge_ioapic end_edge_ioapic_vector
36 static inline int use_pci_vector(void) {return 0;}
37 static inline void disable_edge_ioapic_irq(unsigned int irq) { }
38 static inline void mask_and_ack_level_ioapic_irq(unsigned int irq) { }
39 static inline void end_edge_ioapic_irq (unsigned int irq) { }
40 #define startup_level_ioapic startup_level_ioapic_irq
41 #define shutdown_level_ioapic mask_IO_APIC_irq
42 #define enable_level_ioapic unmask_IO_APIC_irq
43 #define disable_level_ioapic mask_IO_APIC_irq
44 #define mask_and_ack_level_ioapic mask_and_ack_level_ioapic_irq
45 #define end_level_ioapic end_level_ioapic_irq
46 #define set_ioapic_affinity set_ioapic_affinity_irq
48 #define startup_edge_ioapic startup_edge_ioapic_irq
49 #define shutdown_edge_ioapic disable_edge_ioapic_irq
50 #define enable_edge_ioapic unmask_IO_APIC_irq
51 #define disable_edge_ioapic disable_edge_ioapic_irq
52 #define ack_edge_ioapic ack_edge_ioapic_irq
53 #define end_edge_ioapic end_edge_ioapic_irq
56 #define APIC_MISMATCH_DEBUG
58 #define IO_APIC_BASE(idx) \
59 ((volatile int *)(__fix_to_virt(FIX_IO_APIC_BASE_0 + idx) \
60 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK)))
63 * The structure of the IO-APIC:
65 union IO_APIC_reg_00 {
68 u32 __reserved_2 : 14,
73 } __attribute__ ((packed)) bits;
76 union IO_APIC_reg_01 {
84 } __attribute__ ((packed)) bits;
87 union IO_APIC_reg_02 {
90 u32 __reserved_2 : 24,
93 } __attribute__ ((packed)) bits;
96 union IO_APIC_reg_03 {
101 } __attribute__ ((packed)) bits;
105 * # of IO-APICs and # of IRQ routing registers
107 extern int nr_ioapics;
108 extern int nr_ioapic_registers[MAX_IO_APICS];
110 enum ioapic_irq_destination_types {
114 dest__reserved_1 = 3,
117 dest__reserved_2 = 6,
121 struct IO_APIC_route_entry {
123 delivery_mode : 3, /* 000: FIXED
127 dest_mode : 1, /* 0: physical, 1: logical */
131 trigger : 1, /* 0: edge, 1: level */
132 mask : 1, /* 0: enabled, 1: disabled */
135 union { struct { __u32
147 } __attribute__ ((packed));
150 * MP-BIOS irq configuration table structures:
153 /* I/O APIC entries */
154 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
156 /* # of MP IRQ source entries */
157 extern int mp_irq_entries;
159 /* MP IRQ source entries */
160 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
162 /* non-0 if default (table-less) MP configuration */
163 extern int mpc_default_type;
165 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
167 *IO_APIC_BASE(apic) = reg;
168 return *(IO_APIC_BASE(apic)+4);
171 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
173 *IO_APIC_BASE(apic) = reg;
174 *(IO_APIC_BASE(apic)+4) = value;
178 * Re-write a value: to be used for read-modify-write
179 * cycles where the read already set up the index register.
181 static inline void io_apic_modify(unsigned int apic, unsigned int value)
183 *(IO_APIC_BASE(apic)+4) = value;
187 * Synchronize the IO-APIC and the CPU by doing
188 * a dummy read from the IO-APIC
190 static inline void io_apic_sync(unsigned int apic)
192 (void) *(IO_APIC_BASE(apic)+4);
195 /* 1 if "noapic" boot option passed */
196 extern int skip_ioapic_setup;
199 * If we use the IO-APIC for IRQ routing, disable automatic
200 * assignment of PCI IRQ's.
202 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
205 extern int io_apic_get_version (int ioapic);
206 extern int io_apic_get_redir_entries (int ioapic);
207 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int, int);
210 extern int sis_apic_bug; /* dummy */
212 #else /* !CONFIG_X86_IO_APIC */
213 #define io_apic_assign_pci_irqs 0
216 extern int assign_irq_vector(int irq);
218 void enable_NMI_through_LVT0 (void * dummy);
220 extern spinlock_t i8259A_lock;