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Rev | Author | Line No. | Line |
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424 | giacomo | 1 | /* |
2 | * This file should contain #defines for all of the interrupt vector |
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3 | * numbers used by this architecture. |
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4 | * |
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5 | * In addition, there are some standard defines: |
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6 | * |
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7 | * FIRST_EXTERNAL_VECTOR: |
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8 | * The first free place for external interrupts |
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9 | * |
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10 | * SYSCALL_VECTOR: |
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11 | * The IRQ vector a syscall makes the user to kernel transition |
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12 | * under. |
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13 | * |
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14 | * TIMER_IRQ: |
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15 | * The IRQ number the timer interrupt comes in at. |
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16 | * |
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17 | * NR_IRQS: |
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18 | * The total number of interrupt vectors (including all the |
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19 | * architecture specific interrupts) needed. |
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20 | * |
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21 | */ |
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22 | #ifndef _ASM_IRQ_VECTORS_H |
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23 | #define _ASM_IRQ_VECTORS_H |
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24 | |||
25 | /* |
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26 | * IDT vectors usable for external interrupt sources start |
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27 | * at 0x20: |
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28 | */ |
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29 | #define FIRST_EXTERNAL_VECTOR 0x20 |
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30 | |||
31 | #define SYSCALL_VECTOR 0x80 |
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32 | |||
33 | /* |
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34 | * Vectors 0x20-0x2f are used for ISA interrupts. |
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35 | */ |
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36 | |||
37 | /* |
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38 | * Special IRQ vectors used by the SMP architecture, 0xf0-0xff |
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39 | * |
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40 | * some of the following vectors are 'rare', they are merged |
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41 | * into a single vector (CALL_FUNCTION_VECTOR) to save vector space. |
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42 | * TLB, reschedule and local APIC vectors are performance-critical. |
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43 | * |
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44 | * Vectors 0xf0-0xfa are free (reserved for future Linux use). |
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45 | */ |
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46 | #define SPURIOUS_APIC_VECTOR 0xff |
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47 | #define ERROR_APIC_VECTOR 0xfe |
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48 | #define INVALIDATE_TLB_VECTOR 0xfd |
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49 | #define RESCHEDULE_VECTOR 0xfc |
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50 | #define CALL_FUNCTION_VECTOR 0xfb |
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51 | |||
52 | #define THERMAL_APIC_VECTOR 0xf0 |
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53 | /* |
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54 | * Local APIC timer IRQ vector is on a different priority level, |
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55 | * to work around the 'lost local interrupt if more than 2 IRQ |
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56 | * sources per level' errata. |
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57 | */ |
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58 | #define LOCAL_TIMER_VECTOR 0xef |
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59 | |||
60 | /* |
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61 | * First APIC vector available to drivers: (vectors 0x30-0xee) |
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62 | * we start at 0x31 to spread out vectors evenly between priority |
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63 | * levels. (0x80 is the syscall vector) |
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64 | */ |
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65 | #define FIRST_DEVICE_VECTOR 0x31 |
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66 | #define FIRST_SYSTEM_VECTOR 0xef |
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67 | |||
68 | #define TIMER_IRQ 0 |
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69 | |||
70 | /* |
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71 | * 16 8259A IRQ's, 208 potential APIC interrupt sources. |
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72 | * Right now the APIC is mostly only used for SMP. |
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73 | * 256 vectors is an architectural limit. (we can have |
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74 | * more than 256 devices theoretically, but they will |
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75 | * have to use shared interrupts) |
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76 | * Since vectors 0x00-0x1f are used/reserved for the CPU, |
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77 | * the usable vector space is 0x20-0xff (224 vectors) |
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78 | */ |
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79 | #ifdef CONFIG_X86_IO_APIC |
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80 | #define NR_IRQS 224 |
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81 | # if (224 >= 32 * NR_CPUS) |
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82 | # define NR_IRQ_VECTORS NR_IRQS |
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83 | # else |
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84 | # define NR_IRQ_VECTORS (32 * NR_CPUS) |
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85 | # endif |
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86 | #else |
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87 | #define NR_IRQS 16 |
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88 | #define NR_IRQ_VECTORS NR_IRQS |
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89 | #endif |
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90 | |||
91 | #define FPU_IRQ 13 |
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92 | |||
93 | #define FIRST_VM86_IRQ 3 |
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94 | #define LAST_VM86_IRQ 15 |
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95 | #define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15) |
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96 | |||
97 | |||
98 | #endif /* _ASM_IRQ_VECTORS_H */ |