2 * Definitions used in MIPS MT SMTC "Interprocessor Interrupt" code.
4 #ifndef __ASM_SMTC_IPI_H
5 #define __ASM_SMTC_IPI_H
7 //#define SMTC_IPI_DEBUG
10 #include <asm/mipsregs.h>
11 #include <asm/mipsmtregs.h>
12 #endif /* SMTC_IPI_DEBUG */
19 struct smtc_ipi *flink;
26 #endif /* SMTC_IPI_DEBUG */
33 #define LINUX_SMP_IPI 1
34 #define SMTC_CLOCK_TICK 2
37 * A queue of IPI messages
41 struct smtc_ipi *head;
43 struct smtc_ipi *tail;
47 extern struct smtc_ipi_q IPIQ[NR_CPUS];
48 extern struct smtc_ipi_q freeIPIq;
50 static inline void smtc_ipi_nq(struct smtc_ipi_q *q, struct smtc_ipi *p)
54 spin_lock_irqsave(&q->lock, flags);
56 q->head = q->tail = p;
63 p->sender = read_c0_tcbind();
64 p->stamp = read_c0_count();
65 #endif /* SMTC_IPI_DEBUG */
66 spin_unlock_irqrestore(&q->lock, flags);
69 static inline struct smtc_ipi *smtc_ipi_dq(struct smtc_ipi_q *q)
74 spin_lock_irqsave(&q->lock, flags);
79 q->head = q->head->flink;
81 /* Arguably unnecessary, but leaves queue cleaner */
85 spin_unlock_irqrestore(&q->lock, flags);
89 static inline void smtc_ipi_req(struct smtc_ipi_q *q, struct smtc_ipi *p)
93 spin_lock_irqsave(&q->lock, flags);
94 if (q->head == NULL) {
95 q->head = q->tail = p;
102 spin_unlock_irqrestore(&q->lock, flags);
105 static inline int smtc_ipi_qdepth(struct smtc_ipi_q *q)
110 spin_lock_irqsave(&q->lock, flags);
112 spin_unlock_irqrestore(&q->lock, flags);
116 extern void smtc_send_ipi(int cpu, int type, unsigned int action);
118 #endif /* __ASM_SMTC_IPI_H */