107 lines
4.1 KiB
C
107 lines
4.1 KiB
C
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/* The system call implemented in this file:
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* m_type: SYS_IRQCTL
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*
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* The parameters for this system call are:
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* m5_c1: IRQ_REQUEST (control operation to perform)
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* m5_c2: IRQ_VECTOR (irq line that must be controlled)
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* m5_i1: IRQ_POLICY (flags to control the IRQCTL request)
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* m5_i2: IRQ_PROC_NR (process number to notify)
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* m5_l1: IRQ_PORT (port to write to / read from)
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* m5_l2: IRQ_VIR_ADDR (virtual address at caller)
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* m5_l3: IRQ_MASK_VAL (value to be written or strobe mask)
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*
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* Author:
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* Jorrit N. Herder <jnherder@cs.vu.nl>
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*/
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#include "../kernel.h"
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#include "../system.h"
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/*===========================================================================*
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* do_irqctl *
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*===========================================================================*/
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PUBLIC int do_irqctl(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Dismember the request message. */
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int irq = m_ptr->IRQ_VECTOR; /* which IRQ vector */
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int policy = m_ptr->IRQ_POLICY; /* policy field with flags */
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long port = m_ptr->IRQ_PORT; /* port to read or write */
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vir_bytes vir_addr = m_ptr->IRQ_VIR_ADDR; /* address at caller */
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phys_bytes phys_addr = 0; /* calculate physical address */
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long mask_val = m_ptr->IRQ_MASK_VAL; /* mask or value to be written */
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int proc_nr = m_ptr->IRQ_PROC_NR; /* process number to forward to */
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/* Check if IRQ line is acceptable. */
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if ((unsigned) irq >= NR_IRQ_VECTORS) {
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kprintf("ST: irq line %d is not acceptable!\n", irq);
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return(EINVAL);
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}
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/* See what is requested and take needed actions. */
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switch(m_ptr->IRQ_REQUEST) {
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/* Enable or disable IRQs. This is straightforward. */
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case IRQ_ENABLE: {
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enable_irq(&irqtab[irq].hook);
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break;
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}
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case IRQ_DISABLE: {
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disable_irq(&irqtab[irq].hook);
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break;
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}
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/* Control IRQ policies. Set a policy and needed details in the IRQ table.
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* This policy is used by a generic function to handle hardware interrupts.
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* The generic_handler() is contained in system.c.
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*/
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case IRQ_SETPOLICY: {
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if (proc_nr == NONE) { /* remove irqtab entry */
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if (irqtab[irq].proc_nr != m_ptr->m_source) {
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return(EPERM); /* only owner may do so */
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}
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kprintf("ST: notify: cannot remove entry for IRQ %d\n",irq);
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return(ENOSYS); /* not yet supported */
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}
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else { /* install generic handler */
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if (irqtab[irq].proc_nr != NONE) { /* IRQ entry already taken */
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kprintf("ST: notify: slot for IRQ %d already taken\n", irq);
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return(EBUSY); /* cannot overwrite entry */
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}
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if (proc_nr == SELF) /* check for magic proc nr */
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proc_nr = m_ptr->m_source; /* set caller's proc nr */
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if (! isokprocn(proc_nr)) { /* check if proc nr is ok */
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kprintf("ST: notify: invalid proc_nr: %d\n", proc_nr);
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return(EINVAL);
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}
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if (policy & IRQ_READ_PORT) { /* get phys_addr at caller */
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switch(policy & (IRQ_BYTE|IRQ_WORD|IRQ_LONG)) {
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case IRQ_BYTE: phys_addr=numap_local(proc_nr,vir_addr,sizeof( u8_t));
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break;
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case IRQ_WORD: phys_addr=numap_local(proc_nr,vir_addr,sizeof(u16_t));
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break;
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case IRQ_LONG: phys_addr=numap_local(proc_nr,vir_addr,sizeof(u32_t));
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break;
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default: return(EINVAL); /* wrong type flags */
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}
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if (phys_addr==0) return(EFAULT); /* invalid address */
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}
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/* Arguments seem to be OK, register them in the IRQ table. */
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irqtab[irq].policy = policy; /* policy for interrupts */
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irqtab[irq].proc_nr = proc_nr; /* process number to notify */
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irqtab[irq].port = port; /* port to read or write */
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irqtab[irq].addr = phys_addr; /* address to store status */
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irqtab[irq].mask_val = mask_val; /* strobe mask or value */
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put_irq_handler(&irqtab[irq].hook, irq, generic_handler);
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}
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break;
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}
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default:
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return(EINVAL); /* invalid IRQ_REQUEST */
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}
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return(OK);
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}
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