198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
96 lines
3 KiB
C
96 lines
3 KiB
C
/* 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 (irq policy allows reenabling interrupts)
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* m5_l3: IRQ_HOOK_ID (index of irq hook assigned at kernel)
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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 "../system.h"
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#if USE_IRQCTL
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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_vec;
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int irq_hook_id;
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int r = OK;
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irq_hook_t *hook_ptr;
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/* Hook identifiers start at 1 and end at NR_IRQ_HOOKS. */
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irq_hook_id = (unsigned) m_ptr->IRQ_HOOK_ID - 1;
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irq_vec = (unsigned) m_ptr->IRQ_VECTOR;
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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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case IRQ_DISABLE:
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if (irq_hook_id >= NR_IRQ_HOOKS ||
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irq_hooks[irq_hook_id].proc_nr == NONE) return(EINVAL);
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if (irq_hooks[irq_hook_id].proc_nr != m_ptr->m_source) return(EPERM);
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if (m_ptr->IRQ_REQUEST == IRQ_ENABLE)
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enable_irq(&irq_hooks[irq_hook_id]);
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else
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disable_irq(&irq_hooks[irq_hook_id]);
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break;
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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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*/
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case IRQ_SETPOLICY:
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/* Check if IRQ line is acceptable. */
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if (irq_vec < 0 || irq_vec >= NR_IRQ_VECTORS) return(EINVAL);
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/* Find a free IRQ hook for this mapping. */
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hook_ptr = NULL;
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for (irq_hook_id=0; irq_hook_id<NR_IRQ_HOOKS; irq_hook_id++) {
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if (irq_hooks[irq_hook_id].proc_nr == NONE) {
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hook_ptr = &irq_hooks[irq_hook_id]; /* free hook */
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break;
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}
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}
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if (hook_ptr == NULL) return(ENOSPC);
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/* Only caller can request IRQ mappings. Install handler. */
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hook_ptr->proc_nr = m_ptr->m_source; /* process to notify */
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hook_ptr->policy = m_ptr->IRQ_POLICY; /* policy for interrupts */
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put_irq_handler(hook_ptr, irq_vec, generic_handler);
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/* Return index of the IRQ hook in use. */
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m_ptr->IRQ_HOOK_ID = irq_hook_id + 1;
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break;
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case IRQ_RMPOLICY:
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if (irq_hook_id >= NR_IRQ_HOOKS ||
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irq_hooks[irq_hook_id].proc_nr == NONE) {
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return(EINVAL);
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} else if (m_ptr->m_source != irq_hooks[irq_hook_id].proc_nr) {
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return(EPERM);
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} else {
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r = rm_irq_handler(irq_vec, irq_hooks[irq_hook_id].id);
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}
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break;
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default:
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r = EINVAL; /* invalid IRQ_REQUEST */
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}
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return(r);
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}
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#endif /* USE_IRQCTL */
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