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Fix the interrupt handling...

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we now differntiate between an I/O interrupt (ie one that is likely
to be triggered by a device on the system using an IRQ between
0 and 15) and one that we're creating to allow us to have functions
called for events, ie a software interrupt. Behaviour is all
commented in the file int.c, but you need to make sure that you call the
correct version.

install_io_interrupt_handler now needs an IRQ value between 0 and 15 and
will treat the irq as one it needs to enable/disable

install_interrupt_handler is for software interrupts and is essentially
the function we had.

For mroe read the comments in the file.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@348 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
David Reid 2002-07-19 18:33:41 +00:00
parent c6aa053941
commit b1dba4cbd5
4 changed files with 105 additions and 61 deletions
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13
src/kernel/core/arch/x86/arch_int.c
View File

@ -78,9 +78,10 @@ static void _set_gate(desc_table *gate_addr, unsigned int addr, int type, int dp
void arch_int_enable_io_interrupt(int irq)
{
if(irq < 0x20 || irq >= 0x30) return;
irq -= 0x20;
// if this is a external interrupt via 8239, enable it here
if (irq < 0 || irq >= 0x10)
return;
dprintf("arch_int_enable_io_interrupt: irq %d\n", irq);
/* if this is a external interrupt via 8239, enable it here */
if (irq < 8)
out8(in8(0x21) & ~(1 << irq), 0x21);
else
@ -89,9 +90,9 @@ void arch_int_enable_io_interrupt(int irq)
void arch_int_disable_io_interrupt(int irq)
{
if(irq < 0x20 || irq >= 0x30) return;
irq -= 0x20;
// if this is a external interrupt via 8239, disable it here
if (irq < 0 || irq >= 0x10)
return;
/* if this is a external interrupt via 8239, disable it here */
if (irq < 8)
out8(in8(0x21) | (1 << irq), 0x21);
else

8
src/kernel/core/arch/x86/arch_smp.c
View File

@ -92,10 +92,10 @@ int arch_smp_init(kernel_args *ka)
vm_create_anonymous_region(vm_get_kernel_aspace_id(), "ioapic", (void *)&ioapic,
REGION_ADDR_EXACT_ADDRESS, PAGE_SIZE, REGION_WIRING_WIRED_ALREADY, LOCK_RW|LOCK_KERNEL);
install_io_interrupt_handler(0xfb, &i386_timer_interrupt, NULL, 0);
install_io_interrupt_handler(0xfd, &i386_ici_interrupt, NULL, 0);
install_io_interrupt_handler(0xfe, &i386_smp_error_interrupt, NULL, 0);
install_io_interrupt_handler(0xff, &i386_spurious_interrupt, NULL, 0);
install_interrupt_handler(0xfb, &i386_timer_interrupt, NULL);
install_interrupt_handler(0xfd, &i386_ici_interrupt, NULL);
install_interrupt_handler(0xfe, &i386_smp_error_interrupt, NULL);
install_interrupt_handler(0xff, &i386_spurious_interrupt, NULL);
} else {
num_cpus = 1;
}

2
src/kernel/core/arch/x86/arch_timer.c
View File

@ -72,7 +72,7 @@ int arch_init_timer(kernel_args *ka)
{
dprintf("arch_init_timer: entry\n");
install_io_interrupt_handler(0x20, &isa_timer_interrupt, NULL, 0);
install_io_interrupt_handler(0, &isa_timer_interrupt, NULL, 0);
// apic timer interrupt set up by smp code
return 0;

143
src/kernel/core/int.c
View File

@ -51,17 +51,20 @@ int_init2(kernel_args *ka)
return arch_int_init2(ka);
}
/* install_io_interrupt_handler
* install a handler to be called when an interrupt is triggered
* for the given irq with data as the argument
*/
long install_io_interrupt_handler(long irq, interrupt_handler handler,
void* data, ulong flags)
{
/* install_interrupt_handler
* This function is used internally to install a handler on the given vector.
* NB this does NOT take an IRQ, but a system interrupt value.
* As this is intended for system use this function doe NOT call
* arch_int_enable_io_interrupt() as it only works for IRQ values
*/
long install_interrupt_handler(long vector, interrupt_handler handler,
void* data)
{
struct io_handler *io = NULL;
int state;
int state;
dprintf("install_interrupt_handler: vector %ld\n", vector);
/* find the chain of handlers for this irq.
* NB there can be multiple handlers for the same IRQ, especially for
* PCI drivers. Where we have multiple handlers we will call each in turn
@ -74,19 +77,37 @@ long install_io_interrupt_handler(long irq, interrupt_handler handler,
io->data = data;
/* Make sure our list is init'd or bad things will happen */
if (io_vectors[irq].handler_list.next == NULL) {
io_vectors[irq].handler_list.next = &io_vectors[irq].handler_list;
io_vectors[irq].handler_list.prev = &io_vectors[irq].handler_list;
if (io_vectors[vector].handler_list.next == NULL) {
io_vectors[vector].handler_list.next = &io_vectors[vector].handler_list;
io_vectors[vector].handler_list.prev = &io_vectors[vector].handler_list;
}
/* Disable the interrupts, get the spinlock for this irq only
* and then insert the handler */
state = int_disable_interrupts();
acquire_spinlock(&io_vectors[irq].vector_lock);
insque(io, &io_vectors[irq].handler_list);
release_spinlock(&io_vectors[irq].vector_lock);
acquire_spinlock(&io_vectors[vector].vector_lock);
insque(io, &io_vectors[vector].handler_list);
release_spinlock(&io_vectors[vector].vector_lock);
int_restore_interrupts(state);
return 0;
}
/* install_io_interrupt_handler
* install a handler to be called when an interrupt is triggered
* for the given irq with data as the argument
*/
long install_io_interrupt_handler(long irq, interrupt_handler handler,
void* data, ulong flags)
{
long vector = irq + 0x20;
long rv;
dprintf("install_io_interrupt_handler: irq %ld\n", irq);
rv = install_interrupt_handler(vector, handler, data);
if (rv != 0)
return rv;
/* If we were passed the bit-flag B_NO_ENABLE_COUNTER then
* we're being asked to not alter whether the interrupt is set
* regardless of setting.
@ -97,50 +118,60 @@ long install_io_interrupt_handler(long irq, interrupt_handler handler,
return 0;
}
/* remove_interrupt_handler
* read notes for install_interrupt_handler
*/
long remove_interrupt_handler(long vector, interrupt_handler handler,
void* data)
{
struct io_handler *io = NULL;
/* lock the structures down so it is not modified while we search */
int state = int_disable_interrupts();
acquire_spinlock(&io_vectors[vector].vector_lock);
/* loop through the available handlers and try to find a match.
* We go forward through the list but this means we start with the
* most recently added handlers.
*/
io = io_vectors[vector].handler_list.next;
for (io = io_vectors[vector].handler_list.next;
io != &io_vectors[vector].handler_list;
io = io->next) {
/* we have to match both function and data */
if (io->func == handler && io->data == data)
break;
}
if (io) {
remque(io);
kfree(io);
}
// release our lock as we're done with the vector
release_spinlock(&io_vectors[vector].vector_lock);
int_restore_interrupts(state);
return (io != NULL) ? 0 : EINVAL;
}
/* remove_io_interrupt_handler
* remove an interrupt handler previously inserted
*/
long remove_io_interrupt_handler(long irq, interrupt_handler handler,
void* data)
{
struct io_handler *io = NULL;
int state;
// lock the structures down so it is not modified while we search
state = int_disable_interrupts();
acquire_spinlock(&io_vectors[irq].vector_lock);
/* loop through the available handlers and try to find a match.
* We go forward through the list but this means we start with the
* most recently added handlers.
*/
io = io_vectors[irq].handler_list.next;
while (io != &io_vectors[irq].handler_list) {
/* we have to match both function and data */
if (io->func == handler && io->data == data)
break;
io = io->next;
}
if (io)
remque(io);
long vector = irq + 0x20;
long rv = remove_interrupt_handler(vector, handler, data);
// release our lock as we're done with the vector
release_spinlock(&io_vectors[irq].vector_lock);
int_restore_interrupts(state);
if (rv < 0)
return rv;
// and disable the IRQ if nothing left
if (io != NULL) {
/* we still have handlers left if the next handler doesn't point back
* to the head of the list.
*/
if (io_vectors[irq].handler_list.next != &io_vectors[irq].handler_list)
arch_int_disable_io_interrupt(irq);
kfree(io);
}
/* Check if we need to disable interrupts... */
if (io_vectors[vector].handler_list.next != &io_vectors[vector].handler_list)
arch_int_disable_io_interrupt(irq);
return (io != NULL) ? 0 : EINVAL;
return 0;
}
/* int_io_interrupt_handler
@ -165,6 +196,18 @@ int int_io_interrupt_handler(int vector)
* attention is required
* - B_INVOKE_SCHEDULER, the interrupt has been handled, but the function wants
* the scheduler to be invoked
*
* XXX - this is a change of behaviour from newos where every handler registered
* be called, even if the interrupt had been "handled" by a previous
* function.
* The logic now is that if there are no handlers then we return
* B_UNHANDLED_INTERRUPT and let the system do as it will.
* When we have the first function that claims to have "handled" the
* interrupt, by returning B_HANDLED_... or B_INVOKE_SCHEDULER we simply
* stop calling further handlers and return the value from that
* handler.
* This may not be correct but appears to be what BeOS did and seems
* right.
*/
for (io = io_vectors[vector].handler_list.next;
io != &io_vectors[vector].handler_list;