Subversion Repositories HelenOS

Rev

Rev 2131 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 2131 Rev 2456
Line 49... Line 49...
49 
#include <console/console.h>
 49 
#include <console/console.h>
50 
#include <interrupt.h>
 50 
#include <interrupt.h>
51 
#include <arch/interrupt.h>
 51 
#include <arch/interrupt.h>
52 
#include <sysinfo/sysinfo.h>
 52 
#include <sysinfo/sysinfo.h>
53 
#include <synch/spinlock.h>
 53 
#include <synch/spinlock.h>
- 
 
 54 
#include <synch/rcu.h>
54 
 
 55 
 
55 
#define LSR_DATA_READY  0x01
 56 
#define LSR_DATA_READY  0x01
56 
 
 57 
 
57 
/** Structure representing the ns16550. */
 58 
/** Structure representing the ns16550. */
58 
static ns16550_t ns16550;
 59 
static ns16550_t ns16550;
Line 84... Line 85...
84 
    ns16550_ier_write(&ns16550, IER_ERBFI);     /* enable receiver interrupt */
 85 
    ns16550_ier_write(&ns16550, IER_ERBFI);     /* enable receiver interrupt */
85 
   
 86 
   
86 
    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY)
 87 
    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY)
87 
        (void) ns16550_rbr_read(&ns16550);
 88 
        (void) ns16550_rbr_read(&ns16550);
88 
 
 89 
 
89 
    spinlock_lock(&ns16550_irq.lock);
 90 
    //rcu_read_lock() is not needed, ints are disabled
90 
    ns16550_irq.notif_cfg.notify = false;
 91 
    //rcu: atomic update doesn't need reallocation 
91 
    spinlock_unlock(&ns16550_irq.lock);
 92 
    rcu_dereference_pointer(ns16550_irq.notif_cfg).notify = false;
92 
    interrupts_restore(ipl);
 93 
    interrupts_restore(ipl);
93 
}
 94 
}
94 
 
 95 
 
95 
/** Resume the former interrupt vector */
 96 
/** Resume the former interrupt vector */
96 
void ns16550_release(void)
 97 
void ns16550_release(void)
97 
{
 98 
{
98 
    ipl_t ipl = interrupts_disable();
 99 
    ipl_t ipl = interrupts_disable();
- 
 
 100 
    //rcu: atomic update doesn't need reallocation
99 
    spinlock_lock(&ns16550_irq.lock);
 101 
    spinlock_lock(&ns16550_irq.lock);
100 
    if (ns16550_irq.notif_cfg.answerbox)
 102 
    if (rcu_dereference_pointer(ns16550_irq.notif_cfg).answerbox)
101 
        ns16550_irq.notif_cfg.notify = true;
 103 
        rcu_dereference_pointer(ns16550_irq.notif_cfg).notify = true;
102 
    spinlock_unlock(&ns16550_irq.lock);
 104 
    spinlock_unlock(&ns16550_irq.lock);
103 
    interrupts_restore(ipl);
 105 
    interrupts_restore(ipl);
104 
}
 106 
}
105 
 
 107 
 
106 
/** Initialize ns16550.
 108 
/** Initialize ns16550.
Line 181... Line 183...
181 
 
 183 
 
182 
    ipl = interrupts_disable();
 184 
    ipl = interrupts_disable();
183 
    spinlock_lock(&ns16550_irq.lock);
 185 
    spinlock_lock(&ns16550_irq.lock);
184 
 
 186 
 
185 
    if (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) {
 187 
    if (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) {
186 
        if (ns16550_irq.notif_cfg.notify && ns16550_irq.notif_cfg.answerbox) {
 188 
        if (rcu_dereference_pointer(ns16550_irq.notif_cfg).notify && rcu_dereference_pointer(ns16550_irq.notif_cfg).answerbox) {
187 
            /*
 189 
            /*
188 
             * Send IPC notification.
 190 
             * Send IPC notification.
189 
             */
 191 
             */
190 
            ipc_irq_send_notif(&ns16550_irq);
 192 
            ipc_irq_send_notif(&ns16550_irq);
191 
            spinlock_unlock(&ns16550_irq.lock);
 193 
            spinlock_unlock(&ns16550_irq.lock);