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Annotation of OSKit-Mach/oskit/osenv_synch.c, revision 1.1.1.1

1.1       root        1: #include <oskit/dev/dev.h>
                      2: 
                      3: #include <machine/spl.h>
                      4: #include "ds_oskit.h"
                      5: 
                      6: extern spl_t curr_ipl;
                      7: 
                      8: /*
                      9:  * Enable/disable interrupts.
                     10:  */
                     11: 
                     12: static spl_t osenv_intr_spl;
                     13: 
                     14: void
                     15: osenv_intr_disable(void)
                     16: {
                     17:   /* We can be called with interrupts already disabled! */
                     18:   if (curr_ipl > SPLIO)
                     19:     /* We are already at higher priority than oskit code normally runs.
                     20:        I think this only happens in the calls from oskit_rtc_{get,set}.
                     21:        On the assumption that osenv_intr_enable will be called in
                     22:        parity from the same interrupt level, we will want to stay at the
                     23:        same high interrupt level.  */
                     24:     osenv_intr_spl = curr_ipl;
                     25:   else if (curr_ipl < SPLIO)
                     26:     /* We are at a level where oskit interrupts are enabled, so we must go
                     27:        to splio.  osenv_intr_enable we will return to the current level.  */
                     28:     osenv_intr_spl = splio ();
                     29: }
                     30: 
                     31: void
                     32: osenv_intr_enable(void)
                     33: {
                     34:   /* We assume we are at splio or higher.  */
                     35:   spl_t s = osenv_intr_spl;
                     36:   osenv_intr_spl = SPL0;
                     37:   splx (s);
                     38: }
                     39: 
                     40: /*
                     41:  * Return the current interrupt enable flag.
                     42:  */
                     43: int
                     44: osenv_intr_enabled(void)
                     45: {
                     46:   return curr_ipl < SPLIO;
                     47: }
                     48: 
                     49: /*
                     50:  * Disable interrupts returning the old value.  Combo of:
                     51:  *     save = osenv_intr_enabled();
                     52:  *     osenv_intr_disable();
                     53:  */
                     54: int
                     55: osenv_intr_save_disable(void)
                     56: {
                     57:   if (osenv_intr_enabled ())
                     58:     {
                     59:       osenv_intr_disable ();
                     60:       return 1;
                     61:     }
                     62:   return 0;
                     63: }

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