In os/main.c there is the following sequence of code. With interrupts enabled
via spl0 timer interrupts etc. will be able to flow. However, pg_init() is not
called until post_startup(). So if an interrupt occurs that requires a change
of thread then pg_ev_thread_swtch() will be called without cpu_pg->pgs having
been initialized and could cause a segv. Obviously this is not happening as
this would be a problem someone would've hit almost immediately. My question
is, is this because the window for an interrupt to occur is so small the
likelihood that the problem wouldn't be seen?
/*
* Drop the interrupt level and allow interrupts. At this point
* the DDI guarantees that interrupts are enabled.
*/
(void) spl0();
interrupts_unleashed = 1;
vfs_mountroot(); /* Mount the root file system */
errorq_init(); /* after vfs_mountroot() so DDI root is ready */
cpu_kstat_init(CPU); /* after vfs_mountroot() so TOD is valid */
ddi_walk_devs(ddi_root_node(), pm_adjust_timestamps, NULL);
/* after vfs_mountroot() so hrestime is valid */
post_startup();
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