APIC IDs may not be consecutive and start from zero, so we cannot really use it

as a direct index into cpus.  Record apicid in struct cpu and have cpunum() look
for it. Replace cpu->id with cpunum() everywhere, and replace cpu->id with cpu->apicid.
Thanks to Xi Wang.

1 files changed, 3 insertions, 3 deletions

diff --git a/main.c b/main.c
index 2972b21..47c36cc 100644
--- a/main.c
+++ b/main.c
@@ -22,7 +22,7 @@ main(void)
   mpinit();        // detect other processors
   lapicinit();     // interrupt controller
   seginit();       // segment descriptors
-  cprintf("\ncpu%d: starting xv6\n\n", cpu->id);
+  cprintf("\ncpu%d: starting xv6\n\n", cpunum());
   picinit();       // another interrupt controller
   ioapicinit();    // another interrupt controller
   consoleinit();   // console hardware
@@ -54,7 +54,7 @@ mpenter(void)
 static void
 mpmain(void)
 {
-  cprintf("cpu%d: starting\n", cpu->id);
+  cprintf("cpu%d: starting\n", cpunum());
   idtinit();       // load idt register
   xchg(&cpu->started, 1); // tell startothers() we're up
   scheduler();     // start running processes
@@ -89,7 +89,7 @@ startothers(void)
     *(void**)(code-8) = mpenter;
     *(int**)(code-12) = (void *) V2P(entrypgdir);
 
-    lapicstartap(c->id, V2P(code));
+    lapicstartap(c->apicid, V2P(code));
 
     // wait for cpu to finish mpmain()
     while(c->started == 0)