Changeset a9ac978 in mainline for kernel/arch/sparc64/src/start.S

Timestamp:

2006-09-27T20:11:34Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

00b38a3

Parents:

86b31ba9

Message:

SMP stuff for sparc64.
Almost complete except for IPIs.
The absence of IPI support deadlocks
the kernel when more CPUs are configured.

File:

• kernel/arch/sparc64/src/start.S (modified) (4 diffs)

kernel/arch/sparc64/src/start.S

@@ -27 +27 @@
 #
 
+#include <arch/arch.h>
 #include <arch/regdef.h>
 #include <arch/boot/boot.h>
@@ -33 +34 @@
 #include <arch/mm/tlb.h>
 #include <arch/mm/tte.h>
+
+#ifdef CONFIG_SMP
+#include <arch/context_offset.h>
+#endif
 
 .register %g2, #scratch
@@ -227 +232 @@
         wrpr %g0, 0, %tl
 
-        brz %l7, 2f                             ! skip if you are not the bootstrap CPU
+        brz %l7, 1f                             ! skip if you are not the bootstrap CPU
+        nop
 
         call arch_pre_main
@@ -237 +243 @@
         /* Not reached. */
 
+0:
+        ba 0b
+        nop
+
+
+        /*
+         * Read MID from the processor.
+         */
+1:
+        ldxa [%g0] ASI_UPA_CONFIG, %g1
+        srlx %g1, UPA_CONFIG_MID_SHIFT, %g1
+        and %g1, UPA_CONFIG_MID_MASK, %g1
+
+        /*
+         * Active loop for APs until the BSP picks them up.
+         * A processor cannot leave the loop until the
+         * global variable 'waking_up_mid' equals its
+         * MID.
+         */
+        set waking_up_mid, %g2
 2:
-        b 2b
-        nop
+        ldx [%g2], %g3
+        cmp %g3, %g1
+        bne 2b
+        nop
+
+#ifdef CONFIG_SMP
+        /*
+         * Configure stack for the AP.
+         * The AP is expected to use the stack saved
+         * in the ctx global variable.
+         */
+        set ctx, %g1
+        add %g1, OFFSET_SP, %g1
+        ldx [%g1], %o6
+
+        call main_ap
+        nop
+#endif
+
+        /* Not reached. */
+        
+0:
+        ba 0b
+        nop