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[POWERPC] kexec: Send slaves to new kernel earlier

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With this, when kexec-ing, we copy the code and start the slaves on
their journey to the next kernel's spin loop as soon as we copy the
kexec image into place.

The kernel doesn't know exactly which slaves are spinning in
kexec_wait.  This allows us to pass more than max-cpus to the
next kernel.  But it also means that we might leave some behind.

Moving the code here means they have the time it takes us to
clear the hash table to wake up and move on.  Moving the code
any earlier would reuqire walking the image description to
search for the code, which could span multiple pages.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Milton Miller 2007-04-11 18:32:17 +10:00 committed by Paul Mackerras
parent e58ca3de64
commit ee46a90b59
1 changed files with 13 additions and 13 deletions
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26
arch/powerpc/kernel/misc_64.S
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@ -646,6 +646,19 @@ _GLOBAL(kexec_sequence)
/* turn off mmu */
bl real_mode
/* copy 0x100 bytes starting at start to 0 */
li r3,0
mr r4,r30 /* start, aka phys mem offset */
li r5,0x100
li r6,0
bl .copy_and_flush /* (dest, src, copy limit, start offset) */
1: /* assume normal blr return */
/* release other cpus to the new kernel secondary start at 0x60 */
mflr r5
li r6,1
stw r6,kexec_flag-1b(5)
/* clear out hardware hash page table and tlb */
ld r5,0(r27) /* deref function descriptor */
mtctr r5
@ -676,19 +689,6 @@ _GLOBAL(kexec_sequence)
* are the boot cpu ?????
* other device tree differences (prop sizes, va vs pa, etc)...
*/
/* copy 0x100 bytes starting at start to 0 */
li r3,0
mr r4,r30
li r5,0x100
li r6,0
bl .copy_and_flush /* (dest, src, copy limit, start offset) */
1: /* assume normal blr return */
/* release other cpus to the new kernel secondary start at 0x60 */
mflr r5
li r6,1
stw r6,kexec_flag-1b(5)
mr r3,r25 # my phys cpu
mr r4,r30 # start, aka phys mem offset
mtlr 4