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parisc: enable wide mode early

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The idle task might have been allocated above 4GB. With the current code
we cannot access that memory because the CPU is still running in narrow
mode.
This was found on a J5000 machine and the patch is required to enable
SPARSEMEM on that machine.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Sven Schnelle 2019-04-18 11:33:13 +02:00 committed by Helge Deller
parent 75da60ff53
commit 6b1370ae39
1 changed files with 13 additions and 0 deletions
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13
arch/parisc/kernel/head.S
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@ -329,6 +329,19 @@ smp_slave_stext:
mtsp %r0,%sr6
mtsp %r0,%sr7
#ifdef CONFIG_64BIT
/*
* Enable Wide mode early, in case the task_struct for the idle
* task in smp_init_current_idle_task was allocated above 4GB.
*/
1: mfia %rp /* clear upper part of pcoq */
ldo 2f-1b(%rp),%rp
depdi 0,31,32,%rp
bv (%rp)
ssm PSW_SM_W,%r0
2:
#endif
/* Initialize the SP - monarch sets up smp_init_current_idle_task */
load32 PA(smp_init_current_idle_task),%sp
LDREG 0(%sp),%sp /* load task address */