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[SPARC64]: Do not try to write to %tick or %stick on SUN4V.

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Writes by privileged code are disallowed.  The hypervisor manages
the non-privileged bit.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-02-11 23:14:59 -08:00
parent b5a37e96b8
commit 7aa6264543
1 changed files with 15 additions and 9 deletions
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24
arch/sparc64/kernel/time.c
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@ -193,16 +193,22 @@ struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
static void stick_init_tick(unsigned long offset)
{
tick_disable_protection();
/* Writes to the %tick and %stick register are not
* allowed on sun4v. The Hypervisor controls that
* bit, per-strand.
*/
if (tlb_type != hypervisor) {
tick_disable_protection();
/* Let the user get at STICK too. */
__asm__ __volatile__(
" rd %%asr24, %%g2\n"
" andn %%g2, %0, %%g2\n"
" wr %%g2, 0, %%asr24"
: /* no outputs */
: "r" (TICK_PRIV_BIT)
: "g1", "g2");
/* Let the user get at STICK too. */
__asm__ __volatile__(
" rd %%asr24, %%g2\n"
" andn %%g2, %0, %%g2\n"
" wr %%g2, 0, %%asr24"
: /* no outputs */
: "r" (TICK_PRIV_BIT)
: "g1", "g2");
}
__asm__ __volatile__(
" rd %%asr24, %%g1\n"