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[MIPS] Add noulri kernel argument to disable "rdhwr $29" usermode support. 

Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Chris Dearman 2007-10-03 10:43:56 +01:00 committed by Ralf Baechle
parent 351336929c
commit bdc94eb41e
1 changed files with 12 additions and 1 deletions
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13
arch/mips/kernel/traps.c
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@ -1306,6 +1306,17 @@ int cp0_compare_irq;
int cp0_perfcount_irq;
EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
static int __cpuinitdata noulri;
static int __init ulri_disable(char *s)
{
pr_info("Disabling ulri\n");
noulri = 1;
return 1;
}
__setup("noulri", ulri_disable);
void __cpuinit per_cpu_trap_init(void)
{
unsigned int cpu = smp_processor_id();
@ -1346,7 +1357,7 @@ void __cpuinit per_cpu_trap_init(void)
if (cpu_has_mips_r2) {
unsigned int enable = 0x0000000f;
if (cpu_has_userlocal)
if (!noulri && cpu_has_userlocal)
enable |= (1 << 29);
write_c0_hwrena(enable);