From bdc94eb41e6090961695747508ac7e33ea5d6c08 Mon Sep 17 00:00:00 2001 From: Chris Dearman Date: Wed, 3 Oct 2007 10:43:56 +0100 Subject: [MIPS] Add noulri kernel argument to disable "rdhwr $29" usermode support. Signed-off-by: Chris Dearman Signed-off-by: Ralf Baechle --- arch/mips/kernel/traps.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'arch/mips/kernel') diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 984c0d0a7b4d..d51f4e98455f 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -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); -- cgit v1.2.1