diff options
| author | Chris Dearman <chris@mips.com> | 2007-10-03 10:43:56 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2008-04-28 17:14:26 +0100 |
| commit | bdc94eb41e6090961695747508ac7e33ea5d6c08 (patch) | |
| tree | 37351b46cc1bfaa6c6faedabb2b8f3a7c5671152 /arch/mips/kernel | |
| parent | 351336929ccf222ae38ff0cb7a8dd5fd5c6236a0 (diff) | |
[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>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/traps.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 984c0d0a7b4..d51f4e98455 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); |