diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-19 20:35:02 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-19 20:35:02 +0200 |
| commit | b17530bda22e7ffbf08f7a8a50743256b1672f6a (patch) | |
| tree | 061c081e68d8dc6f7326d45bca97997b337efe27 | |
| parent | 764922376ca39085e217656af6784a3377d98566 (diff) | |
x86: add force_hpet boot option
add force_hpet boot option.
(this will be useful to make the forced-enable quirks depend on.)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/hpet.c | 3 | ||||
| -rw-r--r-- | include/asm-x86/hpet.h | 1 |
3 files changed, 8 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 189df0bcab9..c6859b94aaa 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -431,8 +431,10 @@ and is between 256 and 4096 characters. It is defined in the file over the 8254 in addition to over the IO-APIC. The kernel tries to set a sensible default. - hpet= [X86-32,HPET] option to disable HPET and use PIT. - Format: disable + hpet= [X86-32,HPET] option to control HPET usage + Format: { enable (default) | disable | force } + disable: disable HPET and use PIT instead + force: allow force enabled of undocumented chips (ICH4, VIA) com20020= [HW,NET] ARCnet - COM20020 chipset Format: diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index f8367074da0..22d8f00c80d 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -69,12 +69,15 @@ static inline void hpet_clear_mapping(void) * HPET command line enable / disable */ static int boot_hpet_disable; +int hpet_force_user; static int __init hpet_setup(char* str) { if (str) { if (!strncmp("disable", str, 7)) boot_hpet_disable = 1; + if (!strncmp("force", str, 5)) + hpet_force_user = 1; } return 1; } diff --git a/include/asm-x86/hpet.h b/include/asm-x86/hpet.h index d4ab6db050b..4f51519fc19 100644 --- a/include/asm-x86/hpet.h +++ b/include/asm-x86/hpet.h @@ -64,6 +64,7 @@ /* hpet memory map physical address */ extern unsigned long hpet_address; extern unsigned long force_hpet_address; +extern int hpet_force_user; extern int is_hpet_enabled(void); extern int hpet_enable(void); extern unsigned long hpet_readl(unsigned long a); |