diff options
| author | Li Fei <fei.li@intel.com> | 2013-08-21 12:13:57 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-09-25 21:33:22 +0400 |
| commit | 16c21ae5ca636cfd38e581ebcf709c49d78ea56d (patch) | |
| tree | f3857c441eecc0eeca42a08df490caef073ca8fc /arch/x86/kernel/reboot.c | |
| parent | 22356f447ceb8d97a4885792e7d9e4607f712e1b (diff) | |
| download | linux-16c21ae5ca636cfd38e581ebcf709c49d78ea56d.tar.xz | |
reboot: Allow specifying warm/cold reset for CF9 boot type
In current implementation for reboot type CF9 and CF9_COND,
warm and cold reset are not differentiated, and both are
performed by writing 0x06 to port 0xCF9.
This commit will differentiate warm and cold reset:
For warm reset, write 0x06 to port 0xCF9;
For cold reset, write 0x0E to port 0xCF9.
[ hpa: This meaning of "cold" and "warm" reset is different from other
reboot types use, where "warm" means "bypass BIOS POST". It is also
not entirely clear that it actually solves any actual problem. However,
it would seem fairly harmless to offer this additional option.
Also note that we do not mask bit 3 in the "warm reset" case. This
preserves the behavior on existing systems, including ones quirked
to use CF9. It seems reasonable that on any system where the
warm/cold distinction actually matters that bit 3 would be read as
zero. ]
From: Liu Chuansheng <chuansheng.liu@intel.com>
Signed-off-by: Li Fei <fei.li@intel.com>
Link: http://lkml.kernel.org/r/1377072837.24556.2.camel@fli24-HP-Compaq-8100-Elite-CMT-PC
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/reboot.c')
| -rw-r--r-- | arch/x86/kernel/reboot.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 563ed91e6faa..ca42f6350b23 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -511,10 +511,13 @@ static void native_machine_emergency_restart(void) case BOOT_CF9_COND: if (port_cf9_safe) { - u8 cf9 = inb(0xcf9) & ~6; + u8 reboot_code = reboot_mode == REBOOT_WARM ? + 0x06 : 0x0E; + u8 cf9 = inb(0xcf9) & ~reboot_code; outb(cf9|2, 0xcf9); /* Request hard reset */ udelay(50); - outb(cf9|6, 0xcf9); /* Actually do the reset */ + /* Actually do the reset */ + outb(cf9|reboot_code, 0xcf9); udelay(50); } reboot_type = BOOT_KBD; |