linux-kernel - [tip:x86/reboot] reboot: Allow specifying warm/ cold reset for CF9 boot type

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Message-ID: <tip-16c21ae5ca636cfd38e581ebcf709c49d78ea56d@git.kernel.org>
Date:	Wed, 25 Sep 2013 10:36:34 -0700
From:	tip-bot for Li Fei <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, hpa@...ux.intel.com, fei.li@...el.com
Subject: [tip:x86/reboot] reboot: Allow specifying warm/
 cold reset for CF9 boot type

Commit-ID:  16c21ae5ca636cfd38e581ebcf709c49d78ea56d
Gitweb:     http://git.kernel.org/tip/16c21ae5ca636cfd38e581ebcf709c49d78ea56d
Author:     Li Fei <fei.li@...el.com>
AuthorDate: Wed, 21 Aug 2013 16:13:57 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 25 Sep 2013 19:33:22 +0200

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@...el.com>
Signed-off-by: Li Fei <fei.li@...el.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@...ux.intel.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/reboot.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 563ed91..ca42f63 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;
--
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