linux-kernel - Re: 2.6.22-rc1-mm1

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Date:	Mon, 21 May 2007 08:41:43 +0000
From:	"young dave" <hidave.darkstar@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.22-rc1-mm1

Hi,

kernel booting and stopped in edd.c:read_sector.

I add debug messages around the two inline assemblly sentence, recompile kernel,
now strange thing happend, the kernel booting directly, but the printf
messages can't be seen because it's too rapid.

can we use printk in boot code?

the change of edd.c:
--- edd.c.bak   2007-05-21 14:38:34.000000000 +0000
+++ edd.c       2007-05-21 15:58:02.000000000 +0000
@@ -47,9 +47,11 @@ static int read_sector(u8 devno, u64 lba
        ax = 0x4200;            /* Extended Read */
        si = (size_t)&dapa;
        dx = devno;
+       printf("before first inline\n");
        asm("pushfl; stc; int $0x13; setc %%al; popfl"
            : "+a" (ax), "+S" (si), "+d" (devno)
            : : "ebx", "ecx", "edi");
+       printf("after first inline\n");

        if (!(u8)ax)
                return 0;       /* OK */
@@ -58,9 +60,11 @@ static int read_sector(u8 devno, u64 lba
        cx = 0x0001;            /* Sector 0-0-1 */
        dx = devno;
        bx = (size_t)buf;
+       printf("before second inline\n");
        asm("pushfl; stc; int $0x13; setc %%al; popfl"
            : "+a" (ax), "+c" (cx), "+d" (dx), "+b" (bx)
            : : "esi", "edi");
+       printf("after second inline\n");

        return -(u8)ax;         /* 0 or -1 */
 }



Regards
dave
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