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    Contents of /trunk/kernel26-xen/patches-2.6.25-r1/1054-2.6.25-xen-DEBUG-Add-xprintk-to-log-directly-via-hypercall-fo.patch

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    Revision 606 - (show annotations) (download)
    Thu May 22 23:13:13 2008 UTC (15 years, 11 months ago) by niro
    File size: 1574 byte(s) 
    -ver bump to 2.6.25-magellan-r1:
- linux-2.6.25.4
- fbcondecor-0.9.4
- squashfs-3.3
- unionfs-2.3.3
- tuxonice-3.0-rc7
- linux-phc-0.3.0
- acpi-dstd-0.9a
- reiser4
- xen-3.2.0
. ipw3945-1.2.2
    1 From aa819a503e9dab87d2451996ab75133b2022f871 Mon Sep 17 00:00:00 2001
    2 From: Stephen Tweedie <sct@redhat.com>
    3 Date: Wed, 21 Nov 2007 18:40:31 +0000
    4 Subject: [PATCH] DEBUG: Add xprintk to log directly via hypercall, for early debugging
    5
    6 Signed-off-by: Stephen Tweedie <sct@redhat.com>
    7 ---
    8 arch/x86/xen/enlighten.c | 31 +++++++++++++++++++++++++++++++
    9 1 files changed, 31 insertions(+), 0 deletions(-)
    10
    11 diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
    12 index bb97446..b091b1c 100644
    13 --- a/arch/x86/xen/enlighten.c
    14 +++ b/arch/x86/xen/enlighten.c
    15 @@ -137,6 +137,37 @@ static void __init xen_vcpu_setup(int cpu)
    16 }
    17 }
    18
    19 +static void kcons_write_dom0(const char *s, unsigned int count)
    20 +{
    21 + int rc;
    22 +
    23 + while ((count > 0) &&
    24 + ((rc = HYPERVISOR_console_io(
    25 + CONSOLEIO_write, count, (char *)s)) > 0)) {
    26 + count -= rc;
    27 + s += rc;
    28 + }
    29 +}
    30 +
    31 +
    32 +/*** Useful function for console debugging -- goes straight to Xen. ***/
    33 +asmlinkage int xprintk(const char *fmt, ...)
    34 +{
    35 + va_list args;
    36 + int printk_len;
    37 + static char printk_buf[1024];
    38 +
    39 + /* Emit the output into the temporary buffer */
    40 + va_start(args, fmt);
    41 + printk_len = vsnprintf(printk_buf, sizeof(printk_buf), fmt, args);
    42 + va_end(args);
    43 +
    44 + /* Send the processed output directly to Xen. */
    45 + kcons_write_dom0(printk_buf, printk_len);
    46 +
    47 + return 0;
    48 +}
    49 +
    50 static void __init xen_banner(void)
    51 {
    52 printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
    53 --
    54 1.5.4.1
    55