From: Bjorn Helgaas <bjorn_helgaas@hp.com>
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] [PATCH] set ar.k0 on APs
Date: Mon, 01 Apr 2002 23:54:20 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590701905355@msgid-missing> (raw)
We currently set ar.k0 on the BP, but not on the APs. The following
patch does it for APs as well.
Apparently Intel firmware sets ar.k0, but HP firmware doesn't.
If the kernel doesn't set ar.k0, X won't start up on APs because
it uses ar.k0 to access I/O port space.
--
Bjorn Helgaas - bjorn_helgaas@hp.com
Linux Systems Operation R&D
Hewlett-Packard
diff -u -r linux-2.4.18-ia64-020226-orig/arch/ia64/kernel/smpboot.c linux-2.4.18-ia64-020226/arch/ia64/kernel/smpboot.c
--- linux-2.4.18-ia64-020226-orig/arch/ia64/kernel/smpboot.c Mon Apr 1 16:43:58 2002
+++ linux-2.4.18-ia64-020226/arch/ia64/kernel/smpboot.c Mon Apr 1 16:44:51 2002
@@ -68,6 +68,7 @@
extern void __init calibrate_delay(void);
extern void start_ap(void);
+extern unsigned long ia64_iobase;
int cpucount;
@@ -343,6 +344,11 @@
* Get our bogomips.
*/
ia64_init_itm();
+
+ /*
+ * Set I/O port base per CPU
+ */
+ ia64_set_kr(IA64_KR_IO_BASE, ia64_iobase & ~PAGE_OFFSET);
#ifdef CONFIG_IA64_MCA
ia64_mca_cmc_vector_setup(); /* Setup vector on AP & enable */
next reply other threads:[~2002-04-01 23:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-01 23:54 Bjorn Helgaas [this message]
2002-04-02 0:15 ` [Linux-ia64] [PATCH] set ar.k0 on APs David Mosberger
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