lkml.org 
[lkml]   [2005]   [Sep]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[PATCH 2/3] Pnp bios gdt fix
From
PnP BIOS for x86 is part of drivers, so I missed it in the initial
GDT page alignment patch. Kudos to Andrew for fixing that.
Unfortunately, fixing the build introduced a kernel panic when
trying to setup the as of yet unallocated GDTs for the APs.
This fixes the problem by setting only the BSP's GDT, then copying
the PnP segments back to the cpu_gdt_table template.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Index: linux-2.6.14-rc2/drivers/pnp/pnpbios/bioscalls.c
===================================================================
--- linux-2.6.14-rc2.orig/drivers/pnp/pnpbios/bioscalls.c 2005-09-28 14:16:34.000000000 -0700
+++ linux-2.6.14-rc2/drivers/pnp/pnpbios/bioscalls.c 2005-09-28 14:23:57.000000000 -0700
@@ -528,17 +528,24 @@ static int pnp_bios_write_escd(char *dat

void pnpbios_calls_init(union pnp_bios_install_struct *header)
{
- int i;
spin_lock_init(&pnp_bios_lock);
pnp_bios_callpoint.offset = header->fields.pm16offset;
pnp_bios_callpoint.segment = PNP_CS16;

set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
_set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
- for(i=0; i < NR_CPUS; i++)
- {
- Q2_SET_SEL(i, PNP_CS32, &pnp_bios_callfunc, 64 * 1024);
- Q_SET_SEL(i, PNP_CS16, header->fields.pm16cseg, 64 * 1024);
- Q_SET_SEL(i, PNP_DS, header->fields.pm16dseg, 64 * 1024);
- }
+
+ /*
+ * This is awkward; GDT entries needed for this driver must
+ * be set during init on the BSP, but also copied into the
+ * cpu_gdt_table template for the APs to acquire. This is
+ * because APs will not have allocated GDTs until later in
+ * the boot process.
+ */
+ Q2_SET_SEL(0, PNP_CS32, &pnp_bios_callfunc, 64 * 1024);
+ Q_SET_SEL(0, PNP_CS16, header->fields.pm16cseg, 64 * 1024);
+ Q_SET_SEL(0, PNP_DS, header->fields.pm16dseg, 64 * 1024);
+ memcpy(&cpu_gdt_table[GDT_ENTRY_PNPBIOS_BASE],
+ &get_cpu_gdt_table(0)[GDT_ENTRY_PNPBIOS_BASE],
+ 3 * sizeof(struct desc_struct));
}
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2005-09-28 23:49    [W:0.022 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site