PATCH: 2.5.29 Fix pnpbios

[Alan Cox]

This should do the trick for pnpbios - we load the initial gdt into each
gdt, and we load the parameters into the gdt of the cpu making the call 
relying on the spinlock to avoid bouncing cpu due to pre-empt

diff -u --exclude-from /usr/src/exclude --new-file --recursive linux-2.5.29/drivers/pnp/pnpbios_core.c linux-2.5.29-ac1/drivers/pnp/pnpbios_core.c
--- linux-2.5.29/drivers/pnp/pnpbios_core.c	2002-07-20 20:11:06.000000000 +0100
+++ linux-2.5.29-ac1/drivers/pnp/pnpbios_core.c	2002-07-28 00:35:17.000000000 +0100
@@ -124,13 +124,13 @@
 	".previous		\n"
 );
 
-#define Q_SET_SEL(selname, address, size) \
-set_base (gdt [(selname) >> 3], __va((u32)(address))); \
-set_limit (gdt [(selname) >> 3], size)
-
-#define Q2_SET_SEL(selname, address, size) \
-set_base (gdt [(selname) >> 3], (u32)(address)); \
-set_limit (gdt [(selname) >> 3], size)
+#define Q_SET_SEL(cpu, selname, address, size) \
+set_base(cpu_gdt_table[cpu][(selname) >> 3], __va((u32)(address))); \
+_set_limit(&cpu_gdt_table[cpu][(selname) >> 3], size)
+
+#define Q2_SET_SEL(cpu, selname, address, size) \
+set_base(cpu_gdt_table[cpu][(selname) >> 3], (u32)(address)); \
+_set_limit((char *)&cpu_gdt_table[cpu][(selname) >> 3], size)
 
 /*
  * At some point we want to use this stack frame pointer to unwind
@@ -161,10 +161,11 @@
 	/* On some boxes IRQ's during PnP BIOS calls are deadly.  */
 	spin_lock_irqsave(&pnp_bios_lock, flags);
 
+	/* The lock prevents us bouncing CPU here */
 	if (ts1_size)
-		Q2_SET_SEL(PNP_TS1, ts1_base, ts1_size);
+		Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
 	if (ts2_size)
-		Q2_SET_SEL(PNP_TS2, ts2_base, ts2_size);
+		Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
 
 	__asm__ __volatile__(
 	        "pushl %%ebp\n\t"
@@ -1265,12 +1266,16 @@
                        check->fields.version >> 4, check->fields.version & 15,
 		       check->fields.pm16cseg, check->fields.pm16offset,
 		       check->fields.pm16dseg);
-		Q2_SET_SEL(PNP_CS32, &pnp_bios_callfunc, 64 * 1024);
-		Q_SET_SEL(PNP_CS16, check->fields.pm16cseg, 64 * 1024);
-		Q_SET_SEL(PNP_DS, check->fields.pm16dseg, 64 * 1024);
 		pnp_bios_callpoint.offset = check->fields.pm16offset;
 		pnp_bios_callpoint.segment = PNP_CS16;
 		pnp_bios_hdr = check;
+
+		for(i=0; i < NR_CPUS; i++)
+		{
+			Q2_SET_SEL(i, PNP_CS32, &pnp_bios_callfunc, 64 * 1024);
+			Q_SET_SEL(i, PNP_CS16, check->fields.pm16cseg, 64 * 1024);
+			Q_SET_SEL(i, PNP_DS, check->fields.pm16dseg, 64 * 1024);
+		}
 		break;
 	}
 	if (!pnp_bios_present())