Remove lapic TPR remnants on amd64

On amd64, the TPR register is also available via cr8. We use lcr8(0) to
set it to 0 in the appropriate places. There is no need to touch it
in lapic_map().

This means the only remaining symbol from the lapic MMIO page we use is
local_apic. All other registers are expressed in offsets from that symbol via
i82489_writereg/i82489_readreg(). Remove the other symbols.

ok guenther@

Author: sf

sys/arch/amd64/amd64/lapic.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: lapic.c,v 1.74 2024/11/07 17:24:42 bluhm Exp $	*/
+/*	$OpenBSD: lapic.c,v 1.75 2025/08/02 07:33:28 sf Exp $	*/
 /* $NetBSD: lapic.c,v 1.2 2003/05/08 01:04:35 fvdl Exp $ */
 
 /*-
@@ -179,10 +179,8 @@ lapic_map(paddr_t lapic_base)
 	vaddr_t va;
 	u_int64_t msr;
 	u_long s;
-	int tpr;
 
 	s = intr_disable();
-	tpr = lapic_tpr;
 
 	msr = rdmsr(MSR_APICBASE);
 
@@ -210,7 +208,6 @@ lapic_map(paddr_t lapic_base)
 		x2apic_enabled = 1;
 		codepatch_call(CPTAG_EOI, &x2apic_eoi);
 
-		lapic_writereg(LAPIC_TPRI, tpr);
 		va = (vaddr_t)&local_apic;
 	} else {
 		/*
@@ -225,8 +222,6 @@ lapic_map(paddr_t lapic_base)
 		pte = kvtopte(va);
 		*pte = lapic_base | PG_RW | PG_V | PG_N | PG_G | pg_nx;
 		invlpg(va);
-
-		lapic_tpr = tpr;
 	}
 
 	/*

sys/arch/amd64/amd64/locore.S

@@ -1,4 +1,4 @@
-/*	$OpenBSD: locore.S,v 1.150 2025/02/02 05:45:20 guenther Exp $	*/
+/*	$OpenBSD: locore.S,v 1.151 2025/08/02 07:33:28 sf Exp $	*/
 /*	$NetBSD: locore.S,v 1.13 2004/03/25 18:33:17 drochner Exp $	*/
 
 /*
@@ -148,18 +148,9 @@
 
 #if NLAPIC > 0 
 	.align	NBPG, 0xcc
-	.globl	local_apic, lapic_id, lapic_tpr
+	.globl	local_apic
 local_apic:
-	.space	LAPIC_ID
-lapic_id:
-	.long	0x00000000
-	.space	LAPIC_TPRI-(LAPIC_ID+4)
-lapic_tpr:
-	.space	LAPIC_PPRI-LAPIC_TPRI
-lapic_ppr:
-	.space	LAPIC_ISR-LAPIC_PPRI 
-lapic_isr:
-	.space	NBPG-LAPIC_ISR
+	.space	NBPG
 #endif
 
 /*****************************************************************************/