MIPS: Define & use CP0_EBase bit definitions

Add definitions for the bits & fields in the CP0_EBase register, and use
them from a few different places in arch/mips which hardcoded these
values.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Jayachandran C <jchandra@broadcom.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13222/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mipsregs.h

@@ -676,6 +676,14 @@
 #define MIPS_MAAR_S		(_ULCAST_(1) << 1)
 #define MIPS_MAAR_V		(_ULCAST_(1) << 0)
 
+/* EBase bit definitions */
+#define MIPS_EBASE_CPUNUM_SHIFT	0
+#define MIPS_EBASE_CPUNUM	(_ULCAST_(0x3ff) << 0)
+#define MIPS_EBASE_WG_SHIFT	11
+#define MIPS_EBASE_WG		(_ULCAST_(1) << 11)
+#define MIPS_EBASE_BASE_SHIFT	12
+#define MIPS_EBASE_BASE		(~_ULCAST_((1 << MIPS_EBASE_BASE_SHIFT) - 1))
+
 /* CMGCRBase bit definitions */
 #define MIPS_CMGCRB_BASE	11
 #define MIPS_CMGCRF_BASE	(~_ULCAST_((1 << MIPS_CMGCRB_BASE) - 1))
@@ -2104,7 +2112,7 @@ __BUILD_SET_C0(brcm_mode)
  */
 static inline unsigned int get_ebase_cpunum(void)
 {
-	return read_c0_ebase() & 0x3ff;
+	return read_c0_ebase() & MIPS_EBASE_CPUNUM;
 }
 
 #endif /* !__ASSEMBLY__ */

arch/mips/kvm/trap_emul.c

@@ -505,7 +505,8 @@ static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu)
 	kvm_write_c0_guest_intctl(cop0, 0xFC000000);
 
 	/* Put in vcpu id as CPUNum into Ebase Reg to handle SMP Guests */
-	kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 | (vcpu_id & 0xFF));
+	kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 |
+				       (vcpu_id & MIPS_EBASE_CPUNUM));
 
 	return 0;
 }

arch/mips/netlogic/xlp/nlm_hal.c

@@ -58,7 +58,7 @@ void nlm_node_init(int node)
 		nodep->coremask = 1;	/* node 0, boot cpu */
 	nodep->sysbase = nlm_get_sys_regbase(node);
 	nodep->picbase = nlm_get_pic_regbase(node);
-	nodep->ebase = read_c0_ebase() & (~((1 << 12) - 1));
+	nodep->ebase = read_c0_ebase() & MIPS_EBASE_BASE;
 	if (cpu_is_xlp9xx())
 		nodep->socbus = xlp9xx_get_socbus(node);
 	else

arch/mips/netlogic/xlr/setup.c

@@ -168,7 +168,7 @@ static void nlm_init_node(void)
 
 	nodep = nlm_current_node();
 	nodep->picbase = nlm_mmio_base(NETLOGIC_IO_PIC_OFFSET);
-	nodep->ebase = read_c0_ebase() & (~((1 << 12) - 1));
+	nodep->ebase = read_c0_ebase() & MIPS_EBASE_BASE;
 	spin_lock_init(&nodep->piclock);
 }