diff --git a/include/common/aarch32/el3_common_macros.S b/include/common/aarch32/el3_common_macros.S
index 0018ea4..50ce952 100644
--- a/include/common/aarch32/el3_common_macros.S
+++ b/include/common/aarch32/el3_common_macros.S
@@ -67,14 +67,6 @@
 	orr	r0, r0, #SCR_SIF_BIT
 	stcopr	r0, SCR
 
-	/* -----------------------------------------------------------------
-	 * Reset those registers that may have architecturally unknown reset
-	 * values
-	 * -----------------------------------------------------------------
-	 */
-	mov	r0, #0
-	stcopr	r0, SDCR
-
 	/* -----------------------------------------------------
 	 * Enable the Asynchronous data abort now that the
 	 * exception vectors have been setup.
diff --git a/include/lib/aarch32/arch.h b/include/lib/aarch32/arch.h
index 3c5ab26..170fa84 100644
--- a/include/lib/aarch32/arch.h
+++ b/include/lib/aarch32/arch.h
@@ -382,8 +382,8 @@
 
 /* Debug register defines. The format is: coproc, opt1, CRn, CRm, opt2 */
 #define HDCR		p15, 4, c1, c1, 1
-#define SDCR		p15, 0, c1, c3, 1
 #define PMCR		p15, 0, c9, c12, 0
+#define CNTHP_CTL	p15, 4, c14, c2, 1
 
 /* GICv3 CPU Interface system register defines. The format is: coproc, opt1, CRn, CRm, opt2 */
 #define ICC_IAR1	p15, 0, c12, c12, 0
diff --git a/include/lib/aarch32/arch_helpers.h b/include/lib/aarch32/arch_helpers.h
index 0633bca..7955d62 100644
--- a/include/lib/aarch32/arch_helpers.h
+++ b/include/lib/aarch32/arch_helpers.h
@@ -250,6 +250,7 @@
 DEFINE_COPROCR_RW_FUNCS(icc_eoir1_el1, ICC_EOIR1)
 
 DEFINE_COPROCR_RW_FUNCS(hdcr, HDCR)
+DEFINE_COPROCR_RW_FUNCS(cnthp_ctl, CNTHP_CTL)
 DEFINE_COPROCR_READ_FUNC(pmcr, PMCR)
 
 /*
diff --git a/include/lib/aarch64/arch_helpers.h b/include/lib/aarch64/arch_helpers.h
index 37db031..a013809 100644
--- a/include/lib/aarch64/arch_helpers.h
+++ b/include/lib/aarch64/arch_helpers.h
@@ -280,6 +280,8 @@
 DEFINE_SYSREG_READ_FUNC(ctr_el0)
 
 DEFINE_SYSREG_RW_FUNCS(mdcr_el2)
+DEFINE_SYSREG_RW_FUNCS(hstr_el2)
+DEFINE_SYSREG_RW_FUNCS(cnthp_ctl_el2)
 DEFINE_SYSREG_READ_FUNC(pmcr_el0)
 
 DEFINE_RENAME_SYSREG_RW_FUNCS(icc_sre_el1, ICC_SRE_EL1)