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Diffstat (limited to 'lib/el3_runtime/aarch64/context_mgmt.c')
-rw-r--r--lib/el3_runtime/aarch64/context_mgmt.c133
1 files changed, 110 insertions, 23 deletions
diff --git a/lib/el3_runtime/aarch64/context_mgmt.c b/lib/el3_runtime/aarch64/context_mgmt.c
index 7c6f953b2..c69dc952a 100644
--- a/lib/el3_runtime/aarch64/context_mgmt.c
+++ b/lib/el3_runtime/aarch64/context_mgmt.c
@@ -20,12 +20,16 @@
#include <lib/el3_runtime/pubsub_events.h>
#include <lib/extensions/amu.h>
#include <lib/extensions/mpam.h>
+#include <lib/extensions/sme.h>
#include <lib/extensions/spe.h>
#include <lib/extensions/sve.h>
+#include <lib/extensions/sys_reg_trace.h>
+#include <lib/extensions/trbe.h>
+#include <lib/extensions/trf.h>
#include <lib/extensions/twed.h>
#include <lib/utils.h>
-static void enable_extensions_secure(cpu_context_t *ctx);
+static void manage_extensions_secure(cpu_context_t *ctx);
/*******************************************************************************
* Context management library initialisation routine. This library is used by
@@ -90,24 +94,49 @@ void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep)
scr_el3 = read_scr();
scr_el3 &= ~(SCR_NS_BIT | SCR_RW_BIT | SCR_FIQ_BIT | SCR_IRQ_BIT |
SCR_ST_BIT | SCR_HCE_BIT);
+
+#if ENABLE_RME
+ /* When RME support is enabled, clear the NSE bit as well. */
+ scr_el3 &= ~SCR_NSE_BIT;
+#endif /* ENABLE_RME */
+
/*
* SCR_NS: Set the security state of the next EL.
*/
- if (security_state != SECURE)
+ if (security_state == NON_SECURE) {
scr_el3 |= SCR_NS_BIT;
+ }
+
+#if ENABLE_RME
+ /* Check for realm state if RME support enabled. */
+ if (security_state == REALM) {
+ scr_el3 |= SCR_NS_BIT | SCR_NSE_BIT | SCR_EnSCXT_BIT;
+ }
+#endif /* ENABLE_RME */
+
/*
* SCR_EL3.RW: Set the execution state, AArch32 or AArch64, for next
* Exception level as specified by SPSR.
*/
- if (GET_RW(ep->spsr) == MODE_RW_64)
+ if (GET_RW(ep->spsr) == MODE_RW_64) {
scr_el3 |= SCR_RW_BIT;
+ }
/*
* SCR_EL3.ST: Traps Secure EL1 accesses to the Counter-timer Physical
* Secure timer registers to EL3, from AArch64 state only, if specified
* by the entrypoint attributes.
*/
- if (EP_GET_ST(ep->h.attr) != 0U)
+ if (EP_GET_ST(ep->h.attr) != 0U) {
scr_el3 |= SCR_ST_BIT;
+ }
+
+ /*
+ * If FEAT_HCX is enabled, enable access to HCRX_EL2 by setting
+ * SCR_EL3.HXEn.
+ */
+#if ENABLE_FEAT_HCX
+ scr_el3 |= SCR_HXEn_BIT;
+#endif
#if RAS_TRAP_LOWER_EL_ERR_ACCESS
/*
@@ -141,8 +170,9 @@ void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep)
* If the Secure world wants to use pointer authentication,
* CTX_INCLUDE_PAUTH_REGS must be set to 1.
*/
- if (security_state == NON_SECURE)
+ if (security_state == NON_SECURE) {
scr_el3 |= SCR_API_BIT | SCR_APK_BIT;
+ }
#endif /* !CTX_INCLUDE_PAUTH_REGS */
#if !CTX_INCLUDE_MTE_REGS || ENABLE_ASSERTIONS
@@ -177,14 +207,20 @@ void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep)
/*
* SCR_EL3.IRQ, SCR_EL3.FIQ: Enable the physical FIQ and IRQ routing as
* indicated by the interrupt routing model for BL31.
+ *
+ * TODO: The interrupt routing model code is not updated for REALM
+ * state. Use the default values of IRQ = FIQ = 0 for REALM security
+ * state for now.
*/
- scr_el3 |= get_scr_el3_from_routing_model(security_state);
+ if (security_state != REALM) {
+ scr_el3 |= get_scr_el3_from_routing_model(security_state);
+ }
#endif
/* Save the initialized value of CPTR_EL3 register */
write_ctx_reg(get_el3state_ctx(ctx), CTX_CPTR_EL3, read_cptr_el3());
if (security_state == SECURE) {
- enable_extensions_secure(ctx);
+ manage_extensions_secure(ctx);
}
/*
@@ -245,9 +281,9 @@ void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep)
* required by PSCI specification)
*/
sctlr_elx = (EP_GET_EE(ep->h.attr) != 0U) ? SCTLR_EE_BIT : 0U;
- if (GET_RW(ep->spsr) == MODE_RW_64)
+ if (GET_RW(ep->spsr) == MODE_RW_64) {
sctlr_elx |= SCTLR_EL1_RES1;
- else {
+ } else {
/*
* If the target execution state is AArch32 then the following
* fields need to be set.
@@ -330,7 +366,7 @@ void cm_setup_context(cpu_context_t *ctx, const entry_point_info_t *ep)
* When EL2 is implemented but unused `el2_unused` is non-zero, otherwise
* it is zero.
******************************************************************************/
-static void enable_extensions_nonsecure(bool el2_unused, cpu_context_t *ctx)
+static void manage_extensions_nonsecure(bool el2_unused, cpu_context_t *ctx)
{
#if IMAGE_BL31
#if ENABLE_SPE_FOR_LOWER_ELS
@@ -341,26 +377,68 @@ static void enable_extensions_nonsecure(bool el2_unused, cpu_context_t *ctx)
amu_enable(el2_unused, ctx);
#endif
-#if ENABLE_SVE_FOR_NS
+#if ENABLE_SME_FOR_NS
+ /* Enable SME, SVE, and FPU/SIMD for non-secure world. */
+ sme_enable(ctx);
+#elif ENABLE_SVE_FOR_NS
+ /* Enable SVE and FPU/SIMD for non-secure world. */
sve_enable(ctx);
#endif
#if ENABLE_MPAM_FOR_LOWER_ELS
mpam_enable(el2_unused);
#endif
+
+#if ENABLE_TRBE_FOR_NS
+ trbe_enable();
+#endif /* ENABLE_TRBE_FOR_NS */
+
+#if ENABLE_SYS_REG_TRACE_FOR_NS
+ sys_reg_trace_enable(ctx);
+#endif /* ENABLE_SYS_REG_TRACE_FOR_NS */
+
+#if ENABLE_TRF_FOR_NS
+ trf_enable();
+#endif /* ENABLE_TRF_FOR_NS */
#endif
}
/*******************************************************************************
* Enable architecture extensions on first entry to Secure world.
******************************************************************************/
-static void enable_extensions_secure(cpu_context_t *ctx)
+static void manage_extensions_secure(cpu_context_t *ctx)
{
#if IMAGE_BL31
-#if ENABLE_SVE_FOR_SWD
+ #if ENABLE_SME_FOR_NS
+ #if ENABLE_SME_FOR_SWD
+ /*
+ * Enable SME, SVE, FPU/SIMD in secure context, secure manager must
+ * ensure SME, SVE, and FPU/SIMD context properly managed.
+ */
+ sme_enable(ctx);
+ #else /* ENABLE_SME_FOR_SWD */
+ /*
+ * Disable SME, SVE, FPU/SIMD in secure context so non-secure world can
+ * safely use the associated registers.
+ */
+ sme_disable(ctx);
+ #endif /* ENABLE_SME_FOR_SWD */
+ #elif ENABLE_SVE_FOR_NS
+ #if ENABLE_SVE_FOR_SWD
+ /*
+ * Enable SVE and FPU in secure context, secure manager must ensure that
+ * the SVE and FPU register contexts are properly managed.
+ */
sve_enable(ctx);
-#endif
-#endif
+ #else /* ENABLE_SVE_FOR_SWD */
+ /*
+ * Disable SVE and FPU in secure context so non-secure world can safely
+ * use them.
+ */
+ sve_disable(ctx);
+ #endif /* ENABLE_SVE_FOR_SWD */
+ #endif /* ENABLE_SVE_FOR_NS */
+#endif /* IMAGE_BL31 */
}
/*******************************************************************************
@@ -389,7 +467,8 @@ void cm_init_my_context(const entry_point_info_t *ep)
}
/*******************************************************************************
- * Prepare the CPU system registers for first entry into secure or normal world
+ * Prepare the CPU system registers for first entry into realm, secure, or
+ * normal world.
*
* If execution is requested to EL2 or hyp mode, SCTLR_EL2 is initialized
* If execution is requested to non-secure EL1 or svc mode, and the CPU supports
@@ -457,6 +536,8 @@ void cm_prepare_el3_exit(uint32_t security_state)
* CPTR_EL2.TTA: Set to zero so that Non-secure System
* register accesses to the trace registers from both
* Execution states do not trap to EL2.
+ * If PE trace unit System registers are not implemented
+ * then this bit is reserved, and must be set to zero.
*
* CPTR_EL2.TFP: Set to zero so that Non-secure accesses
* to SIMD and floating-point functionality from both
@@ -471,7 +552,7 @@ void cm_prepare_el3_exit(uint32_t security_state)
* architecturally UNKNOWN on reset and are set to zero
* except for field(s) listed below.
*
- * CNTHCTL_EL2.EL1PCEN: Set to one to disable traps to
+ * CNTHCTL_EL2.EL1PTEN: Set to one to disable traps to
* Hyp mode of Non-secure EL0 and EL1 accesses to the
* physical timer registers.
*
@@ -565,6 +646,11 @@ void cm_prepare_el3_exit(uint32_t security_state)
*
* MDCR_EL2.HPMN: Set to value of PMCR_EL0.N which is the
* architecturally-defined reset value.
+ *
+ * MDCR_EL2.E2TB: Set to zero so that the trace Buffer
+ * owning exception level is NS-EL1 and, tracing is
+ * prohibited at NS-EL2. These bits are RES0 when
+ * FEAT_TRBE is not implemented.
*/
mdcr_el2 = ((MDCR_EL2_RESET_VAL | MDCR_EL2_HLP |
MDCR_EL2_HPMD) |
@@ -574,7 +660,8 @@ void cm_prepare_el3_exit(uint32_t security_state)
MDCR_EL2_TDRA_BIT | MDCR_EL2_TDOSA_BIT |
MDCR_EL2_TDA_BIT | MDCR_EL2_TDE_BIT |
MDCR_EL2_HPME_BIT | MDCR_EL2_TPM_BIT |
- MDCR_EL2_TPMCR_BIT);
+ MDCR_EL2_TPMCR_BIT |
+ MDCR_EL2_E2TB(MDCR_EL2_E2TB_EL1));
write_mdcr_el2(mdcr_el2);
@@ -597,7 +684,7 @@ void cm_prepare_el3_exit(uint32_t security_state)
write_cnthp_ctl_el2(CNTHP_CTL_RESET_VAL &
~(CNTHP_CTL_ENABLE_BIT));
}
- enable_extensions_nonsecure(el2_unused, ctx);
+ manage_extensions_nonsecure(el2_unused, ctx);
}
cm_el1_sysregs_context_restore(security_state);
@@ -613,10 +700,10 @@ void cm_el2_sysregs_context_save(uint32_t security_state)
u_register_t scr_el3 = read_scr();
/*
- * Always save the non-secure EL2 context, only save the
+ * Always save the non-secure and realm EL2 context, only save the
* S-EL2 context if S-EL2 is enabled.
*/
- if ((security_state == NON_SECURE) ||
+ if ((security_state != SECURE) ||
((security_state == SECURE) && ((scr_el3 & SCR_EEL2_BIT) != 0U))) {
cpu_context_t *ctx;
@@ -635,10 +722,10 @@ void cm_el2_sysregs_context_restore(uint32_t security_state)
u_register_t scr_el3 = read_scr();
/*
- * Always restore the non-secure EL2 context, only restore the
+ * Always restore the non-secure and realm EL2 context, only restore the
* S-EL2 context if S-EL2 is enabled.
*/
- if ((security_state == NON_SECURE) ||
+ if ((security_state != SECURE) ||
((security_state == SECURE) && ((scr_el3 & SCR_EEL2_BIT) != 0U))) {
cpu_context_t *ctx;
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-24 23:52:23 +0000