AArch32: Add support in TF libraries
This patch adds AArch32 support to cpu ops, context management,
per-cpu data and spinlock libraries. The `entrypoint_info`
structure is modified to add support for AArch32 register
arguments. The CPU operations for AEM generic cpu in AArch32
mode is also added.
Change-Id: I1e52e79f498661d8f31f1e7b3a29e222bc7a4483
diff --git a/lib/el3_runtime/aarch32/context_mgmt.c b/lib/el3_runtime/aarch32/context_mgmt.c
new file mode 100644
index 0000000..6915ded
--- /dev/null
+++ b/lib/el3_runtime/aarch32/context_mgmt.c
@@ -0,0 +1,235 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <assert.h>
+#include <bl_common.h>
+#include <context.h>
+#include <context_mgmt.h>
+#include <platform.h>
+#include <platform_def.h>
+#include <smcc_helpers.h>
+#include <string.h>
+
+/*******************************************************************************
+ * Context management library initialisation routine. This library is used by
+ * runtime services to share pointers to 'cpu_context' structures for the secure
+ * and non-secure states. Management of the structures and their associated
+ * memory is not done by the context management library e.g. the PSCI service
+ * manages the cpu context used for entry from and exit to the non-secure state.
+ * The Secure payload manages the context(s) corresponding to the secure state.
+ * It also uses this library to get access to the non-secure
+ * state cpu context pointers.
+ ******************************************************************************/
+void cm_init(void)
+{
+ /*
+ * The context management library has only global data to initialize, but
+ * that will be done when the BSS is zeroed out
+ */
+}
+
+/*******************************************************************************
+ * The following function initializes the cpu_context 'ctx' for
+ * first use, and sets the initial entrypoint state as specified by the
+ * entry_point_info structure.
+ *
+ * The security state to initialize is determined by the SECURE attribute
+ * of the entry_point_info. The function returns a pointer to the initialized
+ * context and sets this as the next context to return to.
+ *
+ * The EE and ST attributes are used to configure the endianness and secure
+ * timer availability for the new execution context.
+ *
+ * To prepare the register state for entry call cm_prepare_el3_exit() and
+ * el3_exit(). For Secure-EL1 cm_prepare_el3_exit() is equivalent to
+ * cm_e1_sysreg_context_restore().
+ ******************************************************************************/
+static void cm_init_context_common(cpu_context_t *ctx, const entry_point_info_t *ep)
+{
+ unsigned int security_state;
+ uint32_t scr, sctlr;
+ regs_t *reg_ctx;
+
+ assert(ctx);
+
+ security_state = GET_SECURITY_STATE(ep->h.attr);
+
+ /* Clear any residual register values from the context */
+ memset(ctx, 0, sizeof(*ctx));
+
+ /*
+ * Base the context SCR on the current value, adjust for entry point
+ * specific requirements
+ */
+ scr = read_scr();
+ scr &= ~(SCR_NS_BIT | SCR_HCE_BIT);
+
+ if (security_state != SECURE)
+ scr |= SCR_NS_BIT;
+
+ /*
+ * Set up SCTLR for the Non Secure context.
+ * EE bit is taken from the entrypoint attributes
+ * M, C and I bits must be zero (as required by PSCI specification)
+ *
+ * The target exception level is based on the spsr mode requested.
+ * If execution is requested to hyp mode, HVC is enabled
+ * via SCR.HCE.
+ *
+ * Always compute the SCTLR_EL1 value and save in the cpu_context
+ * - the HYP registers are set up by cm_preapre_ns_entry() as they
+ * are not part of the stored cpu_context
+ *
+ * TODO: In debug builds the spsr should be validated and checked
+ * against the CPU support, security state, endianness and pc
+ */
+ if (security_state != SECURE) {
+ sctlr = EP_GET_EE(ep->h.attr) ? SCTLR_EE_BIT : 0;
+ sctlr |= SCTLR_RES1;
+ write_ctx_reg(reg_ctx, CTX_NS_SCTLR, sctlr);
+ }
+
+ if (GET_M32(ep->spsr) == MODE32_hyp)
+ scr |= SCR_HCE_BIT;
+
+ reg_ctx = get_regs_ctx(ctx);
+
+ write_ctx_reg(reg_ctx, CTX_SCR, scr);
+ write_ctx_reg(reg_ctx, CTX_LR, ep->pc);
+ write_ctx_reg(reg_ctx, CTX_SPSR, ep->spsr);
+
+ /*
+ * Store the r0-r3 value from the entrypoint into the context
+ * Use memcpy as we are in control of the layout of the structures
+ */
+ memcpy((void *)reg_ctx, (void *)&ep->args, sizeof(aapcs32_params_t));
+}
+
+/*******************************************************************************
+ * The following function initializes the cpu_context for a CPU specified by
+ * its `cpu_idx` for first use, and sets the initial entrypoint state as
+ * specified by the entry_point_info structure.
+ ******************************************************************************/
+void cm_init_context_by_index(unsigned int cpu_idx,
+ const entry_point_info_t *ep)
+{
+ cpu_context_t *ctx;
+ ctx = cm_get_context_by_index(cpu_idx, GET_SECURITY_STATE(ep->h.attr));
+ cm_init_context_common(ctx, ep);
+}
+
+/*******************************************************************************
+ * The following function initializes the cpu_context for the current CPU
+ * for first use, and sets the initial entrypoint state as specified by the
+ * entry_point_info structure.
+ ******************************************************************************/
+void cm_init_my_context(const entry_point_info_t *ep)
+{
+ cpu_context_t *ctx;
+ ctx = cm_get_context(GET_SECURITY_STATE(ep->h.attr));
+ cm_init_context_common(ctx, ep);
+}
+
+/*******************************************************************************
+ * Prepare the CPU system registers for first entry into secure or normal world
+ *
+ * If execution is requested to hyp mode, HSCTLR is initialized
+ * If execution is requested to non-secure PL1, and the CPU supports
+ * HYP mode then HYP mode is disabled by configuring all necessary HYP mode
+ * registers.
+ ******************************************************************************/
+void cm_prepare_el3_exit(uint32_t security_state)
+{
+ uint32_t sctlr, scr, hcptr;
+ cpu_context_t *ctx = cm_get_context(security_state);
+
+ assert(ctx);
+
+ if (security_state == NON_SECURE) {
+ scr = read_ctx_reg(get_regs_ctx(ctx), CTX_SCR);
+ if (scr & SCR_HCE_BIT) {
+ /* Use SCTLR value to initialize HSCTLR */
+ sctlr = read_ctx_reg(get_regs_ctx(ctx),
+ CTX_NS_SCTLR);
+ sctlr |= HSCTLR_RES1;
+ /* Temporarily set the NS bit to access HSCTLR */
+ write_scr(read_scr() | SCR_NS_BIT);
+ /*
+ * Make sure the write to SCR is complete so that
+ * we can access HSCTLR
+ */
+ isb();
+ write_hsctlr(sctlr);
+ isb();
+
+ write_scr(read_scr() & ~SCR_NS_BIT);
+ isb();
+ } else if (read_id_pfr1() &
+ (ID_PFR1_VIRTEXT_MASK << ID_PFR1_VIRTEXT_SHIFT)) {
+ /* Set the NS bit to access HCR, HCPTR, CNTHCTL, VPIDR, VMPIDR */
+ write_scr(read_scr() | SCR_NS_BIT);
+ isb();
+
+ /* PL2 present but unused, need to disable safely */
+ write_hcr(0);
+
+ /* HSCTLR : can be ignored when bypassing */
+
+ /* HCPTR : disable all traps TCPAC, TTA, TCP */
+ hcptr = read_hcptr();
+ hcptr &= ~(TCPAC_BIT | TTA_BIT | TCP11_BIT | TCP10_BIT);
+ write_hcptr(hcptr);
+
+ /* Enable EL1 access to timer */
+ write_cnthctl(PL1PCEN_BIT | PL1PCTEN_BIT);
+
+ /* Reset CNTVOFF_EL2 */
+ write64_cntvoff(0);
+
+ /* Set VPIDR, VMPIDR to match MIDR, MPIDR */
+ write_vpidr(read_midr());
+ write_vmpidr(read_mpidr());
+
+ /*
+ * Reset VTTBR.
+ * Needed because cache maintenance operations depend on
+ * the VMID even when non-secure EL1&0 stage 2 address
+ * translation are disabled.
+ */
+ write64_vttbr(0);
+ isb();
+
+ write_scr(read_scr() & ~SCR_NS_BIT);
+ isb();
+ }
+ }
+}
diff --git a/lib/el3_runtime/aarch32/cpu_data.S b/lib/el3_runtime/aarch32/cpu_data.S
new file mode 100644
index 0000000..b97911f
--- /dev/null
+++ b/lib/el3_runtime/aarch32/cpu_data.S
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <asm_macros.S>
+#include <cpu_data.h>
+
+ .globl _cpu_data
+ .globl _cpu_data_by_index
+
+/* -----------------------------------------------------------------
+ * cpu_data_t *_cpu_data(void)
+ *
+ * Return the cpu_data structure for the current CPU.
+ * -----------------------------------------------------------------
+ */
+func _cpu_data
+ push {lr}
+ bl plat_my_core_pos
+ pop {lr}
+ b _cpu_data_by_index
+endfunc _cpu_data
+
+/* -----------------------------------------------------------------
+ * cpu_data_t *_cpu_data_by_index(uint32_t cpu_index)
+ *
+ * Return the cpu_data structure for the CPU with given linear index
+ *
+ * This can be called without a valid stack.
+ * clobbers: r0, r1
+ * -----------------------------------------------------------------
+ */
+func _cpu_data_by_index
+ ldr r1, =percpu_data
+ add r0, r1, r0, LSL #CPU_DATA_LOG2SIZE
+ bx lr
+endfunc _cpu_data_by_index