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/*
* Copyright (c) 2021-2022, ProvenRun S.A.S. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <string.h>
#include <arch_helpers.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <lib/utils.h>
#include <plat/common/platform.h>
#include "pncd_private.h"
/*******************************************************************************
* Given a secure payload entrypoint info pointer, entry point PC & pointer to a
* context data structure, this function will initialize pnc context and entry
* point info for the secure payload
******************************************************************************/
void pncd_init_pnc_ep_state(struct entry_point_info *pnc_entry_point,
uint64_t pc,
pnc_context_t *pnc_ctx)
{
uint32_t ep_attr;
/* Passing a NULL context is a critical programming error */
assert(pnc_ctx);
assert(pnc_entry_point);
assert(pc);
/* Associate this context with the current cpu */
pnc_ctx->mpidr = read_mpidr();
cm_set_context(&pnc_ctx->cpu_ctx, SECURE);
/* initialise an entrypoint to set up the CPU context */
ep_attr = SECURE | EP_ST_ENABLE;
if (read_sctlr_el3() & SCTLR_EE_BIT) {
ep_attr |= EP_EE_BIG;
}
SET_PARAM_HEAD(pnc_entry_point, PARAM_EP, VERSION_1, ep_attr);
pnc_entry_point->pc = pc;
pnc_entry_point->spsr = SPSR_64(MODE_EL1,
MODE_SP_ELX,
DISABLE_ALL_EXCEPTIONS);
memset(&pnc_entry_point->args, 0, sizeof(pnc_entry_point->args));
}
/*******************************************************************************
* This function takes an SP context pointer and:
* 1. Applies the S-EL1 system register context from pnc_ctx->cpu_ctx.
* 2. Saves the current C runtime state (callee saved registers) on the stack
* frame and saves a reference to this state.
* 3. Calls el3_exit() so that the EL3 system and general purpose registers
* from the pnc_ctx->cpu_ctx are used to enter the secure payload image.
******************************************************************************/
uint64_t pncd_synchronous_sp_entry(pnc_context_t *pnc_ctx)
{
assert(pnc_ctx != NULL);
assert(pnc_ctx->c_rt_ctx == 0U);
/* Apply the Secure EL1 system register context and switch to it */
assert(cm_get_context(SECURE) == &pnc_ctx->cpu_ctx);
cm_el1_sysregs_context_restore(SECURE);
#if CTX_INCLUDE_FPREGS
fpregs_context_restore(get_fpregs_ctx(cm_get_context(SECURE)));
#endif
cm_set_next_eret_context(SECURE);
return pncd_enter_sp(&pnc_ctx->c_rt_ctx);
}
/*******************************************************************************
* This function takes an SP context pointer and:
* 1. Saves the S-EL1 system register context tp pnc_ctx->cpu_ctx.
* 2. Restores the current C runtime state (callee saved registers) from the
* stack frame using the reference to this state saved in pncd_enter_sp().
* 3. It does not need to save any general purpose or EL3 system register state
* as the generic smc entry routine should have saved those.
******************************************************************************/
void pncd_synchronous_sp_exit(pnc_context_t *pnc_ctx, uint64_t ret)
{
assert(pnc_ctx != NULL);
/* Save the Secure EL1 system register context */
assert(cm_get_context(SECURE) == &pnc_ctx->cpu_ctx);
cm_el1_sysregs_context_save(SECURE);
#if CTX_INCLUDE_FPREGS
fpregs_context_save(get_fpregs_ctx(cm_get_context(SECURE)));
#endif
assert(pnc_ctx->c_rt_ctx != 0);
pncd_exit_sp(pnc_ctx->c_rt_ctx, ret);
/* Should never reach here */
panic();
}
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