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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
commit | 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch) | |
tree | bcf648efac40ca6139842707f0eba5a4496a6dd2 /services/spd/pncd/pncd_common.c | |
parent | Initial commit. (diff) | |
download | arm-trusted-firmware-upstream.tar.xz arm-trusted-firmware-upstream.zip |
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'services/spd/pncd/pncd_common.c')
-rw-r--r-- | services/spd/pncd/pncd_common.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/services/spd/pncd/pncd_common.c b/services/spd/pncd/pncd_common.c new file mode 100644 index 0000000..6fdb629 --- /dev/null +++ b/services/spd/pncd/pncd_common.c @@ -0,0 +1,102 @@ +/* + * 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(); +} |