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166 lines
4.7 KiB
166 lines
4.7 KiB
/*
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* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <string.h>
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#include <arch_helpers.h>
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#include <common/bl_common.h>
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#include <lib/el3_runtime/context_mgmt.h>
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#include "tlkd_private.h"
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#define AT_MASK 3
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/*******************************************************************************
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* This function helps the SP to translate NS/S virtual addresses.
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******************************************************************************/
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uint64_t tlkd_va_translate(uintptr_t va, int type)
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{
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uint64_t pa;
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if (type & TLK_TRANSLATE_NS_VADDR) {
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/* save secure context */
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cm_el1_sysregs_context_save(SECURE);
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/* restore non-secure context */
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cm_el1_sysregs_context_restore(NON_SECURE);
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/* switch NS bit to start using 64-bit, non-secure mappings */
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write_scr(cm_get_scr_el3(NON_SECURE));
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isb();
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}
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int at = type & AT_MASK;
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switch (at) {
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case 0:
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AT(ats12e1r, va);
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break;
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case 1:
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AT(ats12e1w, va);
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break;
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case 2:
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AT(ats12e0r, va);
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break;
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case 3:
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AT(ats12e0w, va);
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break;
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default:
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assert(0); /* Unreachable */
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break;
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}
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/* get the (NS/S) physical address */
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isb();
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pa = read_par_el1();
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/* Restore secure state */
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if (type & TLK_TRANSLATE_NS_VADDR) {
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/* restore secure context */
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cm_el1_sysregs_context_restore(SECURE);
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/* switch NS bit to start using 32-bit, secure mappings */
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write_scr(cm_get_scr_el3(SECURE));
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isb();
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}
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return pa;
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}
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/*******************************************************************************
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* Given a secure payload entrypoint, register width, cpu id & pointer to a
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* context data structure, this function will create a secure context ready for
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* programming an entry into the secure payload.
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******************************************************************************/
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void tlkd_init_tlk_ep_state(struct entry_point_info *tlk_entry_point,
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uint32_t rw,
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uint64_t pc,
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tlk_context_t *tlk_ctx)
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{
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uint32_t ep_attr, spsr;
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/* Passing a NULL context is a critical programming error */
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assert(tlk_ctx);
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assert(tlk_entry_point);
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assert(pc);
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/* Associate this context with the cpu specified */
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tlk_ctx->mpidr = read_mpidr_el1();
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clr_yield_smc_active_flag(tlk_ctx->state);
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cm_set_context(&tlk_ctx->cpu_ctx, SECURE);
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if (rw == SP_AARCH64)
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spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS);
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else
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spsr = SPSR_MODE32(MODE32_svc,
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SPSR_T_ARM,
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read_sctlr_el3() & SCTLR_EE_BIT,
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DISABLE_ALL_EXCEPTIONS);
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/* initialise an entrypoint to set up the CPU context */
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ep_attr = SECURE | EP_ST_ENABLE;
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if (read_sctlr_el3() & SCTLR_EE_BIT)
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ep_attr |= EP_EE_BIG;
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SET_PARAM_HEAD(tlk_entry_point, PARAM_EP, VERSION_1, ep_attr);
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tlk_entry_point->pc = pc;
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tlk_entry_point->spsr = spsr;
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}
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/*******************************************************************************
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* This function takes a TLK context pointer and:
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* 1. Applies the S-EL1 system register context from tlk_ctx->cpu_ctx.
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* 2. Saves the current C runtime state (callee saved registers) on the stack
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* frame and saves a reference to this state.
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* 3. Calls el3_exit() so that the EL3 system and general purpose registers
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* from the tlk_ctx->cpu_ctx are used to enter the secure payload image.
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******************************************************************************/
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uint64_t tlkd_synchronous_sp_entry(tlk_context_t *tlk_ctx)
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{
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uint64_t rc;
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/* Passing a NULL context is a critical programming error */
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assert(tlk_ctx);
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/* Apply the Secure EL1 system register context and switch to it */
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assert(cm_get_context(SECURE) == &tlk_ctx->cpu_ctx);
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cm_el1_sysregs_context_restore(SECURE);
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cm_set_next_eret_context(SECURE);
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rc = tlkd_enter_sp(&tlk_ctx->c_rt_ctx);
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#if ENABLE_ASSERTIONS
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tlk_ctx->c_rt_ctx = 0;
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#endif
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return rc;
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}
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/*******************************************************************************
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* This function takes a TLK context pointer and:
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* 1. Saves the S-EL1 system register context to tlk_ctx->cpu_ctx.
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* 2. Restores the current C runtime state (callee saved registers) from the
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* stack frame using reference to this state saved in tlkd_enter_sp().
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* 3. It does not need to save any general purpose or EL3 system register state
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* as the generic smc entry routine should have saved those.
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******************************************************************************/
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void tlkd_synchronous_sp_exit(tlk_context_t *tlk_ctx, uint64_t ret)
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{
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/* Passing a NULL context is a critical programming error */
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assert(tlk_ctx);
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/* Save the Secure EL1 system register context */
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assert(cm_get_context(SECURE) == &tlk_ctx->cpu_ctx);
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cm_el1_sysregs_context_save(SECURE);
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assert(tlk_ctx->c_rt_ctx != 0);
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tlkd_exit_sp(tlk_ctx->c_rt_ctx, ret);
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/* Should never reach here */
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assert(0);
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}
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