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/*
* Copyright (c) 2015-2018, ARM Limited and Contributors. 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 <lib/el3_runtime/context_mgmt.h>
#include "tlkd_private.h"
#define AT_MASK 3
/*******************************************************************************
* This function helps the SP to translate NS/S virtual addresses.
******************************************************************************/
uint64_t tlkd_va_translate(uintptr_t va, int type)
{
uint64_t pa;
if (type & TLK_TRANSLATE_NS_VADDR) {
/* save secure context */
cm_el1_sysregs_context_save(SECURE);
/* restore non-secure context */
cm_el1_sysregs_context_restore(NON_SECURE);
/* switch NS bit to start using 64-bit, non-secure mappings */
write_scr(cm_get_scr_el3(NON_SECURE));
isb();
}
int at = type & AT_MASK;
switch (at) {
case 0:
AT(ats12e1r, va);
break;
case 1:
AT(ats12e1w, va);
break;
case 2:
AT(ats12e0r, va);
break;
case 3:
AT(ats12e0w, va);
break;
default:
assert(0); /* Unreachable */
break;
}
/* get the (NS/S) physical address */
isb();
pa = read_par_el1();
/* Restore secure state */
if (type & TLK_TRANSLATE_NS_VADDR) {
/* restore secure context */
cm_el1_sysregs_context_restore(SECURE);
/* switch NS bit to start using 32-bit, secure mappings */
write_scr(cm_get_scr_el3(SECURE));
isb();
}
return pa;
}
/*******************************************************************************
* Given a secure payload entrypoint, register width, cpu id & pointer to a
* context data structure, this function will create a secure context ready for
* programming an entry into the secure payload.
******************************************************************************/
void tlkd_init_tlk_ep_state(struct entry_point_info *tlk_entry_point,
uint32_t rw,
uint64_t pc,
tlk_context_t *tlk_ctx)
{
uint32_t ep_attr, spsr;
/* Passing a NULL context is a critical programming error */
assert(tlk_ctx);
assert(tlk_entry_point);
assert(pc);
/* Associate this context with the cpu specified */
tlk_ctx->mpidr = read_mpidr_el1();
clr_yield_smc_active_flag(tlk_ctx->state);
cm_set_context(&tlk_ctx->cpu_ctx, SECURE);
if (rw == SP_AARCH64)
spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS);
else
spsr = SPSR_MODE32(MODE32_svc,
SPSR_T_ARM,
read_sctlr_el3() & SCTLR_EE_BIT,
DISABLE_ALL_EXCEPTIONS);
/* 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(tlk_entry_point, PARAM_EP, VERSION_1, ep_attr);
tlk_entry_point->pc = pc;
tlk_entry_point->spsr = spsr;
}
/*******************************************************************************
* This function takes a TLK context pointer and:
* 1. Applies the S-EL1 system register context from tlk_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 tlk_ctx->cpu_ctx are used to enter the secure payload image.
******************************************************************************/
uint64_t tlkd_synchronous_sp_entry(tlk_context_t *tlk_ctx)
{
uint64_t rc;
/* Passing a NULL context is a critical programming error */
assert(tlk_ctx);
/* Apply the Secure EL1 system register context and switch to it */
assert(cm_get_context(SECURE) == &tlk_ctx->cpu_ctx);
cm_el1_sysregs_context_restore(SECURE);
cm_set_next_eret_context(SECURE);
rc = tlkd_enter_sp(&tlk_ctx->c_rt_ctx);
#if ENABLE_ASSERTIONS
tlk_ctx->c_rt_ctx = 0;
#endif
return rc;
}
/*******************************************************************************
* This function takes a TLK context pointer and:
* 1. Saves the S-EL1 system register context to tlk_ctx->cpu_ctx.
* 2. Restores the current C runtime state (callee saved registers) from the
* stack frame using reference to this state saved in tlkd_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 tlkd_synchronous_sp_exit(tlk_context_t *tlk_ctx, uint64_t ret)
{
/* Passing a NULL context is a critical programming error */
assert(tlk_ctx);
/* Save the Secure EL1 system register context */
assert(cm_get_context(SECURE) == &tlk_ctx->cpu_ctx);
cm_el1_sysregs_context_save(SECURE);
assert(tlk_ctx->c_rt_ctx != 0);
tlkd_exit_sp(tlk_ctx->c_rt_ctx, ret);
/* Should never reach here */
assert(0);
}
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