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/*
* Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <platform_def.h>
#include <arch.h>
#include <arch_helpers.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <common/runtime_svc.h>
#include <context.h>
#include <drivers/console.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <lib/pmf/pmf.h>
#include <lib/psci/psci.h>
#include <lib/runtime_instr.h>
#include <lib/utils.h>
#include <plat/common/platform.h>
#include <platform_sp_min.h>
#include <services/std_svc.h>
#include <smccc_helpers.h>
#include "sp_min_private.h"
#if ENABLE_RUNTIME_INSTRUMENTATION
PMF_REGISTER_SERVICE_SMC(rt_instr_svc, PMF_RT_INSTR_SVC_ID,
RT_INSTR_TOTAL_IDS, PMF_STORE_ENABLE)
#endif
/* Pointers to per-core cpu contexts */
static void *sp_min_cpu_ctx_ptr[PLATFORM_CORE_COUNT];
/* SP_MIN only stores the non secure smc context */
static smc_ctx_t sp_min_smc_context[PLATFORM_CORE_COUNT];
/******************************************************************************
* Define the smccc helper library APIs
*****************************************************************************/
void *smc_get_ctx(unsigned int security_state)
{
assert(security_state == NON_SECURE);
return &sp_min_smc_context[plat_my_core_pos()];
}
void smc_set_next_ctx(unsigned int security_state)
{
assert(security_state == NON_SECURE);
/* SP_MIN stores only non secure smc context. Nothing to do here */
}
void *smc_get_next_ctx(void)
{
return &sp_min_smc_context[plat_my_core_pos()];
}
/*******************************************************************************
* This function returns a pointer to the most recent 'cpu_context' structure
* for the calling CPU that was set as the context for the specified security
* state. NULL is returned if no such structure has been specified.
******************************************************************************/
void *cm_get_context(uint32_t security_state)
{
assert(security_state == NON_SECURE);
return sp_min_cpu_ctx_ptr[plat_my_core_pos()];
}
/*******************************************************************************
* This function sets the pointer to the current 'cpu_context' structure for the
* specified security state for the calling CPU
******************************************************************************/
void cm_set_context(void *context, uint32_t security_state)
{
assert(security_state == NON_SECURE);
sp_min_cpu_ctx_ptr[plat_my_core_pos()] = context;
}
/*******************************************************************************
* This function returns a pointer to the most recent 'cpu_context' structure
* for the CPU identified by `cpu_idx` that was set as the context for the
* specified security state. NULL is returned if no such structure has been
* specified.
******************************************************************************/
void *cm_get_context_by_index(unsigned int cpu_idx,
unsigned int security_state)
{
assert(security_state == NON_SECURE);
return sp_min_cpu_ctx_ptr[cpu_idx];
}
/*******************************************************************************
* This function sets the pointer to the current 'cpu_context' structure for the
* specified security state for the CPU identified by CPU index.
******************************************************************************/
void cm_set_context_by_index(unsigned int cpu_idx, void *context,
unsigned int security_state)
{
assert(security_state == NON_SECURE);
sp_min_cpu_ctx_ptr[cpu_idx] = context;
}
static void copy_cpu_ctx_to_smc_stx(const regs_t *cpu_reg_ctx,
smc_ctx_t *next_smc_ctx)
{
next_smc_ctx->r0 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R0);
next_smc_ctx->r1 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R1);
next_smc_ctx->r2 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R2);
next_smc_ctx->lr_mon = read_ctx_reg(cpu_reg_ctx, CTX_LR);
next_smc_ctx->spsr_mon = read_ctx_reg(cpu_reg_ctx, CTX_SPSR);
next_smc_ctx->scr = read_ctx_reg(cpu_reg_ctx, CTX_SCR);
}
/*******************************************************************************
* This function invokes the PSCI library interface to initialize the
* non secure cpu context and copies the relevant cpu context register values
* to smc context. These registers will get programmed during `smc_exit`.
******************************************************************************/
static void sp_min_prepare_next_image_entry(void)
{
entry_point_info_t *next_image_info;
cpu_context_t *ctx = cm_get_context(NON_SECURE);
u_register_t ns_sctlr;
/* Program system registers to proceed to non-secure */
next_image_info = sp_min_plat_get_bl33_ep_info();
assert(next_image_info);
assert(NON_SECURE == GET_SECURITY_STATE(next_image_info->h.attr));
INFO("SP_MIN: Preparing exit to normal world\n");
psci_prepare_next_non_secure_ctx(next_image_info);
smc_set_next_ctx(NON_SECURE);
/* Copy r0, lr and spsr from cpu context to SMC context */
copy_cpu_ctx_to_smc_stx(get_regs_ctx(cm_get_context(NON_SECURE)),
smc_get_next_ctx());
/* Temporarily set the NS bit to access NS SCTLR */
write_scr(read_scr() | SCR_NS_BIT);
isb();
ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR);
write_sctlr(ns_sctlr);
isb();
write_scr(read_scr() & ~SCR_NS_BIT);
isb();
}
/******************************************************************************
* Implement the ARM Standard Service function to get arguments for a
* particular service.
*****************************************************************************/
uintptr_t get_arm_std_svc_args(unsigned int svc_mask)
{
/* Setup the arguments for PSCI Library */
DEFINE_STATIC_PSCI_LIB_ARGS_V1(psci_args, sp_min_warm_entrypoint);
/* PSCI is the only ARM Standard Service implemented */
assert(svc_mask == PSCI_FID_MASK);
return (uintptr_t)&psci_args;
}
/******************************************************************************
* The SP_MIN main function. Do the platform and PSCI Library setup. Also
* initialize the runtime service framework.
*****************************************************************************/
void sp_min_main(void)
{
NOTICE("SP_MIN: %s\n", version_string);
NOTICE("SP_MIN: %s\n", build_message);
/* Perform the SP_MIN platform setup */
sp_min_platform_setup();
/* Initialize the runtime services e.g. psci */
INFO("SP_MIN: Initializing runtime services\n");
runtime_svc_init();
/*
* We are ready to enter the next EL. Prepare entry into the image
* corresponding to the desired security state after the next ERET.
*/
sp_min_prepare_next_image_entry();
/*
* Perform any platform specific runtime setup prior to cold boot exit
* from SP_MIN.
*/
sp_min_plat_runtime_setup();
console_flush();
}
/******************************************************************************
* This function is invoked during warm boot. Invoke the PSCI library
* warm boot entry point which takes care of Architectural and platform setup/
* restore. Copy the relevant cpu_context register values to smc context which
* will get programmed during `smc_exit`.
*****************************************************************************/
void sp_min_warm_boot(void)
{
smc_ctx_t *next_smc_ctx;
cpu_context_t *ctx = cm_get_context(NON_SECURE);
u_register_t ns_sctlr;
psci_warmboot_entrypoint();
smc_set_next_ctx(NON_SECURE);
next_smc_ctx = smc_get_next_ctx();
zeromem(next_smc_ctx, sizeof(smc_ctx_t));
copy_cpu_ctx_to_smc_stx(get_regs_ctx(cm_get_context(NON_SECURE)),
next_smc_ctx);
/* Temporarily set the NS bit to access NS SCTLR */
write_scr(read_scr() | SCR_NS_BIT);
isb();
ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR);
write_sctlr(ns_sctlr);
isb();
write_scr(read_scr() & ~SCR_NS_BIT);
isb();
}
#if SP_MIN_WITH_SECURE_FIQ
/******************************************************************************
* This function is invoked on secure interrupts. By construction of the
* SP_MIN, secure interrupts can only be handled when core executes in non
* secure state.
*****************************************************************************/
void sp_min_fiq(void)
{
uint32_t id;
id = plat_ic_acknowledge_interrupt();
sp_min_plat_fiq_handler(id);
plat_ic_end_of_interrupt(id);
}
#endif /* SP_MIN_WITH_SECURE_FIQ */
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