blob: 50c32fc832694700815dc05541574287b62a0688 [file] [log] [blame]
/*
* Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <arch_helpers.h>
#include <bl31/bl31.h>
#include <common/debug.h>
#include <common/runtime_svc.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <lib/smccc.h>
#include <lib/spinlock.h>
#include <lib/utils.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
#include <plat/common/common_def.h>
#include <plat/common/platform.h>
#include <platform_def.h>
#include <services/spci_svc.h>
#include <services/spmd_svc.h>
#include <smccc_helpers.h>
#include "spmd_private.h"
/*******************************************************************************
* SPM Core context information.
******************************************************************************/
spmd_spm_core_context_t spm_core_context[PLATFORM_CORE_COUNT];
/*******************************************************************************
* SPM Core attribute information read from its manifest.
******************************************************************************/
static spmc_manifest_sect_attribute_t spmc_attrs;
/*******************************************************************************
* SPM Core entry point information. Discovered on the primary core and reused
* on secondary cores.
******************************************************************************/
static entry_point_info_t *spmc_ep_info;
/*******************************************************************************
* Static function declaration.
******************************************************************************/
static int32_t spmd_init(void);
static int spmd_spmc_init(void *rd_base, size_t rd_size);
static uint64_t spmd_spci_error_return(void *handle, int error_code);
static uint64_t spmd_smc_forward(uint32_t smc_fid, uint32_t in_sstate,
uint32_t out_sstate, uint64_t x1,
uint64_t x2, uint64_t x3, uint64_t x4,
void *handle);
/*******************************************************************************
* This function takes an SP context pointer and performs a synchronous entry
* into it.
******************************************************************************/
uint64_t spmd_spm_core_sync_entry(spmd_spm_core_context_t *spmc_ctx)
{
uint64_t rc;
assert(spmc_ctx != NULL);
cm_set_context(&(spmc_ctx->cpu_ctx), SECURE);
/* Restore the context assigned above */
cm_el1_sysregs_context_restore(SECURE);
cm_el2_sysregs_context_restore(SECURE);
cm_set_next_eret_context(SECURE);
/* Invalidate TLBs at EL1. */
tlbivmalle1();
dsbish();
/* Enter Secure Partition */
rc = spmd_spm_core_enter(&spmc_ctx->c_rt_ctx);
/* Save secure state */
cm_el1_sysregs_context_save(SECURE);
cm_el2_sysregs_context_save(SECURE);
return rc;
}
/*******************************************************************************
* This function returns to the place where spm_sp_synchronous_entry() was
* called originally.
******************************************************************************/
__dead2 void spmd_spm_core_sync_exit(uint64_t rc)
{
spmd_spm_core_context_t *ctx = &spm_core_context[plat_my_core_pos()];
/* Get context of the SP in use by this CPU. */
assert(cm_get_context(SECURE) == &(ctx->cpu_ctx));
/*
* The SPMD must have initiated the original request through a
* synchronous entry into SPMC. Jump back to the original C runtime
* context with the value of rc in x0;
*/
spmd_spm_core_exit(ctx->c_rt_ctx, rc);
panic();
}
/*******************************************************************************
* Jump to the SPM core for the first time.
******************************************************************************/
static int32_t spmd_init(void)
{
uint64_t rc = 0;
spmd_spm_core_context_t *ctx = &spm_core_context[plat_my_core_pos()];
INFO("SPM Core init start.\n");
ctx->state = SPMC_STATE_RESET;
rc = spmd_spm_core_sync_entry(ctx);
if (rc) {
ERROR("SPMC initialisation failed 0x%llx\n", rc);
panic();
}
ctx->state = SPMC_STATE_IDLE;
INFO("SPM Core init end.\n");
return 1;
}
/*******************************************************************************
* Load SPMC manifest, init SPMC.
******************************************************************************/
static int spmd_spmc_init(void *rd_base, size_t rd_size)
{
int rc;
uint32_t ep_attr;
unsigned int linear_id = plat_my_core_pos();
spmd_spm_core_context_t *spm_ctx = &spm_core_context[linear_id];
/* Load the SPM core manifest */
rc = plat_spm_core_manifest_load(&spmc_attrs, rd_base, rd_size);
if (rc != 0) {
WARN("No or invalid SPM core manifest image provided by BL2 "
"boot loader. ");
return 1;
}
/*
* Ensure that the SPM core version is compatible with the SPM
* dispatcher version
*/
if ((spmc_attrs.major_version != SPCI_VERSION_MAJOR) ||
(spmc_attrs.minor_version > SPCI_VERSION_MINOR)) {
WARN("Unsupported SPCI version (%x.%x) specified in SPM core "
"manifest image provided by BL2 boot loader.\n",
spmc_attrs.major_version, spmc_attrs.minor_version);
return 1;
}
INFO("SPCI version (%x.%x).\n", spmc_attrs.major_version,
spmc_attrs.minor_version);
/* Validate the SPM core runtime EL */
if ((spmc_attrs.runtime_el != MODE_EL1) &&
(spmc_attrs.runtime_el != MODE_EL2)) {
WARN("Unsupported SPM core run time EL%x specified in "
"manifest image provided by BL2 boot loader.\n",
spmc_attrs.runtime_el);
return 1;
}
INFO("SPM core run time EL%x.\n", spmc_attrs.runtime_el);
/* Validate the SPM core execution state */
if ((spmc_attrs.exec_state != MODE_RW_64) &&
(spmc_attrs.exec_state != MODE_RW_32)) {
WARN("Unsupported SPM core execution state %x specified in "
"manifest image provided by BL2 boot loader.\n",
spmc_attrs.exec_state);
return 1;
}
INFO("SPM core execution state %x.\n", spmc_attrs.exec_state);
/* Ensure manifest has not requested S-EL2 in AArch32 state */
if ((spmc_attrs.exec_state == MODE_RW_32) &&
(spmc_attrs.runtime_el == MODE_EL2)) {
WARN("Invalid combination of SPM core execution state (%x) "
"and run time EL (%x).\n", spmc_attrs.exec_state,
spmc_attrs.runtime_el);
return 1;
}
/*
* Check if S-EL2 is supported on this system if S-EL2
* is required for SPM
*/
if (spmc_attrs.runtime_el == MODE_EL2) {
uint64_t sel2 = read_id_aa64pfr0_el1();
sel2 >>= ID_AA64PFR0_SEL2_SHIFT;
sel2 &= ID_AA64PFR0_SEL2_MASK;
if (!sel2) {
WARN("SPM core run time EL: S-EL%x is not supported "
"but specified in manifest image provided by "
"BL2 boot loader.\n", spmc_attrs.runtime_el);
return 1;
}
}
/* 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(spmc_ep_info, PARAM_EP, VERSION_1, ep_attr);
assert(spmc_ep_info->pc == BL32_BASE);
/*
* Populate SPSR for SPM core based upon validated parameters from the
* manifest
*/
if (spmc_attrs.exec_state == MODE_RW_32) {
spmc_ep_info->spsr = SPSR_MODE32(MODE32_svc, SPSR_T_ARM,
SPSR_E_LITTLE,
DAIF_FIQ_BIT |
DAIF_IRQ_BIT |
DAIF_ABT_BIT);
} else {
spmc_ep_info->spsr = SPSR_64(spmc_attrs.runtime_el,
MODE_SP_ELX,
DISABLE_ALL_EXCEPTIONS);
}
/* Initialise SPM core context with this entry point information */
cm_setup_context(&spm_ctx->cpu_ctx, spmc_ep_info);
/* Reuse PSCI affinity states to mark this SPMC context as off */
spm_ctx->state = AFF_STATE_OFF;
INFO("SPM core setup done.\n");
/* Register init function for deferred init. */
bl31_register_bl32_init(&spmd_init);
return 0;
}
/*******************************************************************************
* Initialize context of SPM core.
******************************************************************************/
int spmd_setup(void)
{
int rc;
void *rd_base;
size_t rd_size;
uintptr_t rd_base_align;
uintptr_t rd_size_align;
spmc_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
if (!spmc_ep_info) {
WARN("No SPM core image provided by BL2 boot loader, Booting "
"device without SP initialization. SMC`s destined for SPM "
"core will return SMC_UNK\n");
return 1;
}
/* Under no circumstances will this parameter be 0 */
assert(spmc_ep_info->pc != 0U);
/*
* Check if BL32 ep_info has a reference to 'tos_fw_config'. This will
* be used as a manifest for the SPM core at the next lower EL/mode.
*/
if (spmc_ep_info->args.arg0 == 0U || spmc_ep_info->args.arg2 == 0U) {
ERROR("Invalid or absent SPM core manifest\n");
panic();
}
/* Obtain whereabouts of SPM core manifest */
rd_base = (void *) spmc_ep_info->args.arg0;
rd_size = spmc_ep_info->args.arg2;
rd_base_align = page_align((uintptr_t) rd_base, DOWN);
rd_size_align = page_align((uintptr_t) rd_size, UP);
/* Map the manifest in the SPMD translation regime first */
VERBOSE("SPM core manifest base : 0x%lx\n", rd_base_align);
VERBOSE("SPM core manifest size : 0x%lx\n", rd_size_align);
rc = mmap_add_dynamic_region((unsigned long long) rd_base_align,
(uintptr_t) rd_base_align,
rd_size_align,
MT_RO_DATA);
if (rc != 0) {
ERROR("Error while mapping SPM core manifest (%d).\n", rc);
panic();
}
/* Load manifest, init SPMC */
rc = spmd_spmc_init(rd_base, rd_size);
if (rc != 0) {
int mmap_rc;
WARN("Booting device without SPM initialization. "
"SPCI SMCs destined for SPM core will return "
"ENOTSUPPORTED\n");
mmap_rc = mmap_remove_dynamic_region(rd_base_align,
rd_size_align);
if (mmap_rc != 0) {
ERROR("Error while unmapping SPM core manifest (%d).\n",
mmap_rc);
panic();
}
return rc;
}
return 0;
}
/*******************************************************************************
* Forward SMC to the other security state
******************************************************************************/
static uint64_t spmd_smc_forward(uint32_t smc_fid, uint32_t in_sstate,
uint32_t out_sstate, uint64_t x1,
uint64_t x2, uint64_t x3, uint64_t x4,
void *handle)
{
/* Save incoming security state */
cm_el1_sysregs_context_save(in_sstate);
cm_el2_sysregs_context_save(in_sstate);
/* Restore outgoing security state */
cm_el1_sysregs_context_restore(out_sstate);
cm_el2_sysregs_context_restore(out_sstate);
cm_set_next_eret_context(out_sstate);
SMC_RET8(cm_get_context(out_sstate), smc_fid, x1, x2, x3, x4,
SMC_GET_GP(handle, CTX_GPREG_X5),
SMC_GET_GP(handle, CTX_GPREG_X6),
SMC_GET_GP(handle, CTX_GPREG_X7));
}
/*******************************************************************************
* Return SPCI_ERROR with specified error code
******************************************************************************/
static uint64_t spmd_spci_error_return(void *handle, int error_code)
{
SMC_RET8(handle, SPCI_ERROR,
SPCI_TARGET_INFO_MBZ, error_code,
SPCI_PARAM_MBZ, SPCI_PARAM_MBZ, SPCI_PARAM_MBZ,
SPCI_PARAM_MBZ, SPCI_PARAM_MBZ);
}
/*******************************************************************************
* This function handles all SMCs in the range reserved for SPCI. Each call is
* either forwarded to the other security state or handled by the SPM dispatcher
******************************************************************************/
uint64_t spmd_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
uint64_t x3, uint64_t x4, void *cookie, void *handle,
uint64_t flags)
{
uint32_t in_sstate;
uint32_t out_sstate;
int32_t ret;
spmd_spm_core_context_t *ctx = &spm_core_context[plat_my_core_pos()];
/* Determine which security state this SMC originated from */
if (is_caller_secure(flags)) {
in_sstate = SECURE;
out_sstate = NON_SECURE;
} else {
in_sstate = NON_SECURE;
out_sstate = SECURE;
}
INFO("SPM: 0x%x, 0x%llx, 0x%llx, 0x%llx, 0x%llx, "
"0x%llx, 0x%llx, 0x%llx\n",
smc_fid, x1, x2, x3, x4, SMC_GET_GP(handle, CTX_GPREG_X5),
SMC_GET_GP(handle, CTX_GPREG_X6),
SMC_GET_GP(handle, CTX_GPREG_X7));
switch (smc_fid) {
case SPCI_ERROR:
/*
* Check if this is the first invocation of this interface on
* this CPU. If so, then indicate that the SPM core initialised
* unsuccessfully.
*/
if ((in_sstate == SECURE) &&
(ctx->state == SPMC_STATE_RESET)) {
spmd_spm_core_sync_exit(x2);
}
return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
x1, x2, x3, x4, handle);
break; /* not reached */
case SPCI_VERSION:
/*
* TODO: This is an optimization that the version information
* provided by the SPM core manifest is returned by the SPM
* dispatcher. It might be a better idea to simply forward this
* call to the SPM core and wash our hands completely.
*/
ret = MAKE_SPCI_VERSION(spmc_attrs.major_version,
spmc_attrs.minor_version);
SMC_RET8(handle, SPCI_SUCCESS_SMC32, SPCI_TARGET_INFO_MBZ, ret,
SPCI_PARAM_MBZ, SPCI_PARAM_MBZ, SPCI_PARAM_MBZ,
SPCI_PARAM_MBZ, SPCI_PARAM_MBZ);
break; /* not reached */
case SPCI_FEATURES:
/*
* This is an optional interface. Do the minimal checks and
* forward to SPM core which will handle it if implemented.
*/
/*
* Check if x1 holds a valid SPCI fid. This is an
* optimization.
*/
if (!is_spci_fid(x1)) {
return spmd_spci_error_return(handle,
SPCI_ERROR_NOT_SUPPORTED);
}
/* Forward SMC from Normal world to the SPM core */
if (in_sstate == NON_SECURE) {
return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
x1, x2, x3, x4, handle);
} else {
/*
* Return success if call was from secure world i.e. all
* SPCI functions are supported. This is essentially a
* nop.
*/
SMC_RET8(handle, SPCI_SUCCESS_SMC32, x1, x2, x3, x4,
SMC_GET_GP(handle, CTX_GPREG_X5),
SMC_GET_GP(handle, CTX_GPREG_X6),
SMC_GET_GP(handle, CTX_GPREG_X7));
}
break; /* not reached */
case SPCI_RX_RELEASE:
case SPCI_RXTX_MAP_SMC32:
case SPCI_RXTX_MAP_SMC64:
case SPCI_RXTX_UNMAP:
case SPCI_MSG_RUN:
/* This interface must be invoked only by the Normal world */
if (in_sstate == SECURE) {
return spmd_spci_error_return(handle,
SPCI_ERROR_NOT_SUPPORTED);
}
/* Fall through to forward the call to the other world */
case SPCI_PARTITION_INFO_GET:
case SPCI_MSG_SEND:
case SPCI_MSG_SEND_DIRECT_REQ_SMC32:
case SPCI_MSG_SEND_DIRECT_REQ_SMC64:
case SPCI_MSG_SEND_DIRECT_RESP_SMC32:
case SPCI_MSG_SEND_DIRECT_RESP_SMC64:
case SPCI_MEM_DONATE_SMC32:
case SPCI_MEM_DONATE_SMC64:
case SPCI_MEM_LEND_SMC32:
case SPCI_MEM_LEND_SMC64:
case SPCI_MEM_SHARE_SMC32:
case SPCI_MEM_SHARE_SMC64:
case SPCI_MEM_RETRIEVE_REQ_SMC32:
case SPCI_MEM_RETRIEVE_REQ_SMC64:
case SPCI_MEM_RETRIEVE_RESP:
case SPCI_MEM_RELINQUISH:
case SPCI_MEM_RECLAIM:
case SPCI_SUCCESS_SMC32:
case SPCI_SUCCESS_SMC64:
/*
* TODO: Assume that no requests originate from EL3 at the
* moment. This will change if a SP service is required in
* response to secure interrupts targeted to EL3. Until then
* simply forward the call to the Normal world.
*/
return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
x1, x2, x3, x4, handle);
break; /* not reached */
case SPCI_MSG_WAIT:
/*
* Check if this is the first invocation of this interface on
* this CPU from the Secure world. If so, then indicate that the
* SPM core initialised successfully.
*/
if ((in_sstate == SECURE) && (ctx->state == SPMC_STATE_RESET)) {
spmd_spm_core_sync_exit(0);
}
/* Fall through to forward the call to the other world */
case SPCI_MSG_YIELD:
/* This interface must be invoked only by the Secure world */
if (in_sstate == NON_SECURE) {
return spmd_spci_error_return(handle,
SPCI_ERROR_NOT_SUPPORTED);
}
return spmd_smc_forward(smc_fid, in_sstate, out_sstate,
x1, x2, x3, x4, handle);
break; /* not reached */
default:
WARN("SPM: Unsupported call 0x%08x\n", smc_fid);
return spmd_spci_error_return(handle, SPCI_ERROR_NOT_SUPPORTED);
}
}