/*
* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch.h>
#include <asm_macros.S>
#include <bl_common.h>
#include <context.h>
#include <el3_common_macros.S>
#include <runtime_svc.h>
#include <smcc_helpers.h>
#include <smcc_macros.S>
#include <xlat_tables.h>
.globl sp_min_vector_table
.globl sp_min_entrypoint
.globl sp_min_warm_entrypoint
vector_base sp_min_vector_table
b sp_min_entrypoint
b plat_panic_handler /* Undef */
b handle_smc /* Syscall */
b plat_panic_handler /* Prefetch abort */
b plat_panic_handler /* Data abort */
b plat_panic_handler /* Reserved */
b plat_panic_handler /* IRQ */
b plat_panic_handler /* FIQ */
/*
* The Cold boot/Reset entrypoint for SP_MIN
*/
func sp_min_entrypoint
#if !RESET_TO_SP_MIN
/* ---------------------------------------------------------------
* Preceding bootloader has populated r0 with a pointer to a
* 'bl_params_t' structure & r1 with a pointer to platform
* specific structure
* ---------------------------------------------------------------
*/
mov r11, r0
mov r12, r1
/* ---------------------------------------------------------------------
* For !RESET_TO_SP_MIN systems, only the primary CPU ever reaches
* sp_min_entrypoint() during the cold boot flow, so the cold/warm boot
* and primary/secondary CPU logic should not be executed in this case.
*
* Also, assume that the previous bootloader has already set up the CPU
* endianness and has initialised the memory.
* ---------------------------------------------------------------------
*/
el3_entrypoint_common \
_set_endian=0 \
_warm_boot_mailbox=0 \
_secondary_cold_boot=0 \
_init_memory=0 \
_init_c_runtime=1 \
_exception_vectors=sp_min_vector_table
/* ---------------------------------------------------------------------
* Relay the previous bootloader's arguments to the platform layer
* ---------------------------------------------------------------------
*/
mov r0, r11
mov r1, r12
#else
/* ---------------------------------------------------------------------
* For RESET_TO_SP_MIN systems which have a programmable reset address,
* sp_min_entrypoint() is executed only on the cold boot path so we can
* skip the warm boot mailbox mechanism.
* ---------------------------------------------------------------------
*/
el3_entrypoint_common \
_set_endian=1 \
_warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS \
_secondary_cold_boot=!COLD_BOOT_SINGLE_CPU \
_init_memory=1 \
_init_c_runtime=1 \
_exception_vectors=sp_min_vector_table
/* ---------------------------------------------------------------------
* For RESET_TO_SP_MIN systems, BL32 (SP_MIN) is the first bootloader
* to run so there's no argument to relay from a previous bootloader.
* Zero the arguments passed to the platform layer to reflect that.
* ---------------------------------------------------------------------
*/
mov r0, #0
mov r1, #0
#endif /* RESET_TO_SP_MIN */
bl sp_min_early_platform_setup
bl sp_min_plat_arch_setup
/* Jump to the main function */
bl sp_min_main
/* -------------------------------------------------------------
* Clean the .data & .bss sections to main memory. This ensures
* that any global data which was initialised by the primary CPU
* is visible to secondary CPUs before they enable their data
* caches and participate in coherency.
* -------------------------------------------------------------
*/
ldr r0, =__DATA_START__
ldr r1, =__DATA_END__
sub r1, r1, r0
bl clean_dcache_range
ldr r0, =__BSS_START__
ldr r1, =__BSS_END__
sub r1, r1, r0
bl clean_dcache_range
/* Program the registers in cpu_context and exit monitor mode */
mov r0, #NON_SECURE
bl cm_get_context
/* Restore the SCR */
ldr r2, [r0, #CTX_REGS_OFFSET + CTX_SCR]
stcopr r2, SCR
isb
/* Restore the SCTLR */
ldr r2, [r0, #CTX_REGS_OFFSET + CTX_NS_SCTLR]
stcopr r2, SCTLR
bl smc_get_next_ctx
/* The other cpu_context registers have been copied to smc context */
b sp_min_exit
endfunc sp_min_entrypoint
/*
* SMC handling function for SP_MIN.
*/
func handle_smc
smcc_save_gp_mode_regs
/* r0 points to smc_context */
mov r2, r0 /* handle */
ldcopr r0, SCR
/* Save SCR in stack */
push {r0}
and r3, r0, #SCR_NS_BIT /* flags */
/* Switch to Secure Mode*/
bic r0, #SCR_NS_BIT
stcopr r0, SCR
isb
ldr r0, [r2, #SMC_CTX_GPREG_R0] /* smc_fid */
/* Check whether an SMC64 is issued */
tst r0, #(FUNCID_CC_MASK << FUNCID_CC_SHIFT)
beq 1f /* SMC32 is detected */
mov r0, #SMC_UNK
str r0, [r2, #SMC_CTX_GPREG_R0]
mov r0, r2
b 2f /* Skip handling the SMC */
1:
mov r1, #0 /* cookie */
bl handle_runtime_svc
2:
/* r0 points to smc context */
/* Restore SCR from stack */
pop {r1}
stcopr r1, SCR
isb
b sp_min_exit
endfunc handle_smc
/*
* The Warm boot entrypoint for SP_MIN.
*/
func sp_min_warm_entrypoint
/*
* On the warm boot path, most of the EL3 initialisations performed by
* 'el3_entrypoint_common' must be skipped:
*
* - Only when the platform bypasses the BL1/BL32 (SP_MIN) entrypoint by
* programming the reset address do we need to set the CPU endianness.
* In other cases, we assume this has been taken care by the
* entrypoint code.
*
* - No need to determine the type of boot, we know it is a warm boot.
*
* - Do not try to distinguish between primary and secondary CPUs, this
* notion only exists for a cold boot.
*
* - No need to initialise the memory or the C runtime environment,
* it has been done once and for all on the cold boot path.
*/
el3_entrypoint_common \
_set_endian=PROGRAMMABLE_RESET_ADDRESS \
_warm_boot_mailbox=0 \
_secondary_cold_boot=0 \
_init_memory=0 \
_init_c_runtime=0 \
_exception_vectors=sp_min_vector_table
/* --------------------------------------------
* Enable the MMU with the DCache disabled. It
* is safe to use stacks allocated in normal
* memory as a result. All memory accesses are
* marked nGnRnE when the MMU is disabled. So
* all the stack writes will make it to memory.
* All memory accesses are marked Non-cacheable
* when the MMU is enabled but D$ is disabled.
* So used stack memory is guaranteed to be
* visible immediately after the MMU is enabled
* Enabling the DCache at the same time as the
* MMU can lead to speculatively fetched and
* possibly stale stack memory being read from
* other caches. This can lead to coherency
* issues.
* --------------------------------------------
*/
mov r0, #DISABLE_DCACHE
bl bl32_plat_enable_mmu
bl sp_min_warm_boot
/* Program the registers in cpu_context and exit monitor mode */
mov r0, #NON_SECURE
bl cm_get_context
/* Restore the SCR */
ldr r2, [r0, #CTX_REGS_OFFSET + CTX_SCR]
stcopr r2, SCR
isb
/* Restore the SCTLR */
ldr r2, [r0, #CTX_REGS_OFFSET + CTX_NS_SCTLR]
stcopr r2, SCTLR
bl smc_get_next_ctx
/* The other cpu_context registers have been copied to smc context */
b sp_min_exit
endfunc sp_min_warm_entrypoint
/*
* The function to restore the registers from SMC context and return
* to the mode restored to SPSR.
*
* Arguments : r0 must point to the SMC context to restore from.
*/
func sp_min_exit
smcc_restore_gp_mode_regs
eret
endfunc sp_min_exit
