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/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <asm_macros.S>
#include <secure_partition.h>
#include <spm_svc.h>
#include <xlat_tables.h>
.globl cactus_entrypoint
func cactus_entrypoint
/*
* All the information needed to remap the memory of the Secure
* Partition is in the buffer whose pointer is passed on X0 and size on
* X1. If the size is 0, return with an error.
*/
cmp x1, #0
beq .return_error
/* Save the base address and size of the buffer. */
mov x20, x0
mov x21, x1
/* Size of the Secure Partition image. */
ldr x22, [x20, SP_BOOT_INFO_IMAGE_SIZE_OFFSET]
/*
* Remap all sections of the image before doing anything else.
*
* Not even the console can be initialized before because it needs to
* initialize variables (that can only be modified after remapping that
* region as RW).
*
* If any of the calls fails, loop, as there is no console to print an
* error message to.
*/
.macro set_sp_mem_attributes
cmp x2, #0 /* If size is 0, skip the call. */
beq 1f
mov_imm x0, SP_MEMORY_ATTRIBUTES_SET_AARCH64
svc #0
cmp x0, #0
bne .return_error
1:
.endm
adr x1, __TEXT_START__
adr x2, __TEXT_END__
sub x2, x2, x1 /* __TEXT_SIZE__ */
lsr x2, x2, PAGE_SIZE_SHIFT /* __TEXT_SIZE__ in pages */
mov x3, SP_MEMORY_ATTRIBUTES_ACCESS_RO | SP_MEMORY_ATTRIBUTES_EXEC
set_sp_mem_attributes
adr x1, __RODATA_START__
adr x2, __RODATA_END__
sub x2, x2, x1 /* __RODATA_SIZE__ */
lsr x2, x2, PAGE_SIZE_SHIFT /* __RODATA_SIZE__ in pages */
mov x3, SP_MEMORY_ATTRIBUTES_ACCESS_RO | SP_MEMORY_ATTRIBUTES_NON_EXEC
set_sp_mem_attributes
adr x1, __RWDATA_START__
adr x2, __RWDATA_END__
sub x2, x2, x1 /* __RWDATA_SIZE__ */
lsr x2, x2, PAGE_SIZE_SHIFT /* __RWDATA_SIZE__ in pages */
mov x3, SP_MEMORY_ATTRIBUTES_ACCESS_RW | SP_MEMORY_ATTRIBUTES_NON_EXEC
set_sp_mem_attributes
/*
* To avoid accessing it by mistake, prevent EL0 from accessing the rest
* of the memory reserved for the Secure Partition.
*
* Unused size = Total size - Used size
* = Total size - (__RWDATA_END__ - __TEXT_START__)
*/
adr x1, __RWDATA_END__
adr x2, __TEXT_START__
sub x2, x1, x2 /* x2 = Used size, x22 = Total size */
sub x2, x22, x2 /* x2 = Unused size */
lsr x2, x2, PAGE_SIZE_SHIFT /* Unused size in pages */
mov x3, SP_MEMORY_ATTRIBUTES_ACCESS_NOACCESS | SP_MEMORY_ATTRIBUTES_NON_EXEC
set_sp_mem_attributes
adr x0, __BSS_START__
adr x1, __BSS_END__
sub x1, x1, x0
bl zeromem16
/* Setup the stack pointer. */
ldr x0, [x20, SP_BOOT_INFO_STACK_BASE_OFFSET]
ldr x1, [x20, SP_BOOT_INFO_PCPU_STACK_SIZE_OFFSET]
add x0, x0, x1
mov sp, x0
/* And do the rest in C code */
mov x0, x20
mov x1, x21
bl cactus_main
/* Tell SPM that we are done initialising */
mov_imm x0, SP_EVENT_COMPLETE_AARCH64
mov x1, #0
svc #0
/* Loop forever */
b .
.return_error:
/* Tell SPM that the initialization failed. */
mov_imm x0, SP_EVENT_COMPLETE_AARCH64
mov x1, #1
svc #0
/* Loop forever */
b .
endfunc cactus_entrypoint
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