blob: ab37be9c3f7df9b1501433b012b39f67cc23b029 [file] [log] [blame]
/*
* Copyright (c) 2018, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <asm_macros.S>
#include <assert_macros.S>
.globl zeromem
.globl memcpy4
.globl disable_mmu_icache
/* -----------------------------------------------------------------------
* void zeromem(void *mem, unsigned int length);
*
* Initialise a memory region to 0.
* The memory address and length must be 4-byte aligned.
* -----------------------------------------------------------------------
*/
func zeromem
#if ENABLE_ASSERTIONS
tst r0, #0x3
ASM_ASSERT(eq)
tst r1, #0x3
ASM_ASSERT(eq)
#endif
add r2, r0, r1
mov r1, #0
z_loop:
cmp r2, r0
beq z_end
str r1, [r0], #4
b z_loop
z_end:
bx lr
endfunc zeromem
/* --------------------------------------------------------------------------
* void memcpy4(void *dest, const void *src, unsigned int length)
*
* Copy length bytes from memory area src to memory area dest.
* The memory areas should not overlap.
* Destination and source addresses must be 4-byte aligned.
* --------------------------------------------------------------------------
*/
func memcpy4
#if ASM_ASSERTION
orr r3, r0, r1
tst r3, #0x3
ASM_ASSERT(eq)
#endif
/* copy 4 bytes at a time */
m_loop4:
cmp r2, #4
blt m_loop1
ldr r3, [r1], #4
str r3, [r0], #4
sub r2, r2, #4
b m_loop4
/* copy byte per byte */
m_loop1:
cmp r2,#0
beq m_end
ldrb r3, [r1], #1
strb r3, [r0], #1
subs r2, r2, #1
bne m_loop1
m_end:
bx lr
endfunc memcpy4
/* ---------------------------------------------------------------------------
* Disable the MMU in Secure State
* ---------------------------------------------------------------------------
*/
func disable_mmu
mov r1, #(HSCTLR_M_BIT | HSCTLR_C_BIT)
do_disable_mmu:
ldcopr r0, HSCTLR
bic r0, r0, r1
stcopr r0, HSCTLR
isb // ensure MMU is off
dsb sy
bx lr
endfunc disable_mmu
func disable_mmu_icache
ldr r1, =(HSCTLR_M_BIT | HSCTLR_C_BIT | HSCTLR_I_BIT)
b do_disable_mmu
endfunc disable_mmu_icache