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/*
* 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 <assert_macros.S>
.globl smc
.globl zeromem
.globl memcpy4
.globl disable_mmu_icache_secure
.globl disable_mmu_secure
func smc
/*
* For AArch32 only r0-r3 will be in the registers;
* rest r4-r6 will be pushed on to the stack. So here, we'll
* have to load them from the stack to registers r4-r6 explicitly.
* Clobbers: r4-r6
*/
ldm sp, {r4, r5, r6}
smc #0
endfunc smc
/* -----------------------------------------------------------------------
* 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 ASM_ASSERTION
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_secure
mov r1, #(SCTLR_M_BIT | SCTLR_C_BIT)
do_disable_mmu:
ldcopr r0, SCTLR
bic r0, r0, r1
stcopr r0, SCTLR
isb // ensure MMU is off
dsb sy
bx lr
endfunc disable_mmu_secure
func disable_mmu_icache_secure
ldr r1, =(SCTLR_M_BIT | SCTLR_C_BIT | SCTLR_I_BIT)
b do_disable_mmu
endfunc disable_mmu_icache_secure
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