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/*
ChibiOS - Copyright (C) 2006..2017 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file SAMA5D2/boot.S
* @brief SAMA5D2 boot-related code managing the trusted zone.
*
* @addtogroup SAMA5D2_BOOT
* @{
*/
#if !defined(__DOXYGEN__)
.set SCR_NS, 0x01
.set SCR_IRQ, 0x02
.set SCR_FIQ, 0x04
.set SCR_EA, 0x08
.set SCR_FW, 0x10
.set SCR_AW, 0x20
.set AIC_REDIR_KEY, 0x5B6C0E26 << 1
.set SFR_SN1, 0xF8030050
.set SFR_AICREDIR, 0xF8030054
.set SFR_L2CC_HRAMC, 0xF8030058
.set L2CC_CR, 0x00A00100
.set SCR_RESET_VAL, (SCR_EA|SCR_IRQ)
.section .boot
.code 32
.balign 4
/*
* Boot initialization code
*/
.global Boot_Handler
Boot_Handler:
/*
* Set VBAR to system vectors table
* Set MVBAR to monitor vectors table
*/
ldr r0, =_start
mcr p15, 0, r0, c12, c0, 0
ldr r0, =_monitor_vectors
mcr p15, 0, r0, c12, c0, 1
/*
* Do not redirect secure interrupts to AIC
*/
ldr r0, =AIC_REDIR_KEY
ldr r1, =SFR_SN1
ldr r1, [r1]
eor r0, r0, r1
bic r0, r0, #0x1
ldr r1, =SFR_AICREDIR
str r0, [r1]
/*
* Reset SCTLR Settings
*/
mrc p15, 0, r0, c1, c0, 0 // Read CP15 System Control register
bic r0, r0, #(0x1 << 12) // Clear I bit 12 to disable I Cache
bic r0, r0, #(0x1 << 2) // Clear C bit 2 to disable D Cache
bic r0, r0, #0x1 // Clear M bit 0 to disable MMU
bic r0, r0, #(0x1 << 11) // Clear Z bit 11 to disable branch prediction
bic r0, r0, #(0x1 << 13) // Clear V bit 13 to disable hivecs
mcr p15, 0, r0, c1, c0, 0 // Write value back to CP15 System Control register
isb
/*
* Turn off L2Cache
*/
bic r0, r0, #0x1
ldr r1, =L2CC_CR
str r0, [r1]
/*
* Configure the L2 cache to be used as an internal SRAM
*/
bic r0, r0, #0x1
ldr r1, =SFR_L2CC_HRAMC
str r0, [r1]
/*
* Configure the intial catching of the interrupts
*/
ldr r0, =SCR_RESET_VAL // IRQ and ABT to monitor in secure mode
mcr p15, 0, r0, c1, c1, 0
b Reset_Handler
#endif /* !defined(__DOXYGEN__) */
/** @} */
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