start.S
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/*
* (C) Copyright 2013
* David Feng <fenghua@phytium.com.cn>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <version.h>
#include <linux/linkage.h>
#include <asm/macro.h>
#include <asm/armv8/mmu.h>
/*************************************************************************
*
* Startup Code (reset vector)
*
*************************************************************************/
.globl _start
_start:
b reset
.align 3
.globl _TEXT_BASE
_TEXT_BASE:
.quad CONFIG_SYS_TEXT_BASE
/*
* These are defined in the linker script.
*/
.globl _end_ofs
_end_ofs:
.quad _end - _start
.globl _bss_start_ofs
_bss_start_ofs:
.quad __bss_start - _start
.globl _bss_end_ofs
_bss_end_ofs:
.quad __bss_end - _start
reset:
/*
* Could be EL3/EL2/EL1, Initial State:
* Little Endian, MMU Disabled, i/dCache Disabled
*/
adr x0, vectors
switch_el x1, 3f, 2f, 1f
3: msr vbar_el3, x0
msr cptr_el3, xzr /* Enable FP/SIMD */
ldr x0, =COUNTER_FREQUENCY
msr cntfrq_el0, x0 /* Initialize CNTFRQ */
b 0f
2: msr vbar_el2, x0
mov x0, #0x33ff
msr cptr_el2, x0 /* Enable FP/SIMD */
b 0f
1: msr vbar_el1, x0
mov x0, #3 << 20
msr cpacr_el1, x0 /* Enable FP/SIMD */
0:
/* Cache/BPB/TLB Invalidate */
bl __asm_flush_dcache_all /* dCache clean&invalidate */
bl __asm_invalidate_icache_all /* iCache invalidate */
bl __asm_invalidate_tlb_all /* invalidate TLBs */
/* Processor specific initialization */
bl lowlevel_init
branch_if_master x0, x1, master_cpu
/*
* Slave CPUs
*/
slave_cpu:
wfe
ldr x1, =CPU_RELEASE_ADDR
ldr x0, [x1]
cbz x0, slave_cpu
br x0 /* branch to the given address */
/*
* Master CPU
*/
master_cpu:
bl _main
/*-----------------------------------------------------------------------*/
WEAK(lowlevel_init)
/* Initialize GIC Secure Bank Status */
mov x29, lr /* Save LR */
bl gic_init
branch_if_master x0, x1, 1f
/*
* Slave should wait for master clearing spin table.
* This sync prevent salves observing incorrect
* value of spin table and jumping to wrong place.
*/
bl wait_for_wakeup
/*
* All processors will enter EL2 and optionally EL1.
*/
bl armv8_switch_to_el2
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
bl armv8_switch_to_el1
#endif
1:
mov lr, x29 /* Restore LR */
ret
ENDPROC(lowlevel_init)
/*-----------------------------------------------------------------------*/
ENTRY(c_runtime_cpu_setup)
/* Relocate vBAR */
adr x0, vectors
switch_el x1, 3f, 2f, 1f
3: msr vbar_el3, x0
b 0f
2: msr vbar_el2, x0
b 0f
1: msr vbar_el1, x0
0:
ret
ENDPROC(c_runtime_cpu_setup)