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/*
* include/asm-arm/macro.h
*
* Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_ARM_MACRO_H__
#define __ASM_ARM_MACRO_H__
#ifdef __ASSEMBLY__
/*
* These macros provide a convenient way to write 8, 16 and 32 bit data
* to any address.
* Registers r4 and r5 are used, any data in these registers are
* overwritten by the macros.
* The macros are valid for any ARM architecture, they do not implement
* any memory barriers so caution is recommended when using these when the
* caches are enabled or on a multi-core system.
*/
.macro write32, addr, data
ldr r4, =\addr
ldr r5, =\data
str r5, [r4]
.endm
.macro write16, addr, data
ldr r4, =\addr
ldrh r5, =\data
strh r5, [r4]
.endm
.macro write8, addr, data
ldr r4, =\addr
ldrb r5, =\data
strb r5, [r4]
.endm
/*
* This macro generates a loop that can be used for delays in the code.
* Register r4 is used, any data in this register is overwritten by the
* macro.
* The macro is valid for any ARM architeture. The actual time spent in the
* loop will vary from CPU to CPU though.
*/
.macro wait_timer, time
ldr r4, =\time
1:
nop
subs r4, r4, #1
bcs 1b
.endm
#ifdef CONFIG_ARM64
/*
* Register aliases.
*/
lr .req x30
/*
* Branch according to exception level
*/
.macro switch_el, xreg, el3_label, el2_label, el1_label
mrs \xreg, CurrentEL
cmp \xreg, 0xc
b.eq \el3_label
cmp \xreg, 0x8
b.eq \el2_label
cmp \xreg, 0x4
b.eq \el1_label
.endm
/*
* Branch if current processor is a Cortex-A57 core.
*/
.macro branch_if_a57_core, xreg, a57_label
mrs \xreg, midr_el1
lsr \xreg, \xreg, #4
and \xreg, \xreg, #0x00000FFF
cmp \xreg, #0xD07 /* Cortex-A57 MPCore processor. */
b.eq \a57_label
.endm
/*
* Branch if current processor is a Cortex-A53 core.
*/
.macro branch_if_a53_core, xreg, a53_label
mrs \xreg, midr_el1
lsr \xreg, \xreg, #4
and \xreg, \xreg, #0x00000FFF
cmp \xreg, #0xD03 /* Cortex-A53 MPCore processor. */
b.eq \a53_label
.endm
/*
* Branch if current processor is a slave,
* choose processor with all zero affinity value as the master.
*/
.macro branch_if_slave, xreg, slave_label
#ifdef CONFIG_ARMV8_MULTIENTRY
/* NOTE: MPIDR handling will be erroneous on multi-cluster machines */
mrs \xreg, mpidr_el1
tst \xreg, #0xff /* Test Affinity 0 */
b.ne \slave_label
lsr \xreg, \xreg, #8
tst \xreg, #0xff /* Test Affinity 1 */
b.ne \slave_label
lsr \xreg, \xreg, #8
tst \xreg, #0xff /* Test Affinity 2 */
b.ne \slave_label
lsr \xreg, \xreg, #16
tst \xreg, #0xff /* Test Affinity 3 */
b.ne \slave_label
#endif
.endm
/*
* Branch if current processor is a master,
* choose processor with all zero affinity value as the master.
*/
.macro branch_if_master, xreg1, xreg2, master_label
#ifdef CONFIG_ARMV8_MULTIENTRY
/* NOTE: MPIDR handling will be erroneous on multi-cluster machines */
mrs \xreg1, mpidr_el1
lsr \xreg2, \xreg1, #32
lsl \xreg1, \xreg1, #40
lsr \xreg1, \xreg1, #40
orr \xreg1, \xreg1, \xreg2
cbz \xreg1, \master_label
#else
b \master_label
#endif
.endm
.macro armv8_switch_to_el2_m, xreg1
/* 64bit EL2 | HCE | SMD | RES1 (Bits[5:4]) | Non-secure EL0/EL1 */
mov \xreg1, #0x5b1
msr scr_el3, \xreg1
msr cptr_el3, xzr /* Disable coprocessor traps to EL3 */
mov \xreg1, #0x33ff
msr cptr_el2, \xreg1 /* Disable coprocessor traps to EL2 */
/* Initialize SCTLR_EL2
*
* setting RES1 bits (29,28,23,22,18,16,11,5,4) to 1
* and RES0 bits (31,30,27,26,24,21,20,17,15-13,10-6) +
* EE,WXN,I,SA,C,A,M to 0
*/
mov \xreg1, #0x0830
movk \xreg1, #0x30C5, lsl #16
msr sctlr_el2, \xreg1
/* Return to the EL2_SP2 mode from EL3 */
mov \xreg1, sp
msr sp_el2, \xreg1 /* Migrate SP */
mrs \xreg1, vbar_el3
msr vbar_el2, \xreg1 /* Migrate VBAR */
mov \xreg1, #0x3c9
msr spsr_el3, \xreg1 /* EL2_SP2 | D | A | I | F */
msr elr_el3, lr
eret
.endm
.macro armv8_switch_to_el1_m, xreg1, xreg2
/* Initialize Generic Timers */
mrs \xreg1, cnthctl_el2
orr \xreg1, \xreg1, #0x3 /* Enable EL1 access to timers */
msr cnthctl_el2, \xreg1
msr cntvoff_el2, xzr
/* Initilize MPID/MPIDR registers */
mrs \xreg1, midr_el1
mrs \xreg2, mpidr_el1
msr vpidr_el2, \xreg1
msr vmpidr_el2, \xreg2
/* Disable coprocessor traps */
mov \xreg1, #0x33ff
msr cptr_el2, \xreg1 /* Disable coprocessor traps to EL2 */
msr hstr_el2, xzr /* Disable coprocessor traps to EL2 */
mov \xreg1, #3 << 20
msr cpacr_el1, \xreg1 /* Enable FP/SIMD at EL1 */
/* Initialize HCR_EL2 */
mov \xreg1, #(1 << 31) /* 64bit EL1 */
orr \xreg1, \xreg1, #(1 << 29) /* Disable HVC */
msr hcr_el2, \xreg1
/* SCTLR_EL1 initialization
*
* setting RES1 bits (29,28,23,22,20,11) to 1
* and RES0 bits (31,30,27,21,17,13,10,6) +
* UCI,EE,EOE,WXN,nTWE,nTWI,UCT,DZE,I,UMA,SED,ITD,
* CP15BEN,SA0,SA,C,A,M to 0
*/
mov \xreg1, #0x0800
movk \xreg1, #0x30d0, lsl #16
msr sctlr_el1, \xreg1
/* Return to the EL1_SP1 mode from EL2 */
mov \xreg1, sp
msr sp_el1, \xreg1 /* Migrate SP */
mrs \xreg1, vbar_el2
msr vbar_el1, \xreg1 /* Migrate VBAR */
mov \xreg1, #0x3c5
msr spsr_el2, \xreg1 /* EL1_SP1 | D | A | I | F */
msr elr_el2, lr
eret
.endm
#if defined(CONFIG_GICV3)
.macro gic_wait_for_interrupt_m xreg1
0 : wfi
mrs \xreg1, ICC_IAR1_EL1
msr ICC_EOIR1_EL1, \xreg1
cbnz \xreg1, 0b
.endm
#elif defined(CONFIG_GICV2)
.macro gic_wait_for_interrupt_m xreg1, wreg2
0 : wfi
ldr \wreg2, [\xreg1, GICC_AIAR]
str \wreg2, [\xreg1, GICC_AEOIR]
and \wreg2, \wreg2, #0x3ff
cbnz \wreg2, 0b
.endm
#endif
#endif /* CONFIG_ARM64 */
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARM_MACRO_H__ */
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