338 lines
8.4 KiB
C
338 lines
8.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* include/asm-arm/macro.h
|
|
*
|
|
* Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
|
|
*/
|
|
|
|
#ifndef __ASM_ARM_MACRO_H__
|
|
#define __ASM_ARM_MACRO_H__
|
|
|
|
#ifdef CONFIG_ARM64
|
|
#include <asm/system.h>
|
|
#endif
|
|
|
|
#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 \xreg2, \xreg2, #32
|
|
lsl \xreg1, \xreg1, #40
|
|
lsr \xreg1, \xreg1, #40
|
|
orr \xreg1, \xreg1, \xreg2
|
|
cbz \xreg1, \master_label
|
|
#else
|
|
b \master_label
|
|
#endif
|
|
.endm
|
|
|
|
/*
|
|
* Switch from EL3 to EL2 for ARMv8
|
|
* @ep: kernel entry point
|
|
* @flag: The execution state flag for lower exception
|
|
* level, ES_TO_AARCH64 or ES_TO_AARCH32
|
|
* @tmp: temporary register
|
|
*
|
|
* For loading 32-bit OS, x1 is machine nr and x2 is ftaddr.
|
|
* For loading 64-bit OS, x0 is physical address to the FDT blob.
|
|
* They will be passed to the guest.
|
|
*/
|
|
.macro armv8_switch_to_el2_m, ep, flag, tmp
|
|
msr cptr_el3, xzr /* Disable coprocessor traps to EL3 */
|
|
mov \tmp, #CPTR_EL2_RES1
|
|
msr cptr_el2, \tmp /* Disable coprocessor traps to EL2 */
|
|
|
|
/* Initialize Generic Timers */
|
|
msr cntvoff_el2, xzr
|
|
|
|
/* 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
|
|
*/
|
|
ldr \tmp, =(SCTLR_EL2_RES1 | SCTLR_EL2_EE_LE |\
|
|
SCTLR_EL2_WXN_DIS | SCTLR_EL2_ICACHE_DIS |\
|
|
SCTLR_EL2_SA_DIS | SCTLR_EL2_DCACHE_DIS |\
|
|
SCTLR_EL2_ALIGN_DIS | SCTLR_EL2_MMU_DIS)
|
|
msr sctlr_el2, \tmp
|
|
|
|
mov \tmp, sp
|
|
msr sp_el2, \tmp /* Migrate SP */
|
|
mrs \tmp, vbar_el3
|
|
msr vbar_el2, \tmp /* Migrate VBAR */
|
|
|
|
/* Check switch to AArch64 EL2 or AArch32 Hypervisor mode */
|
|
cmp \flag, #ES_TO_AARCH32
|
|
b.eq 1f
|
|
|
|
/*
|
|
* The next lower exception level is AArch64, 64bit EL2 | HCE |
|
|
* RES1 (Bits[5:4]) | Non-secure EL0/EL1.
|
|
* and the SMD depends on requirements.
|
|
*/
|
|
#ifdef CONFIG_ARMV8_PSCI
|
|
ldr \tmp, =(SCR_EL3_RW_AARCH64 | SCR_EL3_HCE_EN |\
|
|
SCR_EL3_RES1 | SCR_EL3_NS_EN)
|
|
#else
|
|
ldr \tmp, =(SCR_EL3_RW_AARCH64 | SCR_EL3_HCE_EN |\
|
|
SCR_EL3_SMD_DIS | SCR_EL3_RES1 |\
|
|
SCR_EL3_NS_EN)
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARMV8_EA_EL3_FIRST
|
|
orr \tmp, \tmp, #SCR_EL3_EA_EN
|
|
#endif
|
|
msr scr_el3, \tmp
|
|
|
|
/* Return to the EL2_SP2 mode from EL3 */
|
|
ldr \tmp, =(SPSR_EL_DEBUG_MASK | SPSR_EL_SERR_MASK |\
|
|
SPSR_EL_IRQ_MASK | SPSR_EL_FIQ_MASK |\
|
|
SPSR_EL_M_AARCH64 | SPSR_EL_M_EL2H)
|
|
msr spsr_el3, \tmp
|
|
msr elr_el3, \ep
|
|
eret
|
|
|
|
1:
|
|
/*
|
|
* The next lower exception level is AArch32, 32bit EL2 | HCE |
|
|
* SMD | RES1 (Bits[5:4]) | Non-secure EL0/EL1.
|
|
*/
|
|
ldr \tmp, =(SCR_EL3_RW_AARCH32 | SCR_EL3_HCE_EN |\
|
|
SCR_EL3_SMD_DIS | SCR_EL3_RES1 |\
|
|
SCR_EL3_NS_EN)
|
|
msr scr_el3, \tmp
|
|
|
|
/* Return to AArch32 Hypervisor mode */
|
|
ldr \tmp, =(SPSR_EL_END_LE | SPSR_EL_ASYN_MASK |\
|
|
SPSR_EL_IRQ_MASK | SPSR_EL_FIQ_MASK |\
|
|
SPSR_EL_T_A32 | SPSR_EL_M_AARCH32 |\
|
|
SPSR_EL_M_HYP)
|
|
msr spsr_el3, \tmp
|
|
msr elr_el3, \ep
|
|
eret
|
|
.endm
|
|
|
|
/*
|
|
* Switch from EL2 to EL1 for ARMv8
|
|
* @ep: kernel entry point
|
|
* @flag: The execution state flag for lower exception
|
|
* level, ES_TO_AARCH64 or ES_TO_AARCH32
|
|
* @tmp: temporary register
|
|
*
|
|
* For loading 32-bit OS, x1 is machine nr and x2 is ftaddr.
|
|
* For loading 64-bit OS, x0 is physical address to the FDT blob.
|
|
* They will be passed to the guest.
|
|
*/
|
|
.macro armv8_switch_to_el1_m, ep, flag, tmp
|
|
/* Initialize Generic Timers */
|
|
mrs \tmp, cnthctl_el2
|
|
/* Enable EL1 access to timers */
|
|
orr \tmp, \tmp, #(CNTHCTL_EL2_EL1PCEN_EN |\
|
|
CNTHCTL_EL2_EL1PCTEN_EN)
|
|
msr cnthctl_el2, \tmp
|
|
msr cntvoff_el2, xzr
|
|
|
|
/* Initilize MPID/MPIDR registers */
|
|
mrs \tmp, midr_el1
|
|
msr vpidr_el2, \tmp
|
|
mrs \tmp, mpidr_el1
|
|
msr vmpidr_el2, \tmp
|
|
|
|
/* Disable coprocessor traps */
|
|
mov \tmp, #CPTR_EL2_RES1
|
|
msr cptr_el2, \tmp /* Disable coprocessor traps to EL2 */
|
|
msr hstr_el2, xzr /* Disable coprocessor traps to EL2 */
|
|
mov \tmp, #CPACR_EL1_FPEN_EN
|
|
msr cpacr_el1, \tmp /* Enable FP/SIMD at EL1 */
|
|
|
|
/* 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
|
|
*/
|
|
ldr \tmp, =(SCTLR_EL1_RES1 | SCTLR_EL1_UCI_DIS |\
|
|
SCTLR_EL1_EE_LE | SCTLR_EL1_WXN_DIS |\
|
|
SCTLR_EL1_NTWE_DIS | SCTLR_EL1_NTWI_DIS |\
|
|
SCTLR_EL1_UCT_DIS | SCTLR_EL1_DZE_DIS |\
|
|
SCTLR_EL1_ICACHE_DIS | SCTLR_EL1_UMA_DIS |\
|
|
SCTLR_EL1_SED_EN | SCTLR_EL1_ITD_EN |\
|
|
SCTLR_EL1_CP15BEN_DIS | SCTLR_EL1_SA0_DIS |\
|
|
SCTLR_EL1_SA_DIS | SCTLR_EL1_DCACHE_DIS |\
|
|
SCTLR_EL1_ALIGN_DIS | SCTLR_EL1_MMU_DIS)
|
|
msr sctlr_el1, \tmp
|
|
|
|
mov \tmp, sp
|
|
msr sp_el1, \tmp /* Migrate SP */
|
|
mrs \tmp, vbar_el2
|
|
msr vbar_el1, \tmp /* Migrate VBAR */
|
|
|
|
/* Check switch to AArch64 EL1 or AArch32 Supervisor mode */
|
|
cmp \flag, #ES_TO_AARCH32
|
|
b.eq 1f
|
|
|
|
/* Initialize HCR_EL2 */
|
|
ldr \tmp, =(HCR_EL2_RW_AARCH64 | HCR_EL2_HCD_DIS)
|
|
msr hcr_el2, \tmp
|
|
|
|
/* Return to the EL1_SP1 mode from EL2 */
|
|
ldr \tmp, =(SPSR_EL_DEBUG_MASK | SPSR_EL_SERR_MASK |\
|
|
SPSR_EL_IRQ_MASK | SPSR_EL_FIQ_MASK |\
|
|
SPSR_EL_M_AARCH64 | SPSR_EL_M_EL1H)
|
|
msr spsr_el2, \tmp
|
|
msr elr_el2, \ep
|
|
eret
|
|
|
|
1:
|
|
/* Initialize HCR_EL2 */
|
|
ldr \tmp, =(HCR_EL2_RW_AARCH32 | HCR_EL2_HCD_DIS)
|
|
msr hcr_el2, \tmp
|
|
|
|
/* Return to AArch32 Supervisor mode from EL2 */
|
|
ldr \tmp, =(SPSR_EL_END_LE | SPSR_EL_ASYN_MASK |\
|
|
SPSR_EL_IRQ_MASK | SPSR_EL_FIQ_MASK |\
|
|
SPSR_EL_T_A32 | SPSR_EL_M_AARCH32 |\
|
|
SPSR_EL_M_SVC)
|
|
msr spsr_el2, \tmp
|
|
msr elr_el2, \ep
|
|
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__ */
|