/* SPDX-License-Identifier: GPL-2.0+ */ /* * include/asm-arm/macro.h * * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD */ #ifndef __ASM_ARM_MACRO_H__ #define __ASM_ARM_MACRO_H__ #ifdef CONFIG_ARM64 #include #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 we are not in the highest exception level */ .macro branch_if_not_highest_el, xreg, label switch_el \xreg, 3f, 2f, 1f 2: mrs \xreg, ID_AA64PFR0_EL1 and \xreg, \xreg, #(ID_AA64PFR0_EL1_EL3) cbnz \xreg, \label b 3f 1: mrs \xreg, ID_AA64PFR0_EL1 and \xreg, \xreg, #(ID_AA64PFR0_EL1_EL3 | ID_AA64PFR0_EL1_EL2) cbnz \xreg, \label 3: .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__ */