| /* 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 |
| 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__ */ |
