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f833e790b4
The original creation of arch/arm/cpu/armv7/{virt-v7.c,nonsec_virt.S}
predates the SPDX conversion, so the original elaborate license
statements sneaked in.
Fix this by replacing them with the proper abbreviation.
Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
193 lines
5.3 KiB
ArmAsm
193 lines
5.3 KiB
ArmAsm
/*
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* code for switching cores into non-secure state and into HYP mode
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*
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* Copyright (c) 2013 Andre Przywara <andre.przywara@linaro.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <config.h>
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#include <linux/linkage.h>
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#include <asm/gic.h>
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#include <asm/armv7.h>
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.arch_extension sec
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.arch_extension virt
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/* the vector table for secure state and HYP mode */
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_monitor_vectors:
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.word 0 /* reset */
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.word 0 /* undef */
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adr pc, _secure_monitor
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.word 0
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.word 0
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adr pc, _hyp_trap
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.word 0
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.word 0
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/*
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* secure monitor handler
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* U-boot calls this "software interrupt" in start.S
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* This is executed on a "smc" instruction, we use a "smc #0" to switch
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* to non-secure state.
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* We use only r0 and r1 here, due to constraints in the caller.
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*/
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.align 5
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_secure_monitor:
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mrc p15, 0, r1, c1, c1, 0 @ read SCR
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bic r1, r1, #0x4e @ clear IRQ, FIQ, EA, nET bits
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orr r1, r1, #0x31 @ enable NS, AW, FW bits
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#ifdef CONFIG_ARMV7_VIRT
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mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1
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and r0, r0, #CPUID_ARM_VIRT_MASK @ mask virtualization bits
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cmp r0, #(1 << CPUID_ARM_VIRT_SHIFT)
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orreq r1, r1, #0x100 @ allow HVC instruction
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#endif
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mcr p15, 0, r1, c1, c1, 0 @ write SCR (with NS bit set)
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#ifdef CONFIG_ARMV7_VIRT
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mrceq p15, 0, r0, c12, c0, 1 @ get MVBAR value
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mcreq p15, 4, r0, c12, c0, 0 @ write HVBAR
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#endif
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movs pc, lr @ return to non-secure SVC
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_hyp_trap:
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mrs lr, elr_hyp @ for older asm: .byte 0x00, 0xe3, 0x0e, 0xe1
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mov pc, lr @ do no switch modes, but
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@ return to caller
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/*
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* Secondary CPUs start here and call the code for the core specific parts
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* of the non-secure and HYP mode transition. The GIC distributor specific
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* code has already been executed by a C function before.
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* Then they go back to wfi and wait to be woken up by the kernel again.
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*/
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ENTRY(_smp_pen)
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mrs r0, cpsr
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orr r0, r0, #0xc0
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msr cpsr, r0 @ disable interrupts
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ldr r1, =_start
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mcr p15, 0, r1, c12, c0, 0 @ set VBAR
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bl _nonsec_init
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mov r12, r0 @ save GICC address
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#ifdef CONFIG_ARMV7_VIRT
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bl _switch_to_hyp
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#endif
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ldr r1, [r12, #GICC_IAR] @ acknowledge IPI
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str r1, [r12, #GICC_EOIR] @ signal end of interrupt
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adr r0, _smp_pen @ do not use this address again
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b smp_waitloop @ wait for IPIs, board specific
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ENDPROC(_smp_pen)
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/*
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* Switch a core to non-secure state.
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*
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* 1. initialize the GIC per-core interface
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* 2. allow coprocessor access in non-secure modes
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* 3. switch the cpu mode (by calling "smc #0")
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*
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* Called from smp_pen by secondary cores and directly by the BSP.
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* Do not assume that the stack is available and only use registers
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* r0-r3 and r12.
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*
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* PERIPHBASE is used to get the GIC address. This could be 40 bits long,
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* though, but we check this in C before calling this function.
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*/
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ENTRY(_nonsec_init)
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#ifdef CONFIG_ARM_GIC_BASE_ADDRESS
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ldr r2, =CONFIG_ARM_GIC_BASE_ADDRESS
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#else
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mrc p15, 4, r2, c15, c0, 0 @ read CBAR
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bfc r2, #0, #15 @ clear reserved bits
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#endif
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add r3, r2, #GIC_DIST_OFFSET @ GIC dist i/f offset
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mvn r1, #0 @ all bits to 1
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str r1, [r3, #GICD_IGROUPRn] @ allow private interrupts
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mrc p15, 0, r0, c0, c0, 0 @ read MIDR
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ldr r1, =MIDR_PRIMARY_PART_MASK
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and r0, r0, r1 @ mask out variant and revision
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ldr r1, =MIDR_CORTEX_A7_R0P0 & MIDR_PRIMARY_PART_MASK
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cmp r0, r1 @ check for Cortex-A7
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ldr r1, =MIDR_CORTEX_A15_R0P0 & MIDR_PRIMARY_PART_MASK
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cmpne r0, r1 @ check for Cortex-A15
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movne r1, #GIC_CPU_OFFSET_A9 @ GIC CPU offset for A9
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moveq r1, #GIC_CPU_OFFSET_A15 @ GIC CPU offset for A15/A7
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add r3, r2, r1 @ r3 = GIC CPU i/f addr
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mov r1, #1 @ set GICC_CTLR[enable]
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str r1, [r3, #GICC_CTLR] @ and clear all other bits
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mov r1, #0xff
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str r1, [r3, #GICC_PMR] @ set priority mask register
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movw r1, #0x3fff
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movt r1, #0x0006
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mcr p15, 0, r1, c1, c1, 2 @ NSACR = all copros to non-sec
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/* The CNTFRQ register of the generic timer needs to be
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* programmed in secure state. Some primary bootloaders / firmware
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* omit this, so if the frequency is provided in the configuration,
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* we do this here instead.
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* But first check if we have the generic timer.
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*/
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#ifdef CONFIG_SYS_CLK_FREQ
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mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1
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and r0, r0, #CPUID_ARM_GENTIMER_MASK @ mask arch timer bits
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cmp r0, #(1 << CPUID_ARM_GENTIMER_SHIFT)
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ldreq r1, =CONFIG_SYS_CLK_FREQ
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mcreq p15, 0, r1, c14, c0, 0 @ write CNTFRQ
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#endif
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adr r1, _monitor_vectors
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mcr p15, 0, r1, c12, c0, 1 @ set MVBAR to secure vectors
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mrc p15, 0, ip, c12, c0, 0 @ save secure copy of VBAR
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isb
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smc #0 @ call into MONITOR mode
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mcr p15, 0, ip, c12, c0, 0 @ write non-secure copy of VBAR
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mov r1, #1
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str r1, [r3, #GICC_CTLR] @ enable non-secure CPU i/f
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add r2, r2, #GIC_DIST_OFFSET
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str r1, [r2, #GICD_CTLR] @ allow private interrupts
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mov r0, r3 @ return GICC address
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bx lr
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ENDPROC(_nonsec_init)
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#ifdef CONFIG_SMP_PEN_ADDR
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/* void __weak smp_waitloop(unsigned previous_address); */
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ENTRY(smp_waitloop)
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wfi
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ldr r1, =CONFIG_SMP_PEN_ADDR @ load start address
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ldr r1, [r1]
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cmp r0, r1 @ make sure we dont execute this code
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beq smp_waitloop @ again (due to a spurious wakeup)
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mov pc, r1
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ENDPROC(smp_waitloop)
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.weak smp_waitloop
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#endif
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ENTRY(_switch_to_hyp)
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mov r0, lr
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mov r1, sp @ save SVC copy of LR and SP
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isb
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hvc #0 @ for older asm: .byte 0x70, 0x00, 0x40, 0xe1
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mov sp, r1
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mov lr, r0 @ restore SVC copy of LR and SP
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bx lr
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ENDPROC(_switch_to_hyp)
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