forked from Minki/linux
38fd94b027
The Qualcomm Datacenter Technologies Falkor v1 CPU may allocate TLB entries using an incorrect ASID when TTBRx_EL1 is being updated. When the erratum is triggered, page table entries using the new translation table base address (BADDR) will be allocated into the TLB using the old ASID. All circumstances leading to the incorrect ASID being cached in the TLB arise when software writes TTBRx_EL1[ASID] and TTBRx_EL1[BADDR], a memory operation is in the process of performing a translation using the specific TTBRx_EL1 being written, and the memory operation uses a translation table descriptor designated as non-global. EL2 and EL3 code changing the EL1&0 ASID is not subject to this erratum because hardware is prohibited from performing translations from an out-of-context translation regime. Consider the following pseudo code. write new BADDR and ASID values to TTBRx_EL1 Replacing the above sequence with the one below will ensure that no TLB entries with an incorrect ASID are used by software. write reserved value to TTBRx_EL1[ASID] ISB write new value to TTBRx_EL1[BADDR] ISB write new value to TTBRx_EL1[ASID] ISB When the above sequence is used, page table entries using the new BADDR value may still be incorrectly allocated into the TLB using the reserved ASID. Yet this will not reduce functionality, since TLB entries incorrectly tagged with the reserved ASID will never be hit by a later instruction. Based on work by Shanker Donthineni <shankerd@codeaurora.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Christopher Covington <cov@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
462 lines
10 KiB
C
462 lines
10 KiB
C
/*
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* Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
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*
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* Copyright (C) 1996-2000 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASSEMBLY__
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#error "Only include this from assembly code"
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#endif
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#ifndef __ASM_ASSEMBLER_H
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#define __ASM_ASSEMBLER_H
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#include <asm/asm-offsets.h>
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#include <asm/cpufeature.h>
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#include <asm/mmu_context.h>
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#include <asm/page.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/ptrace.h>
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#include <asm/thread_info.h>
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/*
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* Enable and disable interrupts.
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*/
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.macro disable_irq
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msr daifset, #2
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.endm
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.macro enable_irq
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msr daifclr, #2
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.endm
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.macro save_and_disable_irq, flags
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mrs \flags, daif
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msr daifset, #2
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.endm
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.macro restore_irq, flags
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msr daif, \flags
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.endm
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/*
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* Enable and disable debug exceptions.
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*/
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.macro disable_dbg
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msr daifset, #8
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.endm
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.macro enable_dbg
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msr daifclr, #8
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.endm
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.macro disable_step_tsk, flgs, tmp
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tbz \flgs, #TIF_SINGLESTEP, 9990f
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mrs \tmp, mdscr_el1
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bic \tmp, \tmp, #1
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msr mdscr_el1, \tmp
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isb // Synchronise with enable_dbg
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9990:
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.endm
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.macro enable_step_tsk, flgs, tmp
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tbz \flgs, #TIF_SINGLESTEP, 9990f
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disable_dbg
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mrs \tmp, mdscr_el1
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orr \tmp, \tmp, #1
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msr mdscr_el1, \tmp
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9990:
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.endm
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/*
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* Enable both debug exceptions and interrupts. This is likely to be
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* faster than two daifclr operations, since writes to this register
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* are self-synchronising.
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*/
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.macro enable_dbg_and_irq
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msr daifclr, #(8 | 2)
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.endm
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/*
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* SMP data memory barrier
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*/
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.macro smp_dmb, opt
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dmb \opt
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.endm
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/*
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* NOP sequence
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*/
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.macro nops, num
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.rept \num
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nop
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.endr
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.endm
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/*
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* Emit an entry into the exception table
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*/
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.macro _asm_extable, from, to
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.pushsection __ex_table, "a"
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.align 3
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.long (\from - .), (\to - .)
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.popsection
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.endm
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#define USER(l, x...) \
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9999: x; \
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_asm_extable 9999b, l
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/*
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* Register aliases.
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*/
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lr .req x30 // link register
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/*
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* Vector entry
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*/
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.macro ventry label
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.align 7
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b \label
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.endm
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/*
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* Select code when configured for BE.
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*/
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define CPU_BE(code...) code
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#else
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#define CPU_BE(code...)
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#endif
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/*
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* Select code when configured for LE.
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*/
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define CPU_LE(code...)
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#else
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#define CPU_LE(code...) code
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#endif
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/*
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* Define a macro that constructs a 64-bit value by concatenating two
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* 32-bit registers. Note that on big endian systems the order of the
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* registers is swapped.
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*/
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#ifndef CONFIG_CPU_BIG_ENDIAN
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.macro regs_to_64, rd, lbits, hbits
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#else
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.macro regs_to_64, rd, hbits, lbits
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#endif
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orr \rd, \lbits, \hbits, lsl #32
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.endm
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/*
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* Pseudo-ops for PC-relative adr/ldr/str <reg>, <symbol> where
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* <symbol> is within the range +/- 4 GB of the PC.
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*/
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/*
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* @dst: destination register (64 bit wide)
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* @sym: name of the symbol
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* @tmp: optional scratch register to be used if <dst> == sp, which
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* is not allowed in an adrp instruction
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*/
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.macro adr_l, dst, sym, tmp=
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.ifb \tmp
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adrp \dst, \sym
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add \dst, \dst, :lo12:\sym
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.else
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adrp \tmp, \sym
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add \dst, \tmp, :lo12:\sym
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.endif
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.endm
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/*
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* @dst: destination register (32 or 64 bit wide)
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* @sym: name of the symbol
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* @tmp: optional 64-bit scratch register to be used if <dst> is a
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* 32-bit wide register, in which case it cannot be used to hold
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* the address
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*/
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.macro ldr_l, dst, sym, tmp=
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.ifb \tmp
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adrp \dst, \sym
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ldr \dst, [\dst, :lo12:\sym]
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.else
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adrp \tmp, \sym
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ldr \dst, [\tmp, :lo12:\sym]
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.endif
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.endm
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/*
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* @src: source register (32 or 64 bit wide)
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* @sym: name of the symbol
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* @tmp: mandatory 64-bit scratch register to calculate the address
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* while <src> needs to be preserved.
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*/
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.macro str_l, src, sym, tmp
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adrp \tmp, \sym
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str \src, [\tmp, :lo12:\sym]
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.endm
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/*
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* @dst: Result of per_cpu(sym, smp_processor_id())
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* @sym: The name of the per-cpu variable
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* @tmp: scratch register
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*/
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.macro adr_this_cpu, dst, sym, tmp
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adr_l \dst, \sym
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mrs \tmp, tpidr_el1
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add \dst, \dst, \tmp
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.endm
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/*
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* @dst: Result of READ_ONCE(per_cpu(sym, smp_processor_id()))
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* @sym: The name of the per-cpu variable
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* @tmp: scratch register
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*/
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.macro ldr_this_cpu dst, sym, tmp
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adr_l \dst, \sym
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mrs \tmp, tpidr_el1
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ldr \dst, [\dst, \tmp]
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.endm
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/*
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* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
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*/
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.macro vma_vm_mm, rd, rn
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ldr \rd, [\rn, #VMA_VM_MM]
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.endm
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/*
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* mmid - get context id from mm pointer (mm->context.id)
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*/
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.macro mmid, rd, rn
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ldr \rd, [\rn, #MM_CONTEXT_ID]
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.endm
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/*
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* read_ctr - read CTR_EL0. If the system has mismatched
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* cache line sizes, provide the system wide safe value
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* from arm64_ftr_reg_ctrel0.sys_val
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*/
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.macro read_ctr, reg
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alternative_if_not ARM64_MISMATCHED_CACHE_LINE_SIZE
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mrs \reg, ctr_el0 // read CTR
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nop
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alternative_else
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ldr_l \reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
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alternative_endif
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.endm
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/*
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* raw_dcache_line_size - get the minimum D-cache line size on this CPU
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* from the CTR register.
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*/
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.macro raw_dcache_line_size, reg, tmp
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mrs \tmp, ctr_el0 // read CTR
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ubfm \tmp, \tmp, #16, #19 // cache line size encoding
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mov \reg, #4 // bytes per word
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lsl \reg, \reg, \tmp // actual cache line size
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.endm
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/*
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* dcache_line_size - get the safe D-cache line size across all CPUs
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*/
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.macro dcache_line_size, reg, tmp
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read_ctr \tmp
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ubfm \tmp, \tmp, #16, #19 // cache line size encoding
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mov \reg, #4 // bytes per word
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lsl \reg, \reg, \tmp // actual cache line size
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.endm
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/*
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* raw_icache_line_size - get the minimum I-cache line size on this CPU
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* from the CTR register.
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*/
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.macro raw_icache_line_size, reg, tmp
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mrs \tmp, ctr_el0 // read CTR
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and \tmp, \tmp, #0xf // cache line size encoding
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mov \reg, #4 // bytes per word
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lsl \reg, \reg, \tmp // actual cache line size
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.endm
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/*
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* icache_line_size - get the safe I-cache line size across all CPUs
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*/
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.macro icache_line_size, reg, tmp
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read_ctr \tmp
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and \tmp, \tmp, #0xf // cache line size encoding
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mov \reg, #4 // bytes per word
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lsl \reg, \reg, \tmp // actual cache line size
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.endm
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/*
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* tcr_set_idmap_t0sz - update TCR.T0SZ so that we can load the ID map
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*/
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.macro tcr_set_idmap_t0sz, valreg, tmpreg
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#ifndef CONFIG_ARM64_VA_BITS_48
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ldr_l \tmpreg, idmap_t0sz
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bfi \valreg, \tmpreg, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
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#endif
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.endm
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/*
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* Macro to perform a data cache maintenance for the interval
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* [kaddr, kaddr + size)
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*
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* op: operation passed to dc instruction
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* domain: domain used in dsb instruciton
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* kaddr: starting virtual address of the region
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* size: size of the region
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* Corrupts: kaddr, size, tmp1, tmp2
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*/
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.macro dcache_by_line_op op, domain, kaddr, size, tmp1, tmp2
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dcache_line_size \tmp1, \tmp2
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add \size, \kaddr, \size
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sub \tmp2, \tmp1, #1
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bic \kaddr, \kaddr, \tmp2
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9998:
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.if (\op == cvau || \op == cvac)
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alternative_if_not ARM64_WORKAROUND_CLEAN_CACHE
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dc \op, \kaddr
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alternative_else
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dc civac, \kaddr
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alternative_endif
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.else
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dc \op, \kaddr
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.endif
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add \kaddr, \kaddr, \tmp1
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cmp \kaddr, \size
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b.lo 9998b
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dsb \domain
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.endm
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/*
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* reset_pmuserenr_el0 - reset PMUSERENR_EL0 if PMUv3 present
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*/
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.macro reset_pmuserenr_el0, tmpreg
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mrs \tmpreg, id_aa64dfr0_el1 // Check ID_AA64DFR0_EL1 PMUVer
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sbfx \tmpreg, \tmpreg, #8, #4
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cmp \tmpreg, #1 // Skip if no PMU present
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b.lt 9000f
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msr pmuserenr_el0, xzr // Disable PMU access from EL0
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9000:
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.endm
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/*
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* copy_page - copy src to dest using temp registers t1-t8
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*/
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.macro copy_page dest:req src:req t1:req t2:req t3:req t4:req t5:req t6:req t7:req t8:req
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9998: ldp \t1, \t2, [\src]
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ldp \t3, \t4, [\src, #16]
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ldp \t5, \t6, [\src, #32]
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ldp \t7, \t8, [\src, #48]
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add \src, \src, #64
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stnp \t1, \t2, [\dest]
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stnp \t3, \t4, [\dest, #16]
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stnp \t5, \t6, [\dest, #32]
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stnp \t7, \t8, [\dest, #48]
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add \dest, \dest, #64
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tst \src, #(PAGE_SIZE - 1)
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b.ne 9998b
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.endm
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/*
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* Annotate a function as position independent, i.e., safe to be called before
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* the kernel virtual mapping is activated.
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*/
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#define ENDPIPROC(x) \
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.globl __pi_##x; \
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.type __pi_##x, %function; \
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.set __pi_##x, x; \
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.size __pi_##x, . - x; \
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ENDPROC(x)
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/*
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* Emit a 64-bit absolute little endian symbol reference in a way that
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* ensures that it will be resolved at build time, even when building a
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* PIE binary. This requires cooperation from the linker script, which
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* must emit the lo32/hi32 halves individually.
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*/
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.macro le64sym, sym
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.long \sym\()_lo32
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.long \sym\()_hi32
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.endm
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/*
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* mov_q - move an immediate constant into a 64-bit register using
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* between 2 and 4 movz/movk instructions (depending on the
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* magnitude and sign of the operand)
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*/
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.macro mov_q, reg, val
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.if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff)
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movz \reg, :abs_g1_s:\val
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.else
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.if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff)
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movz \reg, :abs_g2_s:\val
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.else
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movz \reg, :abs_g3:\val
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movk \reg, :abs_g2_nc:\val
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.endif
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movk \reg, :abs_g1_nc:\val
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.endif
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movk \reg, :abs_g0_nc:\val
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.endm
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/*
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* Return the current thread_info.
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*/
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.macro get_thread_info, rd
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mrs \rd, sp_el0
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.endm
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/*
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* Errata workaround prior to TTBR0_EL1 update
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*
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* val: TTBR value with new BADDR, preserved
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* tmp0: temporary register, clobbered
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* tmp1: other temporary register, clobbered
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*/
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.macro pre_ttbr0_update_workaround, val, tmp0, tmp1
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#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
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alternative_if ARM64_WORKAROUND_QCOM_FALKOR_E1003
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mrs \tmp0, ttbr0_el1
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mov \tmp1, #FALKOR_RESERVED_ASID
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bfi \tmp0, \tmp1, #48, #16 // reserved ASID + old BADDR
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msr ttbr0_el1, \tmp0
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isb
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bfi \tmp0, \val, #0, #48 // reserved ASID + new BADDR
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msr ttbr0_el1, \tmp0
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isb
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alternative_else_nop_endif
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#endif
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.endm
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/*
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* Errata workaround post TTBR0_EL1 update.
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*/
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.macro post_ttbr0_update_workaround
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#ifdef CONFIG_CAVIUM_ERRATUM_27456
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alternative_if ARM64_WORKAROUND_CAVIUM_27456
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ic iallu
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dsb nsh
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isb
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alternative_else_nop_endif
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#endif
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.endm
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#endif /* __ASM_ASSEMBLER_H */
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