466 lines
11 KiB
ArmAsm
466 lines
11 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/mm/proc.S
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*
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* Copyright (C) 2001 Deep Blue Solutions Ltd.
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* Copyright (C) 2012 ARM Ltd.
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* Author: Catalin Marinas <catalin.marinas@arm.com>
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/pgtable.h>
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#include <linux/cfi_types.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/asm_pointer_auth.h>
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#include <asm/hwcap.h>
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#include <asm/kernel-pgtable.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/cpufeature.h>
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#include <asm/alternative.h>
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#include <asm/smp.h>
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#include <asm/sysreg.h>
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#ifdef CONFIG_ARM64_64K_PAGES
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#define TCR_TG_FLAGS TCR_TG0_64K | TCR_TG1_64K
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#elif defined(CONFIG_ARM64_16K_PAGES)
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#define TCR_TG_FLAGS TCR_TG0_16K | TCR_TG1_16K
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#else /* CONFIG_ARM64_4K_PAGES */
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#define TCR_TG_FLAGS TCR_TG0_4K | TCR_TG1_4K
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#endif
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#ifdef CONFIG_RANDOMIZE_BASE
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#define TCR_KASLR_FLAGS TCR_NFD1
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#else
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#define TCR_KASLR_FLAGS 0
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#endif
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#define TCR_SMP_FLAGS TCR_SHARED
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/* PTWs cacheable, inner/outer WBWA */
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#define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA
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#ifdef CONFIG_KASAN_SW_TAGS
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#define TCR_KASAN_SW_FLAGS TCR_TBI1 | TCR_TBID1
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#else
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#define TCR_KASAN_SW_FLAGS 0
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#endif
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#ifdef CONFIG_KASAN_HW_TAGS
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#define TCR_MTE_FLAGS TCR_TCMA1 | TCR_TBI1 | TCR_TBID1
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#elif defined(CONFIG_ARM64_MTE)
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/*
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* The mte_zero_clear_page_tags() implementation uses DC GZVA, which relies on
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* TBI being enabled at EL1.
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*/
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#define TCR_MTE_FLAGS TCR_TBI1 | TCR_TBID1
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#else
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#define TCR_MTE_FLAGS 0
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#endif
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/*
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* Default MAIR_EL1. MT_NORMAL_TAGGED is initially mapped as Normal memory and
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* changed during mte_cpu_setup to Normal Tagged if the system supports MTE.
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*/
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#define MAIR_EL1_SET \
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(MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRnE, MT_DEVICE_nGnRnE) | \
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MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRE, MT_DEVICE_nGnRE) | \
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MAIR_ATTRIDX(MAIR_ATTR_NORMAL_NC, MT_NORMAL_NC) | \
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MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL) | \
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MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL_TAGGED))
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#ifdef CONFIG_CPU_PM
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/**
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* cpu_do_suspend - save CPU registers context
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*
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* x0: virtual address of context pointer
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*
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* This must be kept in sync with struct cpu_suspend_ctx in <asm/suspend.h>.
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*/
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SYM_FUNC_START(cpu_do_suspend)
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mrs x2, tpidr_el0
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mrs x3, tpidrro_el0
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mrs x4, contextidr_el1
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mrs x5, osdlr_el1
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mrs x6, cpacr_el1
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mrs x7, tcr_el1
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mrs x8, vbar_el1
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mrs x9, mdscr_el1
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mrs x10, oslsr_el1
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mrs x11, sctlr_el1
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get_this_cpu_offset x12
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mrs x13, sp_el0
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stp x2, x3, [x0]
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stp x4, x5, [x0, #16]
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stp x6, x7, [x0, #32]
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stp x8, x9, [x0, #48]
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stp x10, x11, [x0, #64]
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stp x12, x13, [x0, #80]
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/*
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* Save x18 as it may be used as a platform register, e.g. by shadow
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* call stack.
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*/
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str x18, [x0, #96]
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ret
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SYM_FUNC_END(cpu_do_suspend)
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/**
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* cpu_do_resume - restore CPU register context
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*
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* x0: Address of context pointer
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*/
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SYM_FUNC_START(cpu_do_resume)
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ldp x2, x3, [x0]
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ldp x4, x5, [x0, #16]
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ldp x6, x8, [x0, #32]
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ldp x9, x10, [x0, #48]
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ldp x11, x12, [x0, #64]
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ldp x13, x14, [x0, #80]
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/*
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* Restore x18, as it may be used as a platform register, and clear
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* the buffer to minimize the risk of exposure when used for shadow
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* call stack.
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*/
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ldr x18, [x0, #96]
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str xzr, [x0, #96]
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msr tpidr_el0, x2
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msr tpidrro_el0, x3
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msr contextidr_el1, x4
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msr cpacr_el1, x6
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/* Don't change t0sz here, mask those bits when restoring */
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mrs x7, tcr_el1
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bfi x8, x7, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
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msr tcr_el1, x8
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msr vbar_el1, x9
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/*
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* __cpu_setup() cleared MDSCR_EL1.MDE and friends, before unmasking
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* debug exceptions. By restoring MDSCR_EL1 here, we may take a debug
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* exception. Mask them until local_daif_restore() in cpu_suspend()
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* resets them.
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*/
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disable_daif
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msr mdscr_el1, x10
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msr sctlr_el1, x12
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set_this_cpu_offset x13
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msr sp_el0, x14
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/*
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* Restore oslsr_el1 by writing oslar_el1
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*/
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msr osdlr_el1, x5
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ubfx x11, x11, #1, #1
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msr oslar_el1, x11
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reset_pmuserenr_el0 x0 // Disable PMU access from EL0
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reset_amuserenr_el0 x0 // Disable AMU access from EL0
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alternative_if ARM64_HAS_RAS_EXTN
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msr_s SYS_DISR_EL1, xzr
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alternative_else_nop_endif
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ptrauth_keys_install_kernel_nosync x14, x1, x2, x3
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isb
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ret
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SYM_FUNC_END(cpu_do_resume)
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#endif
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.pushsection ".idmap.text", "a"
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.macro __idmap_cpu_set_reserved_ttbr1, tmp1, tmp2
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adrp \tmp1, reserved_pg_dir
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phys_to_ttbr \tmp2, \tmp1
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offset_ttbr1 \tmp2, \tmp1
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msr ttbr1_el1, \tmp2
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isb
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tlbi vmalle1
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dsb nsh
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isb
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.endm
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/*
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* void idmap_cpu_replace_ttbr1(phys_addr_t ttbr1)
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*
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* This is the low-level counterpart to cpu_replace_ttbr1, and should not be
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* called by anything else. It can only be executed from a TTBR0 mapping.
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*/
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SYM_TYPED_FUNC_START(idmap_cpu_replace_ttbr1)
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__idmap_cpu_set_reserved_ttbr1 x1, x3
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offset_ttbr1 x0, x3
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msr ttbr1_el1, x0
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isb
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ret
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SYM_FUNC_END(idmap_cpu_replace_ttbr1)
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.popsection
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#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
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#define KPTI_NG_PTE_FLAGS (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
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.pushsection ".idmap.text", "a"
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.macro kpti_mk_tbl_ng, type, num_entries
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add end_\type\()p, cur_\type\()p, #\num_entries * 8
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.Ldo_\type:
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ldr \type, [cur_\type\()p] // Load the entry
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tbz \type, #0, .Lnext_\type // Skip invalid and
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tbnz \type, #11, .Lnext_\type // non-global entries
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orr \type, \type, #PTE_NG // Same bit for blocks and pages
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str \type, [cur_\type\()p] // Update the entry
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.ifnc \type, pte
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tbnz \type, #1, .Lderef_\type
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.endif
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.Lnext_\type:
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add cur_\type\()p, cur_\type\()p, #8
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cmp cur_\type\()p, end_\type\()p
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b.ne .Ldo_\type
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.endm
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/*
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* Dereference the current table entry and map it into the temporary
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* fixmap slot associated with the current level.
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*/
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.macro kpti_map_pgtbl, type, level
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str xzr, [temp_pte, #8 * (\level + 1)] // break before make
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dsb nshst
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add pte, temp_pte, #PAGE_SIZE * (\level + 1)
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lsr pte, pte, #12
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tlbi vaae1, pte
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dsb nsh
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isb
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phys_to_pte pte, cur_\type\()p
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add cur_\type\()p, temp_pte, #PAGE_SIZE * (\level + 1)
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orr pte, pte, pte_flags
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str pte, [temp_pte, #8 * (\level + 1)]
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dsb nshst
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.endm
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/*
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* void __kpti_install_ng_mappings(int cpu, int num_secondaries, phys_addr_t temp_pgd,
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* unsigned long temp_pte_va)
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*
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* Called exactly once from stop_machine context by each CPU found during boot.
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*/
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.pushsection ".data", "aw", %progbits
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SYM_DATA(__idmap_kpti_flag, .long 1)
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.popsection
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SYM_TYPED_FUNC_START(idmap_kpti_install_ng_mappings)
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cpu .req w0
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temp_pte .req x0
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num_cpus .req w1
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pte_flags .req x1
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temp_pgd_phys .req x2
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swapper_ttb .req x3
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flag_ptr .req x4
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cur_pgdp .req x5
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end_pgdp .req x6
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pgd .req x7
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cur_pudp .req x8
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end_pudp .req x9
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cur_pmdp .req x11
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end_pmdp .req x12
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cur_ptep .req x14
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end_ptep .req x15
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pte .req x16
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valid .req x17
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mov x5, x3 // preserve temp_pte arg
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mrs swapper_ttb, ttbr1_el1
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adr_l flag_ptr, __idmap_kpti_flag
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cbnz cpu, __idmap_kpti_secondary
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/* We're the boot CPU. Wait for the others to catch up */
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sevl
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1: wfe
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ldaxr w17, [flag_ptr]
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eor w17, w17, num_cpus
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cbnz w17, 1b
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/* Switch to the temporary page tables on this CPU only */
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__idmap_cpu_set_reserved_ttbr1 x8, x9
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offset_ttbr1 temp_pgd_phys, x8
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msr ttbr1_el1, temp_pgd_phys
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isb
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mov temp_pte, x5
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mov pte_flags, #KPTI_NG_PTE_FLAGS
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/* Everybody is enjoying the idmap, so we can rewrite swapper. */
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/* PGD */
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adrp cur_pgdp, swapper_pg_dir
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kpti_map_pgtbl pgd, 0
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kpti_mk_tbl_ng pgd, PTRS_PER_PGD
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/* Ensure all the updated entries are visible to secondary CPUs */
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dsb ishst
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/* We're done: fire up swapper_pg_dir again */
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__idmap_cpu_set_reserved_ttbr1 x8, x9
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msr ttbr1_el1, swapper_ttb
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isb
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/* Set the flag to zero to indicate that we're all done */
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str wzr, [flag_ptr]
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ret
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.Lderef_pgd:
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/* PUD */
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.if CONFIG_PGTABLE_LEVELS > 3
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pud .req x10
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pte_to_phys cur_pudp, pgd
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kpti_map_pgtbl pud, 1
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kpti_mk_tbl_ng pud, PTRS_PER_PUD
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b .Lnext_pgd
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.else /* CONFIG_PGTABLE_LEVELS <= 3 */
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pud .req pgd
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.set .Lnext_pud, .Lnext_pgd
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.endif
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.Lderef_pud:
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/* PMD */
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.if CONFIG_PGTABLE_LEVELS > 2
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pmd .req x13
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pte_to_phys cur_pmdp, pud
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kpti_map_pgtbl pmd, 2
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kpti_mk_tbl_ng pmd, PTRS_PER_PMD
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b .Lnext_pud
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.else /* CONFIG_PGTABLE_LEVELS <= 2 */
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pmd .req pgd
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.set .Lnext_pmd, .Lnext_pgd
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.endif
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.Lderef_pmd:
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/* PTE */
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pte_to_phys cur_ptep, pmd
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kpti_map_pgtbl pte, 3
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kpti_mk_tbl_ng pte, PTRS_PER_PTE
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b .Lnext_pmd
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.unreq cpu
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.unreq temp_pte
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.unreq num_cpus
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.unreq pte_flags
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.unreq temp_pgd_phys
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.unreq cur_pgdp
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.unreq end_pgdp
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.unreq pgd
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.unreq cur_pudp
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.unreq end_pudp
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.unreq pud
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.unreq cur_pmdp
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.unreq end_pmdp
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.unreq pmd
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.unreq cur_ptep
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.unreq end_ptep
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.unreq pte
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.unreq valid
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/* Secondary CPUs end up here */
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__idmap_kpti_secondary:
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/* Uninstall swapper before surgery begins */
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__idmap_cpu_set_reserved_ttbr1 x16, x17
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/* Increment the flag to let the boot CPU we're ready */
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1: ldxr w16, [flag_ptr]
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add w16, w16, #1
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stxr w17, w16, [flag_ptr]
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cbnz w17, 1b
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/* Wait for the boot CPU to finish messing around with swapper */
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sevl
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1: wfe
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ldxr w16, [flag_ptr]
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cbnz w16, 1b
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/* All done, act like nothing happened */
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msr ttbr1_el1, swapper_ttb
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isb
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ret
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.unreq swapper_ttb
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.unreq flag_ptr
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SYM_FUNC_END(idmap_kpti_install_ng_mappings)
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.popsection
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#endif
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/*
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* __cpu_setup
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*
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* Initialise the processor for turning the MMU on.
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*
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* Input:
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* x0 - actual number of VA bits (ignored unless VA_BITS > 48)
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* Output:
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* Return in x0 the value of the SCTLR_EL1 register.
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*/
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.pushsection ".idmap.text", "a"
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SYM_FUNC_START(__cpu_setup)
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tlbi vmalle1 // Invalidate local TLB
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dsb nsh
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mov x1, #3 << 20
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msr cpacr_el1, x1 // Enable FP/ASIMD
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mov x1, #1 << 12 // Reset mdscr_el1 and disable
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msr mdscr_el1, x1 // access to the DCC from EL0
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isb // Unmask debug exceptions now,
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enable_dbg // since this is per-cpu
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reset_pmuserenr_el0 x1 // Disable PMU access from EL0
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reset_amuserenr_el0 x1 // Disable AMU access from EL0
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/*
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* Default values for VMSA control registers. These will be adjusted
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* below depending on detected CPU features.
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*/
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mair .req x17
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tcr .req x16
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mov_q mair, MAIR_EL1_SET
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mov_q tcr, TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \
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TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \
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TCR_TBI0 | TCR_A1 | TCR_KASAN_SW_FLAGS | TCR_MTE_FLAGS
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tcr_clear_errata_bits tcr, x9, x5
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#ifdef CONFIG_ARM64_VA_BITS_52
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sub x9, xzr, x0
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add x9, x9, #64
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tcr_set_t1sz tcr, x9
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#else
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idmap_get_t0sz x9
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#endif
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tcr_set_t0sz tcr, x9
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/*
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* Set the IPS bits in TCR_EL1.
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*/
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tcr_compute_pa_size tcr, #TCR_IPS_SHIFT, x5, x6
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#ifdef CONFIG_ARM64_HW_AFDBM
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/*
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* Enable hardware update of the Access Flags bit.
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* Hardware dirty bit management is enabled later,
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* via capabilities.
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*/
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mrs x9, ID_AA64MMFR1_EL1
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and x9, x9, #0xf
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cbz x9, 1f
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orr tcr, tcr, #TCR_HA // hardware Access flag update
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1:
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#endif /* CONFIG_ARM64_HW_AFDBM */
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msr mair_el1, mair
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msr tcr_el1, tcr
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/*
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* Prepare SCTLR
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*/
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mov_q x0, INIT_SCTLR_EL1_MMU_ON
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ret // return to head.S
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.unreq mair
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.unreq tcr
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SYM_FUNC_END(__cpu_setup)
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