/* * Based on arch/arm/include/asm/mmu_context.h * * Copyright (C) 1996 Russell King. * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASM_MMU_CONTEXT_H #define __ASM_MMU_CONTEXT_H #ifndef __ASSEMBLY__ #include <linux/compiler.h> #include <linux/sched.h> #include <linux/sched/hotplug.h> #include <linux/mm_types.h> #include <asm/cacheflush.h> #include <asm/cpufeature.h> #include <asm/proc-fns.h> #include <asm-generic/mm_hooks.h> #include <asm/cputype.h> #include <asm/pgtable.h> #include <asm/sysreg.h> #include <asm/tlbflush.h> static inline void contextidr_thread_switch(struct task_struct *next) { if (!IS_ENABLED(CONFIG_PID_IN_CONTEXTIDR)) return; write_sysreg(task_pid_nr(next), contextidr_el1); isb(); } /* * Set TTBR0 to empty_zero_page. No translations will be possible via TTBR0. */ static inline void cpu_set_reserved_ttbr0(void) { unsigned long ttbr = __pa_symbol(empty_zero_page); write_sysreg(ttbr, ttbr0_el1); isb(); } static inline void cpu_switch_mm(pgd_t *pgd, struct mm_struct *mm) { BUG_ON(pgd == swapper_pg_dir); cpu_set_reserved_ttbr0(); cpu_do_switch_mm(virt_to_phys(pgd),mm); } /* * TCR.T0SZ value to use when the ID map is active. Usually equals * TCR_T0SZ(VA_BITS), unless system RAM is positioned very high in * physical memory, in which case it will be smaller. */ extern u64 idmap_t0sz; static inline bool __cpu_uses_extended_idmap(void) { return (!IS_ENABLED(CONFIG_ARM64_VA_BITS_48) && unlikely(idmap_t0sz != TCR_T0SZ(VA_BITS))); } /* * Set TCR.T0SZ to its default value (based on VA_BITS) */ static inline void __cpu_set_tcr_t0sz(unsigned long t0sz) { unsigned long tcr; if (!__cpu_uses_extended_idmap()) return; tcr = read_sysreg(tcr_el1); tcr &= ~TCR_T0SZ_MASK; tcr |= t0sz << TCR_T0SZ_OFFSET; write_sysreg(tcr, tcr_el1); isb(); } #define cpu_set_default_tcr_t0sz() __cpu_set_tcr_t0sz(TCR_T0SZ(VA_BITS)) #define cpu_set_idmap_tcr_t0sz() __cpu_set_tcr_t0sz(idmap_t0sz) /* * Remove the idmap from TTBR0_EL1 and install the pgd of the active mm. * * The idmap lives in the same VA range as userspace, but uses global entries * and may use a different TCR_EL1.T0SZ. To avoid issues resulting from * speculative TLB fetches, we must temporarily install the reserved page * tables while we invalidate the TLBs and set up the correct TCR_EL1.T0SZ. * * If current is a not a user task, the mm covers the TTBR1_EL1 page tables, * which should not be installed in TTBR0_EL1. In this case we can leave the * reserved page tables in place. */ static inline void cpu_uninstall_idmap(void) { struct mm_struct *mm = current->active_mm; cpu_set_reserved_ttbr0(); local_flush_tlb_all(); cpu_set_default_tcr_t0sz(); if (mm != &init_mm && !system_uses_ttbr0_pan()) cpu_switch_mm(mm->pgd, mm); } static inline void cpu_install_idmap(void) { cpu_set_reserved_ttbr0(); local_flush_tlb_all(); cpu_set_idmap_tcr_t0sz(); cpu_switch_mm(lm_alias(idmap_pg_dir), &init_mm); } /* * Atomically replaces the active TTBR1_EL1 PGD with a new VA-compatible PGD, * avoiding the possibility of conflicting TLB entries being allocated. */ static inline void cpu_replace_ttbr1(pgd_t *pgd) { typedef void (ttbr_replace_func)(phys_addr_t); extern ttbr_replace_func idmap_cpu_replace_ttbr1; ttbr_replace_func *replace_phys; phys_addr_t pgd_phys = virt_to_phys(pgd); replace_phys = (void *)__pa_symbol(idmap_cpu_replace_ttbr1); cpu_install_idmap(); replace_phys(pgd_phys); cpu_uninstall_idmap(); } /* * It would be nice to return ASIDs back to the allocator, but unfortunately * that introduces a race with a generation rollover where we could erroneously * free an ASID allocated in a future generation. We could workaround this by * freeing the ASID from the context of the dying mm (e.g. in arch_exit_mmap), * but we'd then need to make sure that we didn't dirty any TLBs afterwards. * Setting a reserved TTBR0 or EPD0 would work, but it all gets ugly when you * take CPU migration into account. */ #define destroy_context(mm) do { } while(0) void check_and_switch_context(struct mm_struct *mm, unsigned int cpu); #define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.id, 0); 0; }) #ifdef CONFIG_ARM64_SW_TTBR0_PAN static inline void update_saved_ttbr0(struct task_struct *tsk, struct mm_struct *mm) { u64 ttbr; if (!system_uses_ttbr0_pan()) return; if (mm == &init_mm) ttbr = __pa_symbol(empty_zero_page); else ttbr = virt_to_phys(mm->pgd) | ASID(mm) << 48; WRITE_ONCE(task_thread_info(tsk)->ttbr0, ttbr); } #else static inline void update_saved_ttbr0(struct task_struct *tsk, struct mm_struct *mm) { } #endif static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) { /* * We don't actually care about the ttbr0 mapping, so point it at the * zero page. */ update_saved_ttbr0(tsk, &init_mm); } static inline void __switch_mm(struct mm_struct *next) { unsigned int cpu = smp_processor_id(); /* * init_mm.pgd does not contain any user mappings and it is always * active for kernel addresses in TTBR1. Just set the reserved TTBR0. */ if (next == &init_mm) { cpu_set_reserved_ttbr0(); return; } check_and_switch_context(next, cpu); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { if (prev != next) __switch_mm(next); /* * Update the saved TTBR0_EL1 of the scheduled-in task as the previous * value may have not been initialised yet (activate_mm caller) or the * ASID has changed since the last run (following the context switch * of another thread of the same process). */ update_saved_ttbr0(tsk, next); } #define deactivate_mm(tsk,mm) do { } while (0) #define activate_mm(prev,next) switch_mm(prev, next, current) void verify_cpu_asid_bits(void); void post_ttbr_update_workaround(void); #endif /* !__ASSEMBLY__ */ #endif /* !__ASM_MMU_CONTEXT_H */
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
xen | Folder | 0755 |
|
|
Kbuild | File | 703 B | 0644 |
|
acenv.h | File | 541 B | 0644 |
|
acpi.h | File | 4.34 KB | 0644 |
|
alternative.h | File | 7.63 KB | 0644 |
|
arch_gicv3.h | File | 3.44 KB | 0644 |
|
arch_timer.h | File | 4.87 KB | 0644 |
|
arm-cci.h | File | 794 B | 0644 |
|
asm-bug.h | File | 1.45 KB | 0644 |
|
asm-offsets.h | File | 35 B | 0644 |
|
asm-uaccess.h | File | 2.09 KB | 0644 |
|
assembler.h | File | 13.51 KB | 0644 |
|
atomic.h | File | 8.35 KB | 0644 |
|
atomic_ll_sc.h | File | 10.62 KB | 0644 |
|
atomic_lse.h | File | 14.82 KB | 0644 |
|
barrier.h | File | 3.78 KB | 0644 |
|
bitops.h | File | 1.9 KB | 0644 |
|
bitrev.h | File | 452 B | 0644 |
|
boot.h | File | 384 B | 0644 |
|
brk-imm.h | File | 706 B | 0644 |
|
bug.h | File | 1.09 KB | 0644 |
|
cache.h | File | 2.23 KB | 0644 |
|
cacheflush.h | File | 4.87 KB | 0644 |
|
checksum.h | File | 1.35 KB | 0644 |
|
clocksource.h | File | 192 B | 0644 |
|
cmpxchg.h | File | 7.98 KB | 0644 |
|
compat.h | File | 7.15 KB | 0644 |
|
compiler.h | File | 1.18 KB | 0644 |
|
cpu.h | File | 1.84 KB | 0644 |
|
cpu_ops.h | File | 2.73 KB | 0644 |
|
cpucaps.h | File | 1.83 KB | 0644 |
|
cpufeature.h | File | 19.14 KB | 0644 |
|
cpuidle.h | File | 401 B | 0644 |
|
cputype.h | File | 8.1 KB | 0644 |
|
current.h | File | 517 B | 0644 |
|
daifflags.h | File | 1.59 KB | 0644 |
|
dcc.h | File | 1.36 KB | 0644 |
|
debug-monitors.h | File | 3.76 KB | 0644 |
|
device.h | File | 886 B | 0644 |
|
dma-mapping.h | File | 2.42 KB | 0644 |
|
dmi.h | File | 850 B | 0644 |
|
efi.h | File | 4.57 KB | 0644 |
|
elf.h | File | 5.7 KB | 0644 |
|
esr.h | File | 9.02 KB | 0644 |
|
exception.h | File | 1.21 KB | 0644 |
|
exec.h | File | 868 B | 0644 |
|
extable.h | File | 815 B | 0644 |
|
fb.h | File | 1000 B | 0644 |
|
fixmap.h | File | 2.91 KB | 0644 |
|
fpsimd.h | File | 4.21 KB | 0644 |
|
fpsimdmacros.h | File | 5.62 KB | 0644 |
|
ftrace.h | File | 1.92 KB | 0644 |
|
futex.h | File | 3.41 KB | 0644 |
|
hardirq.h | File | 2.08 KB | 0644 |
|
hugetlb.h | File | 2.71 KB | 0644 |
|
hw_breakpoint.h | File | 4.46 KB | 0644 |
|
hwcap.h | File | 1.86 KB | 0644 |
|
hypervisor.h | File | 144 B | 0644 |
|
insn.h | File | 16.03 KB | 0644 |
|
io.h | File | 7.72 KB | 0644 |
|
irq.h | File | 307 B | 0644 |
|
irq_work.h | File | 228 B | 0644 |
|
irqflags.h | File | 2.3 KB | 0644 |
|
jump_label.h | File | 1.68 KB | 0644 |
|
kasan.h | File | 1.16 KB | 0644 |
|
kernel-pgtable.h | File | 4.03 KB | 0644 |
|
kexec.h | File | 2.42 KB | 0644 |
|
kgdb.h | File | 3.79 KB | 0644 |
|
kprobes.h | File | 1.74 KB | 0644 |
|
kvm_arm.h | File | 8.38 KB | 0644 |
|
kvm_asm.h | File | 4.26 KB | 0644 |
|
kvm_coproc.h | File | 2.04 KB | 0644 |
|
kvm_emulate.h | File | 10.38 KB | 0644 |
|
kvm_host.h | File | 15.73 KB | 0644 |
|
kvm_hyp.h | File | 5.79 KB | 0644 |
|
kvm_mmio.h | File | 1.3 KB | 0644 |
|
kvm_mmu.h | File | 11.72 KB | 0644 |
|
linkage.h | File | 114 B | 0644 |
|
lse.h | File | 1.26 KB | 0644 |
|
memblock.h | File | 720 B | 0644 |
|
memory.h | File | 9.32 KB | 0644 |
|
mmu.h | File | 2.74 KB | 0644 |
|
mmu_context.h | File | 6.35 KB | 0644 |
|
mmzone.h | File | 266 B | 0644 |
|
module.h | File | 2.8 KB | 0644 |
|
neon.h | File | 815 B | 0644 |
|
numa.h | File | 1.33 KB | 0644 |
|
page-def.h | File | 1.17 KB | 0644 |
|
page.h | File | 1.61 KB | 0644 |
|
paravirt.h | File | 458 B | 0644 |
|
pci.h | File | 878 B | 0644 |
|
percpu.h | File | 7.48 KB | 0644 |
|
perf_event.h | File | 3.17 KB | 0644 |
|
pgalloc.h | File | 3.71 KB | 0644 |
|
pgtable-hwdef.h | File | 9.4 KB | 0644 |
|
pgtable-prot.h | File | 4.38 KB | 0644 |
|
pgtable-types.h | File | 1.84 KB | 0644 |
|
pgtable.h | File | 21.55 KB | 0644 |
|
probes.h | File | 1022 B | 0644 |
|
proc-fns.h | File | 1.21 KB | 0644 |
|
processor.h | File | 6.52 KB | 0644 |
|
ptdump.h | File | 1.42 KB | 0644 |
|
ptrace.h | File | 9 KB | 0644 |
|
sdei.h | File | 1.46 KB | 0644 |
|
seccomp.h | File | 714 B | 0644 |
|
sections.h | File | 1.46 KB | 0644 |
|
shmparam.h | File | 965 B | 0644 |
|
signal32.h | File | 1.45 KB | 0644 |
|
simd.h | File | 1.39 KB | 0644 |
|
smp.h | File | 4.23 KB | 0644 |
|
smp_plat.h | File | 1.43 KB | 0644 |
|
sparsemem.h | File | 771 B | 0644 |
|
spinlock.h | File | 3.33 KB | 0644 |
|
spinlock_types.h | File | 1.06 KB | 0644 |
|
stack_pointer.h | File | 247 B | 0644 |
|
stackprotector.h | File | 1.11 KB | 0644 |
|
stacktrace.h | File | 2.53 KB | 0644 |
|
stage2_pgtable-nopmd.h | File | 1.3 KB | 0644 |
|
stage2_pgtable-nopud.h | File | 1.24 KB | 0644 |
|
stage2_pgtable.h | File | 4.89 KB | 0644 |
|
stat.h | File | 1.43 KB | 0644 |
|
string.h | File | 2.33 KB | 0644 |
|
suspend.h | File | 1.65 KB | 0644 |
|
sync_bitops.h | File | 1.11 KB | 0644 |
|
syscall.h | File | 2.87 KB | 0644 |
|
sysreg.h | File | 25.1 KB | 0644 |
|
system_misc.h | File | 1.86 KB | 0644 |
|
thread_info.h | File | 3.93 KB | 0644 |
|
timex.h | File | 883 B | 0644 |
|
tlb.h | File | 2.22 KB | 0644 |
|
tlbflush.h | File | 5.38 KB | 0644 |
|
topology.h | File | 1.29 KB | 0644 |
|
traps.h | File | 3.33 KB | 0644 |
|
uaccess.h | File | 12.01 KB | 0644 |
|
unistd.h | File | 1.6 KB | 0644 |
|
unistd32.h | File | 27.53 KB | 0644 |
|
uprobes.h | File | 777 B | 0644 |
|
vdso.h | File | 1.09 KB | 0644 |
|
vdso_datapage.h | File | 1.53 KB | 0644 |
|
vectors.h | File | 1.75 KB | 0644 |
|
virt.h | File | 3 KB | 0644 |
|
vmap_stack.h | File | 769 B | 0644 |
|
word-at-a-time.h | File | 2.22 KB | 0644 |
|