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50e3ab6bcf
switching. The indirect costs being unnecessary TLB misses that are
incurred when ASIDs are not used. In fact, currently, when we perform a
context switch on one processor, we issue a broadcast TLB invalidation that
flushes the TLB contents on every processor.
Mark all user-space ("ttbr0") page table entries with the non-global flag so
that they are cached in the TLB under their ASID.
Correct an error in pmap_pinit0(). The pointer to the root of the page
table was being initialized to the root of the kernel-space page table
rather than a user-space page table. However, the root of the page table
that was being cached in process 0's md_l0addr field correctly pointed to a
user-space page table. As long as ASIDs weren't being used, this was
harmless, except that it led to some unnecessary page table switches in
pmap_switch(). Specifically, other kernel processes besides process 0 would
have their md_l0addr field set to the root of the kernel-space page table,
and so pmap_switch() would actually change page tables when switching
between process 0 and other kernel processes.
Implement a workaround for Cavium erratum 27456 affecting ThunderX machines.
(I would like to thank andrew@ for providing the code to detect the affected
machines.)
Address integer overflow in the definition of TCR_ASID_16.
Setup TCR according to the PARange and ASIDBits fields from
ID_AA64MMFR0_EL1. Previously, TCR_ASID_16 was unconditionally set.
Modify build_l1_block_pagetable so that lower attributes, such as ATTR_nG,
can be specified as a parameter.
Eliminate some unused code.
Earlier versions were tested to varying degrees by: andrew, emaste, markj
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D21922
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| .. | ||
| _align.h | ||
| _bus.h | ||
| _inttypes.h | ||
| _limits.h | ||
| _stdint.h | ||
| _types.h | ||
| acpica_machdep.h | ||
| armreg.h | ||
| asm.h | ||
| atomic.h | ||
| bus.h | ||
| bus_dma.h | ||
| bus_dma_impl.h | ||
| clock.h | ||
| counter.h | ||
| cpu.h | ||
| cpufunc.h | ||
| db_machdep.h | ||
| debug_monitor.h | ||
| disassem.h | ||
| dump.h | ||
| efi.h | ||
| elf.h | ||
| endian.h | ||
| exec.h | ||
| float.h | ||
| floatingpoint.h | ||
| fpu.h | ||
| frame.h | ||
| hypervisor.h | ||
| ieeefp.h | ||
| ifunc.h | ||
| in_cksum.h | ||
| intr.h | ||
| iodev.h | ||
| kdb.h | ||
| machdep.h | ||
| md_var.h | ||
| memdev.h | ||
| metadata.h | ||
| minidump.h | ||
| ofw_machdep.h | ||
| param.h | ||
| pcb.h | ||
| pci_cfgreg.h | ||
| pcpu.h | ||
| pcpu_aux.h | ||
| pmap.h | ||
| pmc_mdep.h | ||
| proc.h | ||
| procctl.h | ||
| profile.h | ||
| psl.h | ||
| pte.h | ||
| ptrace.h | ||
| reg.h | ||
| reloc.h | ||
| resource.h | ||
| runq.h | ||
| setjmp.h | ||
| sf_buf.h | ||
| sigframe.h | ||
| signal.h | ||
| smp.h | ||
| stack.h | ||
| stdarg.h | ||
| sysarch.h | ||
| trap.h | ||
| ucontext.h | ||
| undefined.h | ||
| vdso.h | ||
| vfp.h | ||
| vm.h | ||
| vmparam.h | ||