Define simple functions for alignment and boundary checks and use them everywhere instead of having slightly different implementations scattered about. Define them in vm_extern.h and use them where possible where vm_extern.h is included. Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D33685
Remove sys/mips as the next step of decomissioning mips from the tree. Remove mips special cases from the kernel make files. Remove the mips specific linker scripts. Sponsored by: Netflix
When a DMA request using bounce pages completes, a swi is triggered to schedule pending DMA requests using the just-freed bounce pages. For a long time this bus_dma swi has been tied to a "virtual memory" swi (swi_vm). However, all of the swi_vm implementations are the same and consist of checking a flag (busdma_swi_pending) which is always true and if set calling busdma_swi. I suspect this dates back to the pre-SMPng days and that the intention was for swi_vm to serve as a mux. However, in the current scheme there's no need for the mux. Instead, remove swi_vm and vm_ih. Each bus_dma implementation that uses bounce pages is responsible for creating its own swi (busdma_ih) which it now schedules directly. This swi invokes busdma_swi directly removing the need for busdma_swi_pending. One consequence is that the swi now works on RISC-V which had previously failed to invoke busdma_swi from swi_vm. Reviewed by: imp, kib Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D33447
This fixes building USB-using kernels after 0ec590d24e41.
Fixes: 0ec590d24e41 ("usb: add 32-bit compat for FIFOs")
MFC after: 2 weeks
The header exports the following: - Definition of struct tcb. - Helpers to get/set the tcb for the current thread. - TLS_TCB_SIZE (size of TCB) - TLS_TCB_ALIGN (alignment of TCB) - TLS_VARIANT_I or TLS_VARIANT_II - TLS_DTV_OFFSET (bias of pointers in dtv[]) - TLS_TP_OFFSET (bias of "thread pointer" relative to TCB) Note that TLS_TP_OFFSET does not account for if the unbiased thread pointer points to the start of the TCB (arm and x86) or the end of the TCB (MIPS, PowerPC, and RISC-V). Note also that for amd64, the struct tcb does not include the unused tcb_spare field included in the current structure in libthr. libthr does not use this field, and the existing calls in libc and rtld that allocate a TCB for amd64 assume it is the size of 3 Elf_Addr's (and thus do not allocate room for tcb_spare). A <sys/_tls_variant_i.h> header is used by architectures using Variant I TLS which uses a common struct tcb. Reviewed by: kib (older version of x86/tls.h), jrtc27 Sponsored by: The University of Cambridge, Google Inc. Differential Revision: https://reviews.freebsd.org/D33351
This is the more standard name for the bias of dtv pointers used on other platforms. This also fixes a few other places that were using the wrong bias previously on MIPS such as dlpi_tls_data in struct dl_phdr_info and the recently added __libc_tls_get_addr(). Reviewed by: kib, jrtc27 Sponsored by: The University of Cambridge, Google Inc. Differential Revision: https://reviews.freebsd.org/D33346
After a round of cleanups in late 2020, all definitions are functionally identical. This removes a rotted __aligned(8) on arm. It was added in b7112ead32bc50ef9744099bdbb1cfbd6e906b2a and was intended to align the args member so that 64-bit types (off_t, etc) could be safely read on armeb compiled with clang. With the removal of armev, this is no longer needed (armv7 requires that 32-bit aligned reads of 64-bit values be supported and we enable such support on armv6). As further evidence this is unnecessary, cleanups to struct syscall_args have resulted in args being 32-bit aligned on 32-bit systems. The sole effect is to bloat the struct by 4 bytes. Reviewed by: kib, jhb, imp Differential Revision: https://reviews.freebsd.org/D33308
This definition enables callers to estimate remaining space on the kstack, and take action on it. Notably, it enables optimizations in the GEOM and netgraph subsystems to directly dispatch work items when there is sufficient stack space, rather than queuing them for a worker thread. Implement it for riscv, arm, and mips. Remove the #ifdefs, so it will not go unimplemented elsewhere. PR: 259157 Reviewed by: mav, kib, markj (previous version) MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32580