HelenOS sources
kernel/arch/abs32le/include/arch/context.h
kernel/arch/amd64/include/arch/context.h
kernel/arch/arm32/include/arch/context.h
kernel/arch/arm64/include/arch/context.h
kernel/arch/ia32/include/arch/context.h
kernel/arch/ia64/include/arch/context.h
kernel/arch/mips32/include/arch/context.h
kernel/arch/ppc32/include/arch/context.h
kernel/arch/riscv64/include/arch/context.h
kernel/arch/sparc64/include/arch/context.h
kernel/generic/include/context.h
uspace/drv/bus/usb/xhci/hw_struct/context.h
uspace/lib/c/include/context.h
uspace/lib/gfx/include/gfx/context.h
uspace/lib/gfx/include/types/gfx/context.h
uspace/lib/gfx/include/types/gfx/ops/context.h
uspace/lib/gfx/private/context.h
uspace/lib/posix/include/libc/context.h
HelenOS homepage, sources at GitHub