/*- * Copyright (c) 1982, 1986 The Regents of the University of California. * Copyright (c) 1989, 1990 William Jolitz * Copyright (c) 1994 John Dyson * All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department, and William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ * $FreeBSD$ */ /*- * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. * All rights reserved. * * Author: Chris G. Demetriou * * Permission to use, copy, modify and distribute this software and * its documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Finish a fork operation, with process p2 nearly set up. * Copy and update the pcb, set up the stack so that the child * ready to run and return to user mode. */ void cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) { struct proc *p1; struct trapframe *tf; struct callframe *cf; struct pcb *pcb; KASSERT(td1 == curthread || td1 == &thread0, ("cpu_fork: p1 not curproc and not proc0")); CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags); if ((flags & RFPROC) == 0) return; p1 = td1->td_proc; pcb = (struct pcb *)((td2->td_kstack + td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU); td2->td_pcb = pcb; /* Copy the pcb */ bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); /* * Create a fresh stack for the new process. * Copy the trap frame for the return to user mode as if from a * syscall. This copies most of the user mode register values. */ tf = (struct trapframe *)pcb - 1; bcopy(td1->td_frame, tf, sizeof(*tf)); /* Set up trap frame. */ tf->fixreg[FIRSTARG] = 0; tf->fixreg[FIRSTARG + 1] = 0; tf->cr &= ~0x10000000; td2->td_frame = tf; cf = (struct callframe *)tf - 1; memset(cf, 0, sizeof(struct callframe)); cf->cf_func = (register_t)fork_return; cf->cf_arg0 = (register_t)td2; cf->cf_arg1 = (register_t)tf; pcb->pcb_sp = (register_t)cf; pcb->pcb_lr = (register_t)fork_trampoline; pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR]; /* * Now cpu_switch() can schedule the new process. */ } /* * Intercept the return address from a freshly forked process that has NOT * been scheduled yet. * * This is needed to make kernel threads stay in kernel mode. */ void cpu_set_fork_handler(td, func, arg) struct thread *td; void (*func)(void *); void *arg; { struct callframe *cf; CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x", (u_int)td, (u_int)func, (u_int)arg); cf = (struct callframe *)td->td_pcb->pcb_sp; cf->cf_func = (register_t)func; cf->cf_arg0 = (register_t)arg; } void cpu_exit(td) register struct thread *td; { } /* Temporary helper */ void cpu_throw(struct thread *old, struct thread *new) { cpu_switch(old, new); panic("cpu_throw() didn't"); } /* * Reset back to firmware. */ void cpu_reset() { OF_exit(); } /* * Allocate an sf_buf for the given vm_page. On this machine, however, there * is no sf_buf object. Instead, an opaque pointer to the given vm_page is * returned. */ struct sf_buf * sf_buf_alloc(struct vm_page *m, int pri) { return ((struct sf_buf *)m); } /* * Free the sf_buf. In fact, do nothing because there are no resources * associated with the sf_buf. */ void sf_buf_free(struct sf_buf *sf) { } /* * Software interrupt handler for queued VM system processing. */ void swi_vm(void *dummy) { #if 0 /* XXX: Don't have busdma stuff yet */ if (busdma_swi_pending != 0) busdma_swi(); #endif } /* * Tell whether this address is in some physical memory region. * Currently used by the kernel coredump code in order to avoid * dumping the ``ISA memory hole'' which could cause indefinite hangs, * or other unpredictable behaviour. */ int is_physical_memory(addr) vm_offset_t addr; { /* * stuff other tests for known memory-mapped devices (PCI?) * here */ return 1; } /* * KSE functions */ void cpu_thread_exit(struct thread *td) { } void cpu_thread_clean(struct thread *td) { } void cpu_thread_setup(struct thread *td) { struct pcb *pcb; pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU); td->td_pcb = pcb; td->td_frame = (struct trapframe *)pcb - 1; } void cpu_thread_swapin(struct thread *td) { } void cpu_thread_swapout(struct thread *td) { } void cpu_set_upcall(struct thread *td, struct thread *td0) { struct pcb *pcb2; struct trapframe *tf; struct callframe *cf; pcb2 = td->td_pcb; /* Copy the upcall pcb */ bcopy(td0->td_pcb, pcb2, sizeof(*pcb2)); /* Create a stack for the new thread */ tf = td->td_frame; bcopy(td0->td_frame, tf, sizeof(struct trapframe)); tf->fixreg[FIRSTARG] = 0; tf->fixreg[FIRSTARG + 1] = 0; tf->cr &= ~0x10000000; /* Set registers for trampoline to user mode. */ cf = (struct callframe *)tf - 1; memset(cf, 0, sizeof(struct callframe)); cf->cf_func = (register_t)fork_return; cf->cf_arg0 = (register_t)td; cf->cf_arg1 = (register_t)tf; pcb2->pcb_sp = (register_t)cf; pcb2->pcb_lr = (register_t)fork_trampoline; pcb2->pcb_usr = kernel_pmap->pm_sr[USER_SR]; } void cpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku) { struct trapframe *tf; uint32_t sp; tf = td->td_frame; /* align stack and alloc space for frame ptr and saved LR */ sp = ((uint32_t)ku->ku_stack.ss_sp + ku->ku_stack.ss_size - 2*sizeof(u_int32_t)) & ~0x1f; bzero(tf, sizeof(struct trapframe)); tf->fixreg[1] = (register_t)sp; tf->fixreg[3] = (register_t)ku->ku_mailbox; tf->srr0 = (register_t)ku->ku_func; tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; td->td_pcb->pcb_flags = 0; td->td_retval[0] = (register_t)ku->ku_func; td->td_retval[1] = 0; }