/* $NetBSD: vm_machdep.c,v 1.34.4.1 2009/02/16 03:04:38 snj Exp $ */ /*- * Copyright (c) 1982, 1986 The Regents of the University of California. * 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. 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. * * @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 */ /*- * Copyright (c) 1995 Charles M. Hannum. All rights reserved. * Copyright (c) 1989, 1990 William Jolitz * 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. * * @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 */ /* * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.34.4.1 2009/02/16 03:04:38 snj Exp $"); #include "opt_coredump.h" #include "opt_user_ldt.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/malloc.h> #include <sys/vnode.h> #include <sys/buf.h> #include <sys/user.h> #include <sys/core.h> #include <sys/exec.h> #include <sys/ptrace.h> #include <uvm/uvm_extern.h> #include <machine/cpu.h> #include <machine/gdt.h> #include <machine/reg.h> #include <machine/specialreg.h> #include <machine/fpu.h> #ifdef MTRR #include <machine/mtrr.h> #endif extern char x86_64_doubleflt_stack[]; static void setredzone(struct lwp *); void cpu_proc_fork(struct proc *p1, struct proc *p2) { p2->p_md.md_flags = p1->p_md.md_flags; if (p1->p_flag & PK_32) p2->p_flag |= PK_32; } /* * Finish a new thread operation, with lwp l2 nearly set up. * Copy and update the pcb and trap frame, making the child ready to run. * * Rig the child's kernel stack so that it will start out in * lwp_trampoline() and call child_return() with l2 as an * argument. This causes the newly-created child process to go * directly to user level with an apparent return value of 0 from * fork(), while the parent process returns normally. * * l1 is the thread being forked; if l1 == &lwp0, we are creating * a kernel thread, and the return path and argument are specified with * `func' and `arg'. * * If an alternate user-level stack is requested (with non-zero values * in both the stack and stacksize args), set up the user stack pointer * accordingly. */ void cpu_lwp_fork(struct lwp *l1, struct lwp *l2, void *stack, size_t stacksize, void (*func)(void *), void *arg) { struct pcb *pcb = &l2->l_addr->u_pcb; struct trapframe *tf; /* * If fpuproc != p1, then the fpu h/w state is irrelevant and the * state had better already be in the pcb. This is true for forks * but not for dumps. * * If fpuproc == p1, then we have to save the fpu h/w state to * p1's pcb so that we can copy it. */ if (l1->l_addr->u_pcb.pcb_fpcpu != NULL) fpusave_lwp(l1, true); l2->l_md.md_flags = l1->l_md.md_flags; /* Copy pcb from proc p1 to p2. */ if (l1 == curlwp) { /* Sync the PCB before we copy it. */ savectx(curpcb); } #ifdef DIAGNOSTIC else if (l1 != &lwp0) panic("cpu_fork: curproc"); #endif *pcb = l1->l_addr->u_pcb; #if defined(XEN) pcb->pcb_iopl = SEL_KPL; #endif /* defined(XEN) */ /* * Note: pcb_ldt_sel is handled in the pmap_activate() call when * we run the new process. */ l2->l_md.md_astpending = 0; pcb->pcb_rsp0 = (USER_TO_UAREA(l2->l_addr) + KSTACK_SIZE - 16) & ~0xf; /* * Copy the trapframe. */ l2->l_md.md_regs = tf = (struct trapframe *)pcb->pcb_rsp0 - 1; *tf = *l1->l_md.md_regs; tf->tf_trapno = T_ASTFLT; setredzone(l2); /* * If specified, give the child a different stack. */ if (stack != NULL) tf->tf_rsp = (uint64_t)stack + stacksize; pcb->pcb_fs = l1->l_addr->u_pcb.pcb_fs; pcb->pcb_gs = l1->l_addr->u_pcb.pcb_gs; cpu_setfunc(l2, func, arg); } void cpu_setfunc(struct lwp *l, void (*func)(void *), void *arg) { struct pcb *pcb = &l->l_addr->u_pcb; struct trapframe *tf = l->l_md.md_regs; struct switchframe *sf = (struct switchframe *)tf - 1; sf->sf_r12 = (uint64_t)func; sf->sf_r13 = (uint64_t)arg; if (func == child_return && !(l->l_proc->p_flag & PK_32)) sf->sf_rip = (uint64_t)child_trampoline; else sf->sf_rip = (uint64_t)lwp_trampoline; pcb->pcb_rsp = (uint64_t)sf; pcb->pcb_rbp = (uint64_t)l; } void cpu_swapin(struct lwp *l) { setredzone(l); } void cpu_swapout(struct lwp *l) { /* * Make sure we save the FP state before the user area vanishes. */ fpusave_lwp(l, true); } void cpu_lwp_free(struct lwp *l, int proc) { /* If we were using the FPU, forget about it. */ if (l->l_addr->u_pcb.pcb_fpcpu != NULL) fpusave_lwp(l, false); #ifdef MTRR if (proc && l->l_md.md_flags & MDP_USEDMTRR) mtrr_clean(l->l_proc); #endif } void cpu_lwp_free2(struct lwp *l) { /* nothing */ } #ifdef COREDUMP /* * Dump the machine specific segment at the start of a core dump. */ struct md_core { struct reg intreg; struct fpreg freg; }; int cpu_coredump(struct lwp *l, void *iocookie, struct core *chdr) { struct md_core md_core; struct coreseg cseg; int error; if (iocookie == NULL) { CORE_SETMAGIC(*chdr, COREMAGIC, MID_MACHINE, 0); chdr->c_hdrsize = ALIGN(sizeof(*chdr)); chdr->c_seghdrsize = ALIGN(sizeof(cseg)); chdr->c_cpusize = sizeof(md_core); chdr->c_nseg++; return 0; } /* Save integer registers. */ error = process_read_regs(l, &md_core.intreg); if (error) return error; /* Save floating point registers. */ error = process_read_fpregs(l, &md_core.freg); if (error) return error; CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_MACHINE, CORE_CPU); cseg.c_addr = 0; cseg.c_size = chdr->c_cpusize; error = coredump_write(iocookie, UIO_SYSSPACE, &cseg, chdr->c_seghdrsize); if (error) return error; return coredump_write(iocookie, UIO_USERSPACE, &md_core, sizeof(md_core)); } #endif /* * Set a red zone in the kernel stack after the u. area. */ static void setredzone(struct lwp *l) { #ifdef DIAGNOSTIC vaddr_t addr; addr = USER_TO_UAREA(l->l_addr); pmap_remove(pmap_kernel(), addr, addr + PAGE_SIZE); pmap_update(pmap_kernel()); #endif } /* * Convert kernel VA to physical address */ int kvtop(void *addr) { paddr_t pa; if (pmap_extract(pmap_kernel(), (vaddr_t)addr, &pa) == false) panic("kvtop: zero page frame"); return((int)pa); } /* * Map a user I/O request into kernel virtual address space. * Note: the pages are already locked by uvm_vslock(), so we * do not need to pass an access_type to pmap_enter(). */ void vmapbuf(struct buf *bp, vsize_t len) { vaddr_t faddr, taddr, off; paddr_t fpa; if ((bp->b_flags & B_PHYS) == 0) panic("vmapbuf"); bp->b_saveaddr = bp->b_data; faddr = trunc_page((vaddr_t)bp->b_data); off = (vaddr_t)bp->b_data - faddr; len = round_page(off + len); taddr = uvm_km_alloc(phys_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA); bp->b_data = (void *)(taddr + off); /* * The region is locked, so we expect that pmap_pte() will return * non-NULL. * XXX: unwise to expect this in a multithreaded environment. * anything can happen to a pmap between the time we lock a * region, release the pmap lock, and then relock it for * the pmap_extract(). * * no need to flush TLB since we expect nothing to be mapped * where we we just allocated (TLB will be flushed when our * mapping is removed). */ while (len) { (void) pmap_extract(vm_map_pmap(&bp->b_proc->p_vmspace->vm_map), faddr, &fpa); pmap_kenter_pa(taddr, fpa, VM_PROT_READ|VM_PROT_WRITE); faddr += PAGE_SIZE; taddr += PAGE_SIZE; len -= PAGE_SIZE; } } /* * Unmap a previously-mapped user I/O request. */ void vunmapbuf(struct buf *bp, vsize_t len) { vaddr_t addr, off; if ((bp->b_flags & B_PHYS) == 0) panic("vunmapbuf"); addr = trunc_page((vaddr_t)bp->b_data); off = (vaddr_t)bp->b_data - addr; len = round_page(off + len); pmap_kremove(addr, len); pmap_update(pmap_kernel()); uvm_km_free(phys_map, addr, len, UVM_KMF_VAONLY); bp->b_data = bp->b_saveaddr; bp->b_saveaddr = 0; }