NetBSD-5.0.2/sys/arch/i386/i386/vm_machdep.c
/* $NetBSD: vm_machdep.c,v 1.139.8.2 2009/02/16 03:07:03 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 1.139.8.2 2009/02/16 03:07:03 snj Exp $");
#include "opt_user_ldt.h"
#include "opt_mtrr.h"
#include "opt_execfmt.h"
#include "opt_coredump.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/mtrr.h>
#include "npx.h"
static void setredzone(struct lwp *l);
void
cpu_proc_fork(struct proc *p1, struct proc *p2)
{
p2->p_md.md_flags = p1->p_md.md_flags;
}
/*
* 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 NNPX > 0
/*
* Save p1's npx h/w state to p1's pcb so that we can copy it.
*/
if (l1->l_addr->u_pcb.pcb_fpcpu != NULL)
npxsave_lwp(l1, true);
#endif
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_lwp_fork: curlwp");
#endif
*pcb = l1->l_addr->u_pcb;
#if defined(XEN)
pcb->pcb_iopl = SEL_KPL;
#endif /* defined(XEN) */
/*
* Fix up the ring0 esp.
*/
pcb->pcb_esp0 = USER_TO_UAREA(l2->l_addr) + KSTACK_SIZE - 16;
pcb->pcb_iomap = NULL;
l2->l_md.md_astpending = 0;
memcpy(&pcb->pcb_fsd, curpcb->pcb_fsd, sizeof(pcb->pcb_fsd));
memcpy(&pcb->pcb_gsd, curpcb->pcb_gsd, sizeof(pcb->pcb_gsd));
/*
* Copy the trapframe.
*/
l2->l_md.md_regs = tf = (struct trapframe *)pcb->pcb_esp0 - 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_esp = (u_int)stack + stacksize;
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_esi = (int)func;
sf->sf_ebx = (int)arg;
sf->sf_eip = (int)lwp_trampoline;
pcb->pcb_esp = (int)sf;
pcb->pcb_ebp = (int)l;
}
void
cpu_swapin(struct lwp *l)
{
setredzone(l);
}
void
cpu_swapout(struct lwp *l)
{
#if NNPX > 0
/*
* Make sure we save the FP state before the user area vanishes.
*/
npxsave_lwp(l, true);
#endif
}
/*
* cpu_lwp_free is called from exit() to let machine-dependent
* code free machine-dependent resources. Note that this routine
* must not block.
*/
void
cpu_lwp_free(struct lwp *l, int proc)
{
#if NNPX > 0
/* If we were using the FPU, forget about it. */
if (l->l_addr->u_pcb.pcb_fpcpu != NULL)
npxsave_lwp(l, false);
#endif
#ifdef MTRR
if (proc && l->l_proc->p_md.md_flags & MDP_USEDMTRR)
mtrr_clean(l->l_proc);
#endif
}
/*
* cpu_lwp_free2 is called when an LWP is being reaped. This routine
* may block.
*/
void
cpu_lwp_free2(struct lwp *l)
{
/* nothing */
}
#if (defined(EXEC_AOUT) || defined(EXEC_COFF) || defined(EXEC_ECOFF) || \
defined(EXEC_MACHO) || defined(LKM)) && defined(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_SYSSPACE,
&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 /* DIAGNOSTIC */
}
/*
* Convert kernel VA to physical address
*/
int
kvtop(register 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");
faddr = trunc_page((vaddr_t)(bp->b_saveaddr = 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;
}
pmap_update(pmap_kernel());
}
/*
* 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;
}