File: [local] / sys / arch / amd64 / amd64 / vm_machdep.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:05:00 2008 UTC (16 years, 6 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
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/* $OpenBSD: vm_machdep.c,v 1.10 2007/05/27 20:59:25 miod Exp $ */
/* $NetBSD: vm_machdep.c,v 1.1 2003/04/26 18:39:33 fvdl Exp $ */
/*-
* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
* Copyright (c) 1982, 1986 The Regents of the University of California.
* 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. 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/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 <sys/signalvar.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>
#include <machine/mtrr.h>
void setredzone(struct proc *);
/*
* Finish a fork operation, with process p2 nearly set up.
* Copy and update the kernel stack and pcb, making the child
* ready to run, and marking it so that it can return differently
* than the parent. Returns 1 in the child process, 0 in the parent.
* We currently double-map the user area so that the stack is at the same
* address in each process; in the future we will probably relocate
* the frame pointers on the stack after copying.
*/
void
cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
void (*func)(void *), void *arg)
{
struct pcb *pcb = &p2->p_addr->u_pcb;
struct trapframe *tf;
struct switchframe *sf;
/*
* 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 (p1->p_addr->u_pcb.pcb_fpcpu != NULL)
fpusave_proc(p1, 1);
p2->p_md.md_flags = p1->p_md.md_flags;
/* Copy pcb from proc p1 to p2. */
if (p1 == curproc) {
/* Sync the PCB before we copy it. */
savectx(curpcb);
}
#ifdef DIAGNOSTIC
else if (p1 != &proc0)
panic("cpu_fork: curproc");
#endif
*pcb = p1->p_addr->u_pcb;
/*
* Preset these so that gdt_compact() doesn't get confused if called
* during the allocations below.
*
* Note: pcb_ldt_sel is handled in the pmap_activate() call when
* we run the new process.
*/
p2->p_md.md_tss_sel = GSEL(GNULL_SEL, SEL_KPL);
/*
* Activate the address space. Note this will refresh pcb_ldt_sel.
*/
pmap_activate(p2);
/* Fix up the TSS. */
pcb->pcb_tss.tss_rsp0 = (u_int64_t)p2->p_addr + USPACE - 16;
pcb->pcb_tss.tss_ist[0] = (u_int64_t)p2->p_addr + PAGE_SIZE - 16;
p2->p_md.md_tss_sel = tss_alloc(pcb);
/*
* Copy the trapframe.
*/
p2->p_md.md_regs = tf = (struct trapframe *)pcb->pcb_tss.tss_rsp0 - 1;
*tf = *p1->p_md.md_regs;
setredzone(p2);
/*
* If specified, give the child a different stack.
*/
if (stack != NULL)
tf->tf_rsp = (u_int64_t)stack + stacksize;
sf = (struct switchframe *)tf - 1;
sf->sf_r12 = (u_int64_t)func;
sf->sf_r13 = (u_int64_t)arg;
/* XXX fork of init(8) returns via proc_trampoline() */
if (p2->p_pid == 1)
sf->sf_rip = (u_int64_t)proc_trampoline;
else
sf->sf_rip = (u_int64_t)child_trampoline;
pcb->pcb_rsp = (u_int64_t)sf;
pcb->pcb_rbp = 0;
}
/*
* cpu_exit is called as the last action during exit.
*
* We clean up a little and then call switch_exit() with the old proc as an
* argument. switch_exit() first switches to proc0's context, and finally
* jumps into switch() to wait for another process to wake up.
*/
void
cpu_exit(struct proc *p)
{
/* If we were using the FPU, forget about it. */
if (p->p_addr->u_pcb.pcb_fpcpu != NULL)
fpusave_proc(p, 0);
if (p->p_md.md_flags & MDP_USEDMTRR)
mtrr_clean(p);
/*
* No need to do user LDT cleanup here; it's handled in
* pmap_destroy().
*/
switch_exit(p, exit2);
}
/*
* cpu_wait is called from reaper() to let machine-dependent
* code free machine-dependent resources that couldn't be freed
* in cpu_exit().
*/
void
cpu_wait(struct proc *p)
{
/* Nuke the TSS. */
tss_free(p->p_md.md_tss_sel);
}
/*
* 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 proc *p, struct vnode *vp, struct ucred *cred,
struct core *chdr)
{
struct md_core md_core;
struct coreseg cseg;
int error;
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);
/* Save integer registers. */
error = process_read_regs(p, &md_core.intreg);
if (error)
return error;
/* Save floating point registers. */
error = process_read_fpregs(p, &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 = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize,
(off_t)chdr->c_hdrsize, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred,
NULL, p);
if (error)
return error;
error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&md_core, sizeof(md_core),
(off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
IO_NODELOCKED|IO_UNIT, cred, NULL, p);
if (error)
return error;
chdr->c_nseg++;
return 0;
}
/*
* Set a red zone in the kernel stack after the u. area.
*/
void
setredzone(struct proc *p)
{
#if 0
pmap_remove(pmap_kernel(), (vaddr_t)p->p_addr + PAGE_SIZE,
(vaddr_t)p->p_addr + 2 * PAGE_SIZE);
pmap_update(pmap_kernel());
#endif
}
/*
* 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_valloc_wait(phys_map, len);
bp->b_data = (caddr_t)(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_wakeup(phys_map, addr, len);
bp->b_data = bp->b_saveaddr;
bp->b_saveaddr = 0;
}