File: [local] / sys / arch / alpha / alpha / vm_machdep.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:04:43 2008 UTC (16 years, 3 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 1.33 2007/05/27 20:59:24 miod Exp $ */
/* $NetBSD: vm_machdep.c,v 1.55 2000/03/29 03:49:48 simonb Exp $ */
/*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/user.h>
#include <sys/core.h>
#include <sys/exec.h>
#include <uvm/uvm_extern.h>
#include <machine/cpu.h>
#include <machine/pmap.h>
#include <machine/reg.h>
/*
* Dump the machine specific header information at the start of a core dump.
*/
int
cpu_coredump(p, vp, cred, chdr)
struct proc *p;
struct vnode *vp;
struct ucred *cred;
struct core *chdr;
{
int error;
struct md_coredump cpustate;
struct coreseg cseg;
CORE_SETMAGIC(*chdr, COREMAGIC, MID_ALPHA, 0);
chdr->c_hdrsize = ALIGN(sizeof(*chdr));
chdr->c_seghdrsize = ALIGN(sizeof(cseg));
chdr->c_cpusize = sizeof(cpustate);
cpustate.md_tf = *p->p_md.md_tf;
cpustate.md_tf.tf_regs[FRAME_SP] = alpha_pal_rdusp(); /* XXX */
if (p->p_md.md_flags & MDP_FPUSED) {
if (p->p_addr->u_pcb.pcb_fpcpu != NULL)
fpusave_proc(p, 1);
cpustate.md_fpstate = p->p_addr->u_pcb.pcb_fp;
} else
bzero(&cpustate.md_fpstate, sizeof(cpustate.md_fpstate));
CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_ALPHA, 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)&cpustate, sizeof(cpustate),
(off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
IO_NODELOCKED|IO_UNIT, cred, NULL, p);
if (!error)
chdr->c_nseg++;
return error;
}
/*
* cpu_exit is called as the last action during exit.
* We block interrupts and call switch_exit. switch_exit switches
* to proc0's PCB and stack, then jumps into the middle of cpu_switch,
* as if it were switching from proc0.
*/
void
cpu_exit(p)
struct proc *p;
{
if (p->p_addr->u_pcb.pcb_fpcpu != NULL)
fpusave_proc(p, 0);
/*
* Deactivate the exiting address space before the vmspace
* is freed. Note that we will continue to run on this
* vmspace's context until the switch to proc0 in switch_exit().
*/
pmap_deactivate(p);
(void) splhigh();
switch_exit(p);
/* NOTREACHED */
}
/*
* Finish a fork operation, with process p2 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
* switch_trampoline() and call child_return() with p2 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.
*
* p1 is the process being forked;
*
* 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_fork(p1, p2, stack, stacksize, func, arg)
struct proc *p1, *p2;
void *stack;
size_t stacksize;
void (*func)(void *);
void *arg;
{
struct user *up = p2->p_addr;
p2->p_md.md_tf = p1->p_md.md_tf;
#ifndef NO_IEEE
p2->p_md.md_flags = p1->p_md.md_flags & (MDP_FPUSED | MDP_FP_C);
#else
p2->p_md.md_flags = p1->p_md.md_flags & MDP_FPUSED;
#endif
/*
* Cache the physical address of the pcb, so we can
* swap to it easily.
*/
p2->p_md.md_pcbpaddr = (void *)vtophys((vaddr_t)&up->u_pcb);
/*
* Copy floating point state from the FP chip to the PCB
* if this process has state stored there.
*/
if (p1->p_addr->u_pcb.pcb_fpcpu != NULL)
fpusave_proc(p1, 1);
/*
* Copy pcb and stack from proc p1 to p2.
* We do this as cheaply as possible, copying only the active
* part of the stack. The stack and pcb need to agree;
*/
p2->p_addr->u_pcb = p1->p_addr->u_pcb;
p2->p_addr->u_pcb.pcb_hw.apcb_usp = alpha_pal_rdusp();
/*
* Arrange for a non-local goto when the new process
* is started, to resume here, returning nonzero from setjmp.
*/
#ifdef DIAGNOSTIC
/*
* If p1 != curproc && p1 == &proc0, we are creating a kernel
* thread.
*/
if (p1 != curproc && p1 != &proc0)
panic("cpu_fork: curproc");
if ((up->u_pcb.pcb_hw.apcb_flags & ALPHA_PCB_FLAGS_FEN) != 0)
printf("DANGER WILL ROBINSON: FEN SET IN cpu_fork!\n");
#endif
/*
* create the child's kernel stack, from scratch.
*/
{
struct trapframe *p2tf;
/*
* Pick a stack pointer, leaving room for a trapframe;
* copy trapframe from parent so return to user mode
* will be to right address, with correct registers.
*/
p2tf = p2->p_md.md_tf = (struct trapframe *)
((char *)p2->p_addr + USPACE - sizeof(struct trapframe));
bcopy(p1->p_md.md_tf, p2->p_md.md_tf,
sizeof(struct trapframe));
/*
* Set up return-value registers as fork() libc stub expects.
*/
p2tf->tf_regs[FRAME_V0] = p1->p_pid; /* parent's pid */
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child */
/*
* If specificed, give the child a different stack.
*/
if (stack != NULL)
p2tf->tf_regs[FRAME_SP] = (u_long)stack + stacksize;
/*
* Arrange for continuation at child_return(), which
* will return to exception_return(). Note that the child
* process doesn't stay in the kernel for long!
*/
up->u_pcb.pcb_hw.apcb_ksp = (u_int64_t)p2tf;
up->u_pcb.pcb_context[0] = (u_int64_t)func;
up->u_pcb.pcb_context[1] =
(u_int64_t)exception_return; /* s1: ra */
up->u_pcb.pcb_context[2] = (u_int64_t)arg;
up->u_pcb.pcb_context[7] =
(u_int64_t)switch_trampoline; /* ra: assembly magic */
up->u_pcb.pcb_context[8] = ALPHA_PSL_IPL_0; /* ps: IPL */
}
}
/*
* 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(bp, len)
struct buf *bp;
vsize_t len;
{
vaddr_t faddr, taddr, off;
paddr_t pa;
struct proc *p;
if ((bp->b_flags & B_PHYS) == 0)
panic("vmapbuf");
p = bp->b_proc;
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);
len = atop(len);
while (len--) {
if (pmap_extract(vm_map_pmap(&p->p_vmspace->vm_map),
faddr, &pa) == FALSE)
panic("vmapbuf: null page frame");
pmap_enter(vm_map_pmap(phys_map), taddr, trunc_page(pa),
VM_PROT_READ|VM_PROT_WRITE, PMAP_WIRED);
faddr += PAGE_SIZE;
taddr += PAGE_SIZE;
}
pmap_update(vm_map_pmap(phys_map));
}
/*
* Unmap a previously-mapped user I/O request.
*/
void
vunmapbuf(bp, len)
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_remove(vm_map_pmap(phys_map), addr, addr + len);
pmap_update(vm_map_pmap(phys_map));
uvm_km_free_wakeup(phys_map, addr, len);
bp->b_data = bp->b_saveaddr;
bp->b_saveaddr = NULL;
}