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/* $OpenBSD: vm_machdep.c,v 1.17 2011/09/22 13:50:30 deraadt Exp $ */
/*
* Copyright (c) 2005 Michael Shalayeff
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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/ptrace.h>
#include <sys/exec.h>
#include <sys/core.h>
#include <sys/pool.h>
#include <machine/psl.h>
#include <machine/pmap.h>
#include <machine/pcb.h>
#include <uvm/uvm.h>
extern struct pool hppa_fppl;
/*
* Dump the machine specific header information at the start of a core dump.
*/
int
cpu_coredump(struct proc *p, struct vnode *vp, struct ucred *cred,
struct core *core)
{
struct md_coredump md_core;
struct coreseg cseg;
off_t off;
int error;
CORE_SETMAGIC(*core, COREMAGIC, MID_HPPA20, 0);
core->c_hdrsize = ALIGN(sizeof(*core));
core->c_seghdrsize = ALIGN(sizeof(cseg));
core->c_cpusize = sizeof(md_core);
process_read_regs(p, &md_core.md_reg);
process_read_fpregs(p, &md_core.md_fpreg);
CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_HPPA20, CORE_CPU);
cseg.c_addr = 0;
cseg.c_size = core->c_cpusize;
#define write(vp, addr, n) \
vn_rdwr(UIO_WRITE, (vp), (caddr_t)(addr), (n), off, \
UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, NULL, p)
off = core->c_hdrsize;
if ((error = write(vp, &cseg, core->c_seghdrsize)))
return error;
off += core->c_seghdrsize;
if ((error = write(vp, &md_core, sizeof md_core)))
return error;
#undef write
core->c_nseg++;
return error;
}
void
cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
void (*func)(void *), void *arg)
{
extern register_t switch_tramp_p;
struct pcb *pcbp;
struct trapframe *tf;
register_t sp, osp;
#ifdef DIAGNOSTIC
if (round_page(sizeof(struct user) + sizeof(*tf)) > PAGE_SIZE)
panic("USPACE too small for user");
#endif
fpu_proc_save(p1);
pcbp = &p2->p_addr->u_pcb;
bcopy(&p1->p_addr->u_pcb, pcbp, sizeof(*pcbp));
/* space is cached for the copy{in,out}'s pleasure */
pcbp->pcb_space = p2->p_vmspace->vm_map.pmap->pm_space;
pcbp->pcb_fpstate = pool_get(&hppa_fppl, PR_WAITOK);
*pcbp->pcb_fpstate = *p1->p_addr->u_pcb.pcb_fpstate;
/* reset any of the pending FPU exceptions from parent */
pcbp->pcb_fpstate->hfp_regs.fpr_regs[0] =
HPPA_FPU_FORK(pcbp->pcb_fpstate->hfp_regs.fpr_regs[0]);
pcbp->pcb_fpstate->hfp_regs.fpr_regs[1] = 0;
pcbp->pcb_fpstate->hfp_regs.fpr_regs[2] = 0;
pcbp->pcb_fpstate->hfp_regs.fpr_regs[3] = 0;
sp = (register_t)p2->p_addr + PAGE_SIZE;
p2->p_md.md_regs = tf = (struct trapframe *)sp;
sp += sizeof(struct trapframe);
bcopy(p1->p_md.md_regs, tf, sizeof(*tf));
tf->tf_vtop = (paddr_t)p2->p_vmspace->vm_map.pmap->pm_pdir;
tf->tf_cr30 = (paddr_t)pcbp->pcb_fpstate;
tf->tf_sr0 = tf->tf_sr1 = tf->tf_sr2 = tf->tf_sr3 =
tf->tf_sr4 = tf->tf_sr5 = tf->tf_sr6 =
tf->tf_iisq[0] = tf->tf_iisq[1] =
p2->p_vmspace->vm_map.pmap->pm_space;
tf->tf_pidr1 = tf->tf_pidr2 = pmap_sid2pid(tf->tf_sr0);
/*
* theoretically these could be inherited from the father,
* but just in case.
*/
tf->tf_sr7 = HPPA_SID_KERNEL;
tf->tf_eiem = mfctl(CR_EIEM);
tf->tf_ipsw = PSL_C | PSL_Q | PSL_P | PSL_D | PSL_I /* | PSL_L */ |
PSL_O | PSL_W;
/*
* If specified, give the child a different stack.
*/
if (stack != NULL)
tf->tf_sp = (register_t)stack;
/*
* Build stack frames for the cpu_switchto & co.
*/
osp = sp + HPPA_FRAME_SIZE;
*(register_t*)(osp - HPPA_FRAME_SIZE) = 0;
*(register_t*)(osp + HPPA_FRAME_RP) = switch_tramp_p;
*(register_t*)(osp) = (osp - HPPA_FRAME_SIZE);
sp = osp + HPPA_FRAME_SIZE + 20*8; /* frame + callee-saved registers */
*(register_t*)(sp - HPPA_FRAME_SIZE + 0) = (register_t)arg;
*(register_t*)(sp - HPPA_FRAME_SIZE + 8) = KERNMODE(func);
*(register_t*)(sp - HPPA_FRAME_SIZE + 16) = 0; /* cpl */
pcbp->pcb_ksp = sp;
}
void
cpu_exit(struct proc *p)
{
struct pcb *pcb = &p->p_addr->u_pcb;
fpu_proc_flush(p);
pool_put(&hppa_fppl, pcb->pcb_fpstate);
pmap_deactivate(p);
sched_exit(p);
}
/*
* Map an IO request into kernel virtual address space.
*/
void
vmapbuf(struct buf *bp, vsize_t len)
{
struct pmap *pm = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
vaddr_t kva, uva;
vsize_t size, off;
#ifdef DIAGNOSTIC
if ((bp->b_flags & B_PHYS) == 0)
panic("vmapbuf");
#endif
bp->b_saveaddr = bp->b_data;
uva = trunc_page((vaddr_t)bp->b_data);
off = (vaddr_t)bp->b_data - uva;
size = round_page(off + len);
kva = uvm_km_valloc_prefer_wait(phys_map, size, uva);
bp->b_data = (caddr_t)(kva + off);
while (size > 0) {
paddr_t pa;
if (pmap_extract(pm, uva, &pa) == FALSE)
panic("vmapbuf: null page frame");
else
pmap_kenter_pa(kva, pa, UVM_PROT_RW);
uva += PAGE_SIZE;
kva += PAGE_SIZE;
size -= PAGE_SIZE;
}
pmap_update(pmap_kernel());
}
/*
* Unmap IO request from the kernel virtual address space.
*/
void
vunmapbuf(struct buf *bp, vsize_t len)
{
vaddr_t addr, off;
#ifdef DIAGNOSTIC
if ((bp->b_flags & B_PHYS) == 0)
panic("vunmapbuf");
#endif
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 = NULL;
}
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