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/*
* linux/arch/mips/kernel/process.c
*
* Copyright (C) 1995 Ralf Baechle
* written by Ralf Baechle
*/
/*
* This file handles the architecture-dependent parts of process handling..
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/ldt.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <asm/bootinfo.h>
#include <asm/segment.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/mipsregs.h>
#include <asm/processor.h>
#include <asm/stackframe.h>
#include <asm/io.h>
asmlinkage void ret_from_sys_call(void);
asmlinkage int sys_pipe(unsigned long * fildes)
{
int fd[2];
int error;
error = verify_area(VERIFY_WRITE,fildes,8);
if (error)
return error;
error = do_pipe(fd);
if (error)
return error;
put_fs_long(fd[0],0+fildes);
put_fs_long(fd[1],1+fildes);
return 0;
}
asmlinkage int sys_idle(void)
{
if (current->pid != 0)
return -EPERM;
/* endless idle loop with no priority at all */
current->counter = -100;
for (;;) {
/*
* R4[26]00 have wait, R4[04]00 don't.
*/
if (wait_available && !need_resched)
__asm__(".set\tmips3\n\t"
"wait\n\t"
".set\tmips0\n\t");
schedule();
}
}
/*
* This routine reboots the machine by asking the keyboard
* controller to pulse the reset-line low. We try that for a while,
* and if it doesn't work, we do some other stupid things.
* Should be ok for Deskstation Tynes. Reseting others needs to be
* investigated...
*/
static inline void kb_wait(void)
{
int i;
for (i=0; i<0x10000; i++)
if ((inb_p(0x64) & 0x02) == 0)
break;
}
/*
* Hard reset for Deskstation Tyne
* No hint how this works on Pica boards.
*/
void hard_reset_now(void)
{
int i, j;
sti();
for (;;) {
for (i=0; i<100; i++) {
kb_wait();
for(j = 0; j < 100000 ; j++)
/* nothing */;
outb(0xfe,0x64); /* pulse reset low */
}
}
}
void show_regs(struct pt_regs * regs)
{
/*
* Saved main processor registers
*/
printk("$0 : %08x %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
0, regs->reg1, regs->reg2, regs->reg3,
regs->reg4, regs->reg5, regs->reg6, regs->reg7);
printk("$8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
regs->reg8, regs->reg9, regs->reg10, regs->reg11,
regs->reg12, regs->reg13, regs->reg14, regs->reg15);
printk("$16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
regs->reg16, regs->reg17, regs->reg18, regs->reg19,
regs->reg20, regs->reg21, regs->reg22, regs->reg23);
printk("$24: %08lx %08lx %08lx %08lx %08lx %08lx\n",
regs->reg24, regs->reg25, regs->reg28, regs->reg29,
regs->reg30, regs->reg31);
/*
* Saved cp0 registers
*/
printk("epc : %08lx\nStatus: %08lx\nCause : %08lx\n",
regs->cp0_epc, regs->cp0_status, regs->cp0_cause);
}
/*
* Free current thread data structures etc..
*/
void exit_thread(void)
{
/*
* Nothing to do
*/
}
void flush_thread(void)
{
/*
* Nothing to do
*/
}
void copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
struct task_struct * p, struct pt_regs * regs)
{
struct pt_regs * childregs;
/*
* set up new TSS
*/
childregs = ((struct pt_regs *) (p->kernel_stack_page + PAGE_SIZE)) - 1;
*childregs = *regs;
childregs->reg2 = 0;
regs->reg2 = p->pid;
childregs->reg29 = usp;
p->tss.ksp = (p->kernel_stack_page + PAGE_SIZE - 8);
p->tss.reg29 = (unsigned long) childregs; /* new sp */
p->tss.reg31 = (unsigned long) ret_from_sys_call;
/*
* New tasks loose permission to use the fpu. This accelerates context
* switching for most programs since they don't use the fpu.
*/
p->tss.cp0_status = read_32bit_cp0_register(CP0_STATUS) &
~(ST0_CU3|ST0_CU2|ST0_CU1|ST0_KSU|ST0_ERL|ST0_EXL);
childregs->cp0_status &= ~(ST0_CU3|ST0_CU2|ST0_CU1);
}
/*
* fill in the user structure for a core dump..
*/
void dump_thread(struct pt_regs * regs, struct user * dump)
{
/*
* To do...
*/
}
asmlinkage int sys_fork(struct pt_regs regs)
{
return do_fork(COPYVM | SIGCHLD, regs.reg29, ®s);
}
asmlinkage int sys_clone(struct pt_regs regs)
{
unsigned long clone_flags;
unsigned long newsp;
newsp = regs.reg4;
clone_flags = regs.reg5;
if (!newsp)
newsp = regs.reg29;
if (newsp == regs.reg29)
clone_flags |= COPYVM;
return do_fork(clone_flags, newsp, ®s);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(struct pt_regs regs)
{
int error;
char * filename;
error = getname((char *) regs.reg4, &filename);
if (error)
return error;
error = do_execve(filename, (char **) regs.reg5, (char **) regs.reg6, ®s);
putname(filename);
return error;
}
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