static ssize_t hostaudio_write(struct file *file, const char *buffer,
size_t count, loff_t *ppos)
{
struct hostaudio_state *state = file->private_data;
void *kbuf;
int err;
#ifdef DEBUG
printk("hostaudio: write called, count = %d\n", count);
#endif
kbuf = kmalloc(count, GFP_KERNEL);
if(kbuf == NULL)
return(-ENOMEM);
err = -EFAULT;
if(copy_from_user(kbuf, buffer, count))
goto out;
err = os_write_file(state->fd, kbuf, count);
if(err < 0)
goto out;
*ppos += err;
out:
kfree(kbuf);
return(err);
}
void __init setup_physmem(unsigned long start, unsigned long reserve_end,
unsigned long len, unsigned long long highmem)
{
unsigned long reserve = reserve_end - start;
int pfn = PFN_UP(__pa(reserve_end));
int delta = (len - reserve) >> PAGE_SHIFT;
int err, offset, bootmap_size;
physmem_fd = create_mem_file(len + highmem);
offset = uml_reserved - uml_physmem;
err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
len - offset, 1, 1, 1);
if (err < 0) {
printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
"failed - errno = %d\n", len - offset,
(void *) uml_reserved, err);
exit(1);
}
/*
* Special kludge - This page will be mapped in to userspace processes
* from physmem_fd, so it needs to be written out there.
*/
os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
bootmap_size = init_bootmem(pfn, pfn + delta);
free_bootmem(__pa(reserve_end) + bootmap_size,
len - bootmap_size - reserve);
}
static void tracer_winch_handler(int sig)
{
int n;
char c = 1;
n = os_write_file(tracer_winch[1], &c, sizeof(c));
if(n != sizeof(c))
printk("tracer_winch_handler - write failed, err = %d\n", -n);
}
void switch_to_tt(void *prev, void *next)
{
struct task_struct *from, *to, *prev_sched;
unsigned long flags;
int err, vtalrm, alrm, prof, cpu;
char c;
from = prev;
to = next;
cpu = from->thread_info->cpu;
if(cpu == 0)
forward_interrupts(to->thread.mode.tt.extern_pid);
#ifdef CONFIG_SMP
forward_ipi(cpu_data[cpu].ipi_pipe[0], to->thread.mode.tt.extern_pid);
#endif
local_irq_save(flags);
vtalrm = change_sig(SIGVTALRM, 0);
alrm = change_sig(SIGALRM, 0);
prof = change_sig(SIGPROF, 0);
forward_pending_sigio(to->thread.mode.tt.extern_pid);
c = 0;
err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
if(err != sizeof(c))
panic("write of switch_pipe failed, err = %d", -err);
if(from->thread.mode.tt.switch_pipe[0] == -1)
os_kill_process(os_getpid(), 0);
err = os_read_file(from->thread.mode.tt.switch_pipe[0], &c, sizeof(c));
if(err != sizeof(c))
panic("read of switch_pipe failed, errno = %d", -err);
/* If the process that we have just scheduled away from has exited,
* then it needs to be killed here. The reason is that, even though
* it will kill itself when it next runs, that may be too late. Its
* stack will be freed, possibly before then, and if that happens,
* we have a use-after-free situation. So, it gets killed here
* in case it has not already killed itself.
*/
prev_sched = current->thread.prev_sched;
if(prev_sched->thread.mode.tt.switch_pipe[0] == -1)
os_kill_process(prev_sched->thread.mode.tt.extern_pid, 1);
change_sig(SIGVTALRM, vtalrm);
change_sig(SIGALRM, alrm);
change_sig(SIGPROF, prof);
arch_switch();
flush_tlb_all();
local_irq_restore(flags);
}
int net_write(int fd, void *buf, int len)
{
int n;
n = os_write_file(fd, buf, len);
if(n == -EAGAIN)
return(0);
else if(n == 0)
return(-ENOTCONN);
return(n);
}
int net_write(int fd, void *buf, int len)
{
int n;
n = os_write_file(fd, buf, len);
if(n == -EAGAIN)
return 0;
else if(n == 0)
return -ENOTCONN;
return n;
}
void smp_send_stop(void)
{
int i;
printk(KERN_INFO "Stopping all CPUs...");
for (i = 0; i < num_online_cpus(); i++) {
if (i == current_thread->cpu)
continue;
os_write_file(cpu_data[i].ipi_pipe[1], "S", 1);
}
printk(KERN_CONT "done\n");
}
int ping_watchdog(int fd)
{
int n;
char c = '\n';
n = os_write_file(fd, &c, sizeof(c));
if(n != sizeof(c)){
printk("ping_watchdog - write failed, err = %d\n", -n);
if(n < 0)
return n;
return -EIO;
}
return 1;
}
static int helper_child(void *arg)
{
struct helper_data *data = arg;
char **argv = data->argv;
int errval;
if(helper_pause){
signal(SIGHUP, helper_hup);
pause();
}
if(data->pre_exec != NULL)
(*data->pre_exec)(data->pre_data);
execvp(argv[0], argv);
errval = errno;
printk("execvp of '%s' failed - errno = %d\n", argv[0], errno);
os_write_file(data->fd, &errval, sizeof(errval));
os_kill_process(os_getpid(), 0);
return(0);
}
static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
int fd)
{
struct addr_change change;
char *output;
int n;
change.what = op;
memcpy(change.addr, addr, sizeof(change.addr));
memcpy(change.netmask, netmask, sizeof(change.netmask));
n = os_write_file(fd, &change, sizeof(change));
if(n != sizeof(change))
printk("etap_change - request failed, err = %d\n", -n);
output = um_kmalloc(page_size());
if(output == NULL)
printk("etap_change : Failed to allocate output buffer\n");
read_output(fd, output, page_size());
if(output != NULL){
printk("%s", output);
kfree(output);
}
}
static int __init create_pid_file(void)
{
char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
char pid[sizeof("nnnnn\0")];
int fd, n;
if(umid_file_name("pid", file, sizeof(file))) return 0;
fd = os_open_file(file, of_create(of_excl(of_rdwr(OPENFLAGS()))),
0644);
if(fd < 0){
printf("Open of machine pid file \"%s\" failed: %s\n",
file, strerror(-fd));
return 0;
}
sprintf(pid, "%d\n", os_getpid());
n = os_write_file(fd, pid, strlen(pid));
if(n != strlen(pid))
printf("Write of pid file failed - err = %d\n", -n);
os_close_file(fd);
return 0;
}
static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
struct hostaudio_state *state = file->private_data;
void *kbuf;
int err;
#ifdef DEBUG
printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
#endif
kbuf = memdup_user(buffer, count);
if (IS_ERR(kbuf))
return PTR_ERR(kbuf);
err = os_write_file(state->fd, kbuf, count);
if (err < 0)
goto out;
*ppos += err;
out:
kfree(kbuf);
return err;
}
void smp_send_reschedule(int cpu)
{
os_write_file(cpu_data[cpu].ipi_pipe[1], "R", 1);
num_reschedules_sent++;
}
static int connect_to_switch(struct daemon_data *pri)
{
struct sockaddr_un *ctl_addr = pri->ctl_addr;
struct sockaddr_un *local_addr = pri->local_addr;
struct sockaddr_un *sun;
struct request_v3 req;
int fd, n, err;
pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
if(pri->control < 0){
printk("daemon_open : control socket failed, errno = %d\n",
errno);
return(-errno);
}
if(connect(pri->control, (struct sockaddr *) ctl_addr,
sizeof(*ctl_addr)) < 0){
printk("daemon_open : control connect failed, errno = %d\n",
errno);
err = -errno;
goto out;
}
fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if(fd < 0){
printk("daemon_open : data socket failed, errno = %d\n",
errno);
err = -errno;
goto out;
}
if(bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0){
printk("daemon_open : data bind failed, errno = %d\n",
errno);
err = -errno;
goto out_close;
}
sun = um_kmalloc(sizeof(struct sockaddr_un));
if(sun == NULL){
printk("new_addr: allocation of sockaddr_un failed\n");
err = -ENOMEM;
goto out_close;
}
req.magic = SWITCH_MAGIC;
req.version = SWITCH_VERSION;
req.type = REQ_NEW_CONTROL;
req.sock = *local_addr;
n = os_write_file(pri->control, &req, sizeof(req));
if(n != sizeof(req)){
printk("daemon_open : control setup request failed, err = %d\n",
-n);
err = -ENOTCONN;
goto out_free;
}
n = os_read_file(pri->control, sun, sizeof(*sun));
if(n != sizeof(*sun)){
printk("daemon_open : read of data socket failed, err = %d\n",
-n);
err = -ENOTCONN;
goto out_free;
}
pri->data_addr = sun;
return(fd);
out_free:
kfree(sun);
out_close:
os_close_file(fd);
out:
os_close_file(pri->control);
return(err);
}
void switch_to_tt(void *prev, void *next)
{
struct task_struct *from, *to, *prev_sched;
unsigned long flags;
int err, vtalrm, alrm, prof, cpu;
char c;
from = prev;
to = next;
cpu = task_thread_info(from)->cpu;
if(cpu == 0)
forward_interrupts(to->thread.mode.tt.extern_pid);
#ifdef CONFIG_SMP
forward_ipi(cpu_data[cpu].ipi_pipe[0], to->thread.mode.tt.extern_pid);
#endif
local_irq_save(flags);
vtalrm = change_sig(SIGVTALRM, 0);
alrm = change_sig(SIGALRM, 0);
prof = change_sig(SIGPROF, 0);
forward_pending_sigio(to->thread.mode.tt.extern_pid);
c = 0;
/* Notice that here we "up" the semaphore on which "to" is waiting, and
* below (the read) we wait on this semaphore (which is implemented by
* switch_pipe) and go sleeping. Thus, after that, we have resumed in
* "to", and can't use any more the value of "from" (which is outdated),
* nor the value in "to" (since it was the task which stole us the CPU,
* which we don't care about). */
err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
if(err != sizeof(c))
panic("write of switch_pipe failed, err = %d", -err);
if(from->thread.mode.tt.switch_pipe[0] == -1)
os_kill_process(os_getpid(), 0);
err = os_read_file(from->thread.mode.tt.switch_pipe[0], &c, sizeof(c));
if(err != sizeof(c))
panic("read of switch_pipe failed, errno = %d", -err);
/* If the process that we have just scheduled away from has exited,
* then it needs to be killed here. The reason is that, even though
* it will kill itself when it next runs, that may be too late. Its
* stack will be freed, possibly before then, and if that happens,
* we have a use-after-free situation. So, it gets killed here
* in case it has not already killed itself.
*/
prev_sched = current->thread.prev_sched;
if(prev_sched->thread.mode.tt.switch_pipe[0] == -1)
os_kill_process(prev_sched->thread.mode.tt.extern_pid, 1);
change_sig(SIGVTALRM, vtalrm);
change_sig(SIGALRM, alrm);
change_sig(SIGPROF, prof);
arch_switch_to_tt(prev_sched, current);
flush_tlb_all();
local_irq_restore(flags);
}
int generic_write(int fd, const char *buf, int n, void *unused)
{
return os_write_file(fd, buf, n);
}
void *switch_to_tt(void *prev, void *next, void *last)
{
struct task_struct *from, *to, *prev_sched;
unsigned long flags;
int err, vtalrm, alrm, prof, cpu;
char c;
/* jailing and SMP are incompatible, so this doesn't need to be
* made per-cpu
*/
static int reading;
from = prev;
to = next;
to->thread.prev_sched = from;
cpu = from->thread_info->cpu;
if(cpu == 0)
forward_interrupts(to->thread.mode.tt.extern_pid);
#ifdef CONFIG_SMP
forward_ipi(cpu_data[cpu].ipi_pipe[0], to->thread.mode.tt.extern_pid);
#endif
local_irq_save(flags);
vtalrm = change_sig(SIGVTALRM, 0);
alrm = change_sig(SIGALRM, 0);
prof = change_sig(SIGPROF, 0);
forward_pending_sigio(to->thread.mode.tt.extern_pid);
c = 0;
set_current(to);
reading = 0;
err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
if(err != sizeof(c))
panic("write of switch_pipe failed, err = %d", -err);
reading = 1;
if((from->exit_state == EXIT_ZOMBIE) || (from->exit_state == EXIT_DEAD))
os_kill_process(os_getpid(), 0);
err = os_read_file(from->thread.mode.tt.switch_pipe[0], &c, sizeof(c));
if(err != sizeof(c))
panic("read of switch_pipe failed, errno = %d", -err);
/* If the process that we have just scheduled away from has exited,
* then it needs to be killed here. The reason is that, even though
* it will kill itself when it next runs, that may be too late. Its
* stack will be freed, possibly before then, and if that happens,
* we have a use-after-free situation. So, it gets killed here
* in case it has not already killed itself.
*/
prev_sched = current->thread.prev_sched;
if((prev_sched->exit_state == EXIT_ZOMBIE) ||
(prev_sched->exit_state == EXIT_DEAD))
os_kill_ptraced_process(prev_sched->thread.mode.tt.extern_pid, 1);
/* This works around a nasty race with 'jail'. If we are switching
* between two threads of a threaded app and the incoming process
* runs before the outgoing process reaches the read, and it makes
* it all the way out to userspace, then it will have write-protected
* the outgoing process stack. Then, when the outgoing process
* returns from the write, it will segfault because it can no longer
* write its own stack. So, in order to avoid that, the incoming
* thread sits in a loop yielding until 'reading' is set. This
* isn't entirely safe, since there may be a reschedule from a timer
* happening between setting 'reading' and sleeping in read. But,
* it should get a whole quantum in which to reach the read and sleep,
* which should be enough.
*/
if(jail){
while(!reading) sched_yield();
}
change_sig(SIGVTALRM, vtalrm);
change_sig(SIGALRM, alrm);
change_sig(SIGPROF, prof);
arch_switch();
flush_tlb_all();
local_irq_restore(flags);
return(current->thread.prev_sched);
}
}
int new_mm(int from)
{
struct proc_mm_op copy;
int n, fd;
fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
if(fd < 0)
return(fd);
if(from != -1){
copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS,
.u =
{ .copy_segments = from } } );
n = os_write_file(fd, ©, sizeof(copy));
if(n != sizeof(copy))
printk("new_mm : /proc/mm copy_segments failed, "
"err = %d\n", -n);
}
return(fd);
}
void init_idle_skas(void)
{
cpu_tasks[current_thread->cpu].pid = os_getpid();
default_idle();
}
extern void start_kernel(void);
