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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Copyright 2003 PathScale, Inc.
*/
#include <linux/stddef.h>
#include <linux/err.h>
#include <linux/hardirq.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/personality.h>
#include <linux/proc_fs.h>
#include <linux/ptrace.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/seq_file.h>
#include <linux/tick.h>
#include <linux/threads.h>
#include <linux/tracehook.h>
#include <asm/current.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <linux/uaccess.h>
#include <as-layout.h>
#include <kern_util.h>
#include <os.h>
#include <skas.h>
#include <timer-internal.h>
/*
* This is a per-cpu array. A processor only modifies its entry and it only
* cares about its entry, so it's OK if another processor is modifying its
* entry.
*/
struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
static inline int external_pid(void)
{
/* FIXME: Need to look up userspace_pid by cpu */
return userspace_pid[0];
}
int pid_to_processor_id(int pid)
{
int i;
for (i = 0; i < ncpus; i++) {
if (cpu_tasks[i].pid == pid)
return i;
}
return -1;
}
void free_stack(unsigned long stack, int order)
{
free_pages(stack, order);
}
unsigned long alloc_stack(int order, int atomic)
{
unsigned long page;
gfp_t flags = GFP_KERNEL;
if (atomic)
flags = GFP_ATOMIC;
page = __get_free_pages(flags, order);
return page;
}
static inline void set_current(struct task_struct *task)
{
cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
{ external_pid(), task });
}
extern void arch_switch_to(struct task_struct *to);
void *__switch_to(struct task_struct *from, struct task_struct *to)
{
to->thread.prev_sched = from;
set_current(to);
switch_threads(&from->thread.switch_buf, &to->thread.switch_buf);
arch_switch_to(current);
return current->thread.prev_sched;
}
void interrupt_end(void)
{
struct pt_regs *regs = ¤t->thread.regs;
if (need_resched())
schedule();
if (test_thread_flag(TIF_SIGPENDING))
do_signal(regs);
if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
tracehook_notify_resume(regs);
}
int get_current_pid(void)
{
return task_pid_nr(current);
}
/*
* This is called magically, by its address being stuffed in a jmp_buf
* and being longjmp-d to.
*/
void new_thread_handler(void)
{
int (*fn)(void *), n;
void *arg;
if (current->thread.prev_sched != NULL)
schedule_tail(current->thread.prev_sched);
current->thread.prev_sched = NULL;
fn = current->thread.request.u.thread.proc;
arg = current->thread.request.u.thread.arg;
/*
* callback returns only if the kernel thread execs a process
*/
n = fn(arg);
userspace(¤t->thread.regs.regs, current_thread_info()->aux_fp_regs);
}
/* Called magically, see new_thread_handler above */
void fork_handler(void)
{
force_flush_all();
schedule_tail(current->thread.prev_sched);
/*
* XXX: if interrupt_end() calls schedule, this call to
* arch_switch_to isn't needed. We could want to apply this to
* improve performance. -bb
*/
arch_switch_to(current);
current->thread.prev_sched = NULL;
userspace(¤t->thread.regs.regs, current_thread_info()->aux_fp_regs);
}
int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
unsigned long arg, struct task_struct * p, unsigned long tls)
{
void (*handler)(void);
int kthread = current->flags & PF_KTHREAD;
int ret = 0;
p->thread = (struct thread_struct) INIT_THREAD;
if (!kthread) {
memcpy(&p->thread.regs.regs, current_pt_regs(),
sizeof(p->thread.regs.regs));
PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
if (sp != 0)
REGS_SP(p->thread.regs.regs.gp) = sp;
handler = fork_handler;
arch_copy_thread(¤t->thread.arch, &p->thread.arch);
} else {
get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
p->thread.request.u.thread.proc = (int (*)(void *))sp;
p->thread.request.u.thread.arg = (void *)arg;
handler = new_thread_handler;
}
new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
if (!kthread) {
clear_flushed_tls(p);
/*
* Set a new TLS for the child thread?
*/
if (clone_flags & CLONE_SETTLS)
ret = arch_set_tls(p, tls);
}
return ret;
}
void initial_thread_cb(void (*proc)(void *), void *arg)
{
int save_kmalloc_ok = kmalloc_ok;
kmalloc_ok = 0;
initial_thread_cb_skas(proc, arg);
kmalloc_ok = save_kmalloc_ok;
}
static void time_travel_sleep(unsigned long long duration)
{
unsigned long long next = time_travel_time + duration;
if (time_travel_mode != TT_MODE_INFCPU)
os_timer_disable();
while (time_travel_timer_mode == TT_TMR_PERIODIC &&
time_travel_timer_expiry < time_travel_time)
time_travel_set_timer_expiry(time_travel_timer_expiry +
time_travel_timer_interval);
if (time_travel_timer_mode != TT_TMR_DISABLED &&
time_travel_timer_expiry < next) {
if (time_travel_timer_mode == TT_TMR_ONESHOT)
time_travel_set_timer_mode(TT_TMR_DISABLED);
/*
* In basic mode, time_travel_time will be adjusted in
* the timer IRQ handler so it works even when the signal
* comes from the OS timer, see there.
*/
if (time_travel_mode != TT_MODE_BASIC)
time_travel_set_time(time_travel_timer_expiry);
deliver_alarm();
} else {
time_travel_set_time(next);
}
if (time_travel_mode != TT_MODE_INFCPU) {
if (time_travel_timer_mode == TT_TMR_PERIODIC)
os_timer_set_interval(time_travel_timer_interval);
else if (time_travel_timer_mode == TT_TMR_ONESHOT)
os_timer_one_shot(time_travel_timer_expiry - next);
}
}
static void um_idle_sleep(void)
{
unsigned long long duration = UM_NSEC_PER_SEC;
if (time_travel_mode != TT_MODE_OFF) {
time_travel_sleep(duration);
} else {
os_idle_sleep(duration);
}
}
void arch_cpu_idle(void)
{
cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
um_idle_sleep();
local_irq_enable();
}
int __cant_sleep(void) {
return in_atomic() || irqs_disabled() || in_interrupt();
/* Is in_interrupt() really needed? */
}
int user_context(unsigned long sp)
{
unsigned long stack;
stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
return stack != (unsigned long) current_thread_info();
}
extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
void do_uml_exitcalls(void)
{
exitcall_t *call;
call = &__uml_exitcall_end;
while (--call >= &__uml_exitcall_begin)
(*call)();
}
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