summaryrefslogtreecommitdiff
path: root/arch/c6x/kernel/process.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/c6x/kernel/process.c')
-rw-r--r--arch/c6x/kernel/process.c151
1 files changed, 0 insertions, 151 deletions
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
deleted file mode 100644
index 9f4fd6a40a10..000000000000
--- a/arch/c6x/kernel/process.c
+++ /dev/null
@@ -1,151 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Port on Texas Instruments TMS320C6x architecture
- *
- * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
- * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
- */
-#include <linux/module.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.h>
-#include <linux/init_task.h>
-#include <linux/tick.h>
-#include <linux/mqueue.h>
-#include <linux/syscalls.h>
-#include <linux/reboot.h>
-#include <linux/sched/task.h>
-#include <linux/sched/task_stack.h>
-
-#include <asm/syscalls.h>
-
-/* hooks for board specific support */
-void (*c6x_restart)(void);
-void (*c6x_halt)(void);
-
-extern asmlinkage void ret_from_fork(void);
-extern asmlinkage void ret_from_kernel_thread(void);
-
-/*
- * power off function, if any
- */
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
-void arch_cpu_idle(void)
-{
- unsigned long tmp;
-
- /*
- * Put local_irq_enable and idle in same execute packet
- * to make them atomic and avoid race to idle with
- * interrupts enabled.
- */
- asm volatile (" mvc .s2 CSR,%0\n"
- " or .d2 1,%0,%0\n"
- " mvc .s2 %0,CSR\n"
- "|| idle\n"
- : "=b"(tmp));
-}
-
-static void halt_loop(void)
-{
- printk(KERN_EMERG "System Halted, OK to turn off power\n");
- local_irq_disable();
- while (1)
- asm volatile("idle\n");
-}
-
-void machine_restart(char *__unused)
-{
- if (c6x_restart)
- c6x_restart();
- halt_loop();
-}
-
-void machine_halt(void)
-{
- if (c6x_halt)
- c6x_halt();
- halt_loop();
-}
-
-void machine_power_off(void)
-{
- if (pm_power_off)
- pm_power_off();
- halt_loop();
-}
-
-void flush_thread(void)
-{
-}
-
-/*
- * Do necessary setup to start up a newly executed thread.
- */
-void start_thread(struct pt_regs *regs, unsigned int pc, unsigned long usp)
-{
- /*
- * The binfmt loader will setup a "full" stack, but the C6X
- * operates an "empty" stack. So we adjust the usp so that
- * argc doesn't get destroyed if an interrupt is taken before
- * it is read from the stack.
- *
- * NB: Library startup code needs to match this.
- */
- usp -= 8;
-
- regs->pc = pc;
- regs->sp = usp;
- regs->tsr |= 0x40; /* set user mode */
- current->thread.usp = usp;
-}
-
-/*
- * Copy a new thread context in its stack.
- */
-int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long ustk_size, struct task_struct *p,
- unsigned long tls)
-{
- struct pt_regs *childregs;
-
- childregs = task_pt_regs(p);
-
- if (unlikely(p->flags & PF_KTHREAD)) {
- /* case of __kernel_thread: we return to supervisor space */
- memset(childregs, 0, sizeof(struct pt_regs));
- childregs->sp = (unsigned long)(childregs + 1);
- p->thread.pc = (unsigned long) ret_from_kernel_thread;
- childregs->a0 = usp; /* function */
- childregs->a1 = ustk_size; /* argument */
- } else {
- /* Otherwise use the given stack */
- *childregs = *current_pt_regs();
- if (usp)
- childregs->sp = usp;
- p->thread.pc = (unsigned long) ret_from_fork;
- }
-
- /* Set usp/ksp */
- p->thread.usp = childregs->sp;
- thread_saved_ksp(p) = (unsigned long)childregs - 8;
- p->thread.wchan = p->thread.pc;
-#ifdef __DSBT__
- {
- unsigned long dp;
-
- asm volatile ("mv .S2 b14,%0\n" : "=b"(dp));
-
- thread_saved_dp(p) = dp;
- if (usp == -1)
- childregs->dp = dp;
- }
-#endif
- return 0;
-}
-
-unsigned long get_wchan(struct task_struct *p)
-{
- return p->thread.wchan;
-}