145 lines
4.5 KiB
C
145 lines
4.5 KiB
C
/*
|
|
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2008-2009 PetaLogix
|
|
* Copyright (C) 2006 Atmark Techno, Inc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/cpu.h>
|
|
#include <linux/export.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/sched/task.h>
|
|
#include <linux/sched/task_stack.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/tick.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/ptrace.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
void show_regs(struct pt_regs *regs)
|
|
{
|
|
show_regs_print_info(KERN_INFO);
|
|
|
|
pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode);
|
|
pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
|
|
regs->r1, regs->r2, regs->r3, regs->r4);
|
|
pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
|
|
regs->r5, regs->r6, regs->r7, regs->r8);
|
|
pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
|
|
regs->r9, regs->r10, regs->r11, regs->r12);
|
|
pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
|
|
regs->r13, regs->r14, regs->r15, regs->r16);
|
|
pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
|
|
regs->r17, regs->r18, regs->r19, regs->r20);
|
|
pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
|
|
regs->r21, regs->r22, regs->r23, regs->r24);
|
|
pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
|
|
regs->r25, regs->r26, regs->r27, regs->r28);
|
|
pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
|
|
regs->r29, regs->r30, regs->r31, regs->pc);
|
|
pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
|
|
regs->msr, regs->ear, regs->esr, regs->fsr);
|
|
}
|
|
|
|
void (*pm_power_off)(void) = NULL;
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
void flush_thread(void)
|
|
{
|
|
}
|
|
|
|
int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
|
|
{
|
|
unsigned long clone_flags = args->flags;
|
|
unsigned long usp = args->stack;
|
|
unsigned long tls = args->tls;
|
|
struct pt_regs *childregs = task_pt_regs(p);
|
|
struct thread_info *ti = task_thread_info(p);
|
|
|
|
if (unlikely(args->fn)) {
|
|
/* if we're creating a new kernel thread then just zeroing all
|
|
* the registers. That's OK for a brand new thread.*/
|
|
memset(childregs, 0, sizeof(struct pt_regs));
|
|
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
|
|
ti->cpu_context.r1 = (unsigned long)childregs;
|
|
ti->cpu_context.r20 = (unsigned long)args->fn;
|
|
ti->cpu_context.r19 = (unsigned long)args->fn_arg;
|
|
childregs->pt_mode = 1;
|
|
local_save_flags(childregs->msr);
|
|
ti->cpu_context.msr = childregs->msr & ~MSR_IE;
|
|
ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
|
|
return 0;
|
|
}
|
|
*childregs = *current_pt_regs();
|
|
if (usp)
|
|
childregs->r1 = usp;
|
|
|
|
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
|
|
ti->cpu_context.r1 = (unsigned long)childregs;
|
|
childregs->msr |= MSR_UMS;
|
|
|
|
/* we should consider the fact that childregs is a copy of the parent
|
|
* regs which were saved immediately after entering the kernel state
|
|
* before enabling VM. This MSR will be restored in switch_to and
|
|
* RETURN() and we want to have the right machine state there
|
|
* specifically this state must have INTs disabled before and enabled
|
|
* after performing rtbd
|
|
* compose the right MSR for RETURN(). It will work for switch_to also
|
|
* excepting for VM and UMS
|
|
* don't touch UMS , CARRY and cache bits
|
|
* right now MSR is a copy of parent one */
|
|
childregs->msr &= ~MSR_EIP;
|
|
childregs->msr |= MSR_IE;
|
|
childregs->msr &= ~MSR_VM;
|
|
childregs->msr |= MSR_VMS;
|
|
childregs->msr |= MSR_EE; /* exceptions will be enabled*/
|
|
|
|
ti->cpu_context.msr = (childregs->msr|MSR_VM);
|
|
ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */
|
|
ti->cpu_context.msr &= ~MSR_IE;
|
|
ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
|
|
|
|
/*
|
|
* r21 is the thread reg, r10 is 6th arg to clone
|
|
* which contains TLS area
|
|
*/
|
|
if (clone_flags & CLONE_SETTLS)
|
|
childregs->r21 = tls;
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long __get_wchan(struct task_struct *p)
|
|
{
|
|
/* TBD (used by procfs) */
|
|
return 0;
|
|
}
|
|
|
|
/* Set up a thread for executing a new program */
|
|
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
|
|
{
|
|
regs->pc = pc;
|
|
regs->r1 = usp;
|
|
regs->pt_mode = 0;
|
|
regs->msr |= MSR_UMS;
|
|
regs->msr &= ~MSR_VM;
|
|
}
|
|
|
|
#include <linux/elfcore.h>
|
|
/*
|
|
* Set up a thread for executing a new program
|
|
*/
|
|
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
|
|
{
|
|
return 0; /* MicroBlaze has no separate FPU registers */
|
|
}
|
|
|
|
void arch_cpu_idle(void)
|
|
{
|
|
raw_local_irq_enable();
|
|
}
|