2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2008-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
11 #include <linux/module.h>
12 #include <linux/sched.h>
14 #include <linux/tick.h>
15 #include <linux/bitops.h>
16 #include <linux/ptrace.h>
17 #include <asm/pgalloc.h>
18 #include <asm/uaccess.h> /* for USER_DS macros */
19 #include <asm/cacheflush.h>
21 void show_regs(struct pt_regs *regs)
23 printk(KERN_INFO " Registers dump: mode=%X\r\n", regs->pt_mode);
24 printk(KERN_INFO " r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
25 regs->r1, regs->r2, regs->r3, regs->r4);
26 printk(KERN_INFO " r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
27 regs->r5, regs->r6, regs->r7, regs->r8);
28 printk(KERN_INFO " r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
29 regs->r9, regs->r10, regs->r11, regs->r12);
30 printk(KERN_INFO " r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
31 regs->r13, regs->r14, regs->r15, regs->r16);
32 printk(KERN_INFO " r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
33 regs->r17, regs->r18, regs->r19, regs->r20);
34 printk(KERN_INFO " r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
35 regs->r21, regs->r22, regs->r23, regs->r24);
36 printk(KERN_INFO " r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
37 regs->r25, regs->r26, regs->r27, regs->r28);
38 printk(KERN_INFO " r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
39 regs->r29, regs->r30, regs->r31, regs->pc);
40 printk(KERN_INFO " msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
41 regs->msr, regs->ear, regs->esr, regs->fsr);
44 void (*pm_power_off)(void) = NULL;
45 EXPORT_SYMBOL(pm_power_off);
47 static int hlt_counter = 1;
49 void disable_hlt(void)
53 EXPORT_SYMBOL(disable_hlt);
59 EXPORT_SYMBOL(enable_hlt);
61 static int __init nohlt_setup(char *__unused)
66 __setup("nohlt", nohlt_setup);
68 static int __init hlt_setup(char *__unused)
73 __setup("hlt", hlt_setup);
75 void default_idle(void)
77 if (likely(hlt_counter)) {
79 stop_critical_timings();
81 start_critical_timings();
84 clear_thread_flag(TIF_POLLING_NRFLAG);
85 smp_mb__after_clear_bit();
87 while (!need_resched())
90 set_thread_flag(TIF_POLLING_NRFLAG);
96 set_thread_flag(TIF_POLLING_NRFLAG);
98 /* endless idle loop with no priority at all */
103 tick_nohz_idle_enter();
105 while (!need_resched())
108 tick_nohz_idle_exit();
110 schedule_preempt_disabled();
115 void flush_thread(void)
119 int copy_thread(unsigned long clone_flags, unsigned long usp,
120 unsigned long arg, struct task_struct *p)
122 struct pt_regs *childregs = task_pt_regs(p);
123 struct thread_info *ti = task_thread_info(p);
125 if (unlikely(p->flags & PF_KTHREAD)) {
126 /* if we're creating a new kernel thread then just zeroing all
127 * the registers. That's OK for a brand new thread.*/
128 memset(childregs, 0, sizeof(struct pt_regs));
129 memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
130 ti->cpu_context.r1 = (unsigned long)childregs;
131 ti->cpu_context.r20 = (unsigned long)usp; /* fn */
132 ti->cpu_context.r19 = (unsigned long)arg;
133 childregs->pt_mode = 1;
134 local_save_flags(childregs->msr);
136 ti->cpu_context.msr = childregs->msr & ~MSR_IE;
138 ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
141 *childregs = *current_pt_regs();
145 memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
146 ti->cpu_context.r1 = (unsigned long)childregs;
148 ti->cpu_context.msr = (unsigned long)childregs->msr;
150 childregs->msr |= MSR_UMS;
152 /* we should consider the fact that childregs is a copy of the parent
153 * regs which were saved immediately after entering the kernel state
154 * before enabling VM. This MSR will be restored in switch_to and
155 * RETURN() and we want to have the right machine state there
156 * specifically this state must have INTs disabled before and enabled
157 * after performing rtbd
158 * compose the right MSR for RETURN(). It will work for switch_to also
159 * excepting for VM and UMS
160 * don't touch UMS , CARRY and cache bits
161 * right now MSR is a copy of parent one */
162 childregs->msr &= ~MSR_EIP;
163 childregs->msr |= MSR_IE;
164 childregs->msr &= ~MSR_VM;
165 childregs->msr |= MSR_VMS;
166 childregs->msr |= MSR_EE; /* exceptions will be enabled*/
168 ti->cpu_context.msr = (childregs->msr|MSR_VM);
169 ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */
170 ti->cpu_context.msr &= ~MSR_IE;
172 ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
175 * r21 is the thread reg, r10 is 6th arg to clone
176 * which contains TLS area
178 if (clone_flags & CLONE_SETTLS)
179 childregs->r21 = childregs->r10;
186 * Return saved PC of a blocked thread.
188 unsigned long thread_saved_pc(struct task_struct *tsk)
190 struct cpu_context *ctx =
191 &(((struct thread_info *)(tsk->stack))->cpu_context);
193 /* Check whether the thread is blocked in resume() */
194 if (in_sched_functions(ctx->r15))
195 return (unsigned long)ctx->r15;
201 unsigned long get_wchan(struct task_struct *p)
203 /* TBD (used by procfs) */
207 /* Set up a thread for executing a new program */
208 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
214 regs->msr |= MSR_UMS;
215 regs->msr &= ~MSR_VM;
220 #include <linux/elfcore.h>
222 * Set up a thread for executing a new program
224 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
226 return 0; /* MicroBlaze has no separate FPU registers */
228 #endif /* CONFIG_MMU */