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authorMichal Simek <monstr@monstr.eu>2009-03-27 09:25:26 -0400
committerMichal Simek <monstr@monstr.eu>2009-03-27 09:25:26 -0400
commit6496a23add642b7c9203411bdff3ff761835a80a (patch)
treeb0a536aa55cfdebcbf111120be19db3306e9a690 /arch/microblaze
parentc47f10baa0bd7e3de6b7072cfdcafef58f4147f5 (diff)
microblaze_v8: process and init task function
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/kernel/init_task.c29
-rw-r--r--arch/microblaze/kernel/process.c187
2 files changed, 216 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/init_task.c b/arch/microblaze/kernel/init_task.c
new file mode 100644
index 000000000000..48eb9fb255fa
--- /dev/null
+++ b/arch/microblaze/kernel/init_task.c
@@ -0,0 +1,29 @@
1/*
2 * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
5 *
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
8 * for more details.
9 */
10
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/init_task.h>
14#include <linux/fs.h>
15#include <linux/mqueue.h>
16
17#include <asm/pgtable.h>
18
19static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
20static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
21struct mm_struct init_mm = INIT_MM(init_mm);
22EXPORT_SYMBOL(init_mm);
23
24union thread_union init_thread_union
25 __attribute__((__section__(".data.init_task"))) =
26{ INIT_THREAD_INFO(init_task) };
27
28struct task_struct init_task = INIT_TASK(init_task);
29EXPORT_SYMBOL(init_task);
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
new file mode 100644
index 000000000000..60e9ed7d3132
--- /dev/null
+++ b/arch/microblaze/kernel/process.c
@@ -0,0 +1,187 @@
1/*
2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2008-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
5 *
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
8 * for more details.
9 */
10
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/pm.h>
14#include <linux/tick.h>
15#include <linux/bitops.h>
16#include <asm/system.h>
17#include <asm/pgalloc.h>
18
19void show_regs(struct pt_regs *regs)
20{
21 printk(KERN_INFO " Registers dump: mode=%X\r\n", regs->kernel_mode);
22 printk(KERN_INFO " r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
23 regs->r1, regs->r2, regs->r3, regs->r4);
24 printk(KERN_INFO " r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
25 regs->r5, regs->r6, regs->r7, regs->r8);
26 printk(KERN_INFO " r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
27 regs->r9, regs->r10, regs->r11, regs->r12);
28 printk(KERN_INFO " r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
29 regs->r13, regs->r14, regs->r15, regs->r16);
30 printk(KERN_INFO " r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
31 regs->r17, regs->r18, regs->r19, regs->r20);
32 printk(KERN_INFO " r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
33 regs->r21, regs->r22, regs->r23, regs->r24);
34 printk(KERN_INFO " r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
35 regs->r25, regs->r26, regs->r27, regs->r28);
36 printk(KERN_INFO " r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
37 regs->r29, regs->r30, regs->r31, regs->pc);
38 printk(KERN_INFO " msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
39 regs->msr, regs->ear, regs->esr, regs->fsr);
40 while (1)
41 ;
42}
43
44void (*pm_idle)(void);
45void (*pm_power_off)(void) = NULL;
46EXPORT_SYMBOL(pm_power_off);
47
48static int hlt_counter = 1;
49
50void disable_hlt(void)
51{
52 hlt_counter++;
53}
54EXPORT_SYMBOL(disable_hlt);
55
56void enable_hlt(void)
57{
58 hlt_counter--;
59}
60EXPORT_SYMBOL(enable_hlt);
61
62static int __init nohlt_setup(char *__unused)
63{
64 hlt_counter = 1;
65 return 1;
66}
67__setup("nohlt", nohlt_setup);
68
69static int __init hlt_setup(char *__unused)
70{
71 hlt_counter = 0;
72 return 1;
73}
74__setup("hlt", hlt_setup);
75
76void default_idle(void)
77{
78 if (!hlt_counter) {
79 clear_thread_flag(TIF_POLLING_NRFLAG);
80 smp_mb__after_clear_bit();
81 local_irq_disable();
82 while (!need_resched())
83 cpu_sleep();
84 local_irq_enable();
85 set_thread_flag(TIF_POLLING_NRFLAG);
86 } else
87 while (!need_resched())
88 cpu_relax();
89}
90
91void cpu_idle(void)
92{
93 set_thread_flag(TIF_POLLING_NRFLAG);
94
95 /* endless idle loop with no priority at all */
96 while (1) {
97 void (*idle)(void) = pm_idle;
98
99 if (!idle)
100 idle = default_idle;
101
102 tick_nohz_stop_sched_tick(1);
103 while (!need_resched())
104 idle();
105 tick_nohz_restart_sched_tick();
106
107 preempt_enable_no_resched();
108 schedule();
109 preempt_disable();
110 check_pgt_cache();
111 }
112}
113
114void flush_thread(void)
115{
116}
117
118/* FIXME - here will be a proposed change -> remove nr parameter */
119int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
120 unsigned long unused,
121 struct task_struct *p, struct pt_regs *regs)
122{
123 struct pt_regs *childregs = task_pt_regs(p);
124 struct thread_info *ti = task_thread_info(p);
125
126 *childregs = *regs;
127 if (user_mode(regs))
128 childregs->r1 = usp;
129 else
130 childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
131
132 memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
133 ti->cpu_context.r1 = (unsigned long)childregs;
134 ti->cpu_context.msr = (unsigned long)childregs->msr;
135 ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
136
137 if (clone_flags & CLONE_SETTLS)
138 ;
139
140 return 0;
141}
142
143/*
144 * Return saved PC of a blocked thread.
145 */
146unsigned long thread_saved_pc(struct task_struct *tsk)
147{
148 struct cpu_context *ctx =
149 &(((struct thread_info *)(tsk->stack))->cpu_context);
150
151 /* Check whether the thread is blocked in resume() */
152 if (in_sched_functions(ctx->r15))
153 return (unsigned long)ctx->r15;
154 else
155 return ctx->r14;
156}
157
158static void kernel_thread_helper(int (*fn)(void *), void *arg)
159{
160 fn(arg);
161 do_exit(-1);
162}
163
164int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
165{
166 struct pt_regs regs;
167 int ret;
168
169 memset(&regs, 0, sizeof(regs));
170 /* store them in non-volatile registers */
171 regs.r5 = (unsigned long)fn;
172 regs.r6 = (unsigned long)arg;
173 local_save_flags(regs.msr);
174 regs.pc = (unsigned long)kernel_thread_helper;
175 regs.kernel_mode = 1;
176
177 ret = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
178 &regs, 0, NULL, NULL);
179
180 return ret;
181}
182
183unsigned long get_wchan(struct task_struct *p)
184{
185/* TBD (used by procfs) */
186 return 0;
187}