1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
* linux/arch/arm/kernel/process.c
*
* Copyright (C) 1996 Russell King - Converted to ARM.
* Origional Copyright (C) 1995 Linus Torvalds
*/
/*
* This file handles the architecture-dependent parts of process handling..
*/
#define __KERNEL_SYSCALLS__
#include <stdarg.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/vmalloc.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/interrupt.h>
#include <linux/config.h>
#include <linux/unistd.h>
#include <linux/delay.h>
#include <linux/smp.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/io.h>
extern char *processor_modes[];
asmlinkage void ret_from_sys_call(void) __asm__("ret_from_sys_call");
static int hlt_counter=0;
void disable_hlt(void)
{
hlt_counter++;
}
void enable_hlt(void)
{
hlt_counter--;
}
/*
* The idle loop on an arm..
*/
asmlinkage int sys_idle(void)
{
int ret = -EPERM;
lock_kernel();
if (current->pid != 0)
goto out;
/* endless idle loop with no priority at all */
current->priority = -100;
for (;;)
{
check_pgt_cache();
#if 0 //def ARCH_IDLE_OK
if (!hlt_counter && !current->need_resched)
proc_idle ();
#endif
run_task_queue(&tq_scheduler);
schedule();
}
ret = 0;
out:
unlock_kernel();
return ret;
}
__initfunc(void reboot_setup(char *str, int *ints))
{
}
/*
* This routine reboots the machine by resetting the expansion cards via
* their loaders, turning off the processor cache (if ARM3), copying the
* first instruction of the ROM to 0, and executing it there.
*/
void machine_restart(char * __unused)
{
proc_hard_reset ();
arch_hard_reset ();
}
void machine_halt(void)
{
}
void machine_power_off(void)
{
}
void show_regs(struct pt_regs * regs)
{
unsigned long flags;
flags = condition_codes(regs);
printk( "pc : [<%08lx>] lr : [<%08lx>]\n"
"sp : %08lx ip : %08lx fp : %08lx\n",
instruction_pointer(regs),
regs->ARM_lr, regs->ARM_sp,
regs->ARM_ip, regs->ARM_fp);
printk( "r10: %08lx r9 : %08lx r8 : %08lx\n",
regs->ARM_r10, regs->ARM_r9,
regs->ARM_r8);
printk( "r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
regs->ARM_r7, regs->ARM_r6,
regs->ARM_r5, regs->ARM_r4);
printk( "r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
regs->ARM_r3, regs->ARM_r2,
regs->ARM_r1, regs->ARM_r0);
printk("Flags: %c%c%c%c",
flags & CC_N_BIT ? 'N' : 'n',
flags & CC_Z_BIT ? 'Z' : 'z',
flags & CC_C_BIT ? 'C' : 'c',
flags & CC_V_BIT ? 'V' : 'v');
printk(" IRQs %s FIQs %s Mode %s Segment %s\n",
interrupts_enabled(regs) ? "on" : "off",
fast_interrupts_enabled(regs) ? "on" : "off",
processor_modes[processor_mode(regs)],
get_fs() == get_ds() ? "kernel" : "user");
#if defined(CONFIG_CPU_32)
{
int ctrl, transbase, dac;
__asm__ (
" mrc p15, 0, %0, c1, c0\n"
" mrc p15, 0, %1, c2, c0\n"
" mrc p15, 0, %2, c3, c0\n"
: "=r" (ctrl), "=r" (transbase), "=r" (dac));
printk("Control: %04X Table: %08X DAC: %08X\n",
ctrl, transbase, dac);
}
#endif
}
/*
* Free current thread data structures etc..
*/
void exit_thread(void)
{
}
void flush_thread(void)
{
int i;
for (i = 0; i < NR_DEBUGS; i++)
current->tss.debug[i] = 0;
current->used_math = 0;
current->flags &= ~PF_USEDFPU;
}
void release_thread(struct task_struct *dead_task)
{
}
int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
struct task_struct * p, struct pt_regs * regs)
{
struct pt_regs * childregs;
struct context_save_struct * save;
childregs = ((struct pt_regs *)((unsigned long)p + 8192)) - 1;
*childregs = *regs;
childregs->ARM_r0 = 0;
save = ((struct context_save_struct *)(childregs)) - 1;
copy_thread_css(save);
p->tss.save = save;
return 0;
}
/*
* fill in the fpe structure for a core dump...
*/
int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
{
int fpvalid = 0;
if (current->used_math)
memcpy (fp, ¤t->tss.fpstate.soft, sizeof (fp));
return fpvalid;
}
/*
* fill in the user structure for a core dump..
*/
void dump_thread(struct pt_regs * regs, struct user * dump)
{
int i;
dump->magic = CMAGIC;
dump->start_code = current->mm->start_code;
dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1);
dump->u_tsize = (current->mm->end_code - current->mm->start_code) >> PAGE_SHIFT;
dump->u_dsize = (current->mm->brk - current->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT;
dump->u_ssize = 0;
for (i = 0; i < NR_DEBUGS; i++)
dump->u_debugreg[i] = current->tss.debug[i];
if (dump->start_stack < 0x04000000)
dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT;
dump->regs = *regs;
dump->u_fpvalid = dump_fpu (regs, &dump->u_fp);
}
|
