Blackfin: bf54x: drop unused legacy MMR names
[linux-2.6.git] / arch / blackfin / kernel / entry.S
1 /*
2  * Copyright 2004-2009 Analog Devices Inc.
3  *
4  * Licensed under the GPL-2 or later
5  */
6
7 #include <linux/linkage.h>
8 #include <asm/thread_info.h>
9 #include <asm/errno.h>
10 #include <asm/blackfin.h>
11 #include <asm/asm-offsets.h>
12
13 #include <asm/context.S>
14
15 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
16 .section .l1.text
17 #else
18 .text
19 #endif
20
21 ENTRY(_ret_from_fork)
22 #ifdef CONFIG_IPIPE
23         /*
24          * Hw IRQs are off on entry, and we don't want the scheduling tail
25          * code to starve high priority domains from interrupts while it
26          * runs. Therefore we first stall the root stage to have the
27          * virtual interrupt state reflect IMASK.
28          */
29         p0.l = ___ipipe_root_status;
30         p0.h = ___ipipe_root_status;
31         r4 = [p0];
32         bitset(r4, 0);
33         [p0] = r4;
34         /*
35          * Then we may enable hw IRQs, allowing preemption from high
36          * priority domains. schedule_tail() will do local_irq_enable()
37          * since Blackfin does not define __ARCH_WANT_UNLOCKED_CTXSW, so
38          * there is no need to unstall the root domain by ourselves
39          * afterwards.
40          */
41         p0.l = _bfin_irq_flags;
42         p0.h = _bfin_irq_flags;
43         r4 = [p0];
44         sti r4;
45 #endif /* CONFIG_IPIPE */
46         SP += -12;
47         pseudo_long_call _schedule_tail, p5;
48         SP += 12;
49         r0 = [sp + PT_IPEND];
50         cc = bittst(r0,1);
51         if cc jump .Lin_kernel;
52         RESTORE_CONTEXT
53         rti;
54 .Lin_kernel:
55         bitclr(r0,1);
56         [sp + PT_IPEND] = r0;
57         /* do a 'fake' RTI by jumping to [RETI]
58          * to avoid clearing supervisor mode in child
59          */
60         r0 = [sp + PT_PC];
61         [sp + PT_P0] = r0;
62
63         RESTORE_ALL_SYS
64         jump (p0);
65 ENDPROC(_ret_from_fork)
66
67 ENTRY(_sys_fork)
68         r0 = -EINVAL;
69 #if (ANOMALY_05000371)
70         nop;
71         nop;
72         nop;
73 #endif
74         rts;
75 ENDPROC(_sys_fork)
76
77 ENTRY(_sys_vfork)
78         r0 = sp;
79         r0 += 24;
80         [--sp] = rets;
81         SP += -12;
82         pseudo_long_call _bfin_vfork, p2;
83         SP += 12;
84         rets = [sp++];
85         rts;
86 ENDPROC(_sys_vfork)
87
88 ENTRY(_sys_clone)
89         r0 = sp;
90         r0 += 24;
91         [--sp] = rets;
92         SP += -12;
93         pseudo_long_call _bfin_clone, p2;
94         SP += 12;
95         rets = [sp++];
96         rts;
97 ENDPROC(_sys_clone)
98
99 ENTRY(_sys_rt_sigreturn)
100         r0 = sp;
101         r0 += 24;
102         [--sp] = rets;
103         SP += -12;
104         pseudo_long_call _do_rt_sigreturn, p2;
105         SP += 12;
106         rets = [sp++];
107         rts;
108 ENDPROC(_sys_rt_sigreturn)