Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / arch / metag / kernel / head.S
1         ! Copyright 2005,2006,2007,2009 Imagination Technologies
2
3 #include <linux/init.h>
4 #include <asm/metag_mem.h>
5 #include <generated/asm-offsets.h>
6 #undef __exit
7
8         __HEAD
9         ! Setup the stack and get going into _metag_start_kernel
10         .global __start
11         .type   __start,function
12 __start:
13         ! D1Ar1 contains pTBI (ISTAT)
14         ! D0Ar2 contains pTBI
15         ! D1Ar3 contains __pTBISegs
16         ! D0Ar4 contains kernel arglist pointer
17
18         MOVT    D0Re0,#HI(___pTBIs)
19         ADD     D0Re0,D0Re0,#LO(___pTBIs)
20         SETL    [D0Re0],D0Ar2,D1Ar1
21         MOVT    D0Re0,#HI(___pTBISegs)
22         ADD     D0Re0,D0Re0,#LO(___pTBISegs)
23         SETD    [D0Re0],D1Ar3
24         MOV     A0FrP,#0
25         MOV     D0Re0,#0
26         MOV     D1Re0,#0
27         MOV     D1Ar3,#0
28         MOV     D1Ar1,D0Ar4                     !Store kernel boot params
29         MOV     D1Ar5,#0
30         MOV     D0Ar6,#0
31 #ifdef CONFIG_METAG_DSP
32         MOV     D0.8,#0
33 #endif
34         MOVT    A0StP,#HI(_init_thread_union)
35         ADD     A0StP,A0StP,#LO(_init_thread_union)
36         ADD     A0StP,A0StP,#THREAD_INFO_SIZE
37         MOVT    D1RtP,#HI(_metag_start_kernel)
38         CALL    D1RtP,#LO(_metag_start_kernel)
39         .size   __start,.-__start
40
41         !! Needed by TBX
42         .global __exit
43         .type   __exit,function
44 __exit:
45         XOR     TXENABLE,D0Re0,D0Re0
46         .size   __exit,.-__exit
47
48 #ifdef CONFIG_SMP
49         .global _secondary_startup
50         .type _secondary_startup,function
51 _secondary_startup:
52 #if CONFIG_PAGE_OFFSET < LINGLOBAL_BASE
53         ! In case GCOn has just been turned on we need to fence any writes that
54         ! the boot thread might have performed prior to coherency taking effect.
55         MOVT    D0Re0,#HI(LINSYSEVENT_WR_ATOMIC_UNLOCK)
56         MOV     D1Re0,#0
57         SETD    [D0Re0], D1Re0
58 #endif
59         MOVT    A0StP,#HI(_secondary_data_stack)
60         ADD     A0StP,A0StP,#LO(_secondary_data_stack)
61         GETD    A0StP,[A0StP]
62         ADD     A0StP,A0StP,#THREAD_INFO_SIZE
63         B       _secondary_start_kernel
64         .size   _secondary_startup,.-_secondary_startup
65 #endif