1 /*
2 * This file is subject to the terms and condi
3 * License. See the file "COPYING" in the mai
4 * for more details.
5 *
6 * Copyright (C) 1994, 1995 Waldorf Electronic
7 * Written by Ralf Baechle and Andreas Busse
8 * Copyright (C) 1994 - 99, 2003, 06 Ralf Baec
9 * Copyright (C) 1996 Paul M. Antoine
10 * Modified for DECStation and hence R3000 sup
11 * Further modifications by David S. Miller an
12 * Copyright (C) 1999 Silicon Graphics, Inc.
13 * Kevin Kissell, kevink@mips.com and Carsten
14 * Copyright (C) 2000 MIPS Technologies, Inc.
15 */
16 #include <linux/init.h>
17 #include <linux/threads.h>
18
19 #include <asm/addrspace.h>
20 #include <asm/asm.h>
21 #include <asm/asmmacro.h>
22 #include <asm/irqflags.h>
23 #include <asm/regdef.h>
24 #include <asm/mipsregs.h>
25 #include <asm/stackframe.h>
26
27 #include <kernel-entry-init.h>
28
29 /*
30 * For the moment disable interrupts,
31 * set ST0_KX so that the CPU does not
32 * 64-bit addresses. A full initializ
33 * register is done later in per_cpu_t
34 */
35 .macro setup_c0_status set clr
36 .set push
37 mfc0 t0, CP0_STATUS
38 or t0, ST0_KERNEL_CUMASK|\set|0x1
39 xor t0, 0x1f|\clr
40 mtc0 t0, CP0_STATUS
41 .set noreorder
42 sll zero,3
43 .set pop
44 .endm
45
46 .macro setup_c0_status_pri
47 #ifdef CONFIG_64BIT
48 setup_c0_status ST0_KX 0
49 #else
50 setup_c0_status 0 0
51 #endif
52 .endm
53
54 .macro setup_c0_status_sec
55 #ifdef CONFIG_64BIT
56 setup_c0_status ST0_KX ST0_BEV
57 #else
58 setup_c0_status 0 ST0_BEV
59 #endif
60 .endm
61
62 #ifndef CONFIG_NO_EXCEPT_FILL
63 /*
64 * Reserved space for exception handle
65 * Necessary for machines which link t
66 */
67 .fill 0x400
68 #endif
69
70 EXPORT(_stext)
71
72 #ifdef CONFIG_BOOT_RAW
73 /*
74 * Give us a fighting chance of runnin
75 * kernel load address. This is neede
76 * not have a ELF loader yet.
77 */
78 FEXPORT(__kernel_entry)
79 j kernel_entry
80 #endif /* CONFIG_BOOT_RAW */
81
82 __REF
83
84 NESTED(kernel_entry, 16, sp)
85
86 kernel_entry_setup
87
88 setup_c0_status_pri
89
90 /* We might not get launched at the ad
91 so we jump there. */
92 PTR_LA t0, 0f
93 jr t0
94 0:
95
96 PTR_LA t0, __bss_start
97 LONG_S zero, (t0)
98 PTR_LA t1, __bss_stop - LONGS
99 1:
100 PTR_ADDIU t0, LONGSIZE
101 LONG_S zero, (t0)
102 bne t0, t1, 1b
103
104 LONG_S a0, fw_arg0
105 LONG_S a1, fw_arg1
106 LONG_S a2, fw_arg2
107 LONG_S a3, fw_arg3
108
109 MTC0 zero, CP0_CONTEXT
110 #ifdef CONFIG_64BIT
111 MTC0 zero, CP0_XCONTEXT
112 #endif
113 PTR_LA $28, init_thread_union
114 /* Set the SP after an empty pt_regs.
115 PTR_LI sp, _THREAD_SIZE - 32
116 PTR_ADDU sp, $28
117 back_to_back_c0_hazard
118 set_saved_sp sp, t0, t1
119 PTR_SUBU sp, 4 * SZREG
120
121 #ifdef CONFIG_RELOCATABLE
122 /* Copy kernel and apply the relocatio
123 jal relocate_kernel
124
125 /* Repoint the sp into the new kernel
126 PTR_LI sp, _THREAD_SIZE - 32
127 PTR_ADDU sp, $28
128 set_saved_sp sp, t0, t1
129 PTR_SUBU sp, 4 * SZREG
130
131 /*
132 * relocate_kernel returns the entry p
133 * in the relocated kernel or the orig
134 * some reason relocation failed - jum
135 * with instruction hazard barrier bec
136 * newly sync'd icache.
137 */
138 jr.hb v0
139 #else /* !CONFIG_RELOCATABLE */
140 j start_kernel
141 #endif /* !CONFIG_RELOCATABLE */
142 END(kernel_entry)
143
144 #ifdef CONFIG_SMP
145 /*
146 * SMP slave cpus entry point. Board specific
147 * function after setting up the stack and gp
148 */
149 NESTED(smp_bootstrap, 16, sp)
150 smp_slave_setup
151 setup_c0_status_sec
152 j start_secondary
153 END(smp_bootstrap)
154 #endif /* CONFIG_SMP */
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