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ecd27b92 CD |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Chris Dearman (chris@mips.com) | |
7 | * Copyright (C) 2007 Mips Technologies, Inc. | |
f8b7faf1 | 8 | * Copyright (C) 2014 Imagination Technologies Ltd. |
ecd27b92 CD |
9 | */ |
10 | #ifndef __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H | |
11 | #define __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H | |
12 | ||
f8b7faf1 MC |
13 | /* |
14 | * Prepare segments for EVA boot: | |
15 | * | |
16 | * This is in case the processor boots in legacy configuration | |
17 | * (SI_EVAReset is de-asserted and CONFIG5.K == 0) | |
18 | * | |
19 | * On entry, t1 is loaded with CP0_CONFIG | |
20 | * | |
21 | * ========================= Mappings ============================= | |
22 | * Virtual memory Physical memory Mapping | |
23 | * 0x00000000 - 0x7fffffff 0x80000000 - 0xfffffffff MUSUK (kuseg) | |
24 | * Flat 2GB physical memory | |
25 | * | |
26 | * 0x80000000 - 0x9fffffff 0x00000000 - 0x1ffffffff MUSUK (kseg0) | |
27 | * 0xa0000000 - 0xbf000000 0x00000000 - 0x1ffffffff MUSUK (kseg1) | |
28 | * 0xc0000000 - 0xdfffffff - MK (kseg2) | |
29 | * 0xe0000000 - 0xffffffff - MK (kseg3) | |
30 | * | |
31 | * | |
32 | * Lowmem is expanded to 2GB | |
33 | */ | |
34 | .macro eva_entry | |
35 | /* | |
36 | * Get Config.K0 value and use it to program | |
37 | * the segmentation registers | |
38 | */ | |
39 | andi t1, 0x7 /* CCA */ | |
40 | move t2, t1 | |
41 | ins t2, t1, 16, 3 | |
42 | /* SegCtl0 */ | |
43 | li t0, ((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \ | |
44 | (0 << MIPS_SEGCFG_PA_SHIFT) | \ | |
45 | (1 << MIPS_SEGCFG_EU_SHIFT)) | \ | |
46 | (((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \ | |
47 | (0 << MIPS_SEGCFG_PA_SHIFT) | \ | |
48 | (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) | |
49 | or t0, t2 | |
50 | mtc0 t0, $5, 2 | |
51 | ||
52 | /* SegCtl1 */ | |
53 | li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ | |
54 | (0 << MIPS_SEGCFG_PA_SHIFT) | \ | |
55 | (2 << MIPS_SEGCFG_C_SHIFT) | \ | |
56 | (1 << MIPS_SEGCFG_EU_SHIFT)) | \ | |
57 | (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ | |
58 | (0 << MIPS_SEGCFG_PA_SHIFT) | \ | |
59 | (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) | |
60 | ins t0, t1, 16, 3 | |
61 | mtc0 t0, $5, 3 | |
62 | ||
63 | /* SegCtl2 */ | |
64 | li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ | |
65 | (6 << MIPS_SEGCFG_PA_SHIFT) | \ | |
66 | (1 << MIPS_SEGCFG_EU_SHIFT)) | \ | |
67 | (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ | |
68 | (4 << MIPS_SEGCFG_PA_SHIFT) | \ | |
69 | (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) | |
70 | or t0, t2 | |
71 | mtc0 t0, $5, 4 | |
72 | ||
73 | jal mips_ihb | |
74 | mfc0 t0, $16, 5 | |
75 | li t2, 0x40000000 /* K bit */ | |
76 | or t0, t0, t2 | |
77 | mtc0 t0, $16, 5 | |
78 | sync | |
79 | jal mips_ihb | |
80 | .endm | |
81 | ||
ecd27b92 | 82 | .macro kernel_entry_setup |
f8b7faf1 MC |
83 | |
84 | #ifdef CONFIG_EVA | |
85 | sync | |
86 | ehb | |
87 | ||
88 | mfc0 t1, CP0_CONFIG | |
89 | bgez t1, 9f | |
90 | mfc0 t0, CP0_CONFIG, 1 | |
91 | bgez t0, 9f | |
92 | mfc0 t0, CP0_CONFIG, 2 | |
93 | bgez t0, 9f | |
94 | mfc0 t0, CP0_CONFIG, 3 | |
95 | sll t0, t0, 6 /* SC bit */ | |
96 | bgez t0, 9f | |
97 | ||
98 | eva_entry | |
99 | b 0f | |
100 | 9: | |
101 | /* Assume we came from YAMON... */ | |
102 | PTR_LA v0, 0x9fc00534 /* YAMON print */ | |
103 | lw v0, (v0) | |
104 | move a0, zero | |
105 | PTR_LA a1, nonsc_processor | |
106 | jal v0 | |
107 | ||
108 | PTR_LA v0, 0x9fc00520 /* YAMON exit */ | |
109 | lw v0, (v0) | |
110 | li a0, 1 | |
111 | jal v0 | |
112 | ||
113 | 1: b 1b | |
114 | nop | |
115 | __INITDATA | |
116 | nonsc_processor: | |
117 | .asciz "EVA kernel requires a MIPS core with Segment Control implemented\n" | |
118 | __FINIT | |
119 | #endif /* CONFIG_EVA */ | |
120 | 0: | |
ecd27b92 CD |
121 | .endm |
122 | ||
123 | /* | |
124 | * Do SMP slave processor setup necessary before we can safely execute C code. | |
125 | */ | |
126 | .macro smp_slave_setup | |
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127 | #ifdef CONFIG_EVA |
128 | sync | |
129 | ehb | |
130 | mfc0 t1, CP0_CONFIG | |
131 | eva_entry | |
132 | #endif | |
ecd27b92 CD |
133 | .endm |
134 | ||
135 | #endif /* __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H */ |