Gitiles
Code Review Sign In
192.168.1.100 / T108 / e958203796650e3959a43708d67534bf36f4c83b / . / marvell / linux / arch / mips / include / asm / mach-malta / kernel-entry-init.h
blob: ab03eb3fadac2e8959734d638050fee61678e9c9 [file] [log] [blame]
b.liue9582032025-04-17 19:18:16 +0800[diff] [blame^]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.
8 * Copyright (C) 2014 Imagination Technologies Ltd.
9 */
10#ifndef __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H
11#define __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H
12
13#include <asm/regdef.h>
14#include <asm/mipsregs.h>
15
16 /*
17 * Prepare segments for EVA boot:
18 *
19 * This is in case the processor boots in legacy configuration
20 * (SI_EVAReset is de-asserted and CONFIG5.K == 0)
21 *
22 * ========================= Mappings =============================
23 * Virtual memory Physical memory Mapping
24 * 0x00000000 - 0x7fffffff 0x80000000 - 0xfffffffff MUSUK (kuseg)
25 * Flat 2GB physical memory
26 *
27 * 0x80000000 - 0x9fffffff 0x00000000 - 0x1ffffffff MUSUK (kseg0)
28 * 0xa0000000 - 0xbf000000 0x00000000 - 0x1ffffffff MUSUK (kseg1)
29 * 0xc0000000 - 0xdfffffff - MK (kseg2)
30 * 0xe0000000 - 0xffffffff - MK (kseg3)
31 *
32 *
33 * Lowmem is expanded to 2GB
34 *
35 * The following code uses the t0, t1, t2 and ra registers without
36 * previously preserving them.
37 *
38 */
39 .macro platform_eva_init
40
41 .set push
42 .set reorder
43 /*
44 * Get Config.K0 value and use it to program
45 * the segmentation registers
46 */
47 mfc0 t1, CP0_CONFIG
48 andi t1, 0x7 /* CCA */
49 move t2, t1
50 ins t2, t1, 16, 3
51 /* SegCtl0 */
52 li t0, ((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \
53 (0 << MIPS_SEGCFG_PA_SHIFT) | \
54 (1 << MIPS_SEGCFG_EU_SHIFT)) | \
55 (((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \
56 (0 << MIPS_SEGCFG_PA_SHIFT) | \
57 (1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
58 or t0, t2
59 mtc0 t0, CP0_SEGCTL0
60
61 /* SegCtl1 */
62 li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
63 (0 << MIPS_SEGCFG_PA_SHIFT) | \
64 (2 << MIPS_SEGCFG_C_SHIFT) | \
65 (1 << MIPS_SEGCFG_EU_SHIFT)) | \
66 (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
67 (0 << MIPS_SEGCFG_PA_SHIFT) | \
68 (1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
69 ins t0, t1, 16, 3
70 mtc0 t0, CP0_SEGCTL1
71
72 /* SegCtl2 */
73 li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
74 (6 << MIPS_SEGCFG_PA_SHIFT) | \
75 (1 << MIPS_SEGCFG_EU_SHIFT)) | \
76 (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
77 (4 << MIPS_SEGCFG_PA_SHIFT) | \
78 (1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
79 or t0, t2
80 mtc0 t0, CP0_SEGCTL2
81
82 jal mips_ihb
83 mfc0 t0, $16, 5
84 li t2, 0x40000000 /* K bit */
85 or t0, t0, t2
86 mtc0 t0, $16, 5
87 sync
88 jal mips_ihb
89
90 .set pop
91 .endm
92
93 .macro kernel_entry_setup
94
95#ifdef CONFIG_EVA
96 sync
97 ehb
98
99 mfc0 t1, CP0_CONFIG
100 bgez t1, 9f
101 mfc0 t0, CP0_CONFIG, 1
102 bgez t0, 9f
103 mfc0 t0, CP0_CONFIG, 2
104 bgez t0, 9f
105 mfc0 t0, CP0_CONFIG, 3
106 sll t0, t0, 6 /* SC bit */
107 bgez t0, 9f
108
109 platform_eva_init
110 b 0f
1119:
112 /* Assume we came from YAMON... */
113 PTR_LA v0, 0x9fc00534 /* YAMON print */
114 lw v0, (v0)
115 move a0, zero
116 PTR_LA a1, nonsc_processor
117 jal v0
118
119 PTR_LA v0, 0x9fc00520 /* YAMON exit */
120 lw v0, (v0)
121 li a0, 1
122 jal v0
123
1241: b 1b
125 nop
126 __INITDATA
127nonsc_processor:
128 .asciz "EVA kernel requires a MIPS core with Segment Control implemented\n"
129 __FINIT
130#endif /* CONFIG_EVA */
1310:
132 .endm
133
134/*
135 * Do SMP slave processor setup necessary before we can safely execute C code.
136 */
137 .macro smp_slave_setup
138#ifdef CONFIG_EVA
139 sync
140 ehb
141 platform_eva_init
142#endif
143 .endm
144
145#endif /* __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H */