summaryrefslogtreecommitdiffstats
path: root/arch/mips/include/asm/mach-malta/kernel-entry-init.h
blob: 77eeda77e73c7332f9175ed4706cf18d92d8a5b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Chris Dearman (chris@mips.com)
 * Copyright (C) 2007 Mips Technologies, Inc.
 * Copyright (C) 2014 Imagination Technologies Ltd.
 */
#ifndef __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H
#define __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H

	/*
	 * Prepare segments for EVA boot:
	 *
	 * This is in case the processor boots in legacy configuration
	 * (SI_EVAReset is de-asserted and CONFIG5.K == 0)
	 *
	 * On entry, t1 is loaded with CP0_CONFIG
	 *
	 * ========================= Mappings =============================
	 * Virtual memory           Physical memory           Mapping
	 * 0x00000000 - 0x7fffffff  0x80000000 - 0xfffffffff   MUSUK (kuseg)
	 *                          Flat 2GB physical memory
	 *
	 * 0x80000000 - 0x9fffffff  0x00000000 - 0x1ffffffff   MUSUK (kseg0)
	 * 0xa0000000 - 0xbf000000  0x00000000 - 0x1ffffffff   MUSUK (kseg1)
	 * 0xc0000000 - 0xdfffffff             -                 MK  (kseg2)
	 * 0xe0000000 - 0xffffffff             -                 MK  (kseg3)
	 *
	 *
	 * Lowmem is expanded to 2GB
	 */
	.macro	eva_entry
	/*
	 * Get Config.K0 value and use it to program
	 * the segmentation registers
	 */
	andi	t1, 0x7 /* CCA */
	move	t2, t1
	ins	t2, t1, 16, 3
	/* SegCtl0 */
	li      t0, ((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) |		\
		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
		(1 << MIPS_SEGCFG_EU_SHIFT)) |				\
		(((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) |		\
		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
		(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
	or	t0, t2
	mtc0	t0, $5, 2

	/* SegCtl1 */
	li      t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |	\
		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
		(2 << MIPS_SEGCFG_C_SHIFT) |				\
		(1 << MIPS_SEGCFG_EU_SHIFT)) |				\
		(((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |		\
		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
		(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
	ins	t0, t1, 16, 3
	mtc0	t0, $5, 3

	/* SegCtl2 */
	li	t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |	\
		(6 << MIPS_SEGCFG_PA_SHIFT) |				\
		(1 << MIPS_SEGCFG_EU_SHIFT)) |				\
		(((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |		\
		(4 << MIPS_SEGCFG_PA_SHIFT) |				\
		(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
	or	t0, t2
	mtc0	t0, $5, 4

	jal	mips_ihb
	mfc0    t0, $16, 5
	li      t2, 0x40000000      /* K bit */
	or      t0, t0, t2
	mtc0    t0, $16, 5
	sync
	jal	mips_ihb
	.endm

	.macro	kernel_entry_setup

#ifdef CONFIG_EVA
	sync
	ehb

	mfc0    t1, CP0_CONFIG
	bgez    t1, 9f
	mfc0	t0, CP0_CONFIG, 1
	bgez	t0, 9f
	mfc0	t0, CP0_CONFIG, 2
	bgez	t0, 9f
	mfc0	t0, CP0_CONFIG, 3
	sll     t0, t0, 6   /* SC bit */
	bgez    t0, 9f

	eva_entry
	b       0f
9:
	/* Assume we came from YAMON... */
	PTR_LA	v0, 0x9fc00534	/* YAMON print */
	lw	v0, (v0)
	move	a0, zero
	PTR_LA  a1, nonsc_processor
	jal	v0

	PTR_LA	v0, 0x9fc00520	/* YAMON exit */
	lw	v0, (v0)
	li	a0, 1
	jal	v0

1:	b	1b
	nop
	__INITDATA
nonsc_processor:
	.asciz  "EVA kernel requires a MIPS core with Segment Control implemented\n"
	__FINIT
#endif /* CONFIG_EVA */
0:
	.endm

/*
 * Do SMP slave processor setup necessary before we can safely execute C code.
 */
	.macro	smp_slave_setup
#ifdef CONFIG_EVA
	sync
	ehb
	mfc0    t1, CP0_CONFIG
	eva_entry
#endif
	.endm

#endif /* __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H */