summaryrefslogtreecommitdiff
path: root/target/image/brcm/lzma-loader/src/head.S
blob: 9bfbd53d517bb353df3e3b6c773e82927670dc34 (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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/* Copyright 2005 Oleg I. Vdovikin (oleg@cs.msu.su)	*/
/* cache manipulation adapted from Broadcom code 	*/
/* idea taken from original bunzip2 decompressor code	*/
/* Copyright 2004 Manuel Novoa III (mjn3@codepoet.org)	*/
/* Licensed under the linux kernel's version of the GPL.*/

#include <asm/asm.h>
#include <asm/regdef.h>

#define KSEG0		0x80000000

#define C0_CONFIG	$16
#define C0_TAGLO	$28
#define C0_TAGHI	$29

#define	CONF1_DA_SHIFT	7			/* D$ associativity */
#define CONF1_DA_MASK	0x00000380
#define CONF1_DA_BASE	1
#define CONF1_DL_SHIFT	10			/* D$ line size */
#define CONF1_DL_MASK	0x00001c00
#define CONF1_DL_BASE	2
#define CONF1_DS_SHIFT	13			/* D$ sets/way */
#define CONF1_DS_MASK	0x0000e000
#define CONF1_DS_BASE	64
#define CONF1_IA_SHIFT	16			/* I$ associativity */
#define CONF1_IA_MASK	0x00070000
#define CONF1_IA_BASE	1
#define CONF1_IL_SHIFT	19			/* I$ line size */
#define CONF1_IL_MASK	0x00380000
#define CONF1_IL_BASE	2
#define CONF1_IS_SHIFT	22			/* Instruction cache sets/way */
#define CONF1_IS_MASK	0x01c00000
#define CONF1_IS_BASE	64

#define Index_Invalidate_I	0x00
#define Index_Writeback_Inv_D   0x01

	.text
	LEAF(startup)
	.set noreorder
	
	/* Copy decompressor code to the right place */
	li	t2, BZ_TEXT_START
	add	a0, t2, 0
	la      a1, code_start
	la	a2, code_stop
$L1:
	lw	t0, 0(a1)
	sw	t0, 0(a0)
	add	a1, 4
	add	a0, 4
	blt	a1, a2, $L1
	nop
	
	/* At this point we need to invalidate dcache and */
	/* icache before jumping to new code */

1:	/* Get cache sizes */
	.set	mips32
	mfc0	s0,C0_CONFIG,1
	.set	mips0

	li	s1,CONF1_DL_MASK
	and	s1,s0
	beq	s1,zero,nodc
	nop

	srl	s1,CONF1_DL_SHIFT
	li	t0,CONF1_DL_BASE
	sll	s1,t0,s1		/* s1 has D$ cache line size */

	li	s2,CONF1_DA_MASK
	and	s2,s0
	srl	s2,CONF1_DA_SHIFT
	addiu	s2,CONF1_DA_BASE	/* s2 now has D$ associativity */

	li	t0,CONF1_DS_MASK
	and	t0,s0
	srl	t0,CONF1_DS_SHIFT
	li	s3,CONF1_DS_BASE
	sll	s3,s3,t0		/* s3 has D$ sets per way */

	multu	s2,s3			/* sets/way * associativity */
	mflo	t0			/* total cache lines */

	multu	s1,t0			/* D$ linesize * lines */
	mflo	s2			/* s2 is now D$ size in bytes */

	/* Initilize the D$: */
	mtc0	zero,C0_TAGLO
	mtc0	zero,C0_TAGHI

	li	t0,KSEG0		/* Just an address for the first $ line */
	addu	t1,t0,s2		/*  + size of cache == end */

	.set	mips3
1:	cache	Index_Writeback_Inv_D,0(t0)
	.set	mips0
	bne	t0,t1,1b
	addu	t0,s1
	
nodc:
	/* Now we get to do it all again for the I$ */
	
	move	s3,zero			/* just in case there is no icache */
	move	s4,zero

	li	t0,CONF1_IL_MASK
	and	t0,s0
	beq	t0,zero,noic
	nop

	srl	t0,CONF1_IL_SHIFT
	li	s3,CONF1_IL_BASE
	sll	s3,t0			/* s3 has I$ cache line size */

	li	t0,CONF1_IA_MASK
	and	t0,s0
	srl	t0,CONF1_IA_SHIFT
	addiu	s4,t0,CONF1_IA_BASE	/* s4 now has I$ associativity */

	li	t0,CONF1_IS_MASK
	and	t0,s0
	srl	t0,CONF1_IS_SHIFT
	li	s5,CONF1_IS_BASE
	sll	s5,t0			/* s5 has I$ sets per way */

	multu	s4,s5			/* sets/way * associativity */
	mflo	t0			/* s4 is now total cache lines */

	multu	s3,t0			/* I$ linesize * lines */
	mflo	s4			/* s4 is cache size in bytes */

	/* Initilize the I$: */
	mtc0	zero,C0_TAGLO
	mtc0	zero,C0_TAGHI

	li	t0,KSEG0		/* Just an address for the first $ line */
	addu	t1,t0,s4		/*  + size of cache == end */

	.set	mips3
1:	cache	Index_Invalidate_I,0(t0)
	.set	mips0
	bne	t0,t1,1b
	addu	t0,s3

noic:
	move	a0,s3			/* icache line size */
	move	a1,s4			/* icache size */
	move	a2,s1			/* dcache line size */
	jal	t2
	move	a3,s2			/* dcache size */
	
	.set reorder
	END(startup)