aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/include/asm/cache.h
blob: 41f85ae4bd4ad7de07ff2fab14804ad75bac3d80 (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
/* cache.h:  Cache specific code for the Sparc.  These include flushing
 *           and direct tag/data line access.
 *
 * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
 */

#ifndef _SPARC_CACHE_H
#define _SPARC_CACHE_H

#define L1_CACHE_SHIFT 5
#define L1_CACHE_BYTES 32
#define L1_CACHE_ALIGN(x) ((((x)+(L1_CACHE_BYTES-1))&~(L1_CACHE_BYTES-1)))

#ifdef CONFIG_SPARC32
#define SMP_CACHE_BYTES_SHIFT 5
#else
#define SMP_CACHE_BYTES_SHIFT 6
#endif

#define SMP_CACHE_BYTES (1 << SMP_CACHE_BYTES_SHIFT)

#define __read_mostly __attribute__((__section__(".data.read_mostly")))

#ifdef CONFIG_SPARC32
#include <asm/asi.h>

/* Direct access to the instruction cache is provided through and
 * alternate address space.  The IDC bit must be off in the ICCR on
 * HyperSparcs for these accesses to work.  The code below does not do
 * any checking, the caller must do so.  These routines are for
 * diagnostics only, but could end up being useful.  Use with care.
 * Also, you are asking for trouble if you execute these in one of the
 * three instructions following a %asr/%psr access or modification.
 */

/* First, cache-tag access. */
static inline unsigned int get_icache_tag(int setnum, int tagnum)
{
	unsigned int vaddr, retval;

	vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
	__asm__ __volatile__("lda [%1] %2, %0\n\t" :
			     "=r" (retval) :
			     "r" (vaddr), "i" (ASI_M_TXTC_TAG));
	return retval;
}

static inline void put_icache_tag(int setnum, int tagnum, unsigned int entry)
{
	unsigned int vaddr;

	vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
	__asm__ __volatile__("sta %0, [%1] %2\n\t" : :
			     "r" (entry), "r" (vaddr), "i" (ASI_M_TXTC_TAG) :
			     "memory");
}

/* Second cache-data access.  The data is returned two-32bit quantities
 * at a time.
 */
static inline void get_icache_data(int setnum, int tagnum, int subblock,
				       unsigned int *data)
{
	unsigned int value1, value2, vaddr;

	vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
		((subblock&0x3) << 3);
	__asm__ __volatile__("ldda [%2] %3, %%g2\n\t"
			     "or %%g0, %%g2, %0\n\t"
			     "or %%g0, %%g3, %1\n\t" :
			     "=r" (value1), "=r" (value2) :
			     "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
			     "g2", "g3");
	data[0] = value1; data[1] = value2;
}

static inline void put_icache_data(int setnum, int tagnum, int subblock,
				       unsigned int *data)
{
	unsigned int value1, value2, vaddr;

	vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
		((subblock&0x3) << 3);
	value1 = data[0]; value2 = data[1];
	__asm__ __volatile__("or %%g0, %0, %%g2\n\t"
			     "or %%g0, %1, %%g3\n\t"
			     "stda %%g2, [%2] %3\n\t" : :
			     "r" (value1), "r" (value2), 
			     "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
			     "g2", "g3", "memory" /* no joke */);
}

/* Different types of flushes with the ICACHE.  Some of the flushes
 * affect both the ICACHE and the external cache.  Others only clear
 * the ICACHE entries on the cpu itself.  V8's (most) allow
 * granularity of flushes on the packet (element in line), whole line,
 * and entire cache (ie. all lines) level.  The ICACHE only flushes are
 * ROSS HyperSparc specific and are in ross.h
 */

/* Flushes which clear out both the on-chip and external caches */
static inline void flush_ei_page(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_PAGE) :
			     "memory");
}

static inline void flush_ei_seg(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_SEG) :
			     "memory");
}

static inline void flush_ei_region(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_REGION) :
			     "memory");
}

static inline void flush_ei_ctx(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_CTX) :
			     "memory");
}

static inline void flush_ei_user(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_USER) :
			     "memory");
}
#endif /* CONFIG_SPARC32 */

#endif /* !(_SPARC_CACHE_H) */