aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ia64/kernel/esi.c
blob: ebf4e988e78ca7abd8e0397668dfeb5bc1ee47ae (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
/*
 * Extensible SAL Interface (ESI) support routines.
 *
 * Copyright (C) 2006 Hewlett-Packard Co
 * 	Alex Williamson <alex.williamson@hp.com>
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>

#include <asm/esi.h>
#include <asm/sal.h>

MODULE_AUTHOR("Alex Williamson <alex.williamson@hp.com>");
MODULE_DESCRIPTION("Extensible SAL Interface (ESI) support");
MODULE_LICENSE("GPL");

#define MODULE_NAME	"esi"

#define ESI_TABLE_GUID					\
    EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3,		\
	     0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)

enum esi_systab_entry_type {
	ESI_DESC_ENTRY_POINT = 0
};

/*
 * Entry type:	Size:
 *	0	48
 */
#define ESI_DESC_SIZE(type)	"\060"[(unsigned) (type)]

typedef struct ia64_esi_desc_entry_point {
	u8 type;
	u8 reserved1[15];
	u64 esi_proc;
	u64 gp;
	efi_guid_t guid;
} ia64_esi_desc_entry_point_t;

struct pdesc {
	void *addr;
	void *gp;
};

static struct ia64_sal_systab *esi_systab;

static int __init esi_init (void)
{
	efi_config_table_t *config_tables;
	struct ia64_sal_systab *systab;
	unsigned long esi = 0;
	char *p;
	int i;

	config_tables = __va(efi.systab->tables);

	for (i = 0; i < (int) efi.systab->nr_tables; ++i) {
		if (efi_guidcmp(config_tables[i].guid, ESI_TABLE_GUID) == 0) {
			esi = config_tables[i].table;
			break;
		}
	}

	if (!esi)
		return -ENODEV;;

	systab = __va(esi);

	if (strncmp(systab->signature, "ESIT", 4) != 0) {
		printk(KERN_ERR "bad signature in ESI system table!");
		return -ENODEV;
	}

	p = (char *) (systab + 1);
	for (i = 0; i < systab->entry_count; i++) {
		/*
		 * The first byte of each entry type contains the type
		 * descriptor.
		 */
		switch (*p) {
		      case ESI_DESC_ENTRY_POINT:
			break;
		      default:
			printk(KERN_WARNING "Unkown table type %d found in "
			       "ESI table, ignoring rest of table\n", *p);
			return -ENODEV;
		}

		p += ESI_DESC_SIZE(*p);
	}

	esi_systab = systab;
	return 0;
}


int ia64_esi_call (efi_guid_t guid, struct ia64_sal_retval *isrvp,
		   enum esi_proc_type proc_type, u64 func,
		   u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
		   u64 arg7)
{
	struct ia64_fpreg fr[6];
	unsigned long flags = 0;
	int i;
	char *p;

	if (!esi_systab)
		return -1;

	p = (char *) (esi_systab + 1);
	for (i = 0; i < esi_systab->entry_count; i++) {
		if (*p == ESI_DESC_ENTRY_POINT) {
			ia64_esi_desc_entry_point_t *esi = (void *)p;
			if (!efi_guidcmp(guid, esi->guid)) {
				ia64_sal_handler esi_proc;
				struct pdesc pdesc;

				pdesc.addr = __va(esi->esi_proc);
				pdesc.gp = __va(esi->gp);

				esi_proc = (ia64_sal_handler) &pdesc;

				ia64_save_scratch_fpregs(fr);
				if (proc_type == ESI_PROC_SERIALIZED)
					spin_lock_irqsave(&sal_lock, flags);
				else if (proc_type == ESI_PROC_MP_SAFE)
					local_irq_save(flags);
				else
					preempt_disable();
				*isrvp = (*esi_proc)(func, arg1, arg2, arg3,
						     arg4, arg5, arg6, arg7);
				if (proc_type == ESI_PROC_SERIALIZED)
					spin_unlock_irqrestore(&sal_lock,
							       flags);
				else if (proc_type == ESI_PROC_MP_SAFE)
					local_irq_restore(flags);
				else
					preempt_enable();
				ia64_load_scratch_fpregs(fr);
				return 0;
			}
		}
		p += ESI_DESC_SIZE(*p);
	}
	return -1;
}
EXPORT_SYMBOL_GPL(ia64_esi_call);

int ia64_esi_call_phys (efi_guid_t guid, struct ia64_sal_retval *isrvp,
			u64 func, u64 arg1, u64 arg2, u64 arg3, u64 arg4,
			u64 arg5, u64 arg6, u64 arg7)
{
	struct ia64_fpreg fr[6];
	unsigned long flags;
	u64 esi_params[8];
	char *p;
	int i;

	if (!esi_systab)
		return -1;

	p = (char *) (esi_systab + 1);
	for (i = 0; i < esi_systab->entry_count; i++) {
		if (*p == ESI_DESC_ENTRY_POINT) {
			ia64_esi_desc_entry_point_t *esi = (void *)p;
			if (!efi_guidcmp(guid, esi->guid)) {
				ia64_sal_handler esi_proc;
				struct pdesc pdesc;

				pdesc.addr = (void *)esi->esi_proc;
				pdesc.gp = (void *)esi->gp;

				esi_proc = (ia64_sal_handler) &pdesc;

				esi_params[0] = func;
				esi_params[1] = arg1;
				esi_params[2] = arg2;
				esi_params[3] = arg3;
				esi_params[4] = arg4;
				esi_params[5] = arg5;
				esi_params[6] = arg6;
				esi_params[7] = arg7;
				ia64_save_scratch_fpregs(fr);
				spin_lock_irqsave(&sal_lock, flags);
				*isrvp = esi_call_phys(esi_proc, esi_params);
				spin_unlock_irqrestore(&sal_lock, flags);
				ia64_load_scratch_fpregs(fr);
				return 0;
			}
		}
		p += ESI_DESC_SIZE(*p);
	}
	return -1;
}
EXPORT_SYMBOL_GPL(ia64_esi_call_phys);

static void __exit esi_exit (void)
{
}

module_init(esi_init);
module_exit(esi_exit);	/* makes module removable... */