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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2008-2009 coresystems GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef CPU_X86_SMM_H
#define CPU_X86_SMM_H
#include <arch/cpu.h>
#include <types.h>
#define SMM_DEFAULT_BASE 0x30000
#define SMM_DEFAULT_SIZE 0x10000
/* used only by C programs so far */
#define SMM_BASE 0xa0000
#define SMM_ENTRY_OFFSET 0x8000
#define SMM_SAVE_STATE_BEGIN(x) (SMM_ENTRY_OFFSET + (x))
#define APM_CNT 0xb2
#define APM_CNT_CST_CONTROL 0x85
#define APM_CNT_PST_CONTROL 0x80
#define APM_CNT_ACPI_DISABLE 0x1e
#define APM_CNT_ACPI_ENABLE 0xe1
#define APM_CNT_MBI_UPDATE 0xeb
#define APM_CNT_GNVS_UPDATE 0xea
#define APM_CNT_FINALIZE 0xcb
#define APM_CNT_LEGACY 0xcc
#define APM_CNT_SMMSTORE 0xed
#define APM_CNT_ELOG_GSMI 0xef
#define APM_STS 0xb3
void io_trap_handler(int smif);
int southbridge_io_trap_handler(int smif);
int mainboard_io_trap_handler(int smif);
void southbridge_smi_set_eos(void);
void cpu_smi_handler(void);
void northbridge_smi_handler(void);
void southbridge_smi_handler(void);
void smm_setup_structures(void *gnvs, void *tcg, void *smi1);
void mainboard_smi_gpi(u32 gpi_sts);
int mainboard_smi_apmc(u8 data);
void mainboard_smi_sleep(u8 slp_typ);
/* This is the SMM handler. */
extern unsigned char _binary_smm_start[];
extern unsigned char _binary_smm_end[];
struct smm_runtime {
u32 smbase;
u32 smm_size;
u32 save_state_size;
u32 num_cpus;
/* STM's 32bit entry into SMI handler */
u32 start32_offset;
/* The apic_id_to_cpu provides a mapping from APIC id to CPU number.
* The CPU number is indicated by the index into the array by matching
* the default APIC id and value at the index. The stub loader
* initializes this array with a 1:1 mapping. If the APIC ids are not
* contiguous like the 1:1 mapping it is up to the caller of the stub
* loader to adjust this mapping. */
u8 apic_id_to_cpu[CONFIG_MAX_CPUS];
} __packed;
struct smm_module_params {
void *arg;
int cpu;
const struct smm_runtime *runtime;
/* A canary value that has been placed at the end of the stack.
* If (uintptr_t)canary != *canary then a stack overflow has occurred.
*/
const uintptr_t *canary;
};
/* smm_handler_t is called with arg of smm_module_params pointer. */
typedef asmlinkage void (*smm_handler_t)(void *);
/* SMM Runtime helpers. */
/* Entry point for SMM modules. */
asmlinkage void smm_handler_start(void *params);
/* Retrieve SMM save state for a given CPU. WARNING: This does not take into
* account CPUs which are configured to not save their state to RAM. */
void *smm_get_save_state(int cpu);
/* SMM Module Loading API */
/* The smm_loader_params structure provides direction to the SMM loader:
* - stack_top - optional external stack provided to loader. It must be at
* least per_cpu_stack_size * num_concurrent_stacks in size.
* - per_cpu_stack_size - stack size per CPU for smm modules.
* - num_concurrent_stacks - number of concurrent cpus in handler needing stack
* optional for setting up relocation handler.
* - per_cpu_save_state_size - the SMM save state size per cpu
* - num_concurrent_save_states - number of concurrent cpus needing save state
* space
* - handler - optional handler to call. Only used during SMM relocation setup.
* - handler_arg - optional argument to handler for SMM relocation setup. For
* loading the SMM module, the handler_arg is filled in with
* the address of the module's parameters (if present).
* - runtime - this field is a result only. The SMM runtime location is filled
* into this field so the code doing the loading can manipulate the
* runtime's assumptions. e.g. updating the APIC id to CPU map to
* handle sparse APIC id space.
*/
struct smm_loader_params {
void *stack_top;
size_t per_cpu_stack_size;
size_t num_concurrent_stacks;
size_t per_cpu_save_state_size;
size_t num_concurrent_save_states;
smm_handler_t handler;
void *handler_arg;
struct smm_runtime *runtime;
};
/* Both of these return 0 on success, < 0 on failure. */
int smm_setup_relocation_handler(struct smm_loader_params *params);
int smm_load_module(void *smram, size_t size, struct smm_loader_params *params);
/* Backup and restore default SMM region. */
void *backup_default_smm_area(void);
void restore_default_smm_area(void *smm_save_area);
/*
* Fills in the arguments for the entire SMM region covered by chipset
* protections. e.g. TSEG.
*/
void smm_region(uintptr_t *start, size_t *size);
enum {
/* SMM handler area. */
SMM_SUBREGION_HANDLER,
/* SMM cache region. */
SMM_SUBREGION_CACHE,
/* Chipset specific area. */
SMM_SUBREGION_CHIPSET,
/* Total sub regions supported. */
SMM_SUBREGION_NUM,
};
/* Fills in the start and size for the requested SMM subregion. Returns
* 0 on success, < 0 on failure. */
int smm_subregion(int sub, uintptr_t *start, size_t *size);
/* Print the SMM memory layout on console. */
void smm_list_regions(void);
#endif /* CPU_X86_SMM_H */
|
