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
|
/*
* Qualcomm Peripheral Image Loader
*
* Copyright (C) 2016 Linaro Ltd
* Copyright (C) 2015 Sony Mobile Communications Inc
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/device.h>
#include <linux/elf.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/qcom_scm.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/soc/qcom/mdt_loader.h>
static bool mdt_phdr_valid(const struct elf32_phdr *phdr)
{
if (phdr->p_type != PT_LOAD)
return false;
if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
return false;
if (!phdr->p_memsz)
return false;
return true;
}
/**
* qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
* @fw: firmware object for the mdt file
*
* Returns size of the loaded firmware blob, or -EINVAL on failure.
*/
ssize_t qcom_mdt_get_size(const struct firmware *fw)
{
const struct elf32_phdr *phdrs;
const struct elf32_phdr *phdr;
const struct elf32_hdr *ehdr;
phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
phys_addr_t max_addr = 0;
int i;
ehdr = (struct elf32_hdr *)fw->data;
phdrs = (struct elf32_phdr *)(ehdr + 1);
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (!mdt_phdr_valid(phdr))
continue;
if (phdr->p_paddr < min_addr)
min_addr = phdr->p_paddr;
if (phdr->p_paddr + phdr->p_memsz > max_addr)
max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
}
return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
}
EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
/**
* qcom_mdt_load() - load the firmware which header is loaded as fw
* @dev: device handle to associate resources with
* @fw: firmware object for the mdt file
* @firmware: name of the firmware, for construction of segment file names
* @pas_id: PAS identifier
* @mem_region: allocated memory region to load firmware into
* @mem_phys: physical address of allocated memory region
* @mem_size: size of the allocated memory region
*
* Returns 0 on success, negative errno otherwise.
*/
int qcom_mdt_load(struct device *dev, const struct firmware *fw,
const char *firmware, int pas_id, void *mem_region,
phys_addr_t mem_phys, size_t mem_size)
{
const struct elf32_phdr *phdrs;
const struct elf32_phdr *phdr;
const struct elf32_hdr *ehdr;
const struct firmware *seg_fw;
phys_addr_t mem_reloc;
phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
phys_addr_t max_addr = 0;
size_t fw_name_len;
size_t offset;
char *fw_name;
bool relocate = false;
void *ptr;
int ret;
int i;
if (!fw || !mem_region || !mem_phys || !mem_size)
return -EINVAL;
ehdr = (struct elf32_hdr *)fw->data;
phdrs = (struct elf32_phdr *)(ehdr + 1);
fw_name_len = strlen(firmware);
if (fw_name_len <= 4)
return -EINVAL;
fw_name = kstrdup(firmware, GFP_KERNEL);
if (!fw_name)
return -ENOMEM;
ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
if (ret) {
dev_err(dev, "invalid firmware metadata\n");
goto out;
}
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (!mdt_phdr_valid(phdr))
continue;
if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
relocate = true;
if (phdr->p_paddr < min_addr)
min_addr = phdr->p_paddr;
if (phdr->p_paddr + phdr->p_memsz > max_addr)
max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
}
if (relocate) {
ret = qcom_scm_pas_mem_setup(pas_id, mem_phys, max_addr - min_addr);
if (ret) {
dev_err(dev, "unable to setup relocation\n");
goto out;
}
/*
* The image is relocatable, so offset each segment based on
* the lowest segment address.
*/
mem_reloc = min_addr;
} else {
/*
* Image is not relocatable, so offset each segment based on
* the allocated physical chunk of memory.
*/
mem_reloc = mem_phys;
}
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (!mdt_phdr_valid(phdr))
continue;
offset = phdr->p_paddr - mem_reloc;
if (offset < 0 || offset + phdr->p_memsz > mem_size) {
dev_err(dev, "segment outside memory range\n");
ret = -EINVAL;
break;
}
ptr = mem_region + offset;
if (phdr->p_filesz) {
sprintf(fw_name + fw_name_len - 3, "b%02d", i);
ret = request_firmware(&seg_fw, fw_name, dev);
if (ret) {
dev_err(dev, "failed to load %s\n", fw_name);
break;
}
memcpy(ptr, seg_fw->data, seg_fw->size);
release_firmware(seg_fw);
}
if (phdr->p_memsz > phdr->p_filesz)
memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
}
out:
kfree(fw_name);
return ret;
}
EXPORT_SYMBOL_GPL(qcom_mdt_load);
MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
MODULE_LICENSE("GPL v2");
|
