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| 4 | #include <linux/firmware.h>
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| 5 | #include "../firmware.h"
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| 6 |
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| 7 |
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| 8 | #ifdef CONFIG_FW_LOADER
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| 9 |
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| 10 | struct builtin_fw {
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| 11 | char *name;
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| 12 | void *data;
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| 13 | unsigned long size;
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| 14 | };
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| 15 |
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| 16 | extern struct builtin_fw __start_builtin_fw[];
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| 17 | extern struct builtin_fw __end_builtin_fw[];
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| 18 |
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| 19 | static bool fw_copy_to_prealloc_buf(struct firmware *fw,
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| 20 | void *buf, size_t size)
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| 21 | {
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| 22 | if (!buf)
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| 23 | return true;
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| 24 | if (size < fw->size)
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| 25 | return false;
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| 26 | memcpy(buf, fw->data, fw->size);
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| 27 | return true;
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| 28 | }
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| 29 |
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| 30 | |
| 31 | * firmware_request_builtin() - load builtin firmware
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| 32 | * @fw: pointer to firmware struct
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| 33 | * @name: name of firmware file
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| 34 | *
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| 35 | * Some use cases in the kernel have a requirement so that no memory allocator
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| 36 | * is involved as these calls take place early in boot process. An example is
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| 37 | * the x86 CPU microcode loader. In these cases all the caller wants is to see
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| 38 | * if the firmware was built-in and if so use it right away. This can be used
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| 39 | * for such cases.
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| 40 | *
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| 41 | * This looks for the firmware in the built-in kernel. Only if the kernel was
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| 42 | * built-in with the firmware you are looking for will this return successfully.
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| 43 | *
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| 44 | * Callers of this API do not need to use release_firmware() as the pointer to
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| 45 | * the firmware is expected to be provided locally on the stack of the caller.
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| 46 | *
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| 47 | bool firmware_request_builtin(struct firmware *fw, const char *name)
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| 48 | {
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| 49 | struct builtin_fw *b_fw;
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| 50 |
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| 51 | if (!fw)
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| 52 | return false;
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| 53 |
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| 54 | for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
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| 55 | if (strcmp(name, b_fw->name) == 0) {
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| 56 | if (b_fw->size == 0)
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| 57 | return false;
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| 58 | fw->size = b_fw->size;
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| 59 | fw->data = b_fw->data;
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| 60 | return true;
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| 61 | }
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| 62 | }
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| 63 |
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| 64 | return false;
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| 65 | }
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| 66 | EXPORT_SYMBOL_NS_GPL(firmware_request_builtin, "TEST_FIRMWARE");
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| 67 |
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| 68 | |
| 69 | * firmware_request_builtin_buf() - load builtin firmware into optional buffer
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| 70 | * @fw: pointer to firmware struct
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| 71 | * @name: name of firmware file
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| 72 | * @buf: If set this lets you use a pre-allocated buffer so that the built-in
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| 73 | * firmware into is copied into. This field can be NULL. It is used by
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| 74 | * callers such as request_firmware_into_buf() and
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| 75 | * request_partial_firmware_into_buf()
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| 76 | * @size: if buf was provided, the max size of the allocated buffer available.
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| 77 | * If the built-in firmware does not fit into the pre-allocated @buf this
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| 78 | * call will fail.
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| 79 | *
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| 80 | * This looks for the firmware in the built-in kernel. Only if the kernel was
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| 81 | * built-in with the firmware you are looking for will this call possibly
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| 82 | * succeed. If you passed a @buf the firmware will be copied into it *iff* the
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| 83 | * built-in firmware fits into the pre-allocated buffer size specified in
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| 84 | * @size.
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| 85 | *
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| 86 | * This caller is to be used internally by the firmware_loader only.
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| 87 | *
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| 88 | bool firmware_request_builtin_buf(struct firmware *fw, const char *name,
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| 89 | void *buf, size_t size)
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| 90 | {
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| 91 | if (!firmware_request_builtin(fw, name))
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| 92 | return false;
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| 93 |
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| 94 | return fw_copy_to_prealloc_buf(fw, buf, size);
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| 95 | }
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| 96 |
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| 97 | bool firmware_is_builtin(const struct firmware *fw)
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| 98 | {
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| 99 | struct builtin_fw *b_fw;
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| 100 |
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| 101 | for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++)
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| 102 | if (fw->data == b_fw->data)
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| 103 | return true;
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| 104 |
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| 105 | return false;
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| 106 | }
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| 107 |
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| 108 | #endif
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