107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Builtin firmware support */
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#include <linux/firmware.h>
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#include "../firmware.h"
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/* Only if FW_LOADER=y */
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#ifdef CONFIG_FW_LOADER
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struct builtin_fw {
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char *name;
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void *data;
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unsigned long size;
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};
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extern struct builtin_fw __start_builtin_fw[];
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extern struct builtin_fw __end_builtin_fw[];
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static bool fw_copy_to_prealloc_buf(struct firmware *fw,
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void *buf, size_t size)
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{
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if (!buf)
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return true;
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if (size < fw->size)
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return false;
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memcpy(buf, fw->data, fw->size);
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return true;
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}
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/**
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* firmware_request_builtin() - load builtin firmware
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* @fw: pointer to firmware struct
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* @name: name of firmware file
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*
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* Some use cases in the kernel have a requirement so that no memory allocator
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* is involved as these calls take place early in boot process. An example is
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* the x86 CPU microcode loader. In these cases all the caller wants is to see
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* if the firmware was built-in and if so use it right away. This can be used
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* for such cases.
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*
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* This looks for the firmware in the built-in kernel. Only if the kernel was
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* built-in with the firmware you are looking for will this return successfully.
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*
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* Callers of this API do not need to use release_firmware() as the pointer to
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* the firmware is expected to be provided locally on the stack of the caller.
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**/
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bool firmware_request_builtin(struct firmware *fw, const char *name)
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{
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struct builtin_fw *b_fw;
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if (!fw)
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return false;
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for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
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if (strcmp(name, b_fw->name) == 0) {
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fw->size = b_fw->size;
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fw->data = b_fw->data;
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return true;
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}
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}
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return false;
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}
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EXPORT_SYMBOL_NS_GPL(firmware_request_builtin, TEST_FIRMWARE);
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/**
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* firmware_request_builtin_buf() - load builtin firmware into optional buffer
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* @fw: pointer to firmware struct
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* @name: name of firmware file
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* @buf: If set this lets you use a pre-allocated buffer so that the built-in
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* firmware into is copied into. This field can be NULL. It is used by
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* callers such as request_firmware_into_buf() and
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* request_partial_firmware_into_buf()
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* @size: if buf was provided, the max size of the allocated buffer available.
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* If the built-in firmware does not fit into the pre-allocated @buf this
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* call will fail.
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*
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* This looks for the firmware in the built-in kernel. Only if the kernel was
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* built-in with the firmware you are looking for will this call possibly
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* succeed. If you passed a @buf the firmware will be copied into it *iff* the
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* built-in firmware fits into the pre-allocated buffer size specified in
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* @size.
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*
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* This caller is to be used internally by the firmware_loader only.
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**/
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bool firmware_request_builtin_buf(struct firmware *fw, const char *name,
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void *buf, size_t size)
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{
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if (!firmware_request_builtin(fw, name))
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return false;
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return fw_copy_to_prealloc_buf(fw, buf, size);
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}
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bool firmware_is_builtin(const struct firmware *fw)
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{
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struct builtin_fw *b_fw;
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for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++)
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if (fw->data == b_fw->data)
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return true;
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return false;
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}
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#endif
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