148d09e97SLuis Chamberlain // SPDX-License-Identifier: GPL-2.0
248d09e97SLuis Chamberlain /* Builtin firmware support */
348d09e97SLuis Chamberlain
448d09e97SLuis Chamberlain #include <linux/firmware.h>
548d09e97SLuis Chamberlain #include "../firmware.h"
648d09e97SLuis Chamberlain
748d09e97SLuis Chamberlain /* Only if FW_LOADER=y */
848d09e97SLuis Chamberlain #ifdef CONFIG_FW_LOADER
948d09e97SLuis Chamberlain
10*e2e2c0f2SLuis Chamberlain struct builtin_fw {
11*e2e2c0f2SLuis Chamberlain char *name;
12*e2e2c0f2SLuis Chamberlain void *data;
13*e2e2c0f2SLuis Chamberlain unsigned long size;
14*e2e2c0f2SLuis Chamberlain };
15*e2e2c0f2SLuis Chamberlain
1648d09e97SLuis Chamberlain extern struct builtin_fw __start_builtin_fw[];
1748d09e97SLuis Chamberlain extern struct builtin_fw __end_builtin_fw[];
1848d09e97SLuis Chamberlain
fw_copy_to_prealloc_buf(struct firmware * fw,void * buf,size_t size)1948d09e97SLuis Chamberlain static bool fw_copy_to_prealloc_buf(struct firmware *fw,
2048d09e97SLuis Chamberlain void *buf, size_t size)
2148d09e97SLuis Chamberlain {
2248d09e97SLuis Chamberlain if (!buf)
2348d09e97SLuis Chamberlain return true;
2448d09e97SLuis Chamberlain if (size < fw->size)
2548d09e97SLuis Chamberlain return false;
2648d09e97SLuis Chamberlain memcpy(buf, fw->data, fw->size);
2748d09e97SLuis Chamberlain return true;
2848d09e97SLuis Chamberlain }
2948d09e97SLuis Chamberlain
3048d09e97SLuis Chamberlain /**
3148d09e97SLuis Chamberlain * firmware_request_builtin() - load builtin firmware
3248d09e97SLuis Chamberlain * @fw: pointer to firmware struct
3348d09e97SLuis Chamberlain * @name: name of firmware file
3448d09e97SLuis Chamberlain *
3548d09e97SLuis Chamberlain * Some use cases in the kernel have a requirement so that no memory allocator
3648d09e97SLuis Chamberlain * is involved as these calls take place early in boot process. An example is
3748d09e97SLuis Chamberlain * the x86 CPU microcode loader. In these cases all the caller wants is to see
3848d09e97SLuis Chamberlain * if the firmware was built-in and if so use it right away. This can be used
3948d09e97SLuis Chamberlain * for such cases.
4048d09e97SLuis Chamberlain *
4148d09e97SLuis Chamberlain * This looks for the firmware in the built-in kernel. Only if the kernel was
4248d09e97SLuis Chamberlain * built-in with the firmware you are looking for will this return successfully.
4348d09e97SLuis Chamberlain *
4448d09e97SLuis Chamberlain * Callers of this API do not need to use release_firmware() as the pointer to
4548d09e97SLuis Chamberlain * the firmware is expected to be provided locally on the stack of the caller.
4648d09e97SLuis Chamberlain **/
firmware_request_builtin(struct firmware * fw,const char * name)4748d09e97SLuis Chamberlain bool firmware_request_builtin(struct firmware *fw, const char *name)
4848d09e97SLuis Chamberlain {
4948d09e97SLuis Chamberlain struct builtin_fw *b_fw;
5048d09e97SLuis Chamberlain
5148d09e97SLuis Chamberlain if (!fw)
5248d09e97SLuis Chamberlain return false;
5348d09e97SLuis Chamberlain
5448d09e97SLuis Chamberlain for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
5548d09e97SLuis Chamberlain if (strcmp(name, b_fw->name) == 0) {
5648d09e97SLuis Chamberlain fw->size = b_fw->size;
5748d09e97SLuis Chamberlain fw->data = b_fw->data;
5848d09e97SLuis Chamberlain return true;
5948d09e97SLuis Chamberlain }
6048d09e97SLuis Chamberlain }
6148d09e97SLuis Chamberlain
6248d09e97SLuis Chamberlain return false;
6348d09e97SLuis Chamberlain }
6448d09e97SLuis Chamberlain EXPORT_SYMBOL_NS_GPL(firmware_request_builtin, TEST_FIRMWARE);
6548d09e97SLuis Chamberlain
6648d09e97SLuis Chamberlain /**
6748d09e97SLuis Chamberlain * firmware_request_builtin_buf() - load builtin firmware into optional buffer
6848d09e97SLuis Chamberlain * @fw: pointer to firmware struct
6948d09e97SLuis Chamberlain * @name: name of firmware file
7048d09e97SLuis Chamberlain * @buf: If set this lets you use a pre-allocated buffer so that the built-in
7148d09e97SLuis Chamberlain * firmware into is copied into. This field can be NULL. It is used by
7248d09e97SLuis Chamberlain * callers such as request_firmware_into_buf() and
7348d09e97SLuis Chamberlain * request_partial_firmware_into_buf()
7448d09e97SLuis Chamberlain * @size: if buf was provided, the max size of the allocated buffer available.
7548d09e97SLuis Chamberlain * If the built-in firmware does not fit into the pre-allocated @buf this
7648d09e97SLuis Chamberlain * call will fail.
7748d09e97SLuis Chamberlain *
7848d09e97SLuis Chamberlain * This looks for the firmware in the built-in kernel. Only if the kernel was
7948d09e97SLuis Chamberlain * built-in with the firmware you are looking for will this call possibly
8048d09e97SLuis Chamberlain * succeed. If you passed a @buf the firmware will be copied into it *iff* the
8148d09e97SLuis Chamberlain * built-in firmware fits into the pre-allocated buffer size specified in
8248d09e97SLuis Chamberlain * @size.
8348d09e97SLuis Chamberlain *
8448d09e97SLuis Chamberlain * This caller is to be used internally by the firmware_loader only.
8548d09e97SLuis Chamberlain **/
firmware_request_builtin_buf(struct firmware * fw,const char * name,void * buf,size_t size)8648d09e97SLuis Chamberlain bool firmware_request_builtin_buf(struct firmware *fw, const char *name,
8748d09e97SLuis Chamberlain void *buf, size_t size)
8848d09e97SLuis Chamberlain {
8948d09e97SLuis Chamberlain if (!firmware_request_builtin(fw, name))
9048d09e97SLuis Chamberlain return false;
9148d09e97SLuis Chamberlain
9248d09e97SLuis Chamberlain return fw_copy_to_prealloc_buf(fw, buf, size);
9348d09e97SLuis Chamberlain }
9448d09e97SLuis Chamberlain
firmware_is_builtin(const struct firmware * fw)9548d09e97SLuis Chamberlain bool firmware_is_builtin(const struct firmware *fw)
9648d09e97SLuis Chamberlain {
9748d09e97SLuis Chamberlain struct builtin_fw *b_fw;
9848d09e97SLuis Chamberlain
9948d09e97SLuis Chamberlain for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++)
10048d09e97SLuis Chamberlain if (fw->data == b_fw->data)
10148d09e97SLuis Chamberlain return true;
10248d09e97SLuis Chamberlain
10348d09e97SLuis Chamberlain return false;
10448d09e97SLuis Chamberlain }
10548d09e97SLuis Chamberlain
10648d09e97SLuis Chamberlain #endif
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