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efi_loader: load distro dtb in bootmgr

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If no device-tree is specified, try to load a device-tree from the boot
device use the $fdtfile concatenated to either of the paths '/dtb/', '/',
'/dtb/current/'.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Heinrich Schuchardt 2024-04-26 16:13:21 +02:00
parent 8deb5d855b
commit e91b68fd6b
3 changed files with 57 additions and 2 deletions
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2
include/efi_loader.h
View file

@ -1205,4 +1205,6 @@ efi_status_t efi_load_option_dp_join(struct efi_device_path **dp,
int efi_get_distro_fdt_name(char *fname, int size, int seq);
void efi_load_distro_fdt(void **fdt, efi_uintn_t *fdt_size);
#endif /* _EFI_LOADER_H */

13
lib/efi_loader/efi_bootmgr.c
View file

@ -1253,7 +1253,8 @@ efi_status_t efi_bootmgr_run(void *fdt)
efi_handle_t handle;
void *load_options;
efi_status_t ret;
void *fdt_lo;
void *fdt_lo, *fdt_distro = NULL;
efi_uintn_t fdt_size;
/* Initialize EFI drivers */
ret = efi_init_obj_list();
@ -1275,6 +1276,10 @@ efi_status_t efi_bootmgr_run(void *fdt)
return ret;
if (fdt_lo)
fdt = fdt_lo;
if (!fdt) {
efi_load_distro_fdt(&fdt_distro, &fdt_size);
fdt = fdt_distro;
}
}
/*
@ -1283,8 +1288,12 @@ efi_status_t efi_bootmgr_run(void *fdt)
*/
ret = efi_install_fdt(fdt);
if (!IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE))
if (!IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE)) {
free(fdt_lo);
if (fdt_distro)
efi_free_pages((uintptr_t)fdt_distro,
efi_size_in_pages(fdt_size));
}
if (ret != EFI_SUCCESS) {
if (EFI_CALL(efi_unload_image(handle)) == EFI_SUCCESS)

44
lib/efi_loader/efi_fdt.c
View file

@ -71,3 +71,47 @@ int efi_get_distro_fdt_name(char *fname, int size, int seq)
return 0;
}
/**
* efi_load_distro_fdt() - load distro device-tree
*
* @fdt: on return device-tree, must be freed via efi_free_pages()
* @fdt_size: buffer size
*/
void efi_load_distro_fdt(void **fdt, efi_uintn_t *fdt_size)
{
struct efi_device_path *rem, *dp;
efi_status_t ret;
efi_handle_t device;
*fdt = NULL;
dp = efi_get_dp_from_boot(NULL);
if (!dp)
return;
device = efi_dp_find_obj(dp, NULL, &rem);
ret = efi_search_protocol(device, &efi_simple_file_system_protocol_guid,
NULL);
if (ret != EFI_SUCCESS)
goto err;
memcpy(rem, &END, sizeof(END));
/* try the various available names */
for (int seq = 0; ; ++seq) {
struct efi_device_path *file;
char buf[255];
if (efi_get_distro_fdt_name(buf, sizeof(buf), seq))
break;
file = efi_dp_from_file(dp, buf);
if (!file)
break;
ret = efi_load_image_from_path(true, file, fdt, fdt_size);
efi_free_pool(file);
if (ret == EFI_SUCCESS)
break;
}
err:
efi_free_pool(dp);
}