[PATCH v2 8/8] efi_loader: load distro dtb in bootmgr
Heinrich Schuchardt
heinrich.schuchardt at canonical.com
Tue May 28 16:42:52 CEST 2024
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 at canonical.com>
---
v2:
no change
---
include/efi_loader.h | 2 ++
lib/efi_loader/efi_bootmgr.c | 13 +++++++++--
lib/efi_loader/efi_fdt.c | 44 ++++++++++++++++++++++++++++++++++++
3 files changed, 57 insertions(+), 2 deletions(-)
diff --git a/include/efi_loader.h b/include/efi_loader.h
index ab7bed22971..6c993e1a694 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -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 */
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index b08d6e97ea3..68440542a37 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -1249,7 +1249,8 @@ 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();
@@ -1269,6 +1270,10 @@ 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;
+ }
}
/*
@@ -1277,8 +1282,12 @@ 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)
diff --git a/lib/efi_loader/efi_fdt.c b/lib/efi_loader/efi_fdt.c
index 0edf0c1e2fc..86ba00c2bdd 100644
--- a/lib/efi_loader/efi_fdt.c
+++ b/lib/efi_loader/efi_fdt.c
@@ -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);
+}
--
2.43.0
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