[PATCH 1/6] efistub: pass uefi secureboot flag via fdt params

[Chester Lin]

Add a new UEFI parameter: "linux,uefi-secure-boot" in fdt boot params
as other architectures have done in their own boot data. For example,
the boot_params->secure_boot in x86.

Signed-off-by: Chester Lin <c...@suse.com>
---
 drivers/firmware/efi/libstub/fdt.c | 39 +++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/libstub/fdt.c 
b/drivers/firmware/efi/libstub/fdt.c
index 11ecf3c4640e..c9a341e4715f 100644
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -136,6 +136,10 @@ static efi_status_t update_fdt(void *orig_fdt, unsigned 
long orig_fdt_size,
        if (status)
                goto fdt_set_fail;
 
+       status = fdt_setprop_var(fdt, node, "linux,uefi-secure-boot", 
fdt_val32);
+       if (status)
+               goto fdt_set_fail;
+
        if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
                efi_status_t efi_status;
 
@@ -199,6 +203,24 @@ static efi_status_t update_fdt_memmap(void *fdt, struct 
efi_boot_memmap *map)
        return EFI_SUCCESS;
 }
 
+static efi_status_t update_fdt_secboot(void *fdt, u32 secboot)
+{
+       int node = fdt_path_offset(fdt, "/chosen");
+       u32 fdt_val32;
+       int err;
+
+       if (node < 0)
+               return EFI_LOAD_ERROR;
+
+       fdt_val32 = cpu_to_fdt32(secboot);
+
+       err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-secure-boot", 
fdt_val32);
+       if (err)
+               return EFI_LOAD_ERROR;
+
+       return EFI_SUCCESS;
+}
+
 struct exit_boot_struct {
        efi_memory_desc_t       *runtime_map;
        int                     *runtime_entry_count;
@@ -208,6 +230,9 @@ struct exit_boot_struct {
 static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
                                   void *priv)
 {
+       efi_status_t status;
+       enum efi_secureboot_mode secboot_status;
+       u32 secboot_var = 0;
        struct exit_boot_struct *p = priv;
        /*
         * Update the memory map with virtual addresses. The function will also
@@ -217,7 +242,19 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap 
*map,
        efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
                        p->runtime_map, p->runtime_entry_count);
 
-       return update_fdt_memmap(p->new_fdt_addr, map);
+       status = update_fdt_memmap(p->new_fdt_addr, map);
+
+       if (status != EFI_SUCCESS)
+               return status;
+
+       secboot_status = efi_get_secureboot();
+
+       if (secboot_status == efi_secureboot_mode_enabled)
+               secboot_var = 1;
+
+       status = update_fdt_secboot(p->new_fdt_addr, secboot_var);
+
+       return status;
 }
 
 #ifndef MAX_FDT_SIZE
-- 
2.26.1