* Copyright (c) 2020, Linaro Limited
*/
+#define LOG_CATEGORY LOGC_EFI
#include <common.h>
#include <efi_loader.h>
#include <efi_load_initrd.h>
+#include <efi_variable.h>
#include <fs.h>
#include <malloc.h>
#include <mapmem.h>
* Device path defined by Linux to identify the handle providing the
* EFI_LOAD_FILE2_PROTOCOL used for loading the initial ramdisk.
*/
-static const struct efi_initrd_dp dp = {
+static const struct efi_initrd_dp dp_lf2_handle = {
.vendor = {
{
DEVICE_PATH_TYPE_MEDIA_DEVICE,
DEVICE_PATH_SUB_TYPE_VENDOR_PATH,
- sizeof(dp.vendor),
+ sizeof(dp_lf2_handle.vendor),
},
EFI_INITRD_MEDIA_GUID,
},
.end = {
DEVICE_PATH_TYPE_END,
DEVICE_PATH_SUB_TYPE_END,
- sizeof(dp.end),
+ sizeof(dp_lf2_handle.end),
}
};
+static efi_handle_t efi_initrd_handle;
+
/**
- * get_file_size() - retrieve the size of initramfs, set efi status on error
+ * get_initrd_fp() - Get initrd device path from a FilePathList device path
*
- * @dev: device to read from, e.g. "mmc"
- * @part: device partition, e.g. "0:1"
- * @file: name of file
- * @status: EFI exit code in case of failure
+ * @initrd_fp: the final initrd filepath
*
- * Return: size of file
+ * Return: status code. Caller must free initrd_fp
*/
-static loff_t get_file_size(const char *dev, const char *part, const char *file,
- efi_status_t *status)
+static efi_status_t get_initrd_fp(struct efi_device_path **initrd_fp)
{
- loff_t sz = 0;
- int ret;
-
- ret = fs_set_blk_dev(dev, part, FS_TYPE_ANY);
- if (ret) {
- *status = EFI_NO_MEDIA;
- goto out;
- }
+ const efi_guid_t lf2_initrd_guid = EFI_INITRD_MEDIA_GUID;
+ struct efi_device_path *dp = NULL;
- ret = fs_size(file, &sz);
- if (ret) {
- sz = 0;
- *status = EFI_NOT_FOUND;
- goto out;
- }
+ /*
+ * if bootmgr is setup with and initrd, the device path will be
+ * in the FilePathList[] of our load options in Boot####.
+ * The first device path of the multi instance device path will
+ * start with a VenMedia and the initrds will follow.
+ *
+ * If the device path is not found return EFI_INVALID_PARAMETER.
+ * We can then use this specific return value and not install the
+ * protocol, while allowing the boot to continue
+ */
+ dp = efi_get_dp_from_boot(lf2_initrd_guid);
+ if (!dp)
+ return EFI_INVALID_PARAMETER;
-out:
- return sz;
+ *initrd_fp = dp;
+ return EFI_SUCCESS;
}
/**
- * efi_load_file2initrd() - load initial RAM disk
+ * efi_load_file2_initrd() - load initial RAM disk
*
* This function implements the LoadFile service of the EFI_LOAD_FILE2_PROTOCOL
* in order to load an initial RAM disk requested by the Linux kernel stub.
struct efi_device_path *file_path, bool boot_policy,
efi_uintn_t *buffer_size, void *buffer)
{
- char *filespec;
- efi_status_t status = EFI_NOT_FOUND;
- loff_t file_sz = 0, read_sz = 0;
- char *dev, *part, *file;
- char *pos;
- int ret;
+ struct efi_device_path *initrd_fp = NULL;
+ efi_status_t ret = EFI_NOT_FOUND;
+ struct efi_file_handle *f = NULL;
+ efi_uintn_t bs;
EFI_ENTRY("%p, %p, %d, %p, %p", this, file_path, boot_policy,
buffer_size, buffer);
- filespec = strdup(CONFIG_EFI_INITRD_FILESPEC);
- if (!filespec)
- goto out;
- pos = filespec;
-
if (!this || this != &efi_lf2_protocol ||
!buffer_size) {
- status = EFI_INVALID_PARAMETER;
+ ret = EFI_INVALID_PARAMETER;
goto out;
}
- if (file_path->type != dp.end.type ||
- file_path->sub_type != dp.end.sub_type) {
- status = EFI_INVALID_PARAMETER;
+ if (file_path->type != dp_lf2_handle.end.type ||
+ file_path->sub_type != dp_lf2_handle.end.sub_type) {
+ ret = EFI_INVALID_PARAMETER;
goto out;
}
if (boot_policy) {
- status = EFI_UNSUPPORTED;
+ ret = EFI_UNSUPPORTED;
goto out;
}
- /*
- * expect a string with three space separated parts:
- *
- * * a block device type, e.g. "mmc"
- * * a device and partition identifier, e.g. "0:1"
- * * a file path on the block device, e.g. "/boot/initrd.cpio.gz"
- */
- dev = strsep(&pos, " ");
- if (!dev)
+ ret = get_initrd_fp(&initrd_fp);
+ if (ret != EFI_SUCCESS)
goto out;
- part = strsep(&pos, " ");
- if (!part)
- goto out;
- file = strsep(&pos, " ");
- if (!file)
+
+ /* Open file */
+ f = efi_file_from_path(initrd_fp);
+ if (!f) {
+ log_err("Can't find initrd specified in Boot####\n");
+ ret = EFI_NOT_FOUND;
goto out;
+ }
- file_sz = get_file_size(dev, part, file, &status);
- if (!file_sz)
+ /* Get file size */
+ ret = efi_file_size(f, &bs);
+ if (ret != EFI_SUCCESS)
goto out;
- if (!buffer || *buffer_size < file_sz) {
- status = EFI_BUFFER_TOO_SMALL;
- *buffer_size = file_sz;
+ if (!buffer || *buffer_size < bs) {
+ ret = EFI_BUFFER_TOO_SMALL;
+ *buffer_size = bs;
} else {
- ret = fs_set_blk_dev(dev, part, FS_TYPE_ANY);
- if (ret) {
- status = EFI_NO_MEDIA;
- goto out;
- }
-
- ret = fs_read(file, map_to_sysmem(buffer), 0, *buffer_size,
- &read_sz);
- if (ret || read_sz != file_sz)
- goto out;
- *buffer_size = read_sz;
-
- status = EFI_SUCCESS;
+ ret = EFI_CALL(f->read(f, &bs, (void *)(uintptr_t)buffer));
+ *buffer_size = bs;
+ }
+
+out:
+ efi_free_pool(initrd_fp);
+ if (f)
+ EFI_CALL(f->close(f));
+ return EFI_EXIT(ret);
+}
+
+/**
+ * check_initrd() - Determine if the file defined as an initrd in Boot####
+ * load_options device path is present
+ *
+ * Return: status code
+ */
+static efi_status_t check_initrd(void)
+{
+ struct efi_device_path *initrd_fp = NULL;
+ struct efi_file_handle *f;
+ efi_status_t ret;
+
+ ret = get_initrd_fp(&initrd_fp);
+ if (ret != EFI_SUCCESS)
+ goto out;
+
+ /*
+ * If the file is not found, but the file path is set, return an error
+ * and trigger the bootmgr fallback
+ */
+ f = efi_file_from_path(initrd_fp);
+ if (!f) {
+ log_err("Can't find initrd specified in Boot####\n");
+ ret = EFI_NOT_FOUND;
+ goto out;
}
+ EFI_CALL(f->close(f));
+
out:
- free(filespec);
- return EFI_EXIT(status);
+ efi_free_pool(initrd_fp);
+ return ret;
}
/**
* efi_initrd_register() - create handle for loading initial RAM disk
*
* This function creates a new handle and installs a Linux specific vendor
- * device path and an EFI_LOAD_FILE_2_PROTOCOL. Linux uses the device path
+ * device path and an EFI_LOAD_FILE2_PROTOCOL. Linux uses the device path
* to identify the handle and then calls the LoadFile service of the
- * EFI_LOAD_FILE_2_PROTOCOL to read the initial RAM disk.
+ * EFI_LOAD_FILE2_PROTOCOL to read the initial RAM disk.
*
* Return: status code
*/
efi_status_t efi_initrd_register(void)
{
- efi_handle_t efi_initrd_handle = NULL;
efi_status_t ret;
+ /*
+ * Allow the user to continue if Boot#### file path is not set for
+ * an initrd
+ */
+ ret = check_initrd();
+ if (ret == EFI_INVALID_PARAMETER)
+ return EFI_SUCCESS;
+ if (ret != EFI_SUCCESS)
+ return ret;
+
ret = EFI_CALL(efi_install_multiple_protocol_interfaces
(&efi_initrd_handle,
/* initramfs */
- &efi_guid_device_path, &dp,
+ &efi_guid_device_path, &dp_lf2_handle,
/* LOAD_FILE2 */
&efi_guid_load_file2_protocol,
(void *)&efi_lf2_protocol,
return ret;
}
+
+/**
+ * efi_initrd_deregister() - delete the handle for loading initial RAM disk
+ *
+ * This will delete the handle containing the Linux specific vendor device
+ * path and EFI_LOAD_FILE2_PROTOCOL for loading an initrd
+ *
+ * Return: status code
+ */
+void efi_initrd_deregister(void)
+{
+ efi_delete_handle(efi_initrd_handle);
+ efi_initrd_handle = NULL;
+}
projects / J-u-boot.git / blobdiff