bootstd: Allow bootmeths to be marked as global

The current way of handling things like EFI bootmgr is a bit odd, since
that bootmeth handles selection of the bootdev itself. VBE needs to work
the same way, so we should support it properly.

Add a flag that indicates that the bootmeth is global, rather than being
invoked on each bootdev. Provide a helper to read a bootflow from the
bootmeth.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/boot/Kconfig b/boot/Kconfig
index a294ad7..b8db8cd 100644 (file)
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -349,6 +349,13 @@ config BOOTSTD_BOOTCOMMAND
          standard boot does not support all of the features of distro boot
          yet.
 
+config BOOTMETH_GLOBAL
+       bool
+       help
+         Add support for global bootmeths. This feature is used by VBE and
+         EFI bootmgr, since they take full control over which bootdevs are
+         selected to boot.
+
 config BOOTMETH_DISTRO
        bool "Bootdev support for distro boot"
        select PXE_UTILS

diff --git a/boot/bootmeth-uclass.c b/boot/bootmeth-uclass.c
index 1e276c0..88bbb32 100644 (file)
--- a/boot/bootmeth-uclass.c
+++ b/boot/bootmeth-uclass.c
@@ -71,6 +71,20 @@ int bootmeth_read_file(struct udevice *dev, struct bootflow *bflow,
        return ops->read_file(dev, bflow, file_path, addr, sizep);
 }
 
+int bootmeth_get_bootflow(struct udevice *dev, struct bootflow *bflow)
+{
+       const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
+
+       if (!ops->read_bootflow)
+               return -ENOSYS;
+       memset(bflow, '\0', sizeof(*bflow));
+       bflow->dev = NULL;
+       bflow->method = dev;
+       bflow->state = BOOTFLOWST_BASE;
+
+       return ops->read_bootflow(dev, bflow);
+}
+
 /**
  * bootmeth_setup_iter_order() - Set up the ordering of bootmeths to scan
  *

diff --git a/boot/bootmeth_efi_mgr.c b/boot/bootmeth_efi_mgr.c
index a691446..08d9328 100644 (file)
--- a/boot/bootmeth_efi_mgr.c
+++ b/boot/bootmeth_efi_mgr.c
@@ -61,6 +61,7 @@ static int bootmeth_efi_mgr_bind(struct udevice *dev)
        struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
 
        plat->desc = "EFI bootmgr flow";
+       plat->flags = BOOTMETHF_GLOBAL;
 
        return 0;
 }
@@ -77,7 +78,7 @@ static const struct udevice_id efi_mgr_bootmeth_ids[] = {
        { }
 };
 
-U_BOOT_DRIVER(bootmeth_zefi_mgr) = {
+U_BOOT_DRIVER(bootmeth_efi_mgr) = {
        .name           = "bootmeth_efi_mgr",
        .id             = UCLASS_BOOTMETH,
        .of_match       = efi_mgr_bootmeth_ids,

diff --git a/cmd/bootmeth.c b/cmd/bootmeth.c
index c9a27fe..9fbcccd 100644 (file)
--- a/cmd/bootmeth.c
+++ b/cmd/bootmeth.c
@@ -69,7 +69,9 @@ static int do_bootmeth_list(struct cmd_tbl *cmdtp, int flag, int argc,
                        }
                }
 
-               if (order == -1)
+               if (ucp->flags & BOOTMETHF_GLOBAL)
+                       printf("%5s", "glob");
+               else if (order == -1)
                        printf("%5s", "-");
                else
                        printf("%5x", order);

diff --git a/include/bootmeth.h b/include/bootmeth.h
index 4967031..c93367b 100644 (file)
--- a/include/bootmeth.h
+++ b/include/bootmeth.h
@@ -13,12 +13,23 @@ struct bootflow_iter;
 struct udevice;
 
 /**
+ * enum bootmeth_flags - Flags for bootmeths
+ *
+ * @BOOTMETHF_GLOBAL: bootmeth handles bootdev selection automatically
+ */
+enum bootmeth_flags {
+       BOOTMETHF_GLOBAL        = BIT(0),
+};
+
+/**
  * struct bootmeth_uc_plat - information the uclass keeps about each bootmeth
  *
  * @desc: A long description of the bootmeth
+ * @flags: Flags for this bootmeth (enum bootmeth_flags)
  */
 struct bootmeth_uc_plat {
        const char *desc;
+       int flags;
 };
 
 /** struct bootmeth_ops - Operations for boot methods */
@@ -267,4 +278,16 @@ int bootmeth_alloc_file(struct bootflow *bflow, uint size_limit, uint align);
 int bootmeth_common_read_file(struct udevice *dev, struct bootflow *bflow,
                              const char *file_path, ulong addr, ulong *sizep);
 
+/**
+ * bootmeth_get_bootflow() - Get a bootflow from a global bootmeth
+ *
+ * Check the bootmeth for a bootflow which can be used. In this case the
+ * bootmeth handles all bootdev selection, etc.
+ *
+ * @dev: bootmeth device to read from
+ * @bflow: Bootflow information
+ * @return 0 on success, -ve if a bootflow could not be found or had an error
+ */
+int bootmeth_get_bootflow(struct udevice *dev, struct bootflow *bflow);
+
 #endif

diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index e3f2402..5cfff8c 100644 (file)
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -37,6 +37,7 @@ if EFI_LOADER
 config CMD_BOOTEFI_BOOTMGR
        bool "UEFI Boot Manager"
        default y
+       select BOOTMETH_GLOBAL if BOOTSTD
        help
          Select this option if you want to select the UEFI binary to be booted
          via UEFI variables Boot####, BootOrder, and BootNext. This enables the