bootstd: Support reading a script from network or SPI flash

At present this bootmeth only supports a block device and the sandbox
host filesystem. Add support for obtaining the script from a network
device. Also implement the set_bootflow() method so that it is easy
for other bootdevs (such as enabling SPI flash to support scripts).

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

diff --git a/boot/bootmeth_script.c b/boot/bootmeth_script.c
index 7050e45..a14c750 100644 (file)
--- a/boot/bootmeth_script.c
+++ b/boot/bootmeth_script.c
@@ -19,18 +19,14 @@
 #include <image.h>
 #include <malloc.h>
 #include <mapmem.h>
+#include <net.h>
 
 #define SCRIPT_FNAME1  "boot.scr.uimg"
 #define SCRIPT_FNAME2  "boot.scr"
 
 static int script_check(struct udevice *dev, struct bootflow_iter *iter)
 {
-       int ret;
-
-       /* This only works on block devices */
-       ret = bootflow_iter_check_blk(iter);
-       if (ret)
-               return log_msg_ret("blk", ret);
+       /* This works on block devices, network devices and SPI Flash */
 
        return 0;
 }
@@ -65,11 +61,11 @@ static int script_fill_info(struct bootflow *bflow)
        return 0;
 }
 
-static int script_read_bootflow(struct udevice *dev, struct bootflow *bflow)
+static int script_read_bootflow_file(struct udevice *bootstd,
+                                    struct bootflow *bflow)
 {
        struct blk_desc *desc = NULL;
        const char *const *prefixes;
-       struct udevice *bootstd;
        const char *prefix;
        int ret, i;
 
@@ -77,12 +73,12 @@ static int script_read_bootflow(struct udevice *dev, struct bootflow *bflow)
        if (ret)
                return log_msg_ret("std", ret);
 
-       /* We require a partition table */
-       if (!bflow->part)
-               return -ENOENT;
-
-       if (bflow->blk)
+       if (bflow->blk) {
+               /* We require a partition table */
+               if (!bflow->part)
+                       return -ENOENT;
                 desc = dev_get_uclass_plat(bflow->blk);
+       }
 
        prefixes = bootstd_get_prefixes(bootstd);
        i = 0;
@@ -116,6 +112,76 @@ static int script_read_bootflow(struct udevice *dev, struct bootflow *bflow)
        return 0;
 }
 
+static int script_read_bootflow_net(struct bootflow *bflow)
+{
+       const char *addr_str;
+       int size, ret;
+       char *fname;
+       ulong addr;
+
+       /* figure out the load address */
+       addr_str = env_get("scriptaddr");
+       addr = addr_str ? hextoul(addr_str, NULL) : image_load_addr;
+
+       fname = env_get("boot_script_dhcp");
+       if (!fname)
+               return log_msg_ret("dhc", -EINVAL);
+
+       ret = dhcp_run(addr, fname, true);
+       if (ret)
+               return log_msg_ret("dhc", ret);
+
+       size = env_get_hex("filesize", 0);
+       if (!size)
+               return log_msg_ret("sz", -EINVAL);
+
+       bflow->buf = malloc(size + 1);
+       if (!bflow->buf)
+               return log_msg_ret("buf", -ENOMEM);
+       memcpy(bflow->buf, map_sysmem(addr, size), size);
+       bflow->buf[size] = '\0';
+       bflow->size = size;
+       bflow->state = BOOTFLOWST_READY;
+
+       return 0;
+}
+
+static int script_read_bootflow(struct udevice *dev, struct bootflow *bflow)
+{
+       const struct udevice *media = dev_get_parent(bflow->dev);
+       struct udevice *bootstd;
+       int ret;
+
+       ret = uclass_first_device_err(UCLASS_BOOTSTD, &bootstd);
+       if (ret)
+               return log_msg_ret("std", ret);
+
+       if (IS_ENABLED(CONFIG_CMD_DHCP) &&
+           device_get_uclass_id(media) == UCLASS_ETH) {
+               /* we only support reading from one device, so ignore 'dev' */
+               ret = script_read_bootflow_net(bflow);
+               if (ret)
+                       return log_msg_ret("net", ret);
+       } else {
+               ret = script_read_bootflow_file(bootstd, bflow);
+               if (ret)
+                       return log_msg_ret("blk", ret);
+       }
+
+       return 0;
+}
+
+static int script_set_bootflow(struct udevice *dev, struct bootflow *bflow,
+                              char *buf, int size)
+{
+       buf[size] = '\0';
+       bflow->buf = buf;
+       bflow->size = size;
+       bflow->state = BOOTFLOWST_READY;
+
+       return 0;
+}
+
 static int script_boot(struct udevice *dev, struct bootflow *bflow)
 {
        struct blk_desc *desc = dev_get_uclass_plat(bflow->blk);
@@ -162,6 +228,7 @@ static int script_bootmeth_bind(struct udevice *dev)
 static struct bootmeth_ops script_bootmeth_ops = {
        .check          = script_check,
        .read_bootflow  = script_read_bootflow,
+       .set_bootflow   = script_set_bootflow,
        .read_file      = bootmeth_common_read_file,
        .boot           = script_boot,
 };