cmd_bootm.c: Add 'booti' for ARM64 Linux kernel Images

The default format for arm64 Linux kernels is the "Image" format,
described in Documentation/arm64/booting.txt.  This, along with an
optional gzip compression on top is all that is generated by default.
The Image format has a magic number within the header for verification,
a text_offset where the Image must be run from, an image_size that
includes the BSS and reserved fields.

This does not support automatic detection of a gzip compressed image.

Signed-off-by: Tom Rini <trini@ti.com>

diff --git a/README b/README
index 517b0b4499da94b515de347a70d808ad22f7a178..0a0f528af117e94f86918078b23b7ec8c5561f96 100644 (file)
--- a/README
+++ b/README
@@ -959,6 +959,7 @@ The following options need to be configured:
                CONFIG_CMD_BMP          * BMP support
                CONFIG_CMD_BSP          * Board specific commands
                CONFIG_CMD_BOOTD          bootd
+               CONFIG_CMD_BOOTI        * ARM64 Linux kernel Image support
                CONFIG_CMD_CACHE        * icache, dcache
                CONFIG_CMD_CLK          * clock command support
                CONFIG_CMD_CONSOLE        coninfo

diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 8b897c8d66410db8daa79dda714a0b77635aa0c8..843ec6e0c2696380d176740bbb5864b05e46624b 100644 (file)
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -627,3 +627,143 @@ U_BOOT_CMD(
        "boot Linux zImage image from memory", bootz_help_text
 );
 #endif /* CONFIG_CMD_BOOTZ */
+
+#ifdef CONFIG_CMD_BOOTI
+/* See Documentation/arm64/booting.txt in the Linux kernel */
+struct Image_header {
+       uint32_t        code0;          /* Executable code */
+       uint32_t        code1;          /* Executable code */
+       uint64_t        text_offset;    /* Image load offset, LE */
+       uint64_t        image_size;     /* Effective Image size, LE */
+       uint64_t        res1;           /* reserved */
+       uint64_t        res2;           /* reserved */
+       uint64_t        res3;           /* reserved */
+       uint64_t        res4;           /* reserved */
+       uint32_t        magic;          /* Magic number */
+       uint32_t        res5;
+};
+
+#define LINUX_ARM64_IMAGE_MAGIC        0x644d5241
+
+static int booti_setup(bootm_headers_t *images)
+{
+       struct Image_header *ih;
+       uint64_t dst;
+
+       ih = (struct Image_header *)map_sysmem(images->ep, 0);
+
+       if (ih->magic != le32_to_cpu(LINUX_ARM64_IMAGE_MAGIC)) {
+               puts("Bad Linux ARM64 Image magic!\n");
+               return 1;
+       }
+       
+       if (ih->image_size == 0) {
+               puts("Image lacks image_size field, assuming 16MiB\n");
+               ih->image_size = (16 << 20);
+       }
+
+       /*
+        * If we are not at the correct run-time location, set the new
+        * correct location and then move the image there.
+        */
+       dst = gd->bd->bi_dram[0].start + le32_to_cpu(ih->text_offset);
+       if (images->ep != dst) {
+               void *src;
+
+               debug("Moving Image from 0x%lx to 0x%llx\n", images->ep, dst);
+
+               src = (void *)images->ep;
+               images->ep = dst;
+               memmove((void *)dst, src, le32_to_cpu(ih->image_size));
+       }
+
+       return 0;
+}
+
+/*
+ * Image booting support
+ */
+static int booti_start(cmd_tbl_t *cmdtp, int flag, int argc,
+                       char * const argv[], bootm_headers_t *images)
+{
+       int ret;
+       struct Image_header *ih;
+
+       ret = do_bootm_states(cmdtp, flag, argc, argv, BOOTM_STATE_START,
+                             images, 1);
+
+       /* Setup Linux kernel Image entry point */
+       if (!argc) {
+               images->ep = load_addr;
+               debug("*  kernel: default image load address = 0x%08lx\n",
+                               load_addr);
+       } else {
+               images->ep = simple_strtoul(argv[0], NULL, 16);
+               debug("*  kernel: cmdline image address = 0x%08lx\n",
+                       images->ep);
+       }
+
+       ret = booti_setup(images);
+       if (ret != 0)
+               return 1;
+
+       ih = (struct Image_header *)map_sysmem(images->ep, 0);
+
+       lmb_reserve(&images->lmb, images->ep, le32_to_cpu(ih->image_size));
+
+       /*
+        * Handle the BOOTM_STATE_FINDOTHER state ourselves as we do not
+        * have a header that provide this informaiton.
+        */
+       if (bootm_find_ramdisk_fdt(flag, argc, argv))
+               return 1;
+
+       return 0;
+}
+
+int do_booti(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+       int ret;
+
+       /* Consume 'booti' */
+       argc--; argv++;
+
+       if (booti_start(cmdtp, flag, argc, argv, &images))
+               return 1;
+
+       /*
+        * We are doing the BOOTM_STATE_LOADOS state ourselves, so must
+        * disable interrupts ourselves
+        */
+       bootm_disable_interrupts();
+
+       images.os.os = IH_OS_LINUX;
+       ret = do_bootm_states(cmdtp, flag, argc, argv,
+                             BOOTM_STATE_OS_PREP | BOOTM_STATE_OS_FAKE_GO |
+                             BOOTM_STATE_OS_GO,
+                             &images, 1);
+
+       return ret;
+}
+
+#ifdef CONFIG_SYS_LONGHELP
+static char booti_help_text[] =
+       "[addr [initrd[:size]] [fdt]]\n"
+       "    - boot Linux Image stored in memory\n"
+       "\tThe argument 'initrd' is optional and specifies the address\n"
+       "\tof the initrd in memory. The optional argument ':size' allows\n"
+       "\tspecifying the size of RAW initrd.\n"
+#if defined(CONFIG_OF_LIBFDT)
+       "\tSince booting a Linux kernelrequires a flat device-tree\n"
+       "\ta third argument is required which is the address of the\n"
+       "\tdevice-tree blob. To boot that kernel without an initrd image,\n"
+       "\tuse a '-' for the second argument.\n"
+#endif
+       "";
+#endif
+
+U_BOOT_CMD(
+       booti,  CONFIG_SYS_MAXARGS,     1,      do_booti,
+       "boot arm64 Linux Image image from memory", booti_help_text
+);
+#endif /* CONFIG_CMD_BOOTI */

diff --git a/include/bootm.h b/include/bootm.h
index 4a308d811584378dec6830d1b26600076befbe71..694d6fc080fcc5c1b6759f6e74bdf7ba9a328755 100644 (file)
--- a/include/bootm.h
+++ b/include/bootm.h
@@ -48,7 +48,7 @@ int boot_selected_os(int argc, char * const argv[], int state,
 
 ulong bootm_disable_interrupts(void);
 
-/* This is a special function used by bootz */
+/* This is a special function used by booti/bootz */
 int bootm_find_ramdisk_fdt(int flag, int argc, char * const argv[]);
 
 int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],