x86: Support loading kernel setup from a FIT

Add a new setup@ section to the FIT which can be used to provide a setup
binary for booting Linux on x86. This makes it possible to boot x86 from
a FIT.

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

common/bootm.c

@@ -9,6 +9,7 @@
 #include <common.h>
 #include <bootstage.h>
 #include <bzlib.h>
+#include <errno.h>
 #include <fdt_support.h>
 #include <lmb.h>
 #include <malloc.h>
@@ -83,6 +84,7 @@ static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc,
 {
 	const void *os_hdr;
 	bool ep_found = false;
+	int ret;
 
 	/* get kernel image header, start address and length */
 	os_hdr = boot_get_kernel(cmdtp, flag, argc, argv,
@@ -102,6 +104,7 @@ static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc,
 
 		images.os.end = image_get_image_end(os_hdr);
 		images.os.load = image_get_load(os_hdr);
+		images.os.arch = image_get_arch(os_hdr);
 		break;
 #endif
 #if defined(CONFIG_FIT)
@@ -129,6 +132,13 @@ static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc,
 			return 1;
 		}
 
+		if (fit_image_get_arch(images.fit_hdr_os,
+				       images.fit_noffset_os,
+				       &images.os.arch)) {
+			puts("Can't get image ARCH!\n");
+			return 1;
+		}
+
 		images.os.end = fit_get_end(images.fit_hdr_os);
 
 		if (fit_image_get_load(images.fit_hdr_os, images.fit_noffset_os,
@@ -156,8 +166,17 @@ static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc,
 		return 1;
 	}
 
-	/* find kernel entry point */
-	if (images.legacy_hdr_valid) {
+	/* If we have a valid setup.bin, we will use that for entry (x86) */
+	if (images.os.arch == IH_ARCH_I386) {
+		ulong len;
+
+		ret = boot_get_setup(&images, IH_ARCH_I386, &images.ep, &len);
+		if (ret < 0 && ret != -ENOENT) {
+			puts("Could not find a valid setup.bin for x86\n");
+			return 1;
+		}
+		/* Kernel entry point is the setup.bin */
+	} else if (images.legacy_hdr_valid) {
 		images.ep = image_get_ep(&images.legacy_hdr_os_copy);
 #if defined(CONFIG_FIT)
 	} else if (images.fit_uname_os) {

common/cmd_bootm.c

@@ -12,6 +12,7 @@
 #include <bootm.h>
 #include <command.h>
 #include <environment.h>
+#include <errno.h>
 #include <image.h>
 #include <lmb.h>
 #include <malloc.h>

common/image-fit.c

@@ -1497,6 +1497,8 @@ static const char *fit_get_image_type_property(int type)
 		return FIT_KERNEL_PROP;
 	case IH_TYPE_RAMDISK:
 		return FIT_RAMDISK_PROP;
+	case IH_TYPE_X86_SETUP:
+		return FIT_SETUP_PROP;
 	}
 
 	return "unknown";
@@ -1693,3 +1695,23 @@ int fit_image_load(bootm_headers_t *images, ulong addr,
 
 	return noffset;
 }
+
+int boot_get_setup_fit(bootm_headers_t *images, uint8_t arch,
+			ulong *setup_start, ulong *setup_len)
+{
+	int noffset;
+	ulong addr;
+	ulong len;
+	int ret;
+
+	addr = map_to_sysmem(images->fit_hdr_os);
+	noffset = fit_get_node_from_config(images, FIT_SETUP_PROP, addr);
+	if (noffset < 0)
+		return noffset;
+
+	ret = fit_image_load(images, addr, NULL, NULL, arch,
+			     IH_TYPE_X86_SETUP, BOOTSTAGE_ID_FIT_SETUP_START,
+			     FIT_LOAD_REQUIRED, setup_start, &len);
+
+	return ret;
+}

common/image.c

@@ -143,6 +143,7 @@ static const table_entry_t uimage_type[] = {
 	{	IH_TYPE_UBLIMAGE,   "ublimage",   "Davinci UBL image",},
 	{	IH_TYPE_MXSIMAGE,   "mxsimage",   "Freescale MXS Boot Image",},
 	{	IH_TYPE_ATMELIMAGE, "atmelimage", "ATMEL ROM-Boot Image",},
+	{	IH_TYPE_X86_SETUP,  "x86_setup",  "x86 setup.bin",    },
 	{	-1,		    "",		  "",			},
 };
 
@@ -1136,6 +1137,16 @@ error:
 }
 #endif /* CONFIG_SYS_BOOT_RAMDISK_HIGH */
 
+int boot_get_setup(bootm_headers_t *images, uint8_t arch,
+		   ulong *setup_start, ulong *setup_len)
+{
+#if defined(CONFIG_FIT)
+	return boot_get_setup_fit(images, arch, setup_start, setup_len);
+#else
+	return -ENOENT;
+#endif
+}
+
 #ifdef CONFIG_SYS_BOOT_GET_CMDLINE
 /**
  * boot_get_cmdline - allocate and initialize kernel cmdline