/**
* prepare_kernel
*
* Prepare and load the Kernel from a concatenated image3 object.
*/
int prepare_kernel(void)
{
void *kernelData, *kernelImage;
uint32_t kernelSize;
loader_context_t ctx;
uintptr_t kernelBase;
kernelImage = get_image3(kImage3TypeKernel);
assert(kernelImage != NULL);
image3_get_tag_data(kernelImage, kImage3TagData, &kernelData, &kernelSize);
assert((kernelData != NULL) && (kernelSize > 0));
assert(!macho_initialize(&ctx, kernelData));
assert(!macho_set_vm_bias(&ctx, KERNEL_VMADDR));
assert((kernelSize = macho_get_vmsize(&ctx)) > 0);
kernelBase =
(uintptr_t) memory_region_reserve(&kernel_region, kernelSize, 0);
printf("Loading kernel at 0x%08x\n", kernelBase, kernelSize);
assert(!macho_file_map(&ctx, kernelBase));
assert(!macho_get_entrypoint(&ctx, &kernel_entrypoint));
kernel_entrypoint =
vtophys(kernel_entrypoint, KERNEL_VMADDR, kernel_region.base);
return true;
}
/**
* dtre_init
*
* Initialize the device tree.
*/
int dtre_init(void)
{
void *dt_image, *dt_data;
if ((dt_image = image3_get_image(kImage3TypeJsonDeviceTree)) == NULL) {
panic("Invalid or missing device tree!\n");
/* NOREACH */
return -1;
}
image3_get_tag_data(dt_image, kImage3TagData, &dt_data, NULL);
if (!parse_jsdt_device_tree(dt_data)) {
panic("Failed to parse device tree!\n");
/* NOREACH */
return -1;
}
return 0;
}
/**
* prepare_devicetree
*
* Prepare and flatten the devicetree.
*/
int prepare_devicetree(void)
{
void *deviceTreeImage, *deviceTreeData;
uint32_t deviceTreeSize, length, pos = 0;
Node *root;
TagPtr tag;
char *xmlRepresentation;
deviceTreeImage = get_image3(kImage3TypeXmlDeviceTree);
assert(deviceTreeImage != NULL);
image3_get_tag_data(deviceTreeImage, kImage3TagData, &deviceTreeData,
&deviceTreeSize);
/* Create root of DT */
DT__Initialize();
root = DT__RootNode();
xmlRepresentation = (char *)deviceTreeData;
/* Enter everything into the DeviceTree. (not mine) */
assert(root);
while (1) {
length = XMLParseNextTag(xmlRepresentation + pos, &tag);
if (length == -1)
break;
pos += length;
if (!tag)
continue;
if (tag->type == kTagTypeDict) {
PopulateDeviceTreeNode(tag, root);
XMLFreeTag(tag);
return true;
}
XMLFreeTag(tag);
}
return false;
}
