Ramdisk (iBoot command)

Description
A command found in iBoot, iBSS, and iBEC that verifies and preps a ramdisk image which has been previously uploaded.

Decompilation
iPhone 3GS 8920x from iBoot-636.66 unsigned int* gRamdiskSize; unsigned char** gRamdiskAddr; int cmd_ramdisk(int argc, CmdArg* argv) { if(argc > 3 || !strcmp("help", argv[1].string)) { printf("usage:\n\t%s [ ] [ ]\n", argv[0].string); return -1; } 	unsigned int filesize = (unsigned int) nvram_getint("filesize", 0); unsigned char* loadaddr = (unsigned char*) nvram_getint("loadaddr", kLoadAddress); if(filesize == 0) { printf("filesize variable invalid or not set, aborting\n"); return -1; } 	if(range_check(loadaddr, filesize) == 0) { printf("Permission Denied\n"); return -1; } 	MemzDescriptor* memz = memz_create(loadaddr, filesize, 0); if(memz == NULL) { printf("Ramdisk image not valid\n"); return -1; } 	if(memz->imageSize > kRamdiskMaxSize) { printf("Ramdisk too large\n"); return -1; } 	*gRamdiskAddr = kRamdiskAddress; *gRamdiskSize = memz->imageSize; if(image_load(memz, kRamdiskImageType, gRamdiskAddr, gRamdiskSize) >= 0) { printf("creating ramdisk at 0x%x of size 0x%x, from image at 0x%x\n", gRamdiskAddr, gRamdiskSize, loadaddr); return 0; } 	*gRamdiskAddr = 0; *gRamdiskSize = 0; return -1; }
 * 1) define kLoadAddress 0x41000000
 * 2) define kRamdiskMaxSize 0x2000000
 * 3) define kRamdiskAddress 0x44000000
 * 4) define kRamdiskImageType 0x7264736B