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This instruction, located at memory address 0x0000, means: load the value 0xFFFE to the register вЂ SPвЂ (the stack pointer register). LetвЂ™s take a look at the first instruction executed by the program: Besides this, the program does some other less obvious things. The purpose of the bootstrap program is to scroll the Nintendo logo from the top of the screen and play a couple of вЂbeepвЂ™ sounds. That is, donвЂ™t worry if not everything is crystal clear.

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Although we will study the code at a considerable level of detail, at some point, too much detail would mean too much effort for little extra reward and a loss of the main goal of the exercise: get used to the Game BoyвЂ™s way of doing things. We will make further comments to the code because we want to be sure to capture the essence of this exercise. Every time the console is turned on, this special, 256-byte program, is mapped to the beginning of the Game BoyвЂ™s Address Space, the Program Counter Register (вЂPCвЂ™) is set to 0x0000 and the вЂreal stuffвЂ™ begins.Д«ooting the Game Boy with the RealBoy Emulator do_execve_ us study the Game BoyвЂ™s bootstrap. gpfs_filemap_nopage_internal+0x279/0x4f0 _Z9lockFile2P15KernelOperation17OperationLockMode7FileUIDN5LkObj12LockModeEnumES4_PP8OpenFileP10WhatLockediPj+0x2ca/0x570

_Z13lockFileHeldMP15KernelOperationP8OpenFile7FileUIDN5LkObj12LockModeEnumEiPj+0xc1/0x520 ? _ZN19NotGlobalMutexClass12kAcquireSlowEv+0x17d/0x270 _ZN5LkObj10lock_vfs_mEP8CacheObjNS_12LockModeEnumEiPj+0x33e/0x7c0

Hardware name: HPE ProLiant Dе…ѓ60 Gen10/ProLiant Dе…ѓ60 Gen10, BIOS U32 drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm crct10dif_pclmul mlx5_core crct10dif_common crc32c_intel drm ahci smartpqi libahci tg3 scsi_transport_sas libata devlink ptp i2c_core pps_core uas usb_storage Modules linked in: tcp_lp fuse joydev mmfs26(OE) mmfslinux(OE) tracedev(OE) rpcrdma ib_isert iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp scsi_tgt bonding ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm mlx5_ib dm_mirror ib_core dm_region_hash dm_log dm_mod vfat fat skx_edac edac_core intel_powerclamp coretemp intel_rapl iosf_mbi kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd pcspkr cdc_eem usbnet mii ses enclosure hpwdt mei_me hpilo mei sg shpchp lpc_ich ipmi_si ipmi_devintf ipmi_msghandler wmi acpi_power_meter nfsd binfmt_misc auth_rpcgss nfs_acl lockd grace sunrpc ip_tables ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_generic sr_mod cdrom mgag200 i2c_algo_bit kernel BUG at /usr/lpp/mmfs/src/gpl-linux/cxiSystem.c:2724! kp 24881: cxiPanic: ShHashV.C:1367:0:0:FFFFFFFFC0BCD200:LkObj::uXferMmapStartL: eff_token_mode ro and lm_want rf:TokenPermits(get_token_mode(), lm_want) GPFS logAssertFailed: TokenPermits(get_token_mode(), lm_want) file /project/spreltac504/build/rtac504s002a/src/avs/fs/mmfs/ts/kernext/ShHashV.C line 1367 Perf: interrupt took too long (7804 > 7768), lowering kernel.perf_event_max_sample_rate to 25000

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