sillicon graphics octane2の仕様（PROM編）
octane2のファームウェア（PROM）は、ARC firmware environmentを独自拡張したもの。
詳細はARC - LinuxMIPSに書いてある通りだが、オリジナルの規格に対し
などの違いがある模様。
sgi PROMとARC APIでお話出来るarcloadを使って少々解析を試みた。
SystemParameterBlock 0xFFFFFFFFA0001000
typedef struct { ULONG SPBSignature; ULONG SPBLength; USHORT Version; USHORT Revision; RESTARTBLOCK *RestartBlock; VOID *DebugBlock; VOID *GEVector; VOID *UTLBMissVector; ULONG FirmwareVectorLength; FIRMWAREVECTOR *FirmwareVector; ULONG PrivateVectorLength; VOID *PrivateVector; ULONG AdapterCount; ADAPTER Adapters[1]; } SPB;
このうち、FirmwareVectorを使ってARC APIと会話しているらしい。
SystemParameterBlock->FirmwareVector 0xa800000000001800
typedef struct { LONG(*Load) (CHAR *, ULONG, ULONG *, ULONG *); LONG(*Invoke) (ULONG, ULONG, ULONG, CHAR *[], CHAR *[]); LONG(*Execute) (CHAR *, ULONG, CHAR *[], CHAR *[]); VOID(*Halt) (VOID); VOID(*PowerDown) (VOID); VOID(*Restart) (VOID); VOID(*Reboot) (VOID); VOID(*EnterInteractiveMode) (VOID); VOID *reserved1; COMPONENT *(*GetPeer) (COMPONENT *); COMPONENT *(*GetChild) (COMPONENT *); COMPONENT *(*GetParent) (COMPONENT *); LONG(*GetConfigurationData) (VOID *, COMPONENT *); COMPONENT *(*AddChild) (COMPONENT *, COMPONENT *, VOID *); LONG(*DeleteComponent) (COMPONENT *); COMPONENT *(*GetComponent) (CHAR *); LONG(*SaveConfiguration) (VOID); SYSTEMID *(*GetSystemId) (VOID); MEMORYDESCRIPTOR *(*GetMemoryDescriptor) (MEMORYDESCRIPTOR *); VOID *reserved2; TIMEINFO *(*GetTime) (VOID); ULONG(*GetRelativeTime) (VOID); LONG(*GetDirectoryEntry) (ULONG, DIRECTORYENTRY *, ULONG, ULONG *); LONG(*Open) (CHAR *, OPENMODE, ULONG *); LONG(*Close) (ULONG); LONG(*Read) (ULONG, VOID *, ULONG, ULONG *); LONG(*GetReadStatus) (ULONG); LONG(*Write) (ULONG, VOID *, ULONG, ULONG *); LONG(*Seek) (ULONG, LARGEINTEGER *, SEEKMODE); LONG(*Mount) (CHAR *, MOUNTOPERATION); CHAR *(*GetEnvironmentVariable) (CHAR *); LONG(*SetEnvironmentVariable) (CHAR *, CHAR *); LONG(*GetFileInformation) (ULONG, FILEINFORMATION *); LONG(*SetFileInformation) (ULONG, ULONG, ULONG); VOID(*FlushAllCaches) (VOID); LONG(*TestUnicodeCharacter) (ULONG, USHORT); DISPLAY_STATUS *(*GetDisplayStatus) (ULONG); } FIRMWAREVECTOR;
printf()とかputc()とかはどこ？
ファイルディスクリプタ0, 1でread(), write()するとコンソールと会話出来るらしい。
その名前はSTDIN, STDOUTとなっていて、この考え方はUNIXと同じ。
#define ARC_STDIN 0 #define ARC_STDOUT 1 static FILE arc_stdin = ARC_STDIN; FILE *stdin = &arc_stdin; static FILE arc_stdout = ARC_STDOUT; FILE *stdout = &arc_stdout; LONG ArcWrite(ULONG FileID, VOID * Buffer, ULONG N, ULONG * Count) { return FVector->Write(FileID, Buffer, N, Count); } int fputs(const char *s, FILE * stream) { LONG status; ULONG count; if (strlen(s) > 0) { status = ArcWrite(*stream, (char *) s, strlen(s), &count); if ((status != ESUCCESS) || (count != strlen(s))) return EOF; } return 0; } int puts(const char *s) { int status = fputs(s, stdout); if (status != EOF) status = fputs("\n\r", stdout); return status; }
