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;**************************************************************************** ;* BOOT.ASM ;* ;* THIS IS THE INITAL BOOT ROUTINE FOR TMS470 C++ PROGRAMS. ;* IT MUST BE LINKED AND LOADED WITH ALL C++ PROGRAMS. ;* ;* THIS MODULE PERFORMS THE FOLLOWING ACTIONS: ;* 1) ALLOCATES THE STACK AND INITIALIZES THE STACK POINTER ;* 2) CALLS AUTO-INITIALIZATION ROUTINE ;* 3) CALLS THE FUNCTION MAIN TO START THE C++ PROGRAM ;* 4) CALLS THE STANDARD EXIT ROUTINE ;* ;* THIS MODULE DEFINES THE FOLLOWING GLOBAL SYMBOLS: ;* 1) __stack STACK MEMORY AREA ;* 2) _c_int00 BOOT ROUTINE ;* ;**************************************************************************** .if __TI_TMS470_V7M3__ .thumbfunc _c_int00 .else .armfunc _c_int00 .endif
;**************************************************************************** ;* 16 BIT STATE BOOT ROUTINE * ;****************************************************************************
.global __stack ;*************************************************************** ;* DEFINE THE USER MODE STACK (DEFAULT SIZE IS 512) ;*************************************************************** __stack:.usect ".stack", 0, 4
.global _c_int00
;*************************************************************** ;* FUNCTION DEF: _c_int00 ;*************************************************************** _c_int00: .asmfunc
.if !__TI_TMS470_V7M3__ .if __TI_NEON_SUPPORT__ | __TI_VFP_SUPPORT__ ;*------------------------------------------------------ ;* SETUP PRIVILEGED AND USER MODE ACCESS TO COPROCESSORS ;* 10 AND 11, REQUIRED TO ENABLE NEON/VFP ;* COPROCESSOR ACCESS CONTROL REG ;* BITS [23:22] - CP11, [21:20] - CP10 ;* SET TO 0b11 TO ENABLE USER AND PRIV MODE ACCESS ;*------------------------------------------------------ MRC p15,#0x0,r0,c1,c0,#2 MOV r3,#0xf00000 ORR r0,r0,r3 MCR p15,#0x0,r0,c1,c0,#2
;*------------------------------------------------------ ; SET THE EN BIT, FPEXC[30] TO ENABLE NEON AND VFP ;*------------------------------------------------------ MOV r0,#0x40000000 FMXR FPEXC,r0 .endif
;------------------------------------------------------ ;* SET TO USER MODE ;*------------------------------------------------------ MRS r0, cpsr BIC r0, r0, #0x1F ; CLEAR MODES ORR r0, r0, #0x10 ; SET USER MODE MSR cpsr_cf, r0
;*------------------------------------------------------ ;* CHANGE TO 16 BIT STATE ;*------------------------------------------------------ ADD r0, pc, #1 BX r0
.state16 .endif
;*------------------------------------------------------ ;* INITIALIZE THE USER MODE STACK ;*------------------------------------------------------ LDR r0, c_stack MOV sp, r0 LDR r0, c_STACK_SIZE ADD sp, r0
;*----------------------------------------------------- ;* ALIGN THE STACK TO 64-BITS IF EABI. ;*----------------------------------------------------- .if __TI_EABI_ASSEMBLER MOV r7, sp MOV r0, #0x07 BIC r7, r0 ; Clear upper 3 bits for 64-bit alignment. MOV sp, r7 .endif
;*----------------------------------------------------- ;* SAVE CURRENT STACK POINTER FOR SDP ANALYSIS ;*----------------------------------------------------- LDR r0, c_mf_sp MOV r7, sp STR r7, [r0]
;*------------------------------------------------------ ;* Perform all the required initilizations: ;* - Process BINIT Table ;* - Perform C auto initialization ;* - Call global constructors ;*------------------------------------------------------ BL __TI_auto_init
;*------------------------------------------------------ ;* DONE, LOOP FOREVER ;*------------------------------------------------------ L1: B L1 .endasmfunc
.else ; !.TMS470_16BIS
;**************************************************************************** ;* 32 BIT STATE BOOT ROUTINE * ;****************************************************************************
.global __stack ;*************************************************************** ;* DEFINE THE USER MODE STACK (DEFAULT SIZE IS 512) ;*************************************************************** __stack:.usect ".stack", 0, 4
.global _c_int00 ;*************************************************************** ;* FUNCTION DEF: _c_int00 ;*************************************************************** _c_int00: .asmfunc
.if __TI_NEON_SUPPORT__ | __TI_VFP_SUPPORT__ ;*------------------------------------------------------ ;* SETUP PRIVILEGED AND USER MODE ACCESS TO COPROCESSORS ;* 10 AND 11, REQUIRED TO ENABLE NEON/VFP ;* COPROCESSOR ACCESS CONTROL REG ;* BITS [23:22] - CP11, [21:20] - CP10 ;* SET TO 0b11 TO ENABLE USER AND PRIV MODE ACCESS ;*------------------------------------------------------ MRC p15,#0x0,r0,c1,c0,#2 MOV r3,#0xf00000 ORR r0,r0,r3 MCR p15,#0x0,r0,c1,c0,#2
;*------------------------------------------------------ ; SET THE EN BIT, FPEXC[30] TO ENABLE NEON AND VFP ;*------------------------------------------------------ MOV r0,#0x40000000 FMXR FPEXC,r0 .endif
;*------------------------------------------------------ ;* SET TO USER MODE ;*------------------------------------------------------ MRS r0, cpsr BIC r0, r0, #0x1F ; CLEAR MODES ORR r0, r0, #0x13 ; SET USER MODE MSR cpsr_cf, r0
;*------------------------------------------------------ ;* INITIALIZE THE USER MODE STACK ;*------------------------------------------------------ LDR sp, c_stack LDR r0, c_STACK_SIZE ADD sp, sp, r0
;*----------------------------------------------------- ;* ALIGN THE STACK TO 64-BITS IF EABI. ;*----------------------------------------------------- .if __TI_EABI_ASSEMBLER BIC sp, sp, #0x07 ; Clear upper 3 bits for 64-bit alignment. .endif
;*----------------------------------------------------- ;* SAVE CURRENT STACK POINTER FOR SDP ANALYSIS ;*----------------------------------------------------- LDR r0, c_mf_sp STR sp, [r0]
;*------------------------------------------------------ ;* Perform all the required initilizations: ;* - Process BINIT Table ;* - Perform C auto initialization ;* - Call global constructors ;*------------------------------------------------------ BL __TI_auto_init
