;------------------------------------------------------------------------------- ; sys_core.asm ; ; (c) Texas Instruments 2009-2013, All rights reserved. ; .text .arm ;------------------------------------------------------------------------------- ; Initialize CPU Registers .def _coreInitRegisters_ .asmfunc _coreInitRegisters_ ; After reset, the CPU is in the Supervisor mode (M = 10011) mov r0, lr mov r1, #0x0000 mov r2, #0x0000 mov r3, #0x0000 mov r4, #0x0000 mov r5, #0x0000 mov r6, #0x0000 mov r7, #0x0000 mov r8, #0x0000 mov r9, #0x0000 mov r10, #0x0000 mov r11, #0x0000 mov r12, #0x0000 mov r13, #0x0000 mrs r1, cpsr msr spsr_cxsf, r1 ; Switch to FIQ mode (M = 10001) cps #17 mov lr, r0 mov r8, #0x0000 mov r9, #0x0000 mov r10, #0x0000 mov r11, #0x0000 mov r12, #0x0000 mrs r1, cpsr msr spsr_cxsf, r1 ; Switch to IRQ mode (M = 10010) cps #18 mov lr, r0 mrs r1,cpsr msr spsr_cxsf, r1 ; Switch to Abort mode (M = 10111) cps #23 mov lr, r0 mrs r1,cpsr msr spsr_cxsf, r1 ; Switch to Undefined Instruction Mode (M = 11011) cps #27 mov lr, r0 mrs r1,cpsr msr spsr_cxsf, r1 ; Switch to System Mode ( Shares User Mode registers ) (M = 11111) cps #31 mov lr, r0 mrs r1,cpsr msr spsr_cxsf, r1 ; Switch back to Supervisor Mode (M = 10011) cps #19 mrc p15, #0x00, r2, c1, c0, #0x02 orr r2, r2, #0xF00000 mcr p15, #0x00, r2, c1, c0, #0x02 mov r2, #0x40000000 fmxr fpexc, r2 fmdrr d0, r1, r1 fmdrr d1, r1, r1 fmdrr d2, r1, r1 fmdrr d3, r1, r1 fmdrr d4, r1, r1 fmdrr d5, r1, r1 fmdrr d6, r1, r1 fmdrr d7, r1, r1 fmdrr d8, r1, r1 fmdrr d9, r1, r1 fmdrr d10, r1, r1 fmdrr d11, r1, r1 fmdrr d12, r1, r1 fmdrr d13, r1, r1 fmdrr d14, r1, r1 fmdrr d15, r1, r1 bl next1 next1 bl next2 next2 bl next3 next3 bl next4 next4 bx r0 .endasmfunc ;------------------------------------------------------------------------------- ; Initialize Stack Pointers .def _coreInitStackPointer_ .asmfunc _coreInitStackPointer_ cps #17 ldr sp, fiqSp cps #18 ldr sp, irqSp cps #23 ldr sp, abortSp cps #27 ldr sp, undefSp cps #31 ldr sp, userSp cps #19 ldr sp, svcSp bx lr userSp .word 0x08000000+0x00001000 svcSp .word 0x08000000+0x00001000+0x00000100 fiqSp .word 0x08000000+0x00001000+0x00000100+0x00000100 irqSp .word 0x08000000+0x00001000+0x00000100+0x00000100+0x00000100 abortSp .word 0x08000000+0x00001000+0x00000100+0x00000100+0x00000100+0x00000100 undefSp .word 0x08000000+0x00001000+0x00000100+0x00000100+0x00000100+0x00000100+0x00000100 .endasmfunc ;------------------------------------------------------------------------------- ; Get CPSR Value .def _getCPSRValue_ .asmfunc _getCPSRValue_ mrs r0, CPSR bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Take CPU to IDLE state .def _gotoCPUIdle_ .asmfunc _gotoCPUIdle_ WFI nop nop nop nop bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Enable VFP Unit .def _coreEnableVfp_ .asmfunc _coreEnableVfp_ mrc p15, #0x00, r0, c1, c0, #0x02 orr r0, r0, #0xF00000 mcr p15, #0x00, r0, c1, c0, #0x02 mov r0, #0x40000000 fmxr fpexc, r0 bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Enable Event Bus Export .def _coreEnableEventBusExport_ .asmfunc _coreEnableEventBusExport_ stmfd sp!, {r0} mrc p15, #0x00, r0, c9, c12, #0x00 orr r0, r0, #0x10 mcr p15, #0x00, r0, c9, c12, #0x00 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Disable Event Bus Export .def _coreDisableEventBusExport_ .asmfunc _coreDisableEventBusExport_ stmfd sp!, {r0} mrc p15, #0x00, r0, c9, c12, #0x00 bic r0, r0, #0x10 mcr p15, #0x00, r0, c9, c12, #0x00 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Enable RAM ECC Support .def _coreEnableRamEcc_ .asmfunc _coreEnableRamEcc_ stmfd sp!, {r0} mrc p15, #0x00, r0, c1, c0, #0x01 orr r0, r0, #0x0C000000 mcr p15, #0x00, r0, c1, c0, #0x01 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Disable RAM ECC Support .def _coreDisableRamEcc_ .asmfunc _coreDisableRamEcc_ stmfd sp!, {r0} mrc p15, #0x00, r0, c1, c0, #0x01 bic r0, r0, #0x0C000000 mcr p15, #0x00, r0, c1, c0, #0x01 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Enable Flash ECC Support .def _coreEnableFlashEcc_ .asmfunc _coreEnableFlashEcc_ stmfd sp!, {r0} mrc p15, #0x00, r0, c1, c0, #0x01 orr r0, r0, #0x02000000 dmb mcr p15, #0x00, r0, c1, c0, #0x01 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Disable Flash ECC Support .def _coreDisableFlashEcc_ .asmfunc _coreDisableFlashEcc_ stmfd sp!, {r0} mrc p15, #0x00, r0, c1, c0, #0x01 bic r0, r0, #0x02000000 mcr p15, #0x00, r0, c1, c0, #0x01 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Enable Offset via Vic controller .def _coreEnableIrqVicOffset_ .asmfunc _coreEnableIrqVicOffset_ stmfd sp!, {r0} mrc p15, #0, r0, c1, c0, #0 orr r0, r0, #0x01000000 mcr p15, #0, r0, c1, c0, #0 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Get data fault status register .def _coreGetDataFault_ .asmfunc _coreGetDataFault_ mrc p15, #0, r0, c5, c0, #0 bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Clear data fault status register .def _coreClearDataFault_ .asmfunc _coreClearDataFault_ stmfd sp!, {r0} mov r0, #0 mcr p15, #0, r0, c5, c0, #0 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Get instruction fault status register .def _coreGetInstructionFault_ .asmfunc _coreGetInstructionFault_ mrc p15, #0, r0, c5, c0, #1 bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Clear instruction fault status register .def _coreClearInstructionFault_ .asmfunc _coreClearInstructionFault_ stmfd sp!, {r0} mov r0, #0 mcr p15, #0, r0, c5, c0, #1 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Get data fault address register .def _coreGetDataFaultAddress_ .asmfunc _coreGetDataFaultAddress_ mrc p15, #0, r0, c6, c0, #0 bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Clear data fault address register .def _coreClearDataFaultAddress_ .asmfunc _coreClearDataFaultAddress_ stmfd sp!, {r0} mov r0, #0 mcr p15, #0, r0, c6, c0, #0 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Get instruction fault address register .def _coreGetInstructionFaultAddress_ .asmfunc _coreGetInstructionFaultAddress_ mrc p15, #0, r0, c6, c0, #2 bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Clear instruction fault address register .def _coreClearInstructionFaultAddress_ .asmfunc _coreClearInstructionFaultAddress_ stmfd sp!, {r0} mov r0, #0 mcr p15, #0, r0, c6, c0, #2 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Get auxiliary data fault status register .def _coreGetAuxiliaryDataFault_ .asmfunc _coreGetAuxiliaryDataFault_ mrc p15, #0, r0, c5, c1, #0 bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Clear auxiliary data fault status register .def _coreClearAuxiliaryDataFault_ .asmfunc _coreClearAuxiliaryDataFault_ stmfd sp!, {r0} mov r0, #0 mcr p15, #0, r0, c5, c1, #0 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Get auxiliary instruction fault status register .def _coreGetAuxiliaryInstructionFault_ .asmfunc _coreGetAuxiliaryInstructionFault_ mrc p15, #0, r0, c5, c1, #1 bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Clear auxiliary instruction fault status register .def _coreClearAuxiliaryInstructionFault_ .asmfunc _coreClearAuxiliaryInstructionFault_ stmfd sp!, {r0} mov r0, #0 mrc p15, #0, r0, c5, c1, #1 ldmfd sp!, {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Disable interrupts - R4 IRQ & FIQ .def _disable_interrupt_ .asmfunc _disable_interrupt_ cpsid if bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Disable FIQ interrupt .def _disable_FIQ_interrupt_ .asmfunc _disable_FIQ_interrupt_ cpsid f bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Disable FIQ interrupt .def _disable_IRQ_interrupt_ .asmfunc _disable_IRQ_interrupt_ cpsid i bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Enable interrupts - R4 IRQ & FIQ .def _enable_interrupt_ .asmfunc _enable_interrupt_ cpsie if bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Clear ESM CCM errorss .def _esmCcmErrorsClear_ .asmfunc _esmCcmErrorsClear_ stmfd sp!, {r0-r2} ldr r0, ESMSR1_REG ; load the ESMSR1 status register address ldr r2, ESMSR1_ERR_CLR str r2, [r0] ; clear the ESMSR1 register ldr r0, ESMSR2_REG ; load the ESMSR2 status register address ldr r2, ESMSR2_ERR_CLR str r2, [r0] ; clear the ESMSR2 register ldr r0, ESMSSR2_REG ; load the ESMSSR2 status register address ldr r2, ESMSSR2_ERR_CLR str r2, [r0] ; clear the ESMSSR2 register ldr r0, ESMKEY_REG ; load the ESMKEY register address mov r2, #0x5 ; load R2 with 0x5 str r2, [r0] ; clear the ESMKEY register ldr r0, VIM_INTREQ ; load the INTREQ register address ldr r2, VIM_INT_CLR str r2, [r0] ; clear the INTREQ register ldr r0, CCMR4_STAT_REG ; load the CCMR4 status register address ldr r2, CCMR4_ERR_CLR str r2, [r0] ; clear the CCMR4 status register ldmfd sp!, {r0-r2} bx lr ESMSR1_REG .word 0xFFFFF518 ESMSR2_REG .word 0xFFFFF51C ESMSR3_REG .word 0xFFFFF520 ESMKEY_REG .word 0xFFFFF538 ESMSSR2_REG .word 0xFFFFF53C CCMR4_STAT_REG .word 0xFFFFF600 ERR_CLR_WRD .word 0xFFFFFFFF CCMR4_ERR_CLR .word 0x00010000 ESMSR1_ERR_CLR .word 0x80000000 ESMSR2_ERR_CLR .word 0x00000004 ESMSSR2_ERR_CLR .word 0x00000004 VIM_INT_CLR .word 0x00000001 VIM_INTREQ .word 0xFFFFFE20 .endasmfunc ;------------------------------------------------------------------------------- ; Work Around for Errata CORTEX-R4#57: ; ; Errata Description: ; Conditional VMRS APSR_Nzcv, FPSCR May Evaluate With Incorrect Flags ; Workaround: ; Disable out-of-order single-precision floating point ; multiply-accumulate instruction completion .def _errata_CORTEXR4_57_ .asmfunc _errata_CORTEXR4_57_ push {r0} mrc p15, #0, r0, c15, c0, #0 ; Read Secondary Auxiliary Control Register orr r0, r0, #0x10000 ; Set BIT 16 (Set DOOFMACS) mcr p15, #0, r0, c15, c0, #0 ; Write Secondary Auxiliary Control Register pop {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; Work Around for Errata CORTEX-R4#66: ; ; Errata Description: ; Register Corruption During A Load-Multiple Instruction At ; an Exception Vector ; Workaround: ; Disable out-of-order completion for divide instructions in ; Auxiliary Control register .def _errata_CORTEXR4_66_ .asmfunc _errata_CORTEXR4_66_ push {r0} mrc p15, #0, r0, c1, c0, #1 ; Read Auxiliary Control register orr r0, r0, #0x80 ; Set BIT 7 (Disable out-of-order completion ; for divide instructions.) mcr p15, #0, r0, c1, c0, #1 ; Write Auxiliary Control register pop {r0} bx lr .endasmfunc ;------------------------------------------------------------------------------- ; C++ construct table pointers .def __TI_PINIT_Base, __TI_PINIT_Limit .weak SHT$$INIT_ARRAY$$Base, SHT$$INIT_ARRAY$$Limit __TI_PINIT_Base .long SHT$$INIT_ARRAY$$Base __TI_PINIT_Limit .long SHT$$INIT_ARRAY$$Limit ;-------------------------------------------------------------------------------