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#*****************************************************************************

#*

#*      Project:    Generic include file for ARM startup

#*      Filename:   startup.inc

#*      Date:       11.05.2004

#*      Rights:     Hitex Development Tools GmbH

#*                  Greschbachstr. 12

#*                  76229  Karlsruhe

#*

#****************************************************************************

# *** Startup Code (executed after Reset) ***

# Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs

        .equ    Mode_USR,   0x10

        .equ    Mode_FIQ,   0x11

        .equ    Mode_IRQ,   0x12

        .equ    Mode_SVC,   0x13

        .equ    Mode_ABT,   0x17

        .equ    Mode_UND,   0x1B

        .equ    Mode_SYS,   0x1F

	    .equ	T_BIT, 0x20	   /* when T bit is set, thumb mode active */

        .equ    I_BIT, 0x80        /* when I bit is set, IRQ is disabled */

        .equ    F_BIT, 0x40        /* when F bit is set, FIQ is disabled */

# ---------------------------------------------

# macro definition for stack memory reservation

# ---------------------------------------------

# use this macro to setup the stack

            .macro  setup_stack label1, size, mode_bits

            .lcomm  __range_\label1, (\size - 1) * 4

            .global \label1

            .lcomm  \label1, 4

 		    ldr     r0, adr_\label1

            msr     CPSR_c, \mode_bits

            mov     r13, r0

            .endm

# use this macro to define the label for the setup_stack mcaro!

            .macro  stack_adr label1

adr_\label1:

            .word   \label1

            .endm

# ---------------------------------------------

# copy section

# use this macro to copy a section

# parameters:

# - individual name, used to create labels

# - source pointer

# - destination pointer

# - source pointer + length > end address of source

# ---------------------------------------------

            .macro  copy_section sec_name, source, destination, source_end

            ldr     R1, =\source

            ldr     R2, =\destination

            ldr     R3, =\source_end

_cplp_\sec_name:

            cmp     R1, R3

            ldrlo   R0, [R1], #4

            strlo   R0, [R2], #4

            blo     _cplp_\sec_name

            .endm

# ---------------------------------------------

# copy section 2

# use this macro to copy a section

# parameters:

# - individual name, used to create labels

# - source pointer

# - destination pointer

# - destination pointer + length > end address of destination

# ---------------------------------------------

            .macro  copy_section2 sec_name, source, destination, destination_end

            ldr     R1, =\source

            ldr     R2, =\destination

            ldr     R3, =\destination_end

_cplp_\sec_name:

            cmp     R2, R3

            ldrlo   R0, [R1], #4

            strlo   R0, [R2], #4

            blo     _cplp_\sec_name

            .endm

# ---------------------------------------------

# clear section

# use this macro to clear bss sections

# ---------------------------------------------

            .macro  clear_section sec_name, source, source_end

            mov     R0, #0

            ldr     R1, =\source

	        ldr     R2, =\source_end

_cllp_\sec_name:

            cmp     R1, R2

            strlo   R0, [R1], #4

	        blo     _cllp_\sec_name

            .endm

# ---------------------------------------------

# examples how to use the macros

# ---------------------------------------------

# Setup stacks for the operating modes

# ---------------------------------------------

#            setup_stack  UND_Stack, UND_Stack_Size, #Mode_UND|I_BIT|F_BIT

#            setup_stack  SVC_Stack, SVC_Stack_Size, #Mode_SVC|I_BIT|F_BIT

#            setup_stack  ABT_Stack, ABT_Stack_Size, #Mode_ABT|I_BIT|F_BIT

#            setup_stack  FIQ_Stack, FIQ_Stack_Size, #Mode_FIQ|I_BIT|F_BIT

#            setup_stack  IRQ_Stack, IRQ_Stack_Size, #Mode_IRQ|I_BIT|F_BIT

#            setup_stack  USR_Stack, USR_Stack_Size, #Mode_USR

# ---------------------------------------------

# copy sections

# ---------------------------------------------

# copy code into internal ram

#            copy_section code, __code_start__, RAM_Base_Boot, __code_end__

# Relocate .data section (Copy from ROM to RAM)

#            copy_section data, __data_start__, __data_start__+RAM_Base_Boot, __data_end__

# ---------------------------------------------

# Clear .bss section

# ---------------------------------------------

# Clear .bss section (Zero init)

#            clear_section bss, __bss_start__, __bss_end__

# ---------------------------------------------

# startup delay

# use this macro if you are working with an debugger

# the startup delay avoid problems while

# the application start before the debug interface

# becomes controled by the debugger

# ---------------------------------------------

# a goodf choice for the delay value is

# cpu clock / 100 with ATMEL controllers

# cpu clock / 40  with Philips controllers

            .macro  StartupDelay delay_value

            ldr     R1, =\delay_value

            ldr     R2, =0

__StartDelay:

            sub     R1, R1, #1

            cmp     R1, R2

            bhi     __StartDelay

            .endm

# ---------------------------------------------