diff options
Diffstat (limited to 'uc_str912/prj_test_lcd/src/startup.s')
| -rw-r--r-- | uc_str912/prj_test_lcd/src/startup.s | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/uc_str912/prj_test_lcd/src/startup.s b/uc_str912/prj_test_lcd/src/startup.s new file mode 100644 index 0000000..cef54d8 --- /dev/null +++ b/uc_str912/prj_test_lcd/src/startup.s @@ -0,0 +1,233 @@ +/***********************************************************************************
+* Copyright 2005 Anglia Design
+* This demo code and associated components are provided as is and has no warranty,
+* implied or otherwise. You are free to use/modify any of the provided
+* code at your own risk in your applications with the expressed limitation
+* of liability (see below)
+*
+* LIMITATION OF LIABILITY: ANGLIA OR ANGLIA DESIGNS SHALL NOT BE LIABLE FOR ANY
+* LOSS OF PROFITS, LOSS OF USE, LOSS OF DATA, INTERRUPTION OF BUSINESS, NOR FOR
+* INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND WHETHER UNDER
+* THIS AGREEMENT OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+*
+* Author : Spencer Oliver
+* Web : www.anglia-designs.com
+*
+***********************************************************************************/
+
+/**** Startup Code (executed after Reset) ****/
+
+/* Frequency values kHz */
+/* set to suit target hardware */
+
+ .equ FOSC, 25000
+
+/* 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 /* available on ARM Arch 4 and later */
+
+ .equ I_Bit, 0x80 /* when I bit is set, IRQ is disabled */
+ .equ F_Bit, 0x40 /* when F bit is set, FIQ is disabled */
+
+ .equ SRAM32, 0x00
+ .equ SRAM64, 0x08
+ .equ SRAM96, 0x10
+
+/* --- System memory locations */
+
+ .equ SCRO_AHB_UMB, 0x5C002034 /* System configuration register 0 (unbuffered) */
+
+ .equ FMI_BASE_UMB, 0x54000000 /* Flash FMI base address (unbuffered) */
+ .equ BBSR_off_addr, 0x00
+ .equ NBBSR_off_addr, 0x04
+ .equ BBADR_off_addr, 0x0C
+ .equ NBBADR_off_addr, 0x10
+ .equ CR_off_addr, 0x18
+
+.ifndef LIBUFF
+ .equ LIBUFF, 0
+.endif
+
+/* Startup Code must be linked first at Address at which it expects to run. */
+
+ .text
+ .arm
+ .section .init, "ax"
+
+ .global _start
+ .global _Main_Crystal
+
+/* After remap this will be our reset handler */
+
+_start:
+ LDR pc, =NextInst
+NextInst:
+
+ NOP /* Wait for OSC stabilization */
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+
+/* Enable buffered mode */
+
+.if LIBUFF
+ MRC p15, 0, r0, c1, c0, 0 /* Read CP15 register 1 into r0 */
+ ORR r0, r0, #0x8 /* Enable Write Buffer on AHB */
+ MCR p15, 0, r0, c1, c0, 0 /* Write CP15 register 1 */
+.endif
+
+/* Remap Flash Bank 0 at address 0x0 and Bank 1 at address 0x80000, */
+/* when the bank 0 is the boot bank, then enable the Bank 1. */
+
+ LDR r0, =FMI_BASE_UMB
+ LDR r1, =0x4 /* configure 512KB Boot bank 0 */
+ STR r1, [r0, #BBSR_off_addr]
+
+ LDR r1, =0x2 /* configure 32KB Non Boot bank 1 */
+ STR r1, [r0, #NBBSR_off_addr]
+
+ LDR r1, =(0x00000000 >> 2) /* Boot Bank Base Address */
+ STR r1, [r0, #BBADR_off_addr]
+
+ LDR r1, =(0x00080000 >> 2) /* Non Boot Bank Base Address */
+ STR r1, [r0, #NBBADR_off_addr]
+
+ LDR r1, =0x18 /* Flash Banks 0 1 enabled */
+ STR r1, [r0, #CR_off_addr]
+
+/* Enable 96K RAM */
+
+ LDR r0, =SCRO_AHB_UMB
+# LDR r1, =0x0196 /* prefetch disabled, default enabled */
+ LDR r1, =0x0187|SRAM96
+ STR r1, [r0]
+
+/* Set bits 17-18 (Instruction/Data TCM order) of the */
+/* Core Configuration Control Register */
+
+ MOV r0, #0x60000
+ MCR p15, 0x1, r0, c15, c1, 0
+
+/* Setup Stack for each mode */
+
+/* Enter Abort Mode and set its Stack Pointer */
+
+ MSR cpsr_c, #Mode_ABT|I_Bit|F_Bit
+ LDR sp, =__stack_abt_end__
+
+/* Enter Undefined Instruction Mode and set its Stack Pointer */
+
+ MSR cpsr_c, #Mode_UND|I_Bit|F_Bit
+ LDR sp, =__stack_und_end__
+
+/* Enter Supervisor Mode and set its Stack Pointer */
+
+ MSR cpsr_c, #Mode_SVC|I_Bit|F_Bit
+ LDR sp, =__stack_svc_end__
+
+/* Enter FIQ Mode and set its Stack Pointer */
+
+ MSR cpsr_c, #Mode_FIQ|I_Bit|F_Bit
+ LDR sp, =__stack_fiq_end__
+
+/* Enter IRQ Mode and set its Stack Pointer */
+
+ MSR cpsr_c, #Mode_IRQ|I_Bit|F_Bit
+ LDR sp, =__stack_irq_end__
+
+/* Enter System/User Mode and set its Stack Pointer */
+
+ MSR cpsr_c, #Mode_SYS
+ LDR sp, =__stack_end__
+
+/* Setup a default Stack Limit (when compiled with "-mapcs-stack-check") */
+
+ LDR sl, =__bss_end__
+
+/* Relocate .data section (Copy from ROM to RAM) */
+
+ LDR r1, =_etext
+ LDR r2, =__data_start
+ LDR r3, =_edata
+LoopRel:
+ CMP r2, r3
+ LDRLO r0, [r1], #4
+ STRLO r0, [r2], #4
+ BLO LoopRel
+
+/* Clear .bss section (Zero init) */
+
+ MOV r0, #0
+ LDR r1, =__bss_start__
+ LDR r2, =__bss_end__
+LoopZI:
+ CMP r1, r2
+ STRLO r0, [r1], #4
+ BLO LoopZI
+
+/* Call C++ constructors */
+
+ LDR r0, =__ctors_start__
+ LDR r1, =__ctors_end__
+ctor_loop:
+ CMP r0, r1
+ BEQ ctor_end
+ LDR r2, [r0], #4
+ STMFD sp!, {r0-r1}
+ BLX r2
+ LDMFD sp!, {r0-r1}
+ B ctor_loop
+ctor_end:
+
+/* Need to set up standard file handles */
+/* Only used under simulator, normally overide syscall.c */
+
+# BL initialise_monitor_handles
+
+/* if we use debug version of str9lib this will call the init function */
+
+ BL libdebug
+libdebug:
+
+/* Enter the C code, use B instruction so as to never return */
+/* use BL main if you want to use c++ destructors below */
+
+ B main
+
+/* Call destructors */
+
+# LDR r0, =__dtors_start__
+# LDR r1, =__dtors_end__
+#dtor_loop:
+# CMP r0, r1
+# BEQ dtor_end
+# LDR r2, [r0], #4
+# STMFD sp!, {r0-r1}
+# BLX r2
+# LDMFD sp!, {r0-r1}
+# B dtor_loop
+#dtor_end:
+
+/* Return from main, loop forever. */
+
+#exit_loop:
+# B exit_loop
+
+/* Fosc values, used by libstr9 */
+
+_Main_Crystal: .long FOSC
+
+ .weak libdebug
+
+ .end
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