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better start file

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removed unnecessary line from tmr-int test
This commit is contained in:
Mariano Alvira 2010-03-02 16:26:42 -05:00
parent 9b05f05503
commit a00b9f7bd0
2 changed files with 82 additions and 53 deletions
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121
src/start.S
View file

@ -4,9 +4,6 @@
* Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
* Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
*
* Modified for the mc13224v
* Copyright (c) 2009 Mariano Alvira <mar@devl.org>
*
* See file CREDITS for list of people who contributed to this
* project.
*
@ -26,10 +23,11 @@
* MA 02111-1307 USA
*/
/* Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs */
.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 IRQ_DISABLE, 0x80 /* when I bit is set, IRQ is disabled */
.equ FIQ_DISABLE, 0x40 /* when F bit is set, FIQ is disabled */
.equ USR_MODE, 0x10
.equ FIQ_MODE, 0x11
@ -39,12 +37,13 @@
.equ UND_MODE, 0x1B
.equ SYS_MODE, 0x1F
.equ usr_stack_size, 256*4
.equ irq_stack_size, 128*4
.equ fiq_stack_size, 128*4
.equ und_stack_size, 32*4
.equ abt_stack_size, 32*4
.equ sup_stack_size, 32*4
.equ usr_stack_size, 1024
.equ irq_stack_size, 256
.equ fiq_stack_size, 256
.equ und_stack_size, 256
.equ abt_stack_size, 16
.equ sup_stack_size, 16
/*
*************************************************************************
@ -54,9 +53,11 @@
*************************************************************************
*/
.set base, .
.set _rom_data_init, 0x108d0
.globl _start
_start: b _begin
ldr pc, _undefined_instruction
@ -86,7 +87,6 @@ _RPTV_2_START:
_RPTV_3_START:
bx lr /* do nothing */
.org 0x120
ROM_var_start: .word 0
.org 0x7ff
@ -96,40 +96,65 @@ ROM_var_end: .word 0
.code 32
.align
_begin:
/* FIQ mode stack */
msr CPSR_c, #(FIQ_MODE | IRQ_DISABLE | FIQ_DISABLE)
ldr sp, =__fiq_stack_top__ /* set the FIQ stack pointer */
ldr r1,=_system_stack
msr cpsr_c,#(SVC_MODE | I_BIT | F_BIT)
add r1,r1,#sup_stack_size
mov sp,r1
/* IRQ mode stack */
msr CPSR_c, #(IRQ_MODE | IRQ_DISABLE | FIQ_DISABLE)
ldr sp, =__irq_stack_top__ /* set the IRQ stack pointer */
msr cpsr_c,#(IRQ_MODE | I_BIT | F_BIT)
add r1,r1,#irq_stack_size
mov sp,r1
/* Supervisor mode stack */
msr CPSR_c, #(SVC_MODE | IRQ_DISABLE | FIQ_DISABLE)
ldr sp, =__svc_stack_top__ /* set the SVC stack pointer */
msr cpsr_c,#(FIQ_MODE | I_BIT | F_BIT)
add r1,r1,#fiq_stack_size
mov sp,r1
/* Undefined mode stack */
msr CPSR_c, #(UND_MODE | IRQ_DISABLE | FIQ_DISABLE)
ldr sp, =__und_stack_top__ /* set the UND stack pointer */
msr cpsr_c,#(ABT_MODE | I_BIT | F_BIT)
add r1,r1,#abt_stack_size
mov sp,r1
/* Abort mode stack */
msr CPSR_c, #(ABT_MODE | IRQ_DISABLE | FIQ_DISABLE)
ldr sp, =__abt_stack_top__ /* set the ABT stack pointer */
msr cpsr_c,#(UND_MODE | I_BIT | F_BIT)
add r1,r1,#und_stack_size
mov sp,r1
// msr cpsr_c,#(USR_MODE | I_BIT | F_BIT)
/* System mode stack */
msr CPSR_c, #(SYS_MODE | IRQ_DISABLE | FIQ_DISABLE)
ldr sp, =__sys_stack_top__ /* set the SYS stack pointer */
#ifdef USE_ROM_VARS
bl _rom_data_init+.-base
#endif
msr cpsr_c,#(SVC_MODE) // turn on interrupts --- for debug only
// msr cpsr_c,#(USR_MODE) // turn on interrupts --- for debug only
// add r1,r1,#usr_stack_size
// mov sp,r1
msr CPSR_c, #(SYS_MODE)
b main
// ldr r1,=_system_stack
// msr cpsr_c,#(SVC_MODE | I_BIT | F_BIT)
// add r1,r1,#sup_stack_size
// mov sp,r1
// msr cpsr_c,#(IRQ_MODE | I_BIT | F_BIT)
// add r1,r1,#irq_stack_size
// mov sp,r1
// msr cpsr_c,#(FIQ_MODE | I_BIT | F_BIT)
// add r1,r1,#fiq_stack_size
// mov sp,r1
// msr cpsr_c,#(ABT_MODE | I_BIT | F_BIT)
// add r1,r1,#abt_stack_size
// mov sp,r1
// msr cpsr_c,#(UND_MODE | I_BIT | F_BIT)
// add r1,r1,#und_stack_size
// mov sp,r1
// msr cpsr_c,#(USR_MODE | I_BIT | F_BIT)
// bl _rom_data_init+.-base
// msr cpsr_c,#(SVC_MODE) // turn on interrupts --- for debug only
// msr cpsr_c,#(USR_MODE) // turn on interrupts --- for debug only
// add r1,r1,#usr_stack_size
// mov sp,r1
_undefined_instruction: .word undefined_instruction
_software_interrupt: .word software_interrupt
@ -140,6 +165,7 @@ _irq: .word irq
_fiq: .word fiq
.balignl 16,0xdeadbeef
/*
*************************************************************************
*
@ -160,10 +186,6 @@ _TEXT_BASE:
_armboot_start:
.word _start
_system_stack:
. = . + usr_stack_size + irq_stack_size + fiq_stack_size + und_stack_size + abt_stack_size + sup_stack_size
/*
* These are defined in the board-specific linker script.
*/
@ -177,6 +199,22 @@ _bss_end:
_start_armboot: .word main
_system_stack:
. = . + usr_stack_size + irq_stack_size + fiq_stack_size + und_stack_size + abt_stack_size + sup_stack_size
/*
*************************************************************************
*
* CPU_init_critical registers
*
*************************************************************************
*/
cpu_init_crit:
# actually do nothing for now!
mov pc, lr
/*
* exception handlers
@ -199,11 +237,8 @@ not_used:
.align 5
//irq:
// push {lr}
// movs lr,pc
// b isr
// pop {lr}
// subs pc,r14,#4 // suggested irq return cmd
//
// .align 5
fiq:
.align 5

6
tests/tmr-ints.c
View file

@ -60,12 +60,6 @@ void main(void) {
enable_tmr_irq();
/* go into user mode to handle IRQs */
/* disabling interrupts is now difficult */
asm(".code 32;"
"msr cpsr_c,#(0x10);"
".code 16; ");
while(1) {
/* sit here and let the interrupts do the work */
};