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Annotation of funnyos/arch/testarm/boot/loader.S, Revision 1.3

1.1       init        1: /*
1.3     ! init        2:  * $Id: loader.S,v 1.2 2007/10/29 20:34:23 init Exp $
1.1       init        3:  */
                      4: /*
                      5:  *     FunnyOS loader
                      6:  *     for gxemul test arm machines.
                      7:  */
                      8: .text
                      9: .global _start
                     10: .global main
                     11:
                     12: _start:
1.3     ! init       13: b      _vector_reset           /* reset */
1.1       init       14: bl     _vector_undef           /* undefined insn */
                     15: bl     _vector_swi                     /* software intr handler */
                     16: bl     _vector_dataabrt        /* data abort */
                     17: bl     _vector_prefabrt        /* prefetch abort */
                     18: .word 0x00000000               /* [reserved] */
1.3     ! init       19: b      _vector_irq                     /* IRQ */
1.1       init       20: bl     _vector_fiq                     /* Fast Interrupt Request */
                     21:
                     22: _vector_reset:
                     23:        /*
1.3     ! init       24:         *      Will enter here just right after RESET.
        !            25:         *      Set up stack and call main.
        !            26:         */
1.1       init       27:
1.3     ! init       28:        /*
        !            29:         * Setup an IRQ stack
        !            30:         */
        !            31:        /* switch into irq mode with interrupts disabled */
        !            32:        msr cpsr_c, #(0x12 | 0x80)
        !            33:
        !            34:        /* set sp (sp is banked) */
        !            35:        ldr sp, Airqstack
        !            36:
        !            37:        /*
        !            38:         * Setup system stack
        !            39:         */
        !            40:        /* switch into system mode (interrupts turned off) */
        !            41:        msr cpsr_c, #(0x1f | 0x80)
        !            42:
        !            43:        /* set system stack pointer */
        !            44:        ldr sp, Asysstack
1.1       init       45:
                     46:        b main
                     47:        /* NOTREACHED */
                     48:
                     49: _vector_undef:
                     50:        /* Undefined insn handler */
                     51:        mov pc, r14
                     52:
                     53: _vector_swi:
                     54:        mov pc, r14
                     55:
                     56: _vector_dataabrt:
                     57:        /* XXX fatal */
                     58:        nop
                     59:
                     60: _vector_prefabrt:
                     61:        nop
                     62:
                     63: _vector_irq:
1.3     ! init       64:
1.2       init       65:        bl irq_trampoline
1.1       init       66:
1.3     ! init       67:        mrs r0, spsr
        !            68:        msr cpsr, r0
        !            69:
        !            70:        subs pc, r14, #4
        !            71:
1.1       init       72: _vector_fiq:
                     73:        nop
                     74:
                     75: /* last word of the physical memory */
1.3     ! init       76: Asysstack:
1.1       init       77: .word  0x01fffffc
1.3     ! init       78: Airqstack:
        !            79: .word  0x01fff000
1.1       init       80: