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Annotation of funnyos/arch/sam7s64/boot/loader.S, Revision 1.2

1.1       init        1: /*
1.2     ! init        2:  * $Id: loader.S,v 1.1 2007/11/08 22:07:04 init Exp $
1.1       init        3:  */
                      4: /*
                      5:  *     FunnyOS loader
                      6:  *     for Atmel SAM7S64 SoC.
                      7:  */
                      8: .text
                      9: .global _start
                     10: .global main
                     11:
                     12: _start:
                     13: b      _vector_reset           /* reset */
                     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] */
                     19: b      _vector_irq                     /* IRQ */
                     20: bl     _vector_fiq                     /* Fast Interrupt Request */
                     21:
                     22: _vector_reset:
                     23:        /*
                     24:         *      Will enter here just right after RESET.
                     25:         *      Set up stack and call main.
                     26:         */
                     27:
                     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
                     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:
                     64:        /* decrement pc by one insn */
                     65:        sub lr, lr, #4
                     66:
                     67:        /* store all system mode registers */
                     68:        stmdb sp!, {r0-r12, lr}
                     69:
                     70:        bl irq_trampoline
                     71:
                     72:        /* load r0-r12 and pc from the stack */
                     73:        /* note ^ that copies SPSR into CPSR */
                     74:        ldmia sp!, {r0-r12, pc}^
                     75:
                     76: _vector_fiq:
                     77:        nop
                     78:
                     79: /* last word of the physical memory */
                     80: Asysstack:
1.2     ! init       81: .word  0x00203fff
1.1       init       82: Airqstack:
1.2     ! init       83: .word  0x00201000
1.1       init       84: