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Annotation of prex-old/boot/arm/cats/head.S, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 2005, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * head.S - low level platform support
        !            32:  *
        !            33:  * This file contains the code from crt0.S which is released under
        !            34:  * public domain by Jeff Frohwein.
        !            35:  */
        !            36:
        !            37: /*
        !            38:  * I know that I'm a bit slacky, but this is the memory map for cats.
        !            39:  * GXemul> device list
        !            40:  * 0:                       ram @ 0x00041000000, len = 0x40000 (DYNTRANS R+W)
        !            41:  * 1:                footbridge @ 0x00042000000, len = 0x400
        !            42:  * 2:                       ram @ 0x00050000000, len = 0x10000 (DYNTRANS R+W)
        !            43:  * 3:            footbridge_isa @ 0x00079000000, len = 0x8
        !            44:  * 4:            footbridge_pci @ 0x0007b000000, len = 0x1000000
        !            45:  * 5:                      8259 @ 0x0007c000020, len = 0x2
        !            46:  * 6:                      8253 @ 0x0007c000040, len = 0x4
        !            47:  * 7:                     pckbc @ 0x0007c000060, len = 0x10
        !            48:  * 8:                    pccmos @ 0x0007c000070, len = 0x4
        !            49:  * 9:          8259 [secondary] @ 0x0007c0000a0, len = 0x2
        !            50:  * 10:            ns16550 [tty1] @ 0x0007c0002f8, len = 0x8
        !            51:  * 11:                 lpt [lpt] @ 0x0007c000378, len = 0x3
        !            52:  * 12:                  vga_ctrl @ 0x0007c0003c0, len = 0x20
        !            53:  * 13:            ns16550 [tty0] @ 0x0007c0003f8, len = 0x8
        !            54:  * 14: dec21143 [10:20:30:00:00:10] @ 0x0007c010000, len = 0x100
        !            55:  * 15:                       ram @ 0x00080000000, len = 0x1000 (DYNTRANS R+W)
        !            56:  * 16:              ram [mirror] @ 0x00080010000, len = 0x100 ()
        !            57:  * 17:                   vga_gfx @ 0x000800a0000, len = 0x18000 ()
        !            58:  * 18:             vga_charcells @ 0x000800b8000, len = 0x8000 (DYNTRANS R+W)
        !            59:  * 19:              ram [mirror] @ 0x000c0000000, len = 0x20000000 (DYNTRANS R+W)
        !            60:  * 20:              ram [mirror] @ 0x000f0000000, len = 0x1000000 (DYNTRANS R+W)
        !            61:  * 21:                  fb [VGA] @ 0x01c00000000, len = 0xbb800 (DYNTRANS R+W)
        !            62:  * 22:                  mc146818 @ 0x01d00000000, len = 0x2
        !            63:  *
        !            64:  * Firmware loads us at 0xf0000000 with MMU on and TTB @0x006f8000.
        !            65:  */
        !            66:
        !            67: #include <conf/config.h>
        !            68: #include <platform.h>
        !            69:
        !            70: #define ENTRY(x) .global x; .align; x##:
        !            71:
        !            72:        .section ".text","ax"
        !            73:        .code 32
        !            74: /*
        !            75:  * Kernel start point
        !            76:  */
        !            77: ENTRY(boot_entry)
        !            78:        b       start_vector
        !            79:
        !            80: stack_end:     .word   BOOT_STACK+0xf00
        !            81:
        !            82: start_vector:
        !            83:        mov     r0, #0xd3               /* Enter SVC mode, Disable IRQ,FIQ */
        !            84:        msr     cpsr_c, r0
        !            85:
        !            86:        mrc p15, 0, r0, c1, c0
        !            87:        bic r0, r0, #1  /* disable MMU */
        !            88:        mcr p15, 0, r0, c1, c0
        !            89:
        !            90:        ldr     sp, stack_end
        !            91:
        !            92:        /* initialize boot console */
        !            93:        bl      bootcons_init
        !            94:
        !            95:        ldr     r0, =loader_main
        !            96:        bx      r0              /* Change to ARM mode */
        !            97:
        !            98: /*
        !            99:  * Start kernel
        !           100:  */
        !           101: ENTRY(start_kernel)
        !           102:        bx      r0
        !           103:
        !           104:                .section .tail,"ax"
        !           105: dummy:
        !           106:        .byte   0xff
        !           107:
        !           108: .end