| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame^] | 1 | /* Boot entry point for a compressed MN10300 kernel |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | .section .text |
| 12 | |
| 13 | #define DEBUG |
| 14 | |
| 15 | #include <linux/linkage.h> |
| 16 | #include <asm/cpu-regs.h> |
| 17 | |
| 18 | .globl startup_32 |
| 19 | startup_32: |
| 20 | # first save off parameters from bootloader |
| 21 | mov param_save_area,a0 |
| 22 | mov d0,(a0) |
| 23 | mov d1,(4,a0) |
| 24 | mov d2,(8,a0) |
| 25 | |
| 26 | mov sp,a3 |
| 27 | mov decomp_stack+0x2000-4,a0 |
| 28 | mov a0,sp |
| 29 | |
| 30 | # invalidate and enable both of the caches |
| 31 | mov CHCTR,a0 |
| 32 | clr d0 |
| 33 | movhu d0,(a0) # turn off first |
| 34 | mov CHCTR_ICINV|CHCTR_DCINV,d0 |
| 35 | movhu d0,(a0) |
| 36 | setlb |
| 37 | mov (a0),d0 |
| 38 | btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy |
| 39 | lne |
| 40 | mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD,d0 # writethru dcache |
| 41 | movhu d0,(a0) # enable |
| 42 | |
| 43 | # clear the BSS area |
| 44 | mov __bss_start,a0 |
| 45 | mov _end,a1 |
| 46 | clr d0 |
| 47 | bssclear: |
| 48 | cmp a1,a0 |
| 49 | bge bssclear_end |
| 50 | movbu d0,(a0) |
| 51 | inc a0 |
| 52 | bra bssclear |
| 53 | bssclear_end: |
| 54 | |
| 55 | # decompress the kernel |
| 56 | call decompress_kernel[],0 |
| 57 | |
| 58 | # disable caches again |
| 59 | mov CHCTR,a0 |
| 60 | clr d0 |
| 61 | movhu d0,(a0) |
| 62 | setlb |
| 63 | mov (a0),d0 |
| 64 | btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy |
| 65 | lne |
| 66 | |
| 67 | mov param_save_area,a0 |
| 68 | mov (a0),d0 |
| 69 | mov (4,a0),d1 |
| 70 | mov (8,a0),d2 |
| 71 | |
| 72 | mov a3,sp |
| 73 | mov CONFIG_KERNEL_TEXT_ADDRESS,a0 |
| 74 | jmp (a0) |
| 75 | |
| 76 | .data |
| 77 | .align 4 |
| 78 | param_save_area: |
| 79 | .rept 3 |
| 80 | .word 0 |
| 81 | .endr |
| 82 | |
| 83 | .section .bss |
| 84 | .align 4 |
| 85 | decomp_stack: |
| 86 | .space 0x2000 |