| /* Boot entry point for a compressed MN10300 kernel |
| * |
| * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public Licence |
| * as published by the Free Software Foundation; either version |
| * 2 of the Licence, or (at your option) any later version. |
| */ |
| .section .text |
| |
| #define DEBUG |
| |
| #include <linux/linkage.h> |
| #include <asm/cpu-regs.h> |
| |
| .globl startup_32 |
| startup_32: |
| # first save off parameters from bootloader |
| mov param_save_area,a0 |
| mov d0,(a0) |
| mov d1,(4,a0) |
| mov d2,(8,a0) |
| |
| mov sp,a3 |
| mov decomp_stack+0x2000-4,a0 |
| mov a0,sp |
| |
| # invalidate and enable both of the caches |
| mov CHCTR,a0 |
| clr d0 |
| movhu d0,(a0) # turn off first |
| mov CHCTR_ICINV|CHCTR_DCINV,d0 |
| movhu d0,(a0) |
| setlb |
| mov (a0),d0 |
| btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy |
| lne |
| mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD,d0 # writethru dcache |
| movhu d0,(a0) # enable |
| |
| # clear the BSS area |
| mov __bss_start,a0 |
| mov _end,a1 |
| clr d0 |
| bssclear: |
| cmp a1,a0 |
| bge bssclear_end |
| movbu d0,(a0) |
| inc a0 |
| bra bssclear |
| bssclear_end: |
| |
| # decompress the kernel |
| call decompress_kernel[],0 |
| |
| # disable caches again |
| mov CHCTR,a0 |
| clr d0 |
| movhu d0,(a0) |
| setlb |
| mov (a0),d0 |
| btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy |
| lne |
| |
| mov param_save_area,a0 |
| mov (a0),d0 |
| mov (4,a0),d1 |
| mov (8,a0),d2 |
| |
| mov a3,sp |
| mov CONFIG_KERNEL_TEXT_ADDRESS,a0 |
| jmp (a0) |
| |
| .data |
| .align 4 |
| param_save_area: |
| .rept 3 |
| .word 0 |
| .endr |
| |
| .section .bss |
| .align 4 |
| decomp_stack: |
| .space 0x2000 |