/* $NetBSD: smdk2800_start.S,v 1.8 2011/01/31 06:28:05 matt Exp $ */
/*
* Copyright (c) 2002, 2005 Fujitsu Component Limited
* Copyright (c) 2002, 2005 Genetec Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Fujitsu Component Limited nor the name of
* Genetec corporation may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
* CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC
* CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <machine/asm.h>
#include <arm/armreg.h>
#include "assym.h"
#include <arm/s3c2xx0/s3c2800reg.h> /* for S3C2800_DBANK0_START */
#include <evbarm/smdk2xx0/smdk2800var.h>
RCSID("$NetBSD: smdk2800_start.S,v 1.8 2011/01/31 06:28:05 matt Exp $")
/*
* Kernel start routine for Samsung SMDK2800.
* This code is excuted at the very first after the kernel is loaded
* by boot program on ROM or gzboot.
*/
.text
#define KERNEL_TEXT_ADDR (SDRAM_START+0x00200000)
.global _C_LABEL(smdk2800_start)
_C_LABEL(smdk2800_start):
/* Are we running on right place ? */
adr r0, _C_LABEL(smdk2800_start)
cmp r0, #KERNEL_TEXT_ADDR
beq smdk2800_start_ram
/* move me to RAM
* XXX: we can use memcpy if it is PIC
*/
ldr r1, Lcopy_size
adr r0, _C_LABEL(smdk2800_start)
add r1, r1, #3
mov r1, r1, LSR #2
mov r2, #KERNEL_TEXT_ADDR
mov r4, r2
cmp r0, r2
bhs 5f
/* src < dest. copy from top */
add r0,r0,r1,LSL #2
add r2,r2,r1,LSL #2
3: ldr r3,[r0,#-4]!
str r3,[r2,#-4]!
subs r1,r1,#1
bhi 3b
b 7f
/* src >= dest. copy from bottom */
5: ldr r3,[r0],#4
str r3,[r2],#4
subs r1,r1,#1
bhi 5b
7:
/* Jump to RAM */
ldr r0, Lstart_off
add pc, r4, r0
Lcopy_size: .word _edata-_C_LABEL(smdk2800_start)
Lstart_off: .word smdk2800_start_ram-_C_LABEL(smdk2800_start)
smdk2800_start_ram:
/*
* Kernel is loaded in SDRAM (0x08200000..), and is expected to run
* in VA 0xc0200000..
*/
/* Disable MMU for a while */
mrc p15, 0, r2, c1, c0, 0
bic r2, r2, #CPU_CONTROL_MMU_ENABLE
mcr p15, 0, r2, c1, c0, 0
nop
nop
nop
mov r0,#SDRAM_START /* pagetable */
adr r4, mmu_init_table
b 2f
1:
str r3, [r0, r2]
add r2, r2, #4
add r3, r3, #(L1_S_SIZE)
adds r1, r1, #-1
bhi 1b
2:
ldmia r4!, {r1,r2,r3} /* # of sections, PA|attr, VA */
cmp r1, #0
bne 1b
mcr p15, 0, r0, c2, c0, 0 /* Set TTB */
mcr p15, 0, r0, c8, c7, 0 /* Flush TLB */
/* Set the Domain Access register. Very important! */
mov r0, #((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT)
mcr p15, 0, r0, c3, c0, 0
/* Enable MMU */
mrc p15, 0, r0, c1, c0, 0
orr r0, r0, #CPU_CONTROL_MMU_ENABLE
mcr p15, 0, r0, c1, c0, 0
nop
nop
nop
/* Jump to kernel code in TRUE VA */
adr r0, Lstart
ldr pc, [r0]
Lstart:
.word start
#define MMU_INIT(va,pa,n_sec,attr) \
.word n_sec ; \
.word 4*((va)>>L1_S_SHIFT) ; \
.word (pa)|(attr) ;
mmu_init_table:
/* fill all table VA==PA */
MMU_INIT(0x00000000, 0x00000000, 1<<(32-L1_S_SHIFT), L1_TYPE_S|L1_S_AP_KRW)
/* map SDRAM VA==PA, WT cacheable */
MMU_INIT(SDRAM_START, SDRAM_START, 64, L1_TYPE_S|L1_S_C|L1_S_AP_KRW)
/* map VA 0xc0000000..0xc3ffffff to PA 0x08000000..0x0bffffff */
MMU_INIT(0xc0000000, SDRAM_START, 64, L1_TYPE_S|L1_S_C|L1_S_AP_KRW)
/* Map all built-in peripheral registers at 0xfd000000 */
MMU_INIT(SMDK2800_IO_AREA_VBASE, S3C2800_PERIPHERALS, 2, L1_TYPE_S|L1_S_AP_KRW)
.word 0 /* end of table */
