forked from Minki/linux
66ab3a74c5
Merge the machine dependent boot directories for v10 and v32. This avoids some code duplication and eases the way for further merging later on. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
146 lines
3.6 KiB
ArmAsm
146 lines
3.6 KiB
ArmAsm
/*
|
|
* Code that sets up the DRAM registers, calls the
|
|
* decompressor to unpack the piggybacked kernel, and jumps.
|
|
*
|
|
* Copyright (C) 1999 - 2006, Axis Communications AB
|
|
*/
|
|
|
|
#define ASSEMBLER_MACROS_ONLY
|
|
#include <hwregs/asm/reg_map_asm.h>
|
|
#include <mach/startup.inc>
|
|
|
|
#define RAM_INIT_MAGIC 0x56902387
|
|
#define COMMAND_LINE_MAGIC 0x87109563
|
|
|
|
;; Exported symbols
|
|
|
|
.globl input_data
|
|
|
|
.text
|
|
start:
|
|
di
|
|
|
|
;; Start clocks for used blocks.
|
|
START_CLOCKS
|
|
|
|
;; Initialize the DRAM registers.
|
|
cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized?
|
|
beq dram_init_finished
|
|
nop
|
|
|
|
#if defined CONFIG_ETRAXFS
|
|
#include "../../arch-v32/mach-fs/dram_init.S"
|
|
#elif defined CONFIG_CRIS_MACH_ARTPEC3
|
|
#include "../../arch-v32/mach-a3/dram_init.S"
|
|
#else
|
|
#error Only ETRAXFS and ARTPEC-3 supported!
|
|
#endif
|
|
|
|
dram_init_finished:
|
|
|
|
GIO_INIT
|
|
;; Setup the stack to a suitably high address.
|
|
;; We assume 8 MB is the minimum DRAM and put
|
|
;; the SP at the top for now.
|
|
|
|
move.d 0x40800000, $sp
|
|
|
|
;; Figure out where the compressed piggyback image is.
|
|
;; It is either in [NOR] flash (we don't want to copy it
|
|
;; to DRAM before unpacking), or copied to DRAM
|
|
;; by the [NAND] flash boot loader.
|
|
;; The piggyback image is at _edata, but relative to where the
|
|
;; image is actually located in memory, not where it is linked
|
|
;; (the decompressor is linked at 0x40700000+ and runs there).
|
|
;; Use (_edata - herami) as offset to the current PC.
|
|
|
|
hereami:
|
|
lapcq ., $r5 ; get PC
|
|
and.d 0x7fffffff, $r5 ; strip any non-cache bit
|
|
move.d $r5, $r0 ; source address of 'herami'
|
|
add.d _edata, $r5
|
|
sub.d hereami, $r5 ; r5 = flash address of '_edata'
|
|
move.d hereami, $r1 ; destination
|
|
|
|
;; Copy text+data to DRAM
|
|
|
|
move.d _edata, $r2 ; end destination
|
|
1: move.w [$r0+], $r3 ; from herami+ source
|
|
move.w $r3, [$r1+] ; to hereami+ destination (linked address)
|
|
cmp.d $r2, $r1 ; finish when destination == _edata
|
|
bcs 1b
|
|
nop
|
|
move.d input_data, $r0 ; for the decompressor
|
|
move.d $r5, [$r0] ; for the decompressor
|
|
|
|
;; Clear the decompressors BSS (between _edata and _end)
|
|
|
|
moveq 0, $r0
|
|
move.d _edata, $r1
|
|
move.d _end, $r2
|
|
1: move.w $r0, [$r1+]
|
|
cmp.d $r2, $r1
|
|
bcs 1b
|
|
nop
|
|
|
|
;; Save command line magic and address.
|
|
move.d _cmd_line_magic, $r0
|
|
move.d $r10, [$r0]
|
|
move.d _cmd_line_addr, $r0
|
|
move.d $r11, [$r0]
|
|
|
|
;; Save boot source indicator
|
|
move.d _boot_source, $r0
|
|
move.d $r12, [$r0]
|
|
|
|
;; Do the decompression and save compressed size in _inptr
|
|
|
|
jsr decompress_kernel
|
|
nop
|
|
|
|
;; Restore boot source indicator
|
|
move.d _boot_source, $r12
|
|
move.d [$r12], $r12
|
|
|
|
;; Restore command line magic and address.
|
|
move.d _cmd_line_magic, $r10
|
|
move.d [$r10], $r10
|
|
move.d _cmd_line_addr, $r11
|
|
move.d [$r11], $r11
|
|
|
|
;; Put start address of root partition in r9 so the kernel can use it
|
|
;; when mounting from flash
|
|
move.d input_data, $r0
|
|
move.d [$r0], $r9 ; flash address of compressed kernel
|
|
move.d inptr, $r0
|
|
add.d [$r0], $r9 ; size of compressed kernel
|
|
cmp.d 0x40000000, $r9 ; image in DRAM ?
|
|
blo enter_kernel ; no, must be [NOR] flash, jump
|
|
nop ; delay slot
|
|
and.d 0x001fffff, $r9 ; assume compressed kernel was < 2M
|
|
|
|
enter_kernel:
|
|
;; Enter the decompressed kernel
|
|
move.d RAM_INIT_MAGIC, $r8 ; Tell kernel that DRAM is initialized
|
|
jump 0x40004000 ; kernel is linked to this address
|
|
nop
|
|
|
|
.data
|
|
|
|
input_data:
|
|
.dword 0 ; used by the decompressor
|
|
_cmd_line_magic:
|
|
.dword 0
|
|
_cmd_line_addr:
|
|
.dword 0
|
|
_boot_source:
|
|
.dword 0
|
|
|
|
#if defined CONFIG_ETRAXFS
|
|
#include "../../arch-v32/mach-fs/hw_settings.S"
|
|
#elif defined CONFIG_CRIS_MACH_ARTPEC3
|
|
#include "../../arch-v32/mach-a3/hw_settings.S"
|
|
#else
|
|
#error Only ETRAXFS and ARTPEC-3 supported!
|
|
#endif
|