mirror of https://gitee.com/openkylin/linux.git
250 lines
4.5 KiB
ArmAsm
250 lines
4.5 KiB
ArmAsm
#include <variant/core.h>
|
|
#include <asm/regs.h>
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/cacheasm.h>
|
|
/*
|
|
* RB-Data: RedBoot data/bss
|
|
* P: Boot-Parameters
|
|
* L: Kernel-Loader
|
|
*
|
|
* The Linux-Kernel image including the loader must be loaded
|
|
* to a position so that the kernel and the boot parameters
|
|
* can fit in the space before the load address.
|
|
* ______________________________________________________
|
|
* |_RB-Data_|_P_|__________|_L_|___Linux-Kernel___|______|
|
|
* ^
|
|
* ^ Load address
|
|
* ______________________________________________________
|
|
* |___Linux-Kernel___|_P_|_L_|___________________________|
|
|
*
|
|
* The loader copies the parameter to the position that will
|
|
* be the end of the kernel and itself to the end of the
|
|
* parameter list.
|
|
*/
|
|
|
|
/* Make sure we have enough space for the 'uncompressor' */
|
|
|
|
#define STACK_SIZE 32768
|
|
#define HEAP_SIZE (131072*4)
|
|
|
|
# a2: Parameter list
|
|
# a3: Size of parameter list
|
|
|
|
.section .start, "ax"
|
|
|
|
.globl __start
|
|
/* this must be the first byte of the loader! */
|
|
__start:
|
|
entry sp, 32 # we do not intend to return
|
|
_call0 _start
|
|
__start_a0:
|
|
.align 4
|
|
|
|
.section .text, "ax"
|
|
.begin literal_prefix .text
|
|
|
|
/* put literals in here! */
|
|
|
|
.globl _start
|
|
_start:
|
|
|
|
/* 'reset' window registers */
|
|
|
|
movi a4, 1
|
|
wsr a4, ps
|
|
rsync
|
|
|
|
rsr a5, windowbase
|
|
ssl a5
|
|
sll a4, a4
|
|
wsr a4, windowstart
|
|
rsync
|
|
|
|
movi a4, 0x00040000
|
|
wsr a4, ps
|
|
rsync
|
|
|
|
/* copy the loader to its address
|
|
* Note: The loader itself is a very small piece, so we assume we
|
|
* don't partially overlap. We also assume (even more important)
|
|
* that the kernel image is out of the way. Usually, when the
|
|
* load address of this image is not at an arbitrary address,
|
|
* but aligned to some 10K's we shouldn't overlap.
|
|
*/
|
|
|
|
/* Note: The assembler cannot relax "addi a0, a0, ..." to an
|
|
l32r, so we load to a4 first. */
|
|
|
|
# addi a4, a0, __start - __start_a0
|
|
# mov a0, a4
|
|
|
|
movi a4, __start
|
|
movi a5, __start_a0
|
|
add a4, a0, a4
|
|
sub a0, a4, a5
|
|
|
|
movi a4, __start
|
|
movi a5, __reloc_end
|
|
|
|
# a0: address where this code has been loaded
|
|
# a4: compiled address of __start
|
|
# a5: compiled end address
|
|
|
|
mov.n a7, a0
|
|
mov.n a8, a4
|
|
|
|
1:
|
|
l32i a10, a7, 0
|
|
l32i a11, a7, 4
|
|
s32i a10, a8, 0
|
|
s32i a11, a8, 4
|
|
l32i a10, a7, 8
|
|
l32i a11, a7, 12
|
|
s32i a10, a8, 8
|
|
s32i a11, a8, 12
|
|
addi a8, a8, 16
|
|
addi a7, a7, 16
|
|
blt a8, a5, 1b
|
|
|
|
|
|
/* We have to flush and invalidate the caches here before we jump. */
|
|
|
|
#if XCHAL_DCACHE_IS_WRITEBACK
|
|
|
|
___flush_dcache_all a5 a6
|
|
|
|
#endif
|
|
|
|
___invalidate_icache_all a5 a6
|
|
isync
|
|
|
|
movi a11, _reloc
|
|
jx a11
|
|
|
|
.globl _reloc
|
|
_reloc:
|
|
|
|
/* RedBoot is now at the end of the memory, so we don't have
|
|
* to copy the parameter list. Keep the code around; in case
|
|
* we need it again. */
|
|
#if 0
|
|
# a0: load address
|
|
# a2: start address of parameter list
|
|
# a3: length of parameter list
|
|
# a4: __start
|
|
|
|
/* copy the parameter list out of the way */
|
|
|
|
movi a6, _param_start
|
|
add a3, a2, a3
|
|
2:
|
|
l32i a8, a2, 0
|
|
s32i a8, a6, 0
|
|
addi a2, a2, 4
|
|
addi a6, a6, 4
|
|
blt a2, a3, 2b
|
|
#endif
|
|
|
|
/* clear BSS section */
|
|
movi a6, __bss_start
|
|
movi a7, __bss_end
|
|
movi.n a5, 0
|
|
3:
|
|
s32i a5, a6, 0
|
|
addi a6, a6, 4
|
|
blt a6, a7, 3b
|
|
|
|
movi a5, -16
|
|
movi a1, _stack + STACK_SIZE
|
|
and a1, a1, a5
|
|
|
|
/* Uncompress the kernel */
|
|
|
|
# a0: load address
|
|
# a2: boot parameter
|
|
# a4: __start
|
|
|
|
movi a3, __image_load
|
|
sub a4, a3, a4
|
|
add a8, a0, a4
|
|
|
|
# a1 Stack
|
|
# a8(a4) Load address of the image
|
|
|
|
movi a6, _image_start
|
|
movi a10, _image_end
|
|
movi a7, 0x1000000
|
|
sub a11, a10, a6
|
|
movi a9, complen
|
|
s32i a11, a9, 0
|
|
|
|
movi a0, 0
|
|
|
|
# a6 destination
|
|
# a7 maximum size of destination
|
|
# a8 source
|
|
# a9 ptr to length
|
|
|
|
.extern gunzip
|
|
movi a4, gunzip
|
|
beqz a4, 1f
|
|
|
|
callx4 a4
|
|
|
|
j 2f
|
|
|
|
|
|
# a6 destination start
|
|
# a7 maximum size of destination
|
|
# a8 source start
|
|
# a9 ptr to length
|
|
# a10 destination end
|
|
|
|
1:
|
|
l32i a9, a8, 0
|
|
l32i a11, a8, 4
|
|
s32i a9, a6, 0
|
|
s32i a11, a6, 4
|
|
l32i a9, a8, 8
|
|
l32i a11, a8, 12
|
|
s32i a9, a6, 8
|
|
s32i a11, a6, 12
|
|
addi a6, a6, 16
|
|
addi a8, a8, 16
|
|
blt a6, a10, 1b
|
|
|
|
|
|
/* jump to the kernel */
|
|
2:
|
|
#if XCHAL_DCACHE_IS_WRITEBACK
|
|
|
|
___flush_dcache_all a5 a6
|
|
|
|
#endif
|
|
|
|
___invalidate_icache_all a5 a6
|
|
|
|
isync
|
|
|
|
# a2 Boot parameter list
|
|
|
|
movi a0, _image_start
|
|
jx a0
|
|
|
|
.align 16
|
|
.data
|
|
.globl avail_ram
|
|
avail_ram:
|
|
.long _heap
|
|
.globl end_avail
|
|
end_avail:
|
|
.long _heap + HEAP_SIZE
|
|
|
|
.comm _stack, STACK_SIZE
|
|
.comm _heap, HEAP_SIZE
|
|
|
|
.globl end_avail
|
|
.comm complen, 4
|
|
|
|
.end literal_prefix
|