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MIPS: factor out code for initial stack and global data 

Move the code for setting up the initial stack and global data
to a macro to be able to use it more than once.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Daniel Schwierzeck 2016-09-25 18:36:38 +02:00
parent 65d297af7c
commit c3e72ab801
1 changed files with 30 additions and 26 deletions
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56
arch/mips/cpu/start.S
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@ -52,6 +52,34 @@
sdbbp 1 # Invoke UHI operation
.endm
.macro setup_stack_gd
li t0, -16
PTR_LI t1, CONFIG_SYS_INIT_SP_ADDR
and sp, t1, t0 # force 16 byte alignment
PTR_SUBU \
sp, sp, GD_SIZE # reserve space for gd
and sp, sp, t0 # force 16 byte alignment
move k0, sp # save gd pointer
#ifdef CONFIG_SYS_MALLOC_F_LEN
li t2, CONFIG_SYS_MALLOC_F_LEN
PTR_SUBU \
sp, sp, t2 # reserve space for early malloc
and sp, sp, t0 # force 16 byte alignment
#endif
move fp, sp
/* Clear gd */
move t0, k0
1:
PTR_S zero, 0(t0)
blt t0, t1, 1b
PTR_ADDIU t0, PTRSIZE
#ifdef CONFIG_SYS_MALLOC_F_LEN
PTR_S sp, GD_MALLOC_BASE(k0) # gd->malloc_base offset
#endif
.endm
ENTRY(_start)
/* U-Boot entry point */
b reset
@ -227,32 +255,8 @@ wr_done:
# endif
#endif
/* Set up temporary stack */
li t0, -16
PTR_LI t1, CONFIG_SYS_INIT_SP_ADDR
and sp, t1, t0 # force 16 byte alignment
PTR_SUBU \
sp, sp, GD_SIZE # reserve space for gd
and sp, sp, t0 # force 16 byte alignment
move k0, sp # save gd pointer
#ifdef CONFIG_SYS_MALLOC_F_LEN
li t2, CONFIG_SYS_MALLOC_F_LEN
PTR_SUBU \
sp, sp, t2 # reserve space for early malloc
and sp, sp, t0 # force 16 byte alignment
#endif
move fp, sp
/* Clear gd */
move t0, k0
1:
PTR_S zero, 0(t0)
blt t0, t1, 1b
PTR_ADDIU t0, PTRSIZE
#ifdef CONFIG_SYS_MALLOC_F_LEN
PTR_S sp, GD_MALLOC_BASE(k0) # gd->malloc_base offset
#endif
/* Set up initial stack and global data */
setup_stack_gd
move a0, zero # a0 <-- boot_flags = 0
PTR_LA t9, board_init_f