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mips: add a option to support not reserving malloc space on initial stack

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The initial stack on some platforms is too small to hold a large malloc
space. This patch adds a option to allow these platforms not reserving the
malloc space on initial stack. These platforms should set the malloc base
after DRAM is usable.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
This commit is contained in:
Weijie Gao 2020-04-21 09:28:33 +02:00 committed by Daniel Schwierzeck
parent 2434f58c78
commit c95c3ec025
2 changed files with 22 additions and 2 deletions
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18
arch/mips/Kconfig
View file

@ -317,6 +317,24 @@ config NEW_EXCEPTION_VECTOR_BASE
help
The exception vector base to be restored before booting linux kernel
config INIT_STACK_WITHOUT_MALLOC_F
bool "Do not reserve malloc space on initial stack"
default n
help
Enable this option if you don't want to reserve malloc space on
initial stack. This is useful if the initial stack can't hold large
malloc space. Platform should set the malloc_base later when DRAM is
ready to use.
config SPL_INIT_STACK_WITHOUT_MALLOC_F
bool "Do not reserve malloc space on initial stack in SPL"
default n
help
Enable this option if you don't want to reserve malloc space on
initial stack. This is useful if the initial stack can't hold large
malloc space. Platform should set the malloc_base later when DRAM is
ready to use.
config SPL_LOADER_SUPPORT
bool
default n

6
arch/mips/cpu/start.S
View file

@ -59,7 +59,8 @@
sp, sp, GD_SIZE # reserve space for gd
and sp, sp, t0 # force 16 byte alignment
move k0, sp # save gd pointer
#if CONFIG_VAL(SYS_MALLOC_F_LEN)
#if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
!CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
li t2, CONFIG_VAL(SYS_MALLOC_F_LEN)
PTR_SUBU \
sp, sp, t2 # reserve space for early malloc
@ -75,7 +76,8 @@
blt t0, t1, 1b
nop
#if CONFIG_VAL(SYS_MALLOC_F_LEN)
#if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
!CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
PTR_S sp, GD_MALLOC_BASE(k0) # gd->malloc_base offset
#endif
.endm