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board: ns3: add api to save boot parameters passed from BL31

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Add API to save boot parameters passed from BL31

Use assembly implementation of save_boot_params instead of c function.
Because generally ATF does not set up SP_EL2 on exiting.
Thus, usage of a C function immediately after exiting with no stack
setup done by ATF explicitly, may cause SP_EL2 to be not sane,
which in turn causes a crash if this boot was not lucky to get
an SP_EL2 in valid range. Replace C implementation with assembly one
which does not use stack this early, and let u-boot to set up its stack
later.

Signed-off-by: Abhishek Shah <abhishek.shah@broadcom.com>
Signed-off-by: Rajesh Ravi <rajesh.ravi@broadcom.com>
Signed-off-by: Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Abhishek Shah
2020-07-15 22:48:59 +05:30
committed by Tom Rini
parent 69d8acc30b
commit ef7192e404
3 changed files with 45 additions and 0 deletions
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9
arch/arm/cpu/armv8/bcmns3/lowlevel.S
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@@ -87,3 +87,12 @@ ENTRY(__asm_flush_l3_dcache)
mov lr, x29
ret
ENDPROC(__asm_flush_l3_dcache)
ENTRY(save_boot_params)
/*
* void set_boot_params(uint64_t x0, uint64_t x1, uint64_t x2, uint64_t x3)
*/
adr x4, bl33_info
str x0, [x4]
b save_boot_params_ret
ENDPROC(save_boot_params)