| Message ID | 20240203163631.177508-6-raymond.mao@linaro.org |
|---|---|
| State | Accepted |
| Commit | 11f3171256337dfb81ead526bb2dd78503839882 |
| Delegated to: | Tom Rini |
| Headers | show |
| Series | Handoff bloblist from previous boot stage | expand |
On Sat, 3 Feb 2024 at 18:38, Raymond Mao <raymond.mao@linaro.org> wrote: > > Save boot arguments x[0-3] into an array for handover of bloblist from > previous boot stage. > > Signed-off-by: Raymond Mao <raymond.mao@linaro.org> > Suggested-by: Ard Biesheuvel <ardb@kernel.org> > --- > Changes in v2 > - New patch file created for v2. > Changes in V5 > - Drop the dependence on OF_BOARD. > Changes in V7 > - Exclude the saved_args when BLOBLIST is disabled. > Changes in V8 > - Use PC-relative reference for saved_args. > - Add 4-byte alignment for saved_args. > > arch/arm/cpu/armv8/start.S | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > > diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S > index 6cc1d26e5e..7461280261 100644 > --- a/arch/arm/cpu/armv8/start.S > +++ b/arch/arm/cpu/armv8/start.S > @@ -370,5 +370,28 @@ ENTRY(c_runtime_cpu_setup) > ENDPROC(c_runtime_cpu_setup) > > WEAK(save_boot_params) > +#if (IS_ENABLED(CONFIG_BLOBLIST)) > + /* Calculate the PC-relative address of saved_args */ > + adr x9, saved_args_offset > + ldr w10, saved_args_offset > + add x9, x9, w10, sxtw > + > + stp x0, x1, [x9] > + stp x2, x3, [x9, #16] > +#endif > b save_boot_params_ret /* back to my caller */ > ENDPROC(save_boot_params) > + > +#if (IS_ENABLED(CONFIG_BLOBLIST)) > +saved_args_offset: > + .long saved_args - . /* offset from current code to save_args */ > + > + .section .data > + .align 2 > + .global saved_args > +saved_args: > + .rept 4 > + .dword 0 > + .endr > +END(saved_args) > +#endif > -- > 2.25.1 > Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S index 6cc1d26e5e..7461280261 100644 --- a/arch/arm/cpu/armv8/start.S +++ b/arch/arm/cpu/armv8/start.S @@ -370,5 +370,28 @@ ENTRY(c_runtime_cpu_setup) ENDPROC(c_runtime_cpu_setup) WEAK(save_boot_params) +#if (IS_ENABLED(CONFIG_BLOBLIST)) + /* Calculate the PC-relative address of saved_args */ + adr x9, saved_args_offset + ldr w10, saved_args_offset + add x9, x9, w10, sxtw + + stp x0, x1, [x9] + stp x2, x3, [x9, #16] +#endif b save_boot_params_ret /* back to my caller */ ENDPROC(save_boot_params) + +#if (IS_ENABLED(CONFIG_BLOBLIST)) +saved_args_offset: + .long saved_args - . /* offset from current code to save_args */ + + .section .data + .align 2 + .global saved_args +saved_args: + .rept 4 + .dword 0 + .endr +END(saved_args) +#endif
Save boot arguments x[0-3] into an array for handover of bloblist from previous boot stage. Signed-off-by: Raymond Mao <raymond.mao@linaro.org> Suggested-by: Ard Biesheuvel <ardb@kernel.org> --- Changes in v2 - New patch file created for v2. Changes in V5 - Drop the dependence on OF_BOARD. Changes in V7 - Exclude the saved_args when BLOBLIST is disabled. Changes in V8 - Use PC-relative reference for saved_args. - Add 4-byte alignment for saved_args. arch/arm/cpu/armv8/start.S | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)