diff options
| author | Chao-ying Fu <[email protected]> | 2025-07-23 13:40:10 -0700 |
|---|---|---|
| committer | Anup Patel <[email protected]> | 2025-08-28 11:00:16 +0530 |
| commit | 1ffbd063c4da252f59cc570e537a3c8821ed6967 (patch) | |
| tree | da21b8acd1b7aff627579f8eedbb3dce81763732 | |
| parent | 6a1f53bc2d91310adc44c158596dd1c3efa18080 (diff) | |
generic: mips: support harts to boot from mips_warm_boot
We program reset base for harts (other than hart 0) to boot at
mips_warm_boot that jumps to _start_warm. This helps to skip some code
sequence to speed up.
Signed-off-by: Chao-ying Fu <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>
| -rw-r--r-- | platform/generic/mips/mips_warm_boot.S | 12 | ||||
| -rw-r--r-- | platform/generic/mips/objects.mk | 2 | ||||
| -rw-r--r-- | platform/generic/mips/p8700.c | 5 |
3 files changed, 18 insertions, 1 deletions
diff --git a/platform/generic/mips/mips_warm_boot.S b/platform/generic/mips/mips_warm_boot.S new file mode 100644 index 00000000..c4a74c59 --- /dev/null +++ b/platform/generic/mips/mips_warm_boot.S @@ -0,0 +1,12 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2025 MIPS + * + */ + .text + .align 12 + .globl mips_warm_boot +mips_warm_boot: + j _start_warm + .align 2 diff --git a/platform/generic/mips/objects.mk b/platform/generic/mips/objects.mk index bbbc15a0..a08c4c63 100644 --- a/platform/generic/mips/objects.mk +++ b/platform/generic/mips/objects.mk @@ -4,5 +4,5 @@ ifeq ($(PLATFORM_RISCV_XLEN), 64) carray-platform_override_modules-$(CONFIG_PLATFORM_MIPS_P8700) += mips_p8700 -platform-objs-$(CONFIG_PLATFORM_MIPS_P8700) += mips/p8700.o +platform-objs-$(CONFIG_PLATFORM_MIPS_P8700) += mips/p8700.o mips/mips_warm_boot.o endif diff --git a/platform/generic/mips/p8700.c b/platform/generic/mips/p8700.c index 888a45c6..d3e015ba 100644 --- a/platform/generic/mips/p8700.c +++ b/platform/generic/mips/p8700.c @@ -16,6 +16,8 @@ #include <mips/p8700.h> #include <mips/mips-cm.h> +extern void mips_warm_boot(void); + static unsigned long mips_csr_read_num(int csr_num) { #define switchcase_csr_read(__csr_num, __val) \ @@ -150,6 +152,9 @@ static int mips_hart_start(u32 hartid, ulong saddr) if (hartid == 0) return SBI_ENOTSUPP; + /* Change reset base to mips_warm_boot */ + write_gcr_co_reset_base(hartid, (unsigned long)mips_warm_boot, local_p); + if (cpu_hart(hartid) == 0) { /* Ensure its coherency is disabled */ write_gcr_co_coherence(hartid, 0, local_p); |