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Wed, 23 Jul 2025 13:40:25 -0700 (PDT) Received: from localhost.localdomain ([50.175.154.178]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23e3b6b4c81sm102398255ad.114.2025.07.23.13.40.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Jul 2025 13:40:24 -0700 (PDT) From: Chao-ying Fu X-Google-Original-From: Chao-ying Fu To: opensbi@lists.infradead.org Cc: Chao-ying Fu Subject: [PATCH v3] generic: mips: support harts to boot from mips_warm_boot Date: Wed, 23 Jul 2025 13:40:10 -0700 Message-ID: <20250723204010.9927-1-cfu@mips.com> X-Mailer: git-send-email 2.47.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250723_134026_963949_3B6F7044 X-CRM114-Status: GOOD ( 15.47 ) X-BeenThere: opensbi@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "opensbi" Errors-To: opensbi-bounces+opensbi=archiver.kernel.org@lists.infradead.org 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 --- platform/generic/mips/mips_warm_boot.S | 20 ++++++++++++++++++++ platform/generic/mips/objects.mk | 2 +- platform/generic/mips/p8700.c | 5 +++++ 3 files changed, 26 insertions(+), 1 deletion(-) create mode 100644 platform/generic/mips/mips_warm_boot.S diff --git a/platform/generic/mips/mips_warm_boot.S b/platform/generic/mips/mips_warm_boot.S new file mode 100644 index 0000000..25cdb83 --- /dev/null +++ b/platform/generic/mips/mips_warm_boot.S @@ -0,0 +1,20 @@ +/* + * 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 +nmi_vector: + j _start_warm + .align 2 +cacheerr_vector: + j _start_warm + .align 2 +debugexc_vector: + j _start_warm diff --git a/platform/generic/mips/objects.mk b/platform/generic/mips/objects.mk index bbbc15a..a08c4c6 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 888a45c..d3e015b 100644 --- a/platform/generic/mips/p8700.c +++ b/platform/generic/mips/p8700.c @@ -16,6 +16,8 @@ #include #include +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); -- 2.47.1 -- opensbi mailing list opensbi@lists.infradead.org http://lists.infradead.org/mailman/listinfo/opensbi