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Fri, 15 Aug 2025 03:01:31 -0700 (PDT) Received: from hsinchu16.internal.sifive.com ([210.176.154.34]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b472d5a7a40sm879220a12.9.2025.08.15.03.01.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Aug 2025 03:01:30 -0700 (PDT) From: Yu-Chien Peter Lin To: opensbi@lists.infradead.org Subject: [RFC PATCH 3/7] platform: generic: platform: introduce fw_platform_get_reserved_pmp_count() Date: Fri, 15 Aug 2025 18:01:11 +0800 Message-ID: <20250815100116.27776-4-peter.lin@sifive.com> X-Mailer: git-send-email 2.48.0 In-Reply-To: <20250815100116.27776-1-peter.lin@sifive.com> References: <20250815100116.27776-1-peter.lin@sifive.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250815_030132_229576_2C75E8A4 X-CRM114-Status: GOOD ( 12.66 ) 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: , Cc: greentime.hu@sifive.com, Yu-Chien Peter Lin , zong.li@sifive.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "opensbi" Errors-To: opensbi-bounces+opensbi=archiver.kernel.org@lists.infradead.org Introduce fw_platform_get_reserved_pmp_count() to parse the `reserved-pmp-count` property from the opensbi-config node. Since mseccfg.{RLB,MMWP,MML} are sticky bits, we can't poll them to detect the presence of Smempp. Therefore, the only way is to parse it from FDT `riscv,isa-extensions` or `riscv,isa`. Signed-off-by: Yu-Chien Peter Lin --- platform/generic/platform.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/platform/generic/platform.c b/platform/generic/platform.c index 2e8c6051..10bc3137 100644 --- a/platform/generic/platform.c +++ b/platform/generic/platform.c @@ -67,6 +67,39 @@ default_config: return fw_platform_calculate_heap_size(hart_count); } +static u32 fw_platform_get_reserved_pmp_count(const void *fdt) +{ + int chosen_offset, config_offset, len; + u32 reserved_pmp_count; + const fdt32_t *val; + + /* + * Reserve one default entry if smepmp is enabned. + * This entry is required for sbi_hart_map_saddr(). + */ + if (fdt_has_isa_extension(fdt, "smepmp")) + reserved_pmp_count = 1; + else + reserved_pmp_count = 0; + + + /* Get the heap size from device tree */ + chosen_offset = fdt_path_offset(fdt, "/chosen"); + if (chosen_offset < 0) + goto out; + + config_offset = fdt_node_offset_by_compatible(fdt, chosen_offset, "opensbi,config"); + if (config_offset < 0) + goto out; + + val = (fdt32_t *)fdt_getprop(fdt, config_offset, "reserved-pmp-count", &len); + if (len > 0 && val) + return fdt32_to_cpu(*val) + reserved_pmp_count; + +out: + return reserved_pmp_count; +} + extern struct sbi_platform platform; static bool platform_has_mlevel_imsic = false; static u32 generic_hart_index2id[SBI_HARTMASK_MAX_BITS] = { 0 }; @@ -185,6 +218,7 @@ unsigned long fw_platform_init(unsigned long arg0, unsigned long arg1, platform.hart_count = hart_count; platform.heap_size = fw_platform_get_heap_size(fdt, hart_count); + platform.reserved_pmp_count = fw_platform_get_reserved_pmp_count(fdt); platform_has_mlevel_imsic = fdt_check_imsic_mlevel(fdt); platform.cbom_block_size = cbom_block_size; -- 2.48.0 -- opensbi mailing list opensbi@lists.infradead.org http://lists.infradead.org/mailman/listinfo/opensbi