From: Bo Gan Date: Tue, 5 Mar 2024 18:35:39 -0800 Subject: [PATCH v4 6/7] include: sbi: add emulate_load/store handler to platform ops In-Reply-To: <1709692540-77803-1-git-send-email-ganboing@gmail.com> References: <1709692540-77803-1-git-send-email-ganboing@gmail.com> Message-ID: <1709692540-77803-7-git-send-email-ganboing@gmail.com> List-Id: To: opensbi@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit This patch allows the platform to define load/store emulators. This enables a platform to trap-and-emulate special devices or filter access to existing physical devices. Signed-off-by: Bo Gan --- include/sbi/sbi_platform.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/sbi/sbi_platform.h b/include/sbi/sbi_platform.h index 2fb33e1..f962aa4 100644 --- a/include/sbi/sbi_platform.h +++ b/include/sbi/sbi_platform.h @@ -53,6 +53,7 @@ struct sbi_domain_memregion; struct sbi_ecall_return; struct sbi_trap_regs; struct sbi_hart_features; +union sbi_ldst_data; /** Possible feature flags of a platform */ enum sbi_platform_features { @@ -139,6 +140,13 @@ struct sbi_platform_operations { int (*vendor_ext_provider)(long funcid, struct sbi_trap_regs *regs, struct sbi_ecall_return *out); + + /** platform specific handler to fixup load fault */ + int (*emulate_load)(int rlen, unsigned long addr, + union sbi_ldst_data *out_val); + /** platform specific handler to fixup store fault */ + int (*emulate_store)(int wlen, unsigned long addr, + union sbi_ldst_data in_val); }; /** Platform default per-HART stack size for exception/interrupt handling */ -- 2.7.4