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[2603:800c:1201:c600:23be:43d9:7006:705a]) by smtp.gmail.com with ESMTPSA id t41-20020a056a0013a900b004e167af0c0dsm10776252pfg.89.2022.02.27.10.21.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Feb 2022 10:21:37 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 6/7] target/nios2: Special case ipending in rdctl and wrctl Date: Sun, 27 Feb 2022 08:21:24 -1000 Message-Id: <20220227182125.21809-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220227182125.21809-1-richard.henderson@linaro.org> References: <20220227182125.21809-1-richard.henderson@linaro.org> MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::435 (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::435; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x435.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: amir.gonnen@neuroblade.ai Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" It was never correct to be able to write to ipending. Until the rest of the irq code is tidied, the read of ipending will generate an "unnecessary" mask. Signed-off-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Peter Maydell --- target/nios2/translate.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/target/nios2/translate.c b/target/nios2/translate.c index 52965ba17e..b17ce25a36 100644 --- a/target/nios2/translate.c +++ b/target/nios2/translate.c @@ -452,6 +452,15 @@ static void rdctl(DisasContext *dc, uint32_t code, uint32_t flags) } switch (instr.imm5 + CR_BASE) { + case CR_IPENDING: + /* + * The value of the ipending register is synthetic. + * In hw, this is the AND of a set of hardware irq lines + * with the ienable register. In qemu, we re-use the space + * of CR_IPENDING to store the set of irq lines. + */ + tcg_gen_and_tl(cpu_R[instr.c], cpu_R[CR_IPENDING], cpu_R[CR_IENABLE]); + break; default: tcg_gen_mov_tl(cpu_R[instr.c], cpu_R[instr.imm5 + CR_BASE]); break; @@ -477,6 +486,9 @@ static void wrctl(DisasContext *dc, uint32_t code, uint32_t flags) case CR_TLBMISC: gen_helper_mmu_write_tlbmisc(cpu_env, v); break; + case CR_IPENDING: + /* ipending is read only, writes ignored. */ + break; default: tcg_gen_mov_tl(cpu_R[instr.imm5 + CR_BASE], v); break;