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Fri, 05 Jan 2024 02:24:45 -0800 (PST) From: =?UTF-8?q?Cl=C3=A9ment=20Chigot?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Cl=C3=A9ment=20Chigot?= , Frederic Konrad Subject: [PATCH 8/9] leon3: check cpu_id in the tiny bootloader Date: Fri, 5 Jan 2024 11:24:20 +0100 Message-Id: <20240105102421.163554-9-chigot@adacore.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240105102421.163554-1-chigot@adacore.com> References: <20240105102421.163554-1-chigot@adacore.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42f; envelope-from=chigot@adacore.com; helo=mail-wr1-x42f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @adacore.com) X-ZM-MESSAGEID: 1704450327880100001 Now that SMP is possible, the asr17 must be checked in the little boot code or the secondary CPU will reinitialize the Timer and the Uart. Co-developed-by: Frederic Konrad Signed-off-by: Cl=C3=A9ment Chigot --- hw/sparc/leon3.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/hw/sparc/leon3.c b/hw/sparc/leon3.c index 38fb8d9af1..7498eaa827 100644 --- a/hw/sparc/leon3.c +++ b/hw/sparc/leon3.c @@ -98,13 +98,27 @@ static uint32_t *gen_store_u32(uint32_t *code, hwaddr a= ddr, uint32_t val) =20 /* * When loading a kernel in RAM the machine is expected to be in a differe= nt - * state (eg: initialized by the bootloader). This little code reproduces - * this behavior. + * state (eg: initialized by the bootloader). This little code reproduces + * this behavior. Also this code can be executed by the secondary cpus as + * well since it looks at the %asr17 register before doing any + * initialization, it allows to use the same reset address for all the + * cpus. */ static void write_bootloader(CPUSPARCState *env, uint8_t *base, hwaddr kernel_addr) { uint32_t *p =3D (uint32_t *) base; + uint32_t *sec_cpu_branch_p =3D NULL; + + /* If we are running on a secondary CPU, jump directly to the kernel. = */ + + stl_p(p++, 0x85444000); /* rd %asr17, %g2 */ + stl_p(p++, 0x8530a01c); /* srl %g2, 0x1c, %g2 */ + stl_p(p++, 0x80908000); /* tst %g2 */ + /* Fill that later. */ + sec_cpu_branch_p =3D p; + stl_p(p++, 0x0BADC0DE); /* bne xxx */ + stl_p(p++, 0x01000000); /* nop */ =20 /* Initialize the UARTs */ /* *UART_CONTROL =3D UART_RECEIVE_ENABLE | UART_TRANSMIT_ENABLE; */ @@ -118,6 +132,10 @@ static void write_bootloader(CPUSPARCState *env, uint8= _t *base, /* *GPTIMER0_CONFIG =3D GPTIMER_ENABLE | GPTIMER_RESTART; */ p =3D gen_store_u32(p, 0x80000318, 3); =20 + /* Now, the relative branch above can be computed. */ + stl_p(sec_cpu_branch_p, 0x12800000 + + (p - sec_cpu_branch_p)); + /* JUMP to the entry point */ stl_p(p++, 0x82100000); /* mov %g0, %g1 */ stl_p(p++, 0x03000000 + extract32(kernel_addr, 10, 22)); --=20 2.25.1