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Korinsky" , Keith Monahan , Helge Deller , Richard Henderson Subject: [PULL 4/9] target/hppa: Implement local broadcast I/O space Date: Wed, 28 Oct 2026 19:26:46 +0100 Message-ID: <20261028182651.5950-5-deller@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261028182651.5950-1-deller@kernel.org> References: <20261028182651.5950-1-deller@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2600:3c0a:e001:78e:0:1991:8:25; envelope-from=deller@kernel.org; helo=sea.source.kernel.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: qemu development List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Keith Monahan The local broadcast I/O space is used by older operating systems like HP-UX 9.05 to send an interrupt to all CPUs, or to issue a system reset. Wire it up on the emulated 715 machine to allow HP-UX 9.05 to run. Signed-off-by: Keith Monahan Signed-off-by: Helge Deller --- hw/hppa/machine.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c index 96d57b9b0f..8d378385b2 100644 --- a/hw/hppa/machine.c +++ b/hw/hppa/machine.c @@ -573,6 +573,47 @@ static void machine_HP_common_init_tail(MachineState *machine, PCIBus *pci_bus, cpu[0]->env.kernel_entry = kernel_entry; } +/* + * Local broadcast I/O space: a write to IO_EIR (offset 0) posts an external + * interrupt on all processors, CMD_RESET (5) written to IO_COMMAND (0x30) + * resets the system. HP-UX 9 reboots through the latter. + */ +#define HPPA_BROADCAST_HPA 0xfffc0000 +#define HPPA_IO_COMMAND 0x30 +#define HPPA_CMD_RESET 5 + +static uint64_t hppa_broadcast_read(void *opaque, hwaddr addr, unsigned size) +{ + return 0; +} + +static void hppa_broadcast_write(void *opaque, hwaddr addr, uint64_t val, + unsigned size) +{ + unsigned int i; + + switch (addr) { + case 0: + for (i = 0; i < current_machine->smp.cpus; i++) { + hppa_io_eir_ops.write(cpu[i], 0, val, 4); + } + break; + case HPPA_IO_COMMAND: + if (val == HPPA_CMD_RESET) { + qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); + } + break; + } +} + +static const MemoryRegionOps hppa_broadcast_ops = { + .read = hppa_broadcast_read, + .write = hppa_broadcast_write, + .endianness = DEVICE_BIG_ENDIAN, + .valid.min_access_size = 4, + .valid.max_access_size = 4, +}; + /* * Create HP 715/64 workstation */ @@ -597,6 +638,14 @@ static void machine_HP_715_init(MachineState *machine) isa_bus = hppa_isa_bus(translate(NULL, IDE_HPA)); assert(isa_bus); + /* Local broadcast I/O space */ + MemoryRegion *dev_mr_bcast = g_new(MemoryRegion, 1); + memory_region_init_io(dev_mr_bcast, NULL, &hppa_broadcast_ops, NULL, + "local-broadcast", 0x1000); + memory_region_add_subregion(addr_space, + translate(NULL, HPPA_BROADCAST_HPA), + dev_mr_bcast); + /* Init Lasi chip */ lasi_dev = DEVICE(lasi_init()); hpm->lasi_dev = lasi_dev; -- 2.54.0