Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 264 insertions, 0 deletions

diff --git a/arch/mips/kernel/machine_kexec.c b/arch/mips/kernel/machine_kexec.c
new file mode 100644
index 000000000..432bfd3e7
--- /dev/null
+++ b/arch/mips/kernel/machine_kexec.c
@@ -0,0 +1,264 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * machine_kexec.c for kexec
+ * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
+ */
+#include <linux/compiler.h>
+#include <linux/kexec.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/libfdt.h>
+
+#include <asm/cacheflush.h>
+#include <asm/page.h>
+
+extern const unsigned char relocate_new_kernel[];
+extern const size_t relocate_new_kernel_size;
+
+extern unsigned long kexec_start_address;
+extern unsigned long kexec_indirection_page;
+
+static unsigned long reboot_code_buffer;
+
+#ifdef CONFIG_SMP
+static void (*relocated_kexec_smp_wait)(void *);
+
+atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+void (*_crash_smp_send_stop)(void) = NULL;
+#endif
+
+void (*_machine_kexec_shutdown)(void) = NULL;
+void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
+
+static void kexec_image_info(const struct kimage *kimage)
+{
+        unsigned long i;
+
+        pr_debug("kexec kimage info:\n");
+        pr_debug("  type:        %d\n", kimage->type);
+        pr_debug("  start:       %lx\n", kimage->start);
+        pr_debug("  head:        %lx\n", kimage->head);
+        pr_debug("  nr_segments: %lu\n", kimage->nr_segments);
+
+        for (i = 0; i < kimage->nr_segments; i++) {
+                pr_debug("    segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
+                        i,
+                        kimage->segment[i].mem,
+                        kimage->segment[i].mem + kimage->segment[i].memsz,
+                        (unsigned long)kimage->segment[i].memsz,
+                        (unsigned long)kimage->segment[i].memsz /  PAGE_SIZE);
+        }
+}
+
+#ifdef CONFIG_UHI_BOOT
+
+static int uhi_machine_kexec_prepare(struct kimage *kimage)
+{
+        int i;
+
+        /*
+         * In case DTB file is not passed to the new kernel, a flat device
+         * tree will be created by kexec tool. It holds modified command
+         * line for the new kernel.
+         */
+        for (i = 0; i < kimage->nr_segments; i++) {
+                struct fdt_header fdt;
+
+                if (kimage->segment[i].memsz <= sizeof(fdt))
+                        continue;
+
+                if (copy_from_user(&fdt, kimage->segment[i].buf, sizeof(fdt)))
+                        continue;
+
+                if (fdt_check_header(&fdt))
+                        continue;
+
+                kexec_args[0] = -2;
+                kexec_args[1] = (unsigned long)
+                        phys_to_virt((unsigned long)kimage->segment[i].mem);
+                break;
+        }
+
+        return 0;
+}
+
+int (*_machine_kexec_prepare)(struct kimage *) = uhi_machine_kexec_prepare;
+
+#else
+
+int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+
+#endif /* CONFIG_UHI_BOOT */
+
+int
+machine_kexec_prepare(struct kimage *kimage)
+{
+#ifdef CONFIG_SMP
+        if (!kexec_nonboot_cpu_func())
+                return -EINVAL;
+#endif
+
+        kexec_image_info(kimage);
+
+        if (_machine_kexec_prepare)
+                return _machine_kexec_prepare(kimage);
+
+        return 0;
+}
+
+void
+machine_kexec_cleanup(struct kimage *kimage)
+{
+}
+
+#ifdef CONFIG_SMP
+static void kexec_shutdown_secondary(void *param)
+{
+        int cpu = smp_processor_id();
+
+        if (!cpu_online(cpu))
+                return;
+
+        /* We won't be sent IPIs any more. */
+        set_cpu_online(cpu, false);
+
+        local_irq_disable();
+        while (!atomic_read(&kexec_ready_to_reboot))
+                cpu_relax();
+
+        kexec_reboot();
+
+        /* NOTREACHED */
+}
+#endif
+
+void
+machine_shutdown(void)
+{
+        if (_machine_kexec_shutdown)
+                _machine_kexec_shutdown();
+
+#ifdef CONFIG_SMP
+        smp_call_function(kexec_shutdown_secondary, NULL, 0);
+
+        while (num_online_cpus() > 1) {
+                cpu_relax();
+                mdelay(1);
+        }
+#endif
+}
+
+void
+machine_crash_shutdown(struct pt_regs *regs)
+{
+        if (_machine_crash_shutdown)
+                _machine_crash_shutdown(regs);
+        else
+                default_machine_crash_shutdown(regs);
+}
+
+#ifdef CONFIG_SMP
+void kexec_nonboot_cpu_jump(void)
+{
+        local_flush_icache_range((unsigned long)relocated_kexec_smp_wait,
+                                 reboot_code_buffer + relocate_new_kernel_size);
+
+        relocated_kexec_smp_wait(NULL);
+}
+#endif
+
+void kexec_reboot(void)
+{
+        void (*do_kexec)(void) __noreturn;
+
+        /*
+         * We know we were online, and there will be no incoming IPIs at
+         * this point. Mark online again before rebooting so that the crash
+         * analysis tool will see us correctly.
+         */
+        set_cpu_online(smp_processor_id(), true);
+
+        /* Ensure remote CPUs observe that we're online before rebooting. */
+        smp_mb__after_atomic();
+
+#ifdef CONFIG_SMP
+        if (smp_processor_id() > 0) {
+                /*
+                 * Instead of cpu_relax() or wait, this is needed for kexec
+                 * smp reboot. Kdump usually doesn't require an smp new
+                 * kernel, but kexec may do.
+                 */
+                kexec_nonboot_cpu();
+
+                /* NOTREACHED */
+        }
+#endif
+
+        /*
+         * Make sure we get correct instructions written by the
+         * machine_kexec() CPU.
+         */
+        local_flush_icache_range(reboot_code_buffer,
+                                 reboot_code_buffer + relocate_new_kernel_size);
+
+        do_kexec = (void *)reboot_code_buffer;
+        do_kexec();
+}
+
+void
+machine_kexec(struct kimage *image)
+{
+        unsigned long entry;
+        unsigned long *ptr;
+
+        reboot_code_buffer =
+          (unsigned long)page_address(image->control_code_page);
+
+        kexec_start_address =
+                (unsigned long) phys_to_virt(image->start);
+
+        if (image->type == KEXEC_TYPE_DEFAULT) {
+                kexec_indirection_page =
+                        (unsigned long) phys_to_virt(image->head & PAGE_MASK);
+        } else {
+                kexec_indirection_page = (unsigned long)&image->head;
+        }
+
+        memcpy((void*)reboot_code_buffer, relocate_new_kernel,
+               relocate_new_kernel_size);
+
+        /*
+         * The generic kexec code builds a page list with physical
+         * addresses. they are directly accessible through KSEG0 (or
+         * CKSEG0 or XPHYS if on 64bit system), hence the
+         * phys_to_virt() call.
+         */
+        for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
+             ptr = (entry & IND_INDIRECTION) ?
+               phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
+                if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
+                    *ptr & IND_DESTINATION)
+                        *ptr = (unsigned long) phys_to_virt(*ptr);
+        }
+
+        /* Mark offline BEFORE disabling local irq. */
+        set_cpu_online(smp_processor_id(), false);
+
+        /*
+         * we do not want to be bothered.
+         */
+        local_irq_disable();
+
+        printk("Will call new kernel at %08lx\n", image->start);
+        printk("Bye ...\n");
+        /* Make reboot code buffer available to the boot CPU. */
+        __flush_cache_all();
+#ifdef CONFIG_SMP
+        /* All secondary cpus now may jump to kexec_wait cycle */
+        relocated_kexec_smp_wait = reboot_code_buffer +
+                (void *)(kexec_smp_wait - relocate_new_kernel);
+        smp_wmb();
+        atomic_set(&kexec_ready_to_reboot, 1);
+#endif
+        kexec_reboot();
+}