Changes in kernel/generic/src/main/main.c [128359eb:f35749e] in mainline

File:

• kernel/generic/src/main/main.c (modified) (11 diffs)

kernel/generic/src/main/main.c

@@ -1 +1 @@
 /*
+ * Copyright (c) 2025 Jiri Svoboda
  * Copyright (c) 2001-2004 Jakub Jermar
  * All rights reserved.
@@ -80 +81 @@
 #include <arch/arch.h>
 #include <arch.h>
-#include <arch/faddr.h>
 #include <ipc/ipc.h>
 #include <macros.h>
@@ -111 +111 @@
 CHECK_INT_TYPE(64);
 
+task_t *kernel_task;
+
 /** Global configuration structure. */
 config_t config = {
@@ -132 +134 @@
 };
 
-context_t ctx;
-
-/** Lowest safe stack virtual address. */
-uintptr_t stack_safe = 0;
+static context_t ctx;
+
+// NOTE: All kernel stacks must be aligned to STACK_SIZE, see CURRENT.
+static const size_t bootstrap_stack_size = STACK_SIZE;
+static _Alignas(STACK_SIZE) uint8_t bootstrap_stack[STACK_SIZE];
+
+/* Just a convenient value for some assembly code. */
+uint8_t *const bootstrap_stack_top = bootstrap_stack + STACK_SIZE;
 
 /*
@@ -170 +176 @@
             ALIGN_UP((uintptr_t) kdata_end - config.base, PAGE_SIZE);
 
-        /*
-         * NOTE: All kernel stacks must be aligned to STACK_SIZE,
-         *       see CURRENT.
-         */
-
-        /* Place the stack after the kernel, init and ballocs. */
-        config.stack_base =
-            ALIGN_UP(config.base + config.kernel_size, STACK_SIZE);
-        config.stack_size = STACK_SIZE;
-
-        /* Avoid placing stack on top of init */
-        size_t i;
-        for (i = 0; i < init.cnt; i++) {
-                uintptr_t p = init.tasks[i].paddr + init.tasks[i].size;
-                uintptr_t bottom = PA2KA(ALIGN_UP(p, STACK_SIZE));
-
-                if (config.stack_base < bottom)
-                        config.stack_base = bottom;
-        }
-
-        /* Avoid placing stack on top of boot allocations. */
-        if (ballocs.size) {
-                uintptr_t bottom =
-                    ALIGN_UP(ballocs.base + ballocs.size, STACK_SIZE);
-                if (config.stack_base < bottom)
-                        config.stack_base = bottom;
-        }
-
-        if (config.stack_base < stack_safe)
-                config.stack_base = ALIGN_UP(stack_safe, STACK_SIZE);
-
-        context_save(&ctx);
-        context_set(&ctx, FADDR(main_bsp_separated_stack),
-            config.stack_base, STACK_SIZE);
+        context_create(&ctx, main_bsp_separated_stack,
+            bootstrap_stack, bootstrap_stack_size);
         context_restore(&ctx);
         /* not reached */
@@ -220 +194 @@
         version_print();
 
-        LOG("\nconfig.base=%p config.kernel_size=%zu"
-            "\nconfig.stack_base=%p config.stack_size=%zu",
-            (void *) config.base, config.kernel_size,
-            (void *) config.stack_base, config.stack_size);
+        LOG("\nconfig.base=%p config.kernel_size=%zu",
+            (void *) config.base, config.kernel_size);
 
 #ifdef CONFIG_KCONSOLE
@@ -304 +276 @@
                 panic("Cannot create kernel task.");
 
+        kernel_task = kernel;
+
         /*
          * Create the first thread.
@@ -311 +285 @@
         if (!kinit_thread)
                 panic("Cannot create kinit thread.");
-        thread_ready(kinit_thread);
-
-        /*
-         * This call to scheduler() will return to kinit,
+        thread_start(kinit_thread);
+        thread_detach(kinit_thread);
+
+        /*
+         * This call to scheduler_run() will return to kinit,
          * starting the thread of kernel threads.
          */
-        scheduler();
+        current_copy(CURRENT, (current_t *) CPU_LOCAL->stack);
+        context_replace(scheduler_run, CPU_LOCAL->stack, STACK_SIZE);
         /* not reached */
 }
@@ -357 +333 @@
         ARCH_OP(post_cpu_init);
 
-        current_copy(CURRENT, (current_t *) CPU->stack);
-
         /*
          * If we woke kmp up before we left the kernel stack, we could
@@ -364 +338 @@
          * switch to this cpu's private stack prior to waking kmp up.
          */
-        context_save(&CPU->saved_context);
-        context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
-            (uintptr_t) CPU->stack, STACK_SIZE);
-        context_restore(&CPU->saved_context);
+        current_copy(CURRENT, (current_t *) CPU_LOCAL->stack);
+        context_replace(main_ap_separated_stack, CPU_LOCAL->stack, STACK_SIZE);
         /* not reached */
 }
@@ -383 +355 @@
         timeout_init();
 
-        waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
-        scheduler();
+        semaphore_up(&ap_completion_semaphore);
+        scheduler_run();
         /* not reached */
 }