mini-os: switched initial C entry point to arch_init

Signed-off-by: Karim Allah Ahmed <karim.allah.ahmed@gmail.com>
[talex5@gmail.com: separated from big ARM commit]
[talex5@gmail.com: restored comment, moved prototypes to headers]
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
[talex5@gmail.com: restored stack address printk on x86]
[talex5@gmail.com: moved first printk's after start_info setup on x86]
Signed-off-by: Thomas Leonard <talex5@gmail.com>

extras/mini-os/arch/x86/setup.c

@@ -28,6 +28,8 @@
 
 #include <mini-os/os.h>
 #include <mini-os/lib.h> /* for printk, memcpy */
+#include <mini-os/kernel.h>
+#include <xen/xen.h>
 
 /*
  * Shared page for communicating with the hypervisor.
@@ -87,20 +89,45 @@ static inline void sse_init(void) {
 #define sse_init()
 #endif
 
+
+/*
+ * INITIAL C ENTRY POINT.
+ */
 void
 arch_init(start_info_t *si)
 {
-	/*Initialize floating point unit */
-        fpu_init();
+	static char hello[] = "Bootstrapping...\n";
 
-        /* Initialize SSE */
-        sse_init();
+	(void)HYPERVISOR_console_io(CONSOLEIO_write, strlen(hello), hello);
+
+	trap_init();
+
+	/*Initialize floating point unit */
+	fpu_init();
+
+	/* Initialize SSE */
+	sse_init();
 
 	/* Copy the start_info struct to a globally-accessible area. */
 	/* WARN: don't do printk before here, it uses information from
 	   shared_info. Use xprintk instead. */
 	memcpy(&start_info, si, sizeof(*si));
 
+	/* print out some useful information  */
+	printk("Xen Minimal OS!\n");
+	printk("  start_info: %p(VA)\n", si);
+	printk("    nr_pages: 0x%lx\n", si->nr_pages);
+	printk("  shared_inf: 0x%08lx(MA)\n", si->shared_info);
+	printk("     pt_base: %p(VA)\n", (void *)si->pt_base);
+	printk("nr_pt_frames: 0x%lx\n", si->nr_pt_frames);
+	printk("    mfn_list: %p(VA)\n", (void *)si->mfn_list);
+	printk("   mod_start: 0x%lx(VA)\n", si->mod_start);
+	printk("     mod_len: %lu\n", si->mod_len);
+	printk("       flags: 0x%x\n", (unsigned int)si->flags);
+	printk("    cmd_line: %s\n",
+			si->cmd_line ? (const char *)si->cmd_line : "NULL");
+	printk("       stack: %p-%p\n", stack, stack + sizeof(stack));
+
 	/* set up minimal memory infos */
 	phys_to_machine_mapping = (unsigned long *)start_info.mfn_list;
 
@@ -118,12 +145,15 @@ arch_init(start_info_t *si)
 		(unsigned long)failsafe_callback, 0);
 #endif
 
-
+	start_kernel();
 }
 
 void
 arch_fini(void)
 {
+	/* Reset traps */
+	trap_fini();
+
 #ifdef __i386__
 	HYPERVISOR_set_callbacks(0, 0, 0, 0);
 #else
@@ -132,9 +162,7 @@ arch_fini(void)
 }
 
 void
-arch_print_info(void)
+arch_do_exit(void)
 {
-	printk("  stack:      %p-%p\n", stack, stack + sizeof(stack));
+	stack_walk();
 }
-
-

extras/mini-os/arch/x86/x86_32.S

@@ -20,7 +20,7 @@ _start:
         lss stack_start,%esp
         andl $(~(__STACK_SIZE-1)), %esp
         push %esi 
-        call start_kernel
+        call arch_init
 
 stack_start:
 	.long stack+(2*__STACK_SIZE), __KERNEL_SS

extras/mini-os/arch/x86/x86_64.S

@@ -21,7 +21,7 @@ _start:
         movq stack_start(%rip),%rsp
         andq $(~(__STACK_SIZE-1)), %rsp
         movq %rsi,%rdi
-        call start_kernel
+        call arch_init
 
 stack_start:
         .quad stack+(2*__STACK_SIZE)

extras/mini-os/include/kernel.h

@@ -1,7 +1,9 @@
 #ifndef _KERNEL_H_
 #define _KERNEL_H_
 
-extern void do_exit(void) __attribute__((noreturn));
-extern void stop_kernel(void);
+void start_kernel(void);
+void do_exit(void) __attribute__((noreturn));
+void arch_do_exit(void);
+void stop_kernel(void);
 
 #endif /* _KERNEL_H_ */

extras/mini-os/include/x86/os.h

@@ -64,8 +64,6 @@ extern shared_info_t *HYPERVISOR_shared_info;
 void trap_init(void);
 void trap_fini(void);
 
-void arch_init(start_info_t *si);
-void arch_print_info(void);
 void arch_fini(void);
 
 

extras/mini-os/kernel.c

@@ -28,6 +28,7 @@
  */
 
 #include <mini-os/os.h>
+#include <mini-os/kernel.h>
 #include <mini-os/hypervisor.h>
 #include <mini-os/mm.h>
 #include <mini-os/events.h>
@@ -114,41 +115,14 @@ __attribute__((weak)) int app_main(start_info_t *si)
     return 0;
 }
 
-/*
- * INITIAL C ENTRY POINT.
- */
-void start_kernel(start_info_t *si)
+void start_kernel(void)
 {
-    static char hello[] = "Bootstrapping...\n";
-
-    (void)HYPERVISOR_console_io(CONSOLEIO_write, strlen(hello), hello);
-
-    arch_init(si);
-
-    trap_init();
-
-    /* print out some useful information  */
-    printk("Xen Minimal OS!\n");
-    printk("  start_info: %p(VA)\n", si);
-    printk("    nr_pages: 0x%lx\n", si->nr_pages);
-    printk("  shared_inf: 0x%08lx(MA)\n", si->shared_info);
-    printk("     pt_base: %p(VA)\n", (void *)si->pt_base); 
-    printk("nr_pt_frames: 0x%lx\n", si->nr_pt_frames);
-    printk("    mfn_list: %p(VA)\n", (void *)si->mfn_list); 
-    printk("   mod_start: 0x%lx(VA)\n", si->mod_start);
-    printk("     mod_len: %lu\n", si->mod_len); 
-    printk("       flags: 0x%x\n", (unsigned int)si->flags);
-    printk("    cmd_line: %s\n",  
-           si->cmd_line ? (const char *)si->cmd_line : "NULL");
-
     /* Set up events. */
     init_events();
-    
+
     /* ENABLE EVENT DELIVERY. This is disabled at start of day. */
     __sti();
 
-    arch_print_info();
-
     setup_xen_features();
 
     /* Init memory management. */
@@ -201,9 +175,6 @@ void stop_kernel(void)
     /* Reset events. */
     fini_events();
 
-    /* Reset traps */
-    trap_fini();
-
     /* Reset arch details */
     arch_fini();
 }
@@ -218,7 +189,7 @@ void stop_kernel(void)
 void do_exit(void)
 {
     printk("Do_exit called!\n");
-    stack_walk();
+    arch_do_exit();
     for( ;; )
     {
         struct sched_shutdown sched_shutdown = { .reason = SHUTDOWN_crash };