kernel/amd64: machdep: Add pre_init()

This commit introduces a pre_init() function for setting up
things that processor_init() may depend on

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 16 insertions, 4 deletions

diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c
index 1000ebf..ec1d48f 100644
--- a/sys/arch/amd64/amd64/machdep.c
+++ b/sys/arch/amd64/amd64/machdep.c
@@ -80,6 +80,20 @@ processor_halt(void)
     __ASMV("cli; hlt");
 }
 
+/*
+ * Things set up before processor_init() call...
+ */
+void
+pre_init(void)
+{
+    /*
+     * These are critical things that need to be set up as soon as possible
+     * way before the processor_init() call.
+     */
+    interrupts_init();
+    gdt_load(&g_gdtr);
+}
+
 void
 processor_init(void)
 {
@@ -88,9 +102,6 @@ processor_init(void)
 
     struct cpu_info *cur_cpu = this_cpu();
 
-    interrupts_init();
-    gdt_load(&g_gdtr);
-
     CPU_INFO_LOCK(cur_cpu);
     init_tss(cur_cpu);
 
@@ -114,5 +125,4 @@ processor_init(void)
     /* Use spectre mitigation if enabled */
     if (try_spectre_mitigate != NULL)
         try_spectre_mitigate();
-
 }
diff --git a/sys/include/sys/machdep.h b/sys/include/sys/machdep.h
index c337b17..f494f73 100644
--- a/sys/include/sys/machdep.h
+++ b/sys/include/sys/machdep.h
@@ -36,6 +36,7 @@
 #if defined(_KERNEL)
 
 __weak void processor_init(void);
+__weak void pre_init(void);
 __weak void processor_halt(void);
 
 #endif  /* defined(_KERNEL) */
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 8158bd0..8b8e431 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -73,6 +73,7 @@ list_timers(void)
 void
 main(void)
 {
+    pre_init();
     tty_init();
     syslog_init();
     PRINT_LOGO();