Simplify POST entry code by moving reboot logic from post.c to resume.c.

Detect a resume/reboot by inspecting HaveRunPost instead of inspecting
the cmos reset code.  Inspecting a global variable is both simpler and
safer.

Move the reboot logic from post.c to resume.c - this makes the code in
post.c simpler as it is now only called once on machine startup.  This
also makes it easier to ensure all POST initialization code resides in
the relocatable "init" sections.

Also, rename _start() to handle_post() so that it is more in keeping
with the entry_xxx() and handle_xxx() function naming.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/util.h b/src/util.h
index 303c524..4319f63 100644
--- a/src/util.h
+++ b/src/util.h
@@ -61,6 +61,15 @@ static inline void cpuid(u32 index, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
         : "0" (index));
 }
 
+static inline u32 getcr0(void) {
+    u32 cr0;
+    asm("movl %%cr0, %0" : "=r"(cr0));
+    return cr0;
+}
+static inline void setcr0(u32 cr0) {
+    asm("movl %0, %%cr0" : : "r"(cr0));
+}
+
 static inline u64 rdmsr(u32 index)
 {
     u64 ret;
@@ -424,6 +433,7 @@ void enable_bootsplash(void);
 void disable_bootsplash(void);
 
 // resume.c
+extern int HaveRunPost;
 void init_dma(void);
 
 // pnpbios.c