Changeset 361635c in mainline for arch/ia32

Timestamp:

2005-08-25T20:58:07Z (20 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

fde6429

Parents:

cfd6efd2

Message:

Preparations for weaker preemption model.
Make all kernel stacks (i.e. startup, scheduler and thread) be STACK_SIZE bytes long.
Reincarnate "the" structure. This time, it is planned to be located at the base of each and every kernel stack.
On IA-32 and MIPS, implement get_stack_base() functions. On the rest of supported platforms, define it to be dummy.

File:

• arch/ia32/include/asm.h (modified) (2 diffs)

arch/ia32/include/asm.h

@@ -35 +35 @@
 #include <synch/spinlock.h>
 #include <arch/boot/memmap.h>
+#include <config.h>
 
 extern __u32 interrupt_handler_size;
@@ -157 +158 @@
 }
 
+/** Return base address of current stack
+ *
+ * Return the base address of the current stack.
+ * The stack is assumed to be STACK_SIZE bytes long.
+ */
+static inline __address get_stack_base(void)
+{
+        __address v;
+        
+        __asm__ volatile ("andl %%esp, %0\n" : "=r" (v) : "0" (~(STACK_SIZE-1)));
+        
+        return v;
+}
+
 #endif