Changes in uspace/lib/libc/arch/ia32/src/entry.s [c98e6ee:47246f4] in mainline

File:

• uspace/lib/libc/arch/ia32/src/entry.s (modified) (3 diffs)

uspace/lib/libc/arch/ia32/src/entry.s

@@ -27 +27 @@
 #
 
+INTEL_CPUID_STANDARD = 1
+INTEL_SEP = 11
+
 .section .init, "ax"
 
@@ -35 +38 @@
 ## User-space task entry point
 #
-# %ebx contains the PCB pointer
+# %edi contains the PCB pointer
 #
 __entry:
@@ -44 +47 @@
         # Do not set %gs, it contains descriptor that can see TLS
 
+        # Detect the mechanism used for making syscalls
+        movl $(INTEL_CPUID_STANDARD), %eax
+        cpuid
+        bt $(INTEL_SEP), %edx
+        jnc 0f
+        leal __syscall_fast_func, %eax
+        movl $__syscall_fast, (%eax)
+0:
+        #
+        # Create the first stack frame.
+        #
+        pushl $0 
+        movl %esp, %ebp
+
         # Pass the PCB pointer to __main as the first argument
-        pushl %ebx
+        pushl %edi
         call __main