Changeset 37b451f7 in mainline for arch/amd64/src/syscall.c

Timestamp:

2006-02-07T02:22:44Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

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

Children:

65640fef

Parents:

dd4d6b0

Message:

Added (finally!) userspace to AMD64.
It does not work on Simics *$U&%&$&*#. Broken simics!!!
There should be probably LEA instead of MOV/ADD, but LEA does not
work in neither qemu nor bochs. Any other simulator to test? :-/

File:

• arch/amd64/src/syscall.c (modified) (3 diffs)

arch/amd64/src/syscall.c

@@ -35 +35 @@
 
 #include <print.h>
+#include <arch/cpu.h>
 
 extern void syscall_entry(void);
@@ -55 +56 @@
         write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry);
         /* Mask RFLAGS on syscall 
-         * - we do not care what is in the flags field
+         * - disable interrupts, until we exchange the stack register
+         *   (mask the IE bit)
          */
-        write_msr(AMD_MSR_SFMASK, 0);
+        write_msr(AMD_MSR_SFMASK, 0x200);
 }
 
@@ -63 +65 @@
 __native syscall_handler(__native id, __native a1, __native a2, __native a3)
 {
+        interrupts_enable();
         if (id < SYSCALL_END)
                 return syscall_table[id](a1,a2,a3);
         else
                 panic("Undefined syscall %d", id);
-        
+        interrupts_disable();
 }