Changeset 49a39c2 in mainline for arch/amd64/src/amd64.c

Timestamp:

2006-02-06T21:14:29Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

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

Children:

8a1da55

Parents:

7febdde5

Message:

Preliminary work on AMD userspace.

File:

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

arch/amd64/src/amd64.c

@@ -47 +47 @@
 #include <interrupt.h>
 
+/** Disable I/O on non-privileged levels
+ *
+ * Clean IOPL(12,13) and NT(14) flags in EFLAGS register
+ */
+static void clean_IOPL_NT_flags(void)
+{
+        asm
+        (
+                "pushfq;"
+                "pop %%rax;"
+                "and $~(0x7000),%%rax;"
+                "pushq %%rax;"
+                "popfq;"
+                :
+                :
+                :"%rax"
+        );
+}
+
+/** Disable alignment check
+ *
+ * Clean AM(18) flag in CR0 register 
+ */
+static void clean_AM_flag(void)
+{
+        asm
+        (
+                "mov %%cr0,%%rax;"
+                "and $~(0x40000),%%rax;"
+                "mov %%rax,%%cr0;"
+                :
+                :
+                :"%rax"
+        );
+}
+
 void arch_pre_mm_init(void)
 {
@@ -64 +100 @@
         /* Enable No-execute pages */
         set_efer_flag(AMD_NXE_FLAG);
+        /* Enable SYSCALL/SYSRET */
+        set_efer_flag(AMD_SCE_FLAG);
         /* Enable FPU */
         cpu_setup_fpu();
+        /* Initialize segmentation */
+        pm_init();
 
-        pm_init();
+        /* Disable I/O on nonprivileged levels
+         * clear the NT(nested-thread) flag 
+         */
+        clean_IOPL_NT_flags();
+        /* Disable alignment check */
+        clean_AM_flag();
+        
 
         if (config.cpu_active == 1) {
@@ -74 +120 @@
                 i8254_init();   /* hard clock */
 
-                exc_register(VECTOR_SYSCALL, "syscall", syscall);
-                
                 #ifdef CONFIG_SMP
                 exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown",