x86: Move paging functions into cpu.c

[karo-tx-uboot.git] / arch / x86 / cpu / cpu.c

diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 623e3af61f032b2b266e15c71c7f2dcf729e8734..7a4de2982427d7fad750221ca77115e0732a7c2f 100644 (file)
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -240,3 +240,38 @@ int icache_status(void)
 {
        return 1;
 }
+
+void cpu_enable_paging_pae(ulong cr3)
+{
+       __asm__ __volatile__(
+               /* Load the page table address */
+               "movl   %0, %%cr3\n"
+               /* Enable pae */
+               "movl   %%cr4, %%eax\n"
+               "orl    $0x00000020, %%eax\n"
+               "movl   %%eax, %%cr4\n"
+               /* Enable paging */
+               "movl   %%cr0, %%eax\n"
+               "orl    $0x80000000, %%eax\n"
+               "movl   %%eax, %%cr0\n"
+               :
+               : "r" (cr3)
+               : "eax");
+}
+
+void cpu_disable_paging_pae(void)
+{
+       /* Turn off paging */
+       __asm__ __volatile__ (
+               /* Disable paging */
+               "movl   %%cr0, %%eax\n"
+               "andl   $0x7fffffff, %%eax\n"
+               "movl   %%eax, %%cr0\n"
+               /* Disable pae */
+               "movl   %%cr4, %%eax\n"
+               "andl   $0xffffffdf, %%eax\n"
+               "movl   %%eax, %%cr4\n"
+               :
+               :
+               : "eax");
+}