I8K: allow i8k driver to be built on x86_64 systems

Adds #if clause and additional inline assembly so that the driver
builds on x86_64 systems.

Signed-off-by: Bradley Smith <bradjsmith@btinternet.com>
Cc: Frank Sorenson <frank@tuxrocks.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 28 insertions, 1 deletions

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 179223a17414..3d181021a862 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -113,6 +113,33 @@ static int i8k_smm(struct smm_regs *regs)
         int rc;
         int eax = regs->eax;
 
+#if defined(CONFIG_X86_64)
+        asm("pushq %%rax\n\t"
+                "movl 0(%%rax),%%edx\n\t"
+                "pushq %%rdx\n\t"
+                "movl 4(%%rax),%%ebx\n\t"
+                "movl 8(%%rax),%%ecx\n\t"
+                "movl 12(%%rax),%%edx\n\t"
+                "movl 16(%%rax),%%esi\n\t"
+                "movl 20(%%rax),%%edi\n\t"
+                "popq %%rax\n\t"
+                "out %%al,$0xb2\n\t"
+                "out %%al,$0x84\n\t"
+                "xchgq %%rax,(%%rsp)\n\t"
+                "movl %%ebx,4(%%rax)\n\t"
+                "movl %%ecx,8(%%rax)\n\t"
+                "movl %%edx,12(%%rax)\n\t"
+                "movl %%esi,16(%%rax)\n\t"
+                "movl %%edi,20(%%rax)\n\t"
+                "popq %%rdx\n\t"
+                "movl %%edx,0(%%rax)\n\t"
+                "lahf\n\t"
+                "shrl $8,%%eax\n\t"
+                "andl $1,%%eax\n"
+                :"=a"(rc)
+                :    "a"(regs)
+                :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
+#else
         asm("pushl %%eax\n\t"
             "movl 0(%%eax),%%edx\n\t"
             "push %%edx\n\t"
@@ -137,7 +164,7 @@ static int i8k_smm(struct smm_regs *regs)
             "andl $1,%%eax\n":"=a"(rc)
             :    "a"(regs)
             :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
-
+#endif
         if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
                 return -EINVAL;