i386: move power

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 133 insertions, 0 deletions

diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
new file mode 100644
index 000000000000..998fd3ec0d68
--- /dev/null
+++ b/arch/x86/power/cpu.c
@@ -0,0 +1,133 @@
+/*
+ * Suspend support specific for i386.
+ *
+ * Distribute under GPLv2
+ *
+ * Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
+ */
+
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <asm/mtrr.h>
+#include <asm/mce.h>
+
+static struct saved_context saved_context;
+
+unsigned long saved_context_ebx;
+unsigned long saved_context_esp, saved_context_ebp;
+unsigned long saved_context_esi, saved_context_edi;
+unsigned long saved_context_eflags;
+
+void __save_processor_state(struct saved_context *ctxt)
+{
+        mtrr_save_fixed_ranges(NULL);
+        kernel_fpu_begin();
+
+        /*
+         * descriptor tables
+         */
+        store_gdt(&ctxt->gdt);
+        store_idt(&ctxt->idt);
+        store_tr(ctxt->tr);
+
+        /*
+         * segment registers
+         */
+        savesegment(es, ctxt->es);
+        savesegment(fs, ctxt->fs);
+        savesegment(gs, ctxt->gs);
+        savesegment(ss, ctxt->ss);
+
+        /*
+         * control registers 
+         */
+        ctxt->cr0 = read_cr0();
+        ctxt->cr2 = read_cr2();
+        ctxt->cr3 = read_cr3();
+        ctxt->cr4 = read_cr4();
+}
+
+void save_processor_state(void)
+{
+        __save_processor_state(&saved_context);
+}
+
+static void do_fpu_end(void)
+{
+        /*
+         * Restore FPU regs if necessary.
+         */
+        kernel_fpu_end();
+}
+
+static void fix_processor_context(void)
+{
+        int cpu = smp_processor_id();
+        struct tss_struct * t = &per_cpu(init_tss, cpu);
+
+        set_tss_desc(cpu,t);    /* This just modifies memory; should not be necessary. But... This is necessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
+
+        load_TR_desc();                         /* This does ltr */
+        load_LDT(&current->active_mm->context); /* This does lldt */
+
+        /*
+         * Now maybe reload the debug registers
+         */
+        if (current->thread.debugreg[7]){
+                set_debugreg(current->thread.debugreg[0], 0);
+                set_debugreg(current->thread.debugreg[1], 1);
+                set_debugreg(current->thread.debugreg[2], 2);
+                set_debugreg(current->thread.debugreg[3], 3);
+                /* no 4 and 5 */
+                set_debugreg(current->thread.debugreg[6], 6);
+                set_debugreg(current->thread.debugreg[7], 7);
+        }
+
+}
+
+void __restore_processor_state(struct saved_context *ctxt)
+{
+        /*
+         * control registers
+         */
+        write_cr4(ctxt->cr4);
+        write_cr3(ctxt->cr3);
+        write_cr2(ctxt->cr2);
+        write_cr0(ctxt->cr0);
+
+        /*
+         * now restore the descriptor tables to their proper values
+         * ltr is done i fix_processor_context().
+         */
+        load_gdt(&ctxt->gdt);
+        load_idt(&ctxt->idt);
+
+        /*
+         * segment registers
+         */
+        loadsegment(es, ctxt->es);
+        loadsegment(fs, ctxt->fs);
+        loadsegment(gs, ctxt->gs);
+        loadsegment(ss, ctxt->ss);
+
+        /*
+         * sysenter MSRs
+         */
+        if (boot_cpu_has(X86_FEATURE_SEP))
+                enable_sep_cpu();
+
+        fix_processor_context();
+        do_fpu_end();
+        mtrr_ap_init();
+        mcheck_init(&boot_cpu_data);
+}
+
+void restore_processor_state(void)
+{
+        __restore_processor_state(&saved_context);
+}
+
+/* Needed by apm.c */
+EXPORT_SYMBOL(save_processor_state);
+EXPORT_SYMBOL(restore_processor_state);