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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/x86_64/kernel/suspend.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/x86_64/kernel/suspend.c')
-rw-r--r--arch/x86_64/kernel/suspend.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c
new file mode 100644
index 00000000000..ebaa1e37d65
--- /dev/null
+++ b/arch/x86_64/kernel/suspend.c
@@ -0,0 +1,157 @@
+/*
+ * 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/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <linux/sysrq.h>
+#include <linux/proc_fs.h>
+#include <linux/irq.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/suspend.h>
+#include <asm/uaccess.h>
+#include <asm/acpi.h>
+#include <asm/tlbflush.h>
+#include <asm/io.h>
+#include <asm/proto.h>
+
+struct saved_context saved_context;
+
+unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx;
+unsigned long saved_context_esp, saved_context_ebp, saved_context_esi, saved_context_edi;
+unsigned long saved_context_r08, saved_context_r09, saved_context_r10, saved_context_r11;
+unsigned long saved_context_r12, saved_context_r13, saved_context_r14, saved_context_r15;
+unsigned long saved_context_eflags;
+
+void __save_processor_state(struct saved_context *ctxt)
+{
+ kernel_fpu_begin();
+
+ /*
+ * descriptor tables
+ */
+ asm volatile ("sgdt %0" : "=m" (ctxt->gdt_limit));
+ asm volatile ("sidt %0" : "=m" (ctxt->idt_limit));
+ asm volatile ("sldt %0" : "=m" (ctxt->ldt));
+ asm volatile ("str %0" : "=m" (ctxt->tr));
+
+ /* XMM0..XMM15 should be handled by kernel_fpu_begin(). */
+ /* EFER should be constant for kernel version, no need to handle it. */
+ /*
+ * segment registers
+ */
+ asm volatile ("movw %%ds, %0" : "=m" (ctxt->ds));
+ asm volatile ("movw %%es, %0" : "=m" (ctxt->es));
+ asm volatile ("movw %%fs, %0" : "=m" (ctxt->fs));
+ asm volatile ("movw %%gs, %0" : "=m" (ctxt->gs));
+ asm volatile ("movw %%ss, %0" : "=m" (ctxt->ss));
+
+ rdmsrl(MSR_FS_BASE, ctxt->fs_base);
+ rdmsrl(MSR_GS_BASE, ctxt->gs_base);
+ rdmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base);
+
+ /*
+ * control registers
+ */
+ asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0));
+ asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2));
+ asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3));
+ asm volatile ("movq %%cr4, %0" : "=r" (ctxt->cr4));
+}
+
+void save_processor_state(void)
+{
+ __save_processor_state(&saved_context);
+}
+
+static void
+do_fpu_end(void)
+{
+ /* restore FPU regs if necessary */
+ /* Do it out of line so that gcc does not move cr0 load to some stupid place */
+ kernel_fpu_end();
+ mxcsr_feature_mask_init();
+}
+
+void __restore_processor_state(struct saved_context *ctxt)
+{
+ /*
+ * control registers
+ */
+ asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4));
+ asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3));
+ asm volatile ("movq %0, %%cr2" :: "r" (ctxt->cr2));
+ asm volatile ("movq %0, %%cr0" :: "r" (ctxt->cr0));
+
+ /*
+ * segment registers
+ */
+ asm volatile ("movw %0, %%ds" :: "r" (ctxt->ds));
+ asm volatile ("movw %0, %%es" :: "r" (ctxt->es));
+ asm volatile ("movw %0, %%fs" :: "r" (ctxt->fs));
+ load_gs_index(ctxt->gs);
+ asm volatile ("movw %0, %%ss" :: "r" (ctxt->ss));
+
+ wrmsrl(MSR_FS_BASE, ctxt->fs_base);
+ wrmsrl(MSR_GS_BASE, ctxt->gs_base);
+ wrmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base);
+
+ /*
+ * now restore the descriptor tables to their proper values
+ * ltr is done i fix_processor_context().
+ */
+ asm volatile ("lgdt %0" :: "m" (ctxt->gdt_limit));
+ asm volatile ("lidt %0" :: "m" (ctxt->idt_limit));
+ asm volatile ("lldt %0" :: "m" (ctxt->ldt));
+
+ fix_processor_context();
+
+ do_fpu_end();
+}
+
+void restore_processor_state(void)
+{
+ __restore_processor_state(&saved_context);
+}
+
+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 neccessary. But... This is neccessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
+
+ cpu_gdt_table[cpu][GDT_ENTRY_TSS].type = 9;
+
+ syscall_init(); /* This sets MSR_*STAR and related */
+ load_TR_desc(); /* This does ltr */
+ load_LDT(&current->active_mm->context); /* This does lldt */
+
+ /*
+ * Now maybe reload the debug registers
+ */
+ if (current->thread.debugreg7){
+ loaddebug(&current->thread, 0);
+ loaddebug(&current->thread, 1);
+ loaddebug(&current->thread, 2);
+ loaddebug(&current->thread, 3);
+ /* no 4 and 5 */
+ loaddebug(&current->thread, 6);
+ loaddebug(&current->thread, 7);
+ }
+
+}
+
+