3ebad59056
Note: This patch didn'nt need an update since it's initial post. Some BIOSes may modify fixed-range MTRRs in SMM, e.g. when they transition the system into ACPI mode, which is entered thru an SMI, triggered by Linux in acpi_enable(). SMIs which cause that Linux is interrupted and BIOS code is executed (which may change e.g. fixed-range MTRRs) in SMM may be raised by an embedded system controller which is often found in notebooks also at other occasions. If we would not update our copy of the fixed-range MTRRs before suspending to RAM or to disk, restore_processor_state() would set the fixed-range MTRRs of the BSP using old backup values which may be outdated and this could cause the system to fail later during resume. This patch ensures that our copy of the fixed-range MTRRs is updated when saving the boot processor state on suspend to disk and suspend to RAM. In combination with other patches this allows to fix s2ram and s2disk on the Acer Ferrari 1000 notebook and at least s2disk on the Acer Ferrari 5000 notebook. Signed-off-by: Bernhard Kaindl <bk@suse.de> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andi Kleen <ak@suse.de> Cc: Dave Jones <davej@codemonkey.org.uk>
133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
/*
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* Suspend support specific for i386.
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*
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* Distribute under GPLv2
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*
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* Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
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* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
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*/
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#include <linux/module.h>
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#include <linux/suspend.h>
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#include <asm/mtrr.h>
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#include <asm/mce.h>
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static struct saved_context saved_context;
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unsigned long saved_context_ebx;
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unsigned long saved_context_esp, saved_context_ebp;
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unsigned long saved_context_esi, saved_context_edi;
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unsigned long saved_context_eflags;
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void __save_processor_state(struct saved_context *ctxt)
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{
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mtrr_save_fixed_ranges(NULL);
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kernel_fpu_begin();
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/*
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* descriptor tables
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*/
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store_gdt(&ctxt->gdt);
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store_idt(&ctxt->idt);
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store_tr(ctxt->tr);
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/*
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* segment registers
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*/
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savesegment(es, ctxt->es);
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savesegment(fs, ctxt->fs);
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savesegment(gs, ctxt->gs);
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savesegment(ss, ctxt->ss);
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/*
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* control registers
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*/
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ctxt->cr0 = read_cr0();
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ctxt->cr2 = read_cr2();
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ctxt->cr3 = read_cr3();
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ctxt->cr4 = read_cr4();
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}
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void save_processor_state(void)
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{
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__save_processor_state(&saved_context);
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}
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static void do_fpu_end(void)
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{
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/*
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* Restore FPU regs if necessary.
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*/
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kernel_fpu_end();
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}
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static void fix_processor_context(void)
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{
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int cpu = smp_processor_id();
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struct tss_struct * t = &per_cpu(init_tss, cpu);
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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. */
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load_TR_desc(); /* This does ltr */
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load_LDT(¤t->active_mm->context); /* This does lldt */
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/*
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* Now maybe reload the debug registers
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*/
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if (current->thread.debugreg[7]){
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set_debugreg(current->thread.debugreg[0], 0);
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set_debugreg(current->thread.debugreg[1], 1);
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set_debugreg(current->thread.debugreg[2], 2);
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set_debugreg(current->thread.debugreg[3], 3);
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/* no 4 and 5 */
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set_debugreg(current->thread.debugreg[6], 6);
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set_debugreg(current->thread.debugreg[7], 7);
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}
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}
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void __restore_processor_state(struct saved_context *ctxt)
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{
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/*
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* control registers
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*/
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write_cr4(ctxt->cr4);
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write_cr3(ctxt->cr3);
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write_cr2(ctxt->cr2);
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write_cr0(ctxt->cr0);
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/*
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* now restore the descriptor tables to their proper values
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* ltr is done i fix_processor_context().
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*/
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load_gdt(&ctxt->gdt);
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load_idt(&ctxt->idt);
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/*
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* segment registers
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*/
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loadsegment(es, ctxt->es);
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loadsegment(fs, ctxt->fs);
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loadsegment(gs, ctxt->gs);
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loadsegment(ss, ctxt->ss);
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/*
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* sysenter MSRs
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*/
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if (boot_cpu_has(X86_FEATURE_SEP))
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enable_sep_cpu();
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fix_processor_context();
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do_fpu_end();
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mtrr_ap_init();
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mcheck_init(&boot_cpu_data);
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}
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void restore_processor_state(void)
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{
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__restore_processor_state(&saved_context);
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}
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/* Needed by apm.c */
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EXPORT_SYMBOL(save_processor_state);
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EXPORT_SYMBOL(restore_processor_state);
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