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357d122670
The two use-cases where we needed to store the GDT were during ACPI S3 suspend and resume. As the patches: x86/gdt/i386: store/load GDT for ACPI S3 or hibernation/resume path is not needed x86/gdt/64-bit: store/load GDT for ACPI S3 or hibernate/resume path is not needed. have demonstrated - there are other mechanism by which the GDT is saved and reloaded during early resume path. Hence we do not need to worry about the pvops call-chain for saving the GDT and can and can eliminate it. The other areas where the store_gdt is used are never going to be hit when running under the pvops platforms. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Link: http://lkml.kernel.org/r/1365194544-14648-4-git-send-email-konrad.wilk@oracle.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/init_task.h>
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#include <linux/fs.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/desc.h>
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#define DOUBLEFAULT_STACKSIZE (1024)
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static unsigned long doublefault_stack[DOUBLEFAULT_STACKSIZE];
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#define STACK_START (unsigned long)(doublefault_stack+DOUBLEFAULT_STACKSIZE)
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#define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + MAXMEM)
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static void doublefault_fn(void)
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{
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struct desc_ptr gdt_desc = {0, 0};
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unsigned long gdt, tss;
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native_store_gdt(&gdt_desc);
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gdt = gdt_desc.address;
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printk(KERN_EMERG "PANIC: double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);
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if (ptr_ok(gdt)) {
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gdt += GDT_ENTRY_TSS << 3;
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tss = get_desc_base((struct desc_struct *)gdt);
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printk(KERN_EMERG "double fault, tss at %08lx\n", tss);
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if (ptr_ok(tss)) {
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struct x86_hw_tss *t = (struct x86_hw_tss *)tss;
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printk(KERN_EMERG "eip = %08lx, esp = %08lx\n",
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t->ip, t->sp);
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printk(KERN_EMERG "eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n",
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t->ax, t->bx, t->cx, t->dx);
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printk(KERN_EMERG "esi = %08lx, edi = %08lx\n",
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t->si, t->di);
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}
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}
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for (;;)
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cpu_relax();
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}
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struct tss_struct doublefault_tss __cacheline_aligned = {
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.x86_tss = {
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.sp0 = STACK_START,
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.ss0 = __KERNEL_DS,
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.ldt = 0,
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.io_bitmap_base = INVALID_IO_BITMAP_OFFSET,
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.ip = (unsigned long) doublefault_fn,
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/* 0x2 bit is always set */
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.flags = X86_EFLAGS_SF | 0x2,
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.sp = STACK_START,
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.es = __USER_DS,
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.cs = __KERNEL_CS,
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.ss = __KERNEL_DS,
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.ds = __USER_DS,
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.fs = __KERNEL_PERCPU,
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.__cr3 = __pa_nodebug(swapper_pg_dir),
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}
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};
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