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/******************************************************************************
* machine_kexec.c
*
* Xen port written by:
* - Simon 'Horms' Horman <horms@verge.net.au>
* - Magnus Damm <magnus@valinux.co.jp>
*/
#include <xen/types.h>
#include <xen/kexec.h>
#include <xen/guest_access.h>
#include <asm/fixmap.h>
#include <asm/hpet.h>
typedef void (*relocate_new_kernel_t)(
unsigned long indirection_page,
unsigned long *page_list,
unsigned long start_address,
unsigned int preserve_context);
int machine_kexec_load(int type, int slot, xen_kexec_image_t *image)
{
unsigned long prev_ma = 0;
int fix_base = FIX_KEXEC_BASE_0 + (slot * (KEXEC_XEN_NO_PAGES >> 1));
int k;
/* setup fixmap to point to our pages and record the virtual address
* in every odd index in page_list[].
*/
for ( k = 0; k < KEXEC_XEN_NO_PAGES; k++ )
{
if ( (k & 1) == 0 )
{
/* Even pages: machine address. */
prev_ma = image->page_list[k];
}
else
{
/* Odd pages: va for previous ma. */
if ( is_pv_32on64_domain(dom0) )
{
/*
* The compatability bounce code sets up a page table
* with a 1-1 mapping of the first 1G of memory so
* VA==PA here.
*
* This Linux purgatory code still sets up separate
* high and low mappings on the control page (entries
* 0 and 1) but it is harmless if they are equal since
* that PT is not live at the time.
*/
image->page_list[k] = prev_ma;
}
else
{
set_fixmap(fix_base + (k >> 1), prev_ma);
image->page_list[k] = fix_to_virt(fix_base + (k >> 1));
}
}
}
return 0;
}
void machine_kexec_unload(int type, int slot, xen_kexec_image_t *image)
{
}
void machine_reboot_kexec(xen_kexec_image_t *image)
{
BUG_ON(smp_processor_id() != 0);
smp_send_stop();
machine_kexec(image);
BUG();
}
void machine_kexec(xen_kexec_image_t *image)
{
struct desc_ptr gdt_desc = {
.base = (unsigned long)(boot_cpu_gdt_table - FIRST_RESERVED_GDT_ENTRY),
.limit = LAST_RESERVED_GDT_BYTE
};
int i;
/* We are about to permenantly jump out of the Xen context into the kexec
* purgatory code. We really dont want to be still servicing interupts.
*/
local_irq_disable();
/* Now regular interrupts are disabled, we need to reduce the impact
* of interrupts not disabled by 'cli'.
*
* The NMI handlers have already been set up nmi_shootdown_cpus(). All
* pcpus other than us have the nmi_crash handler, while we have the nop
* handler.
*
* The MCE handlers touch extensive areas of Xen code and data. At this
* point, there is nothing we can usefully do, so set the nop handler.
*/
for ( i = 0; i < nr_cpu_ids; i++ )
{
if ( idt_tables[i] == NULL )
continue;
_update_gate_addr_lower(&idt_tables[i][TRAP_machine_check], &trap_nop);
}
/* Explicitly enable NMIs on this CPU. Some crashdump kernels do
* not like running with NMIs disabled. */
enable_nmis();
/*
* compat_machine_kexec() returns to idle pagetables, which requires us
* to be running on a static GDT mapping (idle pagetables have no GDT
* mappings in their per-domain mapping area).
*/
asm volatile ( "lgdt %0" : : "m" (gdt_desc) );
if ( is_pv_32on64_domain(dom0) )
{
compat_machine_kexec(image->page_list[1],
image->indirection_page,
image->page_list,
image->start_address);
}
else
{
relocate_new_kernel_t rnk;
rnk = (relocate_new_kernel_t) image->page_list[1];
(*rnk)(image->indirection_page, image->page_list,
image->start_address,
0 /* preserve_context */);
}
}
int machine_kexec_get(xen_kexec_range_t *range)
{
if (range->range != KEXEC_RANGE_MA_XEN)
return -EINVAL;
return machine_kexec_get_xen(range);
}
void arch_crash_save_vmcoreinfo(void)
{
VMCOREINFO_SYMBOL(dom_xen);
VMCOREINFO_SYMBOL(dom_io);
VMCOREINFO_SYMBOL_ALIAS(pgd_l4, idle_pg_table);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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