ia64/linux-2.6.18-xen.hg

view include/asm-i386/kexec.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents a533be77c572
children
line source
1 #ifndef _I386_KEXEC_H
2 #define _I386_KEXEC_H
4 #define PA_CONTROL_PAGE 0
5 #define VA_CONTROL_PAGE 1
6 #define PA_PGD 2
7 #define VA_PGD 3
8 #define PA_PTE_0 4
9 #define VA_PTE_0 5
10 #define PA_PTE_1 6
11 #define VA_PTE_1 7
12 #ifdef CONFIG_X86_PAE
13 #define PA_PMD_0 8
14 #define VA_PMD_0 9
15 #define PA_PMD_1 10
16 #define VA_PMD_1 11
17 #define PAGES_NR 12
18 #else
19 #define PAGES_NR 8
20 #endif
22 #ifndef __ASSEMBLY__
24 #include <asm/fixmap.h>
25 #include <asm/ptrace.h>
26 #include <asm/string.h>
28 /*
29 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
30 * I.e. Maximum page that is mapped directly into kernel memory,
31 * and kmap is not required.
32 *
33 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
34 * calculation for the amount of memory directly mappable into the
35 * kernel memory space.
36 */
38 /* Maximum physical address we can use pages from */
39 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
40 /* Maximum address we can reach in physical address mode */
41 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
42 /* Maximum address we can use for the control code buffer */
43 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
45 #define KEXEC_CONTROL_CODE_SIZE 4096
47 /* The native architecture */
48 #define KEXEC_ARCH KEXEC_ARCH_386
50 /* We can also handle crash dumps from 64 bit kernel. */
51 #define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
53 #define MAX_NOTE_BYTES 1024
55 /* CPU does not save ss and esp on stack if execution is already
56 * running in kernel mode at the time of NMI occurrence. This code
57 * fixes it.
58 */
59 static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
60 struct pt_regs *oldregs)
61 {
62 memcpy(newregs, oldregs, sizeof(*newregs));
63 newregs->esp = (unsigned long)&(oldregs->esp);
64 __asm__ __volatile__(
65 "xorl %%eax, %%eax\n\t"
66 "movw %%ss, %%ax\n\t"
67 :"=a"(newregs->xss));
68 }
70 /*
71 * This function is responsible for capturing register states if coming
72 * via panic otherwise just fix up the ss and esp if coming via kernel
73 * mode exception.
74 */
75 static inline void crash_setup_regs(struct pt_regs *newregs,
76 struct pt_regs *oldregs)
77 {
78 if (oldregs)
79 crash_fixup_ss_esp(newregs, oldregs);
80 else {
81 __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx));
82 __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx));
83 __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx));
84 __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi));
85 __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi));
86 __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp));
87 __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax));
88 __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp));
89 __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss));
90 __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs));
91 __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds));
92 __asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes));
93 __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags));
95 newregs->eip = (unsigned long)current_text_addr();
96 }
97 }
98 asmlinkage NORET_TYPE void
99 relocate_kernel(unsigned long indirection_page,
100 unsigned long control_page,
101 unsigned long start_address,
102 unsigned int has_pae) ATTRIB_NORET;
105 /* Under Xen we need to work with machine addresses. These macros give the
106 * machine address of a certain page to the generic kexec code instead of
107 * the pseudo physical address which would be given by the default macros.
108 */
110 #ifdef CONFIG_XEN
111 #define KEXEC_ARCH_HAS_PAGE_MACROS
112 #define kexec_page_to_pfn(page) pfn_to_mfn(page_to_pfn(page))
113 #define kexec_pfn_to_page(pfn) pfn_to_page(mfn_to_pfn(pfn))
114 #define kexec_virt_to_phys(addr) virt_to_machine(addr)
115 #define kexec_phys_to_virt(addr) phys_to_virt(machine_to_phys(addr))
116 #endif
118 #endif /* __ASSEMBLY__ */
120 #endif /* _I386_KEXEC_H */