1 /*
2 * Copyright IBM Corp. 2005
3 *
4 * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
5 *
6 */
7
8 #ifndef _S390_KEXEC_H
9 #define _S390_KEXEC_H
10
11 #include <asm/processor.h>
12 #include <asm/page.h>
13 /*
14 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
15 * I.e. Maximum page that is mapped directly into kernel memory,
16 * and kmap is not required.
17 */
18
19 /* Maximum physical address we can use pages from */
20 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
21
22 /* Maximum address we can reach in physical address mode */
23 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
24
25 /* Maximum address we can use for the control pages */
26 /* Not more than 2GB */
27 #define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
28
29 /* Allocate control page with GFP_DMA */
30 #define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
31
32 /* Maximum address we can use for the crash control pages */
33 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
34
35 /* Allocate one page for the pdp and the second for the code */
36 #define KEXEC_CONTROL_PAGE_SIZE 4096
37
38 /* Alignment of crashkernel memory */
39 #define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
40
41 /* The native architecture */
42 #define KEXEC_ARCH KEXEC_ARCH_S390
43
44 /*
45 * Size for s390x ELF notes per CPU
46 *
47 * Seven notes plus zero note at the end: prstatus, fpregset, timer,
48 * tod_cmp, tod_reg, control regs, and prefix
49 */
50 #define KEXEC_NOTE_BYTES \
51 (ALIGN(sizeof(struct elf_note), 4) * 8 + \
52 ALIGN(sizeof("CORE"), 4) * 7 + \
53 ALIGN(sizeof(struct elf_prstatus), 4) + \
54 ALIGN(sizeof(elf_fpregset_t), 4) + \
55 ALIGN(sizeof(u64), 4) + \
56 ALIGN(sizeof(u64), 4) + \
57 ALIGN(sizeof(u32), 4) + \
58 ALIGN(sizeof(u64) * 16, 4) + \
59 ALIGN(sizeof(u32), 4) \
60 )
61
62 /* Provide a dummy definition to avoid build failures. */
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)63 static inline void crash_setup_regs(struct pt_regs *newregs,
64 struct pt_regs *oldregs) { }
65
66 #endif /*_S390_KEXEC_H */
67