xref: /openbmc/linux/arch/s390/include/asm/kexec.h (revision 6aa7de05)
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 /* Provide a dummy definition to avoid build failures. */
45 static inline void crash_setup_regs(struct pt_regs *newregs,
46 					struct pt_regs *oldregs) { }
47 
48 #endif /*_S390_KEXEC_H */
49