1 #ifndef _ASM_POWERPC_KEXEC_H
2 #define _ASM_POWERPC_KEXEC_H
3 #ifdef __KERNEL__
4 
5 #if defined(CONFIG_FSL_BOOKE) || defined(CONFIG_44x)
6 
7 /*
8  * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
9  * and therefore we can only deal with memory within this range
10  */
11 #define KEXEC_SOURCE_MEMORY_LIMIT	(2 * 1024 * 1024 * 1024UL - 1)
12 #define KEXEC_DESTINATION_MEMORY_LIMIT	(2 * 1024 * 1024 * 1024UL - 1)
13 #define KEXEC_CONTROL_MEMORY_LIMIT	(2 * 1024 * 1024 * 1024UL - 1)
14 
15 #else
16 
17 /*
18  * Maximum page that is mapped directly into kernel memory.
19  * XXX: Since we copy virt we can use any page we allocate
20  */
21 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
22 
23 /*
24  * Maximum address we can reach in physical address mode.
25  * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
26  */
27 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
28 
29 /* Maximum address we can use for the control code buffer */
30 #ifdef __powerpc64__
31 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
32 #else
33 /* TASK_SIZE, probably left over from use_mm ?? */
34 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
35 #endif
36 #endif
37 
38 #define KEXEC_CONTROL_PAGE_SIZE 4096
39 
40 /* The native architecture */
41 #ifdef __powerpc64__
42 #define KEXEC_ARCH KEXEC_ARCH_PPC64
43 #else
44 #define KEXEC_ARCH KEXEC_ARCH_PPC
45 #endif
46 
47 #define KEXEC_STATE_NONE 0
48 #define KEXEC_STATE_IRQS_OFF 1
49 #define KEXEC_STATE_REAL_MODE 2
50 
51 #ifndef __ASSEMBLY__
52 #include <asm/reg.h>
53 
54 typedef void (*crash_shutdown_t)(void);
55 
56 #ifdef CONFIG_KEXEC
57 
58 /*
59  * This function is responsible for capturing register states if coming
60  * via panic or invoking dump using sysrq-trigger.
61  */
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)62 static inline void crash_setup_regs(struct pt_regs *newregs,
63 					struct pt_regs *oldregs)
64 {
65 	if (oldregs)
66 		memcpy(newregs, oldregs, sizeof(*newregs));
67 	else
68 		ppc_save_regs(newregs);
69 }
70 
71 extern void kexec_smp_wait(void);	/* get and clear naca physid, wait for
72 					  master to copy new code to 0 */
73 extern int crashing_cpu;
74 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
75 
76 struct kimage;
77 struct pt_regs;
78 extern void default_machine_kexec(struct kimage *image);
79 extern int default_machine_kexec_prepare(struct kimage *image);
80 extern void default_machine_crash_shutdown(struct pt_regs *regs);
81 extern int crash_shutdown_register(crash_shutdown_t handler);
82 extern int crash_shutdown_unregister(crash_shutdown_t handler);
83 
84 extern void machine_kexec_simple(struct kimage *image);
85 extern void crash_kexec_secondary(struct pt_regs *regs);
86 extern int overlaps_crashkernel(unsigned long start, unsigned long size);
87 extern void reserve_crashkernel(void);
88 extern void machine_kexec_mask_interrupts(void);
89 
90 #else /* !CONFIG_KEXEC */
crash_kexec_secondary(struct pt_regs * regs)91 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
92 
overlaps_crashkernel(unsigned long start,unsigned long size)93 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
94 {
95 	return 0;
96 }
97 
reserve_crashkernel(void)98 static inline void reserve_crashkernel(void) { ; }
99 
crash_shutdown_register(crash_shutdown_t handler)100 static inline int crash_shutdown_register(crash_shutdown_t handler)
101 {
102 	return 0;
103 }
104 
crash_shutdown_unregister(crash_shutdown_t handler)105 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
106 {
107 	return 0;
108 }
109 
110 #endif /* CONFIG_KEXEC */
111 #endif /* ! __ASSEMBLY__ */
112 #endif /* __KERNEL__ */
113 #endif /* _ASM_POWERPC_KEXEC_H */
114