1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_S390_MEM_DETECT_H
3 #define _ASM_S390_MEM_DETECT_H
5 #include <linux/types.h>
8 enum physmem_info_source {
10 MEM_DETECT_SCLP_STOR_INFO,
12 MEM_DETECT_SCLP_READ_INFO,
16 struct physmem_range {
21 enum reserved_range_type {
29 RR_MEM_DETECT_EXTENDED,
34 struct reserved_range {
37 struct reserved_range *chain;
41 * Storage element id is defined as 1 byte (up to 256 storage elements).
42 * In practise only storage element id 0 and 1 are used).
43 * According to architecture one storage element could have as much as
44 * 1020 subincrements. 255 physmem_ranges are embedded in physmem_info.
45 * If more physmem_ranges are required, a block of memory from already
46 * known physmem_range is taken (online_extended points to it).
48 #define MEM_INLINED_ENTRIES 255 /* (PAGE_SIZE - 16) / 16 */
54 struct reserved_range reserved[RR_MAX];
55 struct physmem_range online[MEM_INLINED_ENTRIES];
56 struct physmem_range *online_extended;
59 extern struct physmem_info physmem_info;
61 void add_physmem_online_range(u64 start, u64 end);
63 static inline int __get_physmem_range(u32 n, unsigned long *start,
64 unsigned long *end, bool respect_usable_limit)
66 if (n >= physmem_info.range_count) {
72 if (n < MEM_INLINED_ENTRIES) {
73 *start = (unsigned long)physmem_info.online[n].start;
74 *end = (unsigned long)physmem_info.online[n].end;
76 *start = (unsigned long)physmem_info.online_extended[n - MEM_INLINED_ENTRIES].start;
77 *end = (unsigned long)physmem_info.online_extended[n - MEM_INLINED_ENTRIES].end;
80 if (respect_usable_limit && physmem_info.usable) {
81 if (*start >= physmem_info.usable)
83 if (*end > physmem_info.usable)
84 *end = physmem_info.usable;
90 * for_each_physmem_usable_range - early online memory range iterator
91 * @i: an integer used as loop variable
92 * @p_start: ptr to unsigned long for start address of the range
93 * @p_end: ptr to unsigned long for end address of the range
95 * Walks over detected online memory ranges below usable limit.
97 #define for_each_physmem_usable_range(i, p_start, p_end) \
98 for (i = 0; !__get_physmem_range(i, p_start, p_end, true); i++)
100 /* Walks over all detected online memory ranges disregarding usable limit. */
101 #define for_each_physmem_online_range(i, p_start, p_end) \
102 for (i = 0; !__get_physmem_range(i, p_start, p_end, false); i++)
104 static inline const char *get_physmem_info_source(void)
106 switch (physmem_info.info_source) {
107 case MEM_DETECT_SCLP_STOR_INFO:
108 return "sclp storage info";
109 case MEM_DETECT_DIAG260:
111 case MEM_DETECT_SCLP_READ_INFO:
112 return "sclp read info";
113 case MEM_DETECT_BIN_SEARCH:
114 return "binary search";
119 #define RR_TYPE_NAME(t) case RR_ ## t: return #t
120 static inline const char *get_rr_type_name(enum reserved_range_type t)
123 RR_TYPE_NAME(DECOMPRESSOR);
124 RR_TYPE_NAME(INITRD);
125 RR_TYPE_NAME(VMLINUX);
126 RR_TYPE_NAME(AMODE31);
127 RR_TYPE_NAME(IPLREPORT);
128 RR_TYPE_NAME(CERT_COMP_LIST);
129 RR_TYPE_NAME(MEM_DETECT_EXTENDED);
136 #define for_each_physmem_reserved_type_range(t, range, p_start, p_end) \
137 for (range = &physmem_info.reserved[t], *p_start = range->start, *p_end = range->end; \
138 range && range->end; range = range->chain ? __va(range->chain) : NULL, \
139 *p_start = range ? range->start : 0, *p_end = range ? range->end : 0)
141 static inline struct reserved_range *__physmem_reserved_next(enum reserved_range_type *t,
142 struct reserved_range *range)
145 range = &physmem_info.reserved[*t];
150 return __va(range->chain);
151 while (++*t < RR_MAX) {
152 range = &physmem_info.reserved[*t];
159 #define for_each_physmem_reserved_range(t, range, p_start, p_end) \
160 for (t = 0, range = __physmem_reserved_next(&t, NULL), \
161 *p_start = range ? range->start : 0, *p_end = range ? range->end : 0; \
162 range; range = __physmem_reserved_next(&t, range), \
163 *p_start = range ? range->start : 0, *p_end = range ? range->end : 0)
165 static inline unsigned long get_physmem_reserved(enum reserved_range_type type,
166 unsigned long *addr, unsigned long *size)
168 *addr = physmem_info.reserved[type].start;
169 *size = physmem_info.reserved[type].end - physmem_info.reserved[type].start;