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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_MEM_DETECT_H
#define _ASM_S390_MEM_DETECT_H
#include <linux/types.h>
#include <asm/page.h>
enum physmem_info_source {
MEM_DETECT_NONE = 0,
MEM_DETECT_SCLP_STOR_INFO,
MEM_DETECT_DIAG260,
MEM_DETECT_SCLP_READ_INFO,
MEM_DETECT_BIN_SEARCH
};
struct physmem_range {
u64 start;
u64 end;
};
enum reserved_range_type {
RR_DECOMPRESSOR,
RR_INITRD,
RR_VMLINUX,
RR_AMODE31,
RR_IPLREPORT,
RR_CERT_COMP_LIST,
RR_MEM_DETECT_EXTENDED,
RR_VMEM,
RR_MAX
};
struct reserved_range {
unsigned long start;
unsigned long end;
struct reserved_range *chain;
};
/*
* Storage element id is defined as 1 byte (up to 256 storage elements).
* In practise only storage element id 0 and 1 are used).
* According to architecture one storage element could have as much as
* 1020 subincrements. 255 physmem_ranges are embedded in physmem_info.
* If more physmem_ranges are required, a block of memory from already
* known physmem_range is taken (online_extended points to it).
*/
#define MEM_INLINED_ENTRIES 255 /* (PAGE_SIZE - 16) / 16 */
struct physmem_info {
u32 range_count;
u8 info_source;
unsigned long usable;
struct reserved_range reserved[RR_MAX];
struct physmem_range online[MEM_INLINED_ENTRIES];
struct physmem_range *online_extended;
};
extern struct physmem_info physmem_info;
void add_physmem_online_range(u64 start, u64 end);
static inline int __get_physmem_range(u32 n, unsigned long *start,
unsigned long *end, bool respect_usable_limit)
{
if (n >= physmem_info.range_count) {
*start = 0;
*end = 0;
return -1;
}
if (n < MEM_INLINED_ENTRIES) {
*start = (unsigned long)physmem_info.online[n].start;
*end = (unsigned long)physmem_info.online[n].end;
} else {
*start = (unsigned long)physmem_info.online_extended[n - MEM_INLINED_ENTRIES].start;
*end = (unsigned long)physmem_info.online_extended[n - MEM_INLINED_ENTRIES].end;
}
if (respect_usable_limit && physmem_info.usable) {
if (*start >= physmem_info.usable)
return -1;
if (*end > physmem_info.usable)
*end = physmem_info.usable;
}
return 0;
}
/**
* for_each_physmem_usable_range - early online memory range iterator
* @i: an integer used as loop variable
* @p_start: ptr to unsigned long for start address of the range
* @p_end: ptr to unsigned long for end address of the range
*
* Walks over detected online memory ranges below usable limit.
*/
#define for_each_physmem_usable_range(i, p_start, p_end) \
for (i = 0; !__get_physmem_range(i, p_start, p_end, true); i++)
/* Walks over all detected online memory ranges disregarding usable limit. */
#define for_each_physmem_online_range(i, p_start, p_end) \
for (i = 0; !__get_physmem_range(i, p_start, p_end, false); i++)
static inline const char *get_physmem_info_source(void)
{
switch (physmem_info.info_source) {
case MEM_DETECT_SCLP_STOR_INFO:
return "sclp storage info";
case MEM_DETECT_DIAG260:
return "diag260";
case MEM_DETECT_SCLP_READ_INFO:
return "sclp read info";
case MEM_DETECT_BIN_SEARCH:
return "binary search";
}
return "none";
}
#define RR_TYPE_NAME(t) case RR_ ## t: return #t
static inline const char *get_rr_type_name(enum reserved_range_type t)
{
switch (t) {
RR_TYPE_NAME(DECOMPRESSOR);
RR_TYPE_NAME(INITRD);
RR_TYPE_NAME(VMLINUX);
RR_TYPE_NAME(AMODE31);
RR_TYPE_NAME(IPLREPORT);
RR_TYPE_NAME(CERT_COMP_LIST);
RR_TYPE_NAME(MEM_DETECT_EXTENDED);
RR_TYPE_NAME(VMEM);
default:
return "UNKNOWN";
}
}
#define for_each_physmem_reserved_type_range(t, range, p_start, p_end) \
for (range = &physmem_info.reserved[t], *p_start = range->start, *p_end = range->end; \
range && range->end; range = range->chain ? __va(range->chain) : NULL, \
*p_start = range ? range->start : 0, *p_end = range ? range->end : 0)
static inline struct reserved_range *__physmem_reserved_next(enum reserved_range_type *t,
struct reserved_range *range)
{
if (!range) {
range = &physmem_info.reserved[*t];
if (range->end)
return range;
}
if (range->chain)
return __va(range->chain);
while (++*t < RR_MAX) {
range = &physmem_info.reserved[*t];
if (range->end)
return range;
}
return NULL;
}
#define for_each_physmem_reserved_range(t, range, p_start, p_end) \
for (t = 0, range = __physmem_reserved_next(&t, NULL), \
*p_start = range ? range->start : 0, *p_end = range ? range->end : 0; \
range; range = __physmem_reserved_next(&t, range), \
*p_start = range ? range->start : 0, *p_end = range ? range->end : 0)
static inline unsigned long get_physmem_reserved(enum reserved_range_type type,
unsigned long *addr, unsigned long *size)
{
*addr = physmem_info.reserved[type].start;
*size = physmem_info.reserved[type].end - physmem_info.reserved[type].start;
return *size;
}
#endif
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