diff options
Diffstat (limited to 'arch/s390/include/asm/mem_detect.h')
-rw-r--r-- | arch/s390/include/asm/mem_detect.h | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/arch/s390/include/asm/mem_detect.h b/arch/s390/include/asm/mem_detect.h deleted file mode 100644 index f9e7354036d2..000000000000 --- a/arch/s390/include/asm/mem_detect.h +++ /dev/null @@ -1,117 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _ASM_S390_MEM_DETECT_H -#define _ASM_S390_MEM_DETECT_H - -#include <linux/types.h> - -enum mem_info_source { - MEM_DETECT_NONE = 0, - MEM_DETECT_SCLP_STOR_INFO, - MEM_DETECT_DIAG260, - MEM_DETECT_SCLP_READ_INFO, - MEM_DETECT_BIN_SEARCH -}; - -struct mem_detect_block { - u64 start; - u64 end; -}; - -/* - * 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 mem_detect_blocks are embedded in mem_detect_info. - * If more mem_detect_blocks are required, a block of memory from already - * known mem_detect_block is taken (entries_extended points to it). - */ -#define MEM_INLINED_ENTRIES 255 /* (PAGE_SIZE - 16) / 16 */ - -struct mem_detect_info { - u32 count; - u8 info_source; - unsigned long usable; - struct mem_detect_block entries[MEM_INLINED_ENTRIES]; - struct mem_detect_block *entries_extended; -}; -extern struct mem_detect_info mem_detect; - -void add_mem_detect_block(u64 start, u64 end); - -static inline int __get_mem_detect_block(u32 n, unsigned long *start, - unsigned long *end, bool respect_usable_limit) -{ - if (n >= mem_detect.count) { - *start = 0; - *end = 0; - return -1; - } - - if (n < MEM_INLINED_ENTRIES) { - *start = (unsigned long)mem_detect.entries[n].start; - *end = (unsigned long)mem_detect.entries[n].end; - } else { - *start = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].start; - *end = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].end; - } - - if (respect_usable_limit && mem_detect.usable) { - if (*start >= mem_detect.usable) - return -1; - if (*end > mem_detect.usable) - *end = mem_detect.usable; - } - return 0; -} - -/** - * for_each_mem_detect_usable_block - 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_mem_detect_usable_block(i, p_start, p_end) \ - for (i = 0; !__get_mem_detect_block(i, p_start, p_end, true); i++) - -/* Walks over all detected online memory ranges disregarding usable limit. */ -#define for_each_mem_detect_block(i, p_start, p_end) \ - for (i = 0; !__get_mem_detect_block(i, p_start, p_end, false); i++) - -static inline unsigned long get_mem_detect_usable_total(void) -{ - unsigned long start, end, total = 0; - int i; - - for_each_mem_detect_usable_block(i, &start, &end) - total += end - start; - - return total; -} - -static inline void get_mem_detect_reserved(unsigned long *start, - unsigned long *size) -{ - *start = (unsigned long)mem_detect.entries_extended; - if (mem_detect.count > MEM_INLINED_ENTRIES) - *size = (mem_detect.count - MEM_INLINED_ENTRIES) * sizeof(struct mem_detect_block); - else - *size = 0; -} - -static inline unsigned long get_mem_detect_end(void) -{ - unsigned long start; - unsigned long end; - - if (mem_detect.usable) - return mem_detect.usable; - if (mem_detect.count) { - __get_mem_detect_block(mem_detect.count - 1, &start, &end, false); - return end; - } - return 0; -} - -#endif |