63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2008, 2009
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*
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/memblock.h>
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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <asm/ipl.h>
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#include <asm/sclp.h>
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#include <asm/setup.h>
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#define CHUNK_READ_WRITE 0
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#define CHUNK_READ_ONLY 1
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static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size)
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{
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memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
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start, start + size - 1);
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memblock_add_range(&memblock.memory, start, size, 0, 0);
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memblock_add_range(&memblock.physmem, start, size, 0, 0);
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}
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void __init detect_memory_memblock(void)
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{
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unsigned long memsize, rnmax, rzm, addr, size;
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int type;
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rzm = sclp.rzm;
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rnmax = sclp.rnmax;
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memsize = rzm * rnmax;
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if (!rzm)
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rzm = 1UL << 17;
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max_physmem_end = memsize;
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addr = 0;
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/* keep memblock lists close to the kernel */
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memblock_set_bottom_up(true);
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do {
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size = 0;
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/* assume lowcore is writable */
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type = addr ? tprot(addr) : CHUNK_READ_WRITE;
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do {
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size += rzm;
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if (max_physmem_end && addr + size >= max_physmem_end)
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break;
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} while (type == tprot(addr + size));
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if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
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if (max_physmem_end && (addr + size > max_physmem_end))
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size = max_physmem_end - addr;
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memblock_physmem_add(addr, size);
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}
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addr += size;
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} while (addr < max_physmem_end);
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memblock_set_bottom_up(false);
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if (!max_physmem_end)
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max_physmem_end = memblock_end_of_DRAM();
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memblock_dump_all();
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}
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