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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5a79859ae0
Remove the 31 bit support in order to reduce maintenance cost and
effectively remove dead code. Since a couple of years there is no
distribution left that comes with a 31 bit kernel.
The 31 bit kernel also has been broken since more than a year before
anybody noticed. In addition I added a removal warning to the kernel
shown at ipl for 5 minutes: a960062e58 ("s390: add 31 bit warning
message") which let everybody know about the plan to remove 31 bit
code. We didn't get any response.
Given that the last 31 bit only machine was introduced in 1999 let's
remove the code.
Anybody with 31 bit user space code can still use the compat mode.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
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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/module.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 ADDR2G (1ULL << 31)
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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_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 long memsize, rnmax, rzm;
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unsigned long addr, size;
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int type;
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rzm = sclp_get_rzm();
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rnmax = sclp_get_rnmax();
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memsize = rzm * rnmax;
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if (!rzm)
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rzm = 1ULL << 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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type = tprot(addr);
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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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}
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