LXR linux/arch/s390/mm/mem

   1/*
   2 * Copyright IBM Corp. 2008, 2009
   3 *
   4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
   5 */
   6
   7#include <linux/kernel.h>
   8#include <linux/module.h>
   9#include <linux/memblock.h>
  10#include <linux/init.h>
  11#include <linux/debugfs.h>
  12#include <linux/seq_file.h>
  13#include <asm/ipl.h>
  14#include <asm/sclp.h>
  15#include <asm/setup.h>
  16
  17#define CHUNK_READ_WRITE 0
  18#define CHUNK_READ_ONLY  1
  19
  20static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size)
  21{
  22        memblock_add_range(&memblock.memory, start, size, 0, 0);
  23        memblock_add_range(&memblock.physmem, start, size, 0, 0);
  24}
  25
  26void __init detect_memory_memblock(void)
  27{
  28        unsigned long memsize, rnmax, rzm, addr, size;
  29        int type;
  30
  31        rzm = sclp.rzm;
  32        rnmax = sclp.rnmax;
  33        memsize = rzm * rnmax;
  34        if (!rzm)
  35                rzm = 1UL << 17;
  36        max_physmem_end = memsize;
  37        addr = 0;
  38        /* keep memblock lists close to the kernel */
  39        memblock_set_bottom_up(true);
  40        do {
  41                size = 0;
  42                type = tprot(addr);
  43                do {
  44                        size += rzm;
  45                        if (max_physmem_end && addr + size >= max_physmem_end)
  46                                break;
  47                } while (type == tprot(addr + size));
  48                if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
  49                        if (max_physmem_end && (addr + size > max_physmem_end))
  50                                size = max_physmem_end - addr;
  51                        memblock_physmem_add(addr, size);
  52                }
  53                addr += size;
  54        } while (addr < max_physmem_end);
  55        memblock_set_bottom_up(false);
  56        if (!max_physmem_end)
  57                max_physmem_end = memblock_end_of_DRAM();
  58}
  59