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