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/* $Id: ip27-memory.c,v 1.2 2000/01/27 01:05:24 ralf Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2000 by Ralf Baechle
* Copyright (C) 2000 by Silicon Graphics, Inc.
*
* On SGI IP27 the ARC memory configuration data is completly bogus but
* alternate easier to use mechanisms are available.
*/
#include <linux/init.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <asm/page.h>
#include <asm/bootinfo.h>
#include <asm/addrspace.h>
#include <asm/sn/types.h>
#include <asm/sn/addrs.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/arch.h>
typedef unsigned long pfn_t; /* into <asm/sn/types.h> */
#define KDM_TO_PHYS(x) ((x) & TO_PHYS_MASK) /* into asm/addrspace.h */
#define SLOT_PFNSHIFT (SLOT_SHIFT - PAGE_SHIFT) /* into asm/sn/arch.h */
#define PFN_NASIDSHFT (NASID_SHFT - PAGE_SHIFT)
#define mkpfn(nasid, off) (((pfn_t)(nasid) << PFN_NASIDSHFT) | (off))
#define slot_getbasepfn(node,slot) \
(mkpfn(COMPACT_TO_NASID_NODEID(node), slot<<SLOT_PFNSHIFT))
extern nasid_t compact_to_nasid_node[];
extern char _end;
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
short slot_lastfilled_cache[MAX_COMPACT_NODES];
unsigned short slot_psize_cache[MAX_COMPACT_NODES][MAX_MEM_SLOTS];
/*
* Return pfn of first free page of memory on a node. PROM may allocate
* data structures on the first couple of pages of the first slot of each
* node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
*/
pfn_t node_getfirstfree(cnodeid_t cnode)
{
#ifdef LATER
nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
if (cnode == 0)
return KDM_TO_PHYS((unsigned long)(&_end));
return KDM_TO_PHYS(SYMMON_STK_ADDR(nasid, 0));
#endif
if (cnode == 0)
return (KDM_TO_PHYS(PFN_ALIGN(&_end) - (CKSEG0 - K0BASE))
>> PAGE_SHIFT);
return slot_getbasepfn(cnode, 0);
}
/*
* Return the number of pages of memory provided by the given slot
* on the specified node.
*/
pfn_t slot_getsize(cnodeid_t node, int slot)
{
return (pfn_t) slot_psize_cache[node][slot];
}
/*
* Return the pfn of the last free page of memory on a node.
*/
pfn_t node_getmaxclick(cnodeid_t node)
{
pfn_t slot_psize;
int slot;
/*
* Start at the top slot. When we find a slot with memory in it,
* that's the winner.
*/
for (slot = (node_getnumslots(node) - 1); slot >= 0; slot--) {
if ((slot_psize = slot_getsize(node, slot))) {
/* Return the basepfn + the slot size, minus 1. */
return slot_getbasepfn(node, slot) + slot_psize - 1;
}
}
/*
* If there's no memory on the node, return 0. This is likely
* to cause problems.
*/
return (pfn_t)0;
}
static pfn_t slot_psize_compute(cnodeid_t node, int slot)
{
nasid_t nasid;
lboard_t *brd;
klmembnk_t *banks;
unsigned long size;
nasid = COMPACT_TO_NASID_NODEID(node);
/* Find the node board */
brd = find_lboard_real((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
if (!brd)
return 0;
/* Get the memory bank structure */
banks = (klmembnk_t *)find_first_component(brd, KLSTRUCT_MEMBNK);
if (!banks)
return 0;
/* Size in _Megabytes_ */
size = (unsigned long)banks->membnk_bnksz[slot/4];
/* hack for 128 dimm banks */
if (size <= 128) {
if (slot%4 == 0) {
size <<= 20; /* size in bytes */
return(size >> PAGE_SHIFT);
} else {
return 0;
}
} else {
size /= 4;
size <<= 20;
return(size >> PAGE_SHIFT);
}
}
pfn_t szmem(pfn_t fpage, pfn_t maxpmem)
{
int node, slot;
int numslots;
pfn_t num_pages = 0;
pfn_t slot_psize;
for (node = 0; node < numnodes; node++) {
numslots = node_getnumslots(node);
for (slot = 0; slot < numslots; slot++) {
slot_psize = slot_psize_compute(node, slot);
num_pages += slot_psize;
slot_psize_cache[node][slot] =
(unsigned short) slot_psize;
if (slot_psize)
slot_lastfilled_cache[node] = slot;
}
}
if (maxpmem)
return((maxpmem > num_pages) ? num_pages : maxpmem);
else
return num_pages;
}
/*
* Currently, the intranode memory hole support assumes that each slot
* contains at least 32 MBytes of memory. We assume all bootmem data
* fits on the first slot.
*/
void __init prom_meminit(void)
{
extern void mlreset(void);
cnodeid_t node;
pfn_t slot_firstpfn, slot_lastpfn, slot_freepfn, numpages;
unsigned long bootmap_size;
mlreset();
numpages = szmem(0, 0);
for (node = (numnodes - 1); node >= 0; node--) {
slot_firstpfn = slot_getbasepfn(node, 0);
slot_lastpfn = slot_firstpfn + slot_getsize(node, 0);
slot_freepfn = node_getfirstfree(node);
max_low_pfn = (slot_lastpfn - slot_firstpfn);
bootmap_size = init_bootmem_node(node, slot_freepfn,
slot_firstpfn, slot_lastpfn);
free_bootmem_node(node, slot_firstpfn << PAGE_SHIFT,
(slot_lastpfn - slot_firstpfn) << PAGE_SHIFT);
reserve_bootmem_node(node, slot_firstpfn << PAGE_SHIFT,
((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size);
}
printk("Total memory probed : 0x%lx pages\n", numpages);
}
int __init page_is_ram(unsigned long pagenr)
{
return 1;
}
void __init
prom_free_prom_memory (void)
{
/* We got nothing to free here ... */
}
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