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/*
* memory.c: PROM library functions for acquiring/using memory descriptors
* given to us from the ARCS firmware.
*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
*
* $Id: memory.c,v 1.10 2000/01/27 23:21:57 ralf Exp $
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/swap.h>
#include <asm/sgialib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#undef DEBUG
struct linux_mdesc * __init
ArcGetMemoryDescriptor(struct linux_mdesc *Current)
{
return romvec->get_mdesc(Current);
}
#ifdef DEBUG /* convenient for debugging */
static char *arcs_mtypes[8] = {
"Exception Block",
"ARCS Romvec Page",
"Free/Contig RAM",
"Generic Free RAM",
"Bad Memory",
"Standlong Program Pages",
"ARCS Temp Storage Area",
"ARCS Permanent Storage Area"
};
static char *arc_mtypes[8] = {
"Exception Block",
"SystemParameterBlock",
"FreeMemory",
"Bad Memory",
"LoadedProgram",
"FirmwareTemporary",
"FirmwarePermanent",
"FreeContigiuous"
};
#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] : arc_mtypes[a.arc]
#endif
static struct prom_pmemblock pblocks[PROM_MAX_PMEMBLOCKS];
#define MEMTYPE_DONTUSE 0
#define MEMTYPE_PROM 1
#define MEMTYPE_FREE 2
static inline int memtype_classify_arcs (union linux_memtypes type)
{
switch (type.arcs) {
case arcs_fcontig:
case arcs_free:
return MEMTYPE_FREE;
case arcs_atmp:
return MEMTYPE_PROM;
case arcs_eblock:
case arcs_rvpage:
case arcs_bmem:
case arcs_prog:
case arcs_aperm:
return MEMTYPE_DONTUSE;
default:
BUG();
}
while(1); /* Nuke warning. */
}
static inline int memtype_classify_arc (union linux_memtypes type)
{
switch (type.arc) {
case arc_free:
case arc_fcontig:
return MEMTYPE_FREE;
case arc_atmp:
return MEMTYPE_PROM;
case arc_eblock:
case arc_rvpage:
case arc_bmem:
case arc_prog:
case arc_aperm:
return MEMTYPE_DONTUSE;
default:
BUG();
}
while(1); /* Nuke warning. */
}
static int __init prom_memtype_classify (union linux_memtypes type)
{
if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
return memtype_classify_arcs(type);
return memtype_classify_arc(type);
}
static inline unsigned long find_max_low_pfn(void)
{
struct prom_pmemblock *p, *highest;
unsigned long pfn;
p = pblocks;
highest = 0;
while (p->size != 0) {
if (!highest || p->base > highest->base)
highest = p;
p++;
}
pfn = (highest->base + highest->size) >> PAGE_SHIFT;
#ifdef DEBUG
prom_printf("find_max_low_pfn: 0x%lx pfns.\n", pfn);
#endif
return pfn;
}
static inline struct prom_pmemblock *find_largest_memblock(void)
{
struct prom_pmemblock *p, *largest;
p = pblocks;
largest = 0;
while (p->size != 0) {
if (!largest || p->size > largest->size)
largest = p;
p++;
}
return largest;
}
void __init prom_meminit(void)
{
struct prom_pmemblock *largest;
unsigned long bootmap_size, kbegin, kend;
struct linux_mdesc *p;
int totram;
int i = 0;
#ifdef DEBUG
prom_printf("ARCS MEMORY DESCRIPTOR dump:\n");
p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
while(p) {
prom_printf("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
i, p, p->base, p->pages, mtypes(p->type));
p = ArcGetMemoryDescriptor(p);
i++;
}
#endif
totram = 0;
i = 0;
p = PROM_NULL_MDESC;
while ((p = ArcGetMemoryDescriptor(p))) {
pblocks[i].type = prom_memtype_classify(p->type);
pblocks[i].base = p->base << PAGE_SHIFT;
pblocks[i].size = p->pages << PAGE_SHIFT;
switch (pblocks[i].type) {
case MEMTYPE_FREE:
totram += pblocks[i].size;
#ifdef DEBUG
prom_printf("free_chunk[%d]: base=%08lx size=%x\n",
i, pblocks[i].base,
pblocks[i].size);
#endif
i++;
break;
case MEMTYPE_PROM:
#ifdef DEBUG
prom_printf("prom_chunk[%d]: base=%08lx size=%x\n",
i, pblocks[i].base,
pblocks[i].size);
#endif
i++;
break;
default:
break;
}
}
pblocks[i].size = 0;
max_low_pfn = find_max_low_pfn();
largest = find_largest_memblock();
bootmap_size = init_bootmem(largest->base >> PAGE_SHIFT, max_low_pfn);
for (i = 0; pblocks[i].size; i++)
if (pblocks[i].type == MEMTYPE_FREE)
free_bootmem(pblocks[i].base, pblocks[i].size);
/* This test is simpleminded. It will fail if the bootmem bitmap
falls into multiple adjacent ARC memory areas. */
if (bootmap_size > largest->size) {
prom_printf("CRITIAL: overwriting PROM data.\n");
BUG();
}
/* Reserve the memory bootmap itself */
reserve_bootmem(largest->base, bootmap_size);
printk("PROMLIB: Total free ram %dK / %dMB.\n",
totram >> 10, totram >> 20);
}
void __init
prom_free_prom_memory (void)
{
struct prom_pmemblock *p;
unsigned long freed = 0;
unsigned long addr;
for (p = pblocks; p->size != 0; p++) {
if (p->type != MEMTYPE_PROM)
continue;
addr = PAGE_OFFSET + p->base;
while (addr < p->base + p->size) {
ClearPageReserved(mem_map + MAP_NR(addr));
set_page_count(mem_map + MAP_NR(addr), 1);
free_page(addr);
addr += PAGE_SIZE;
freed += PAGE_SIZE;
}
}
printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
}
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