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// SPDX-License-Identifier: GPL-2.0
/*
* memory.c: PROM library functions for acquiring/using memory descriptors
* given to us from the ARCS firmware.
*
* Copyright (C) 1996 by David S. Miller
* Copyright (C) 1999, 2000, 2001 by Ralf Baechle
* Copyright (C) 1999, 2000 by Silicon Graphics, Inc.
*
* PROM library functions for acquiring/using memory descriptors given to us
* from the ARCS firmware. This is only used when CONFIG_ARC_MEMORY is set
* because on some machines like SGI IP27 the ARC memory configuration data
* completely bogus and alternate easier to use mechanisms are available.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/swap.h>
#include <asm/sgialib.h>
#include <asm/page.h>
#include <asm/bootinfo.h>
#undef DEBUG
#define MAX_PROM_MEM 5
static phys_addr_t prom_mem_base[MAX_PROM_MEM] __initdata;
static phys_addr_t prom_mem_size[MAX_PROM_MEM] __initdata;
static unsigned int nr_prom_mem __initdata;
/*
* For ARC firmware memory functions the unit of measuring memory is always
* a 4k page of memory
*/
#define ARC_PAGE_SHIFT 12
struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
{
return (struct linux_mdesc *) ARC_CALL1(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",
"Standalone Program Pages",
"ARCS Temp Storage Area",
"ARCS Permanent Storage Area"
};
static char *arc_mtypes[8] = {
"Exception Block",
"SystemParameterBlock",
"FreeMemory",
"Bad Memory",
"LoadedProgram",
"FirmwareTemporary",
"FirmwarePermanent",
"FreeContiguous"
};
#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
: arc_mtypes[a.arc]
#endif
enum {
mem_free, mem_prom_used, mem_reserved
};
static inline int memtype_classify_arcs(union linux_memtypes type)
{
switch (type.arcs) {
case arcs_fcontig:
case arcs_free:
return mem_free;
case arcs_atmp:
return mem_prom_used;
case arcs_eblock:
case arcs_rvpage:
case arcs_bmem:
case arcs_prog:
case arcs_aperm:
return mem_reserved;
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 mem_free;
case arc_atmp:
return mem_prom_used;
case arc_eblock:
case arc_rvpage:
case arc_bmem:
case arc_prog:
case arc_aperm:
return mem_reserved;
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);
}
void __weak __init prom_meminit(void)
{
struct linux_mdesc *p;
#ifdef DEBUG
int i = 0;
printk("ARCS MEMORY DESCRIPTOR dump:\n");
p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
while(p) {
printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
i, p, p->base, p->pages, mtypes(p->type));
p = ArcGetMemoryDescriptor(p);
i++;
}
#endif
nr_prom_mem = 0;
p = PROM_NULL_MDESC;
while ((p = ArcGetMemoryDescriptor(p))) {
unsigned long base, size;
long type;
base = p->base << ARC_PAGE_SHIFT;
size = p->pages << ARC_PAGE_SHIFT;
type = prom_memtype_classify(p->type);
/* ignore mirrored RAM on IP28/IP30 */
if (base < PHYS_OFFSET)
continue;
memblock_add(base, size);
if (type == mem_reserved)
memblock_reserve(base, size);
if (type == mem_prom_used) {
memblock_reserve(base, size);
if (nr_prom_mem >= 5) {
pr_err("Too many ROM DATA regions");
continue;
}
prom_mem_base[nr_prom_mem] = base;
prom_mem_size[nr_prom_mem] = size;
nr_prom_mem++;
}
}
}
void __weak __init prom_cleanup(void)
{
}
void __init prom_free_prom_memory(void)
{
int i;
if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
return;
for (i = 0; i < nr_prom_mem; i++) {
free_init_pages("prom memory",
prom_mem_base[i], prom_mem_base[i] + prom_mem_size[i]);
}
/*
* at this point it isn't safe to call PROM functions
* give platforms a way to do PROM cleanups
*/
prom_cleanup();
}
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