[linux-2.6-block.git] / arch / mips / fw / arc / memory.c

// 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/pgtable.h>
#include <asm/bootinfo.h>

#undef DEBUG

/*
 * For ARC firmware memory functions the unit of meassuring 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

static inline int memtype_classify_arcs(union linux_memtypes type)
{
	switch (type.arcs) {
	case arcs_fcontig:
	case arcs_free:
		return BOOT_MEM_RAM;
	case arcs_atmp:
		return BOOT_MEM_ROM_DATA;
	case arcs_eblock:
	case arcs_rvpage:
	case arcs_bmem:
	case arcs_prog:
	case arcs_aperm:
		return BOOT_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 BOOT_MEM_RAM;
	case arc_atmp:
		return BOOT_MEM_ROM_DATA;
	case arc_eblock:
	case arc_rvpage:
	case arc_bmem:
	case arc_prog:
	case arc_aperm:
		return BOOT_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 __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

	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);

		add_memory_region(base, size, type);
	}
}

void __init prom_free_prom_memory(void)
{
	unsigned long addr;
	int i;

	if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
		return;

	for (i = 0; i < boot_mem_map.nr_map; i++) {
		if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
			continue;

		addr = boot_mem_map.map[i].addr;
		free_init_pages("prom memory",
				addr, addr + boot_mem_map.map[i].size);
	}
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
1da177e4 LT	3	* memory.c: PROM library functions for acquiring/using memory descriptors
70342287	4	* given to us from the ARCS firmware.
1da177e4 LT	5	*
	6	* Copyright (C) 1996 by David S. Miller
	7	* Copyright (C) 1999, 2000, 2001 by Ralf Baechle
	8	* Copyright (C) 1999, 2000 by Silicon Graphics, Inc.
	9	*
	10	* PROM library functions for acquiring/using memory descriptors given to us
	11	* from the ARCS firmware. This is only used when CONFIG_ARC_MEMORY is set
	12	* because on some machines like SGI IP27 the ARC memory configuration data
92a76f6d	13	* completely bogus and alternate easier to use mechanisms are available.
1da177e4 LT	14	*/
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/types.h>
	18	#include <linux/sched.h>
	19	#include <linux/mm.h>
57c8a661	20	#include <linux/memblock.h>
1da177e4 LT	21	#include <linux/swap.h>
	22
	23	#include <asm/sgialib.h>
	24	#include <asm/page.h>
	25	#include <asm/pgtable.h>
	26	#include <asm/bootinfo.h>
	27
	28	#undef DEBUG
	29
	30	/*
	31	* For ARC firmware memory functions the unit of meassuring memory is always
	32	* a 4k page of memory
	33	*/
	34	#define ARC_PAGE_SHIFT 12
	35
	36	struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
	37	{
	38	return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
	39	}
	40
	41	#ifdef DEBUG /* convenient for debugging */
	42	static char *arcs_mtypes[8] = {
	43	"Exception Block",
	44	"ARCS Romvec Page",
	45	"Free/Contig RAM",
	46	"Generic Free RAM",
	47	"Bad Memory",
	48	"Standalone Program Pages",
	49	"ARCS Temp Storage Area",
	50	"ARCS Permanent Storage Area"
	51	};
	52
	53	static char *arc_mtypes[8] = {
	54	"Exception Block",
	55	"SystemParameterBlock",
	56	"FreeMemory",
	57	"Bad Memory",
	58	"LoadedProgram",
	59	"FirmwareTemporary",
	60	"FirmwarePermanent",
	61	"FreeContiguous"
	62	};
	63	#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
	64	: arc_mtypes[a.arc]
	65	#endif
	66
49a89efb	67	static inline int memtype_classify_arcs(union linux_memtypes type)
1da177e4 LT	68	{
	69	switch (type.arcs) {
	70	case arcs_fcontig:
	71	case arcs_free:
	72	return BOOT_MEM_RAM;
	73	case arcs_atmp:
	74	return BOOT_MEM_ROM_DATA;
	75	case arcs_eblock:
	76	case arcs_rvpage:
	77	case arcs_bmem:
	78	case arcs_prog:
	79	case arcs_aperm:
	80	return BOOT_MEM_RESERVED;
	81	default:
	82	BUG();
	83	}
	84	while(1); /* Nuke warning. */
	85	}
	86
49a89efb	87	static inline int memtype_classify_arc(union linux_memtypes type)
1da177e4 LT	88	{
	89	switch (type.arc) {
	90	case arc_free:
	91	case arc_fcontig:
	92	return BOOT_MEM_RAM;
	93	case arc_atmp:
	94	return BOOT_MEM_ROM_DATA;
	95	case arc_eblock:
	96	case arc_rvpage:
	97	case arc_bmem:
	98	case arc_prog:
	99	case arc_aperm:
	100	return BOOT_MEM_RESERVED;
	101	default:
	102	BUG();
	103	}
	104	while(1); /* Nuke warning. */
	105	}
	106
49a89efb	107	static int __init prom_memtype_classify(union linux_memtypes type)
1da177e4 LT	108	{
	109	if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
	110	return memtype_classify_arcs(type);
	111
	112	return memtype_classify_arc(type);
	113	}
	114
	115	void __init prom_meminit(void)
	116	{
	117	struct linux_mdesc *p;
	118
	119	#ifdef DEBUG
	120	int i = 0;
	121
36a88530	122	printk("ARCS MEMORY DESCRIPTOR dump:\n");
1da177e4 LT	123	p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
1da177e4 LT	124	while(p) {
36a88530 RB	125	printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
36a88530 RB	126	i, p, p->base, p->pages, mtypes(p->type));
1da177e4 LT	127	p = ArcGetMemoryDescriptor(p);
	128	i++;
	129	}
	130	#endif
	131
	132	p = PROM_NULL_MDESC;
	133	while ((p = ArcGetMemoryDescriptor(p))) {
	134	unsigned long base, size;
	135	long type;
	136
	137	base = p->base << ARC_PAGE_SHIFT;
	138	size = p->pages << ARC_PAGE_SHIFT;
	139	type = prom_memtype_classify(p->type);
	140
	141	add_memory_region(base, size, type);
	142	}
	143	}
	144
c44e8d5e	145	void __init prom_free_prom_memory(void)
1da177e4	146	{
1da177e4 LT	147	unsigned long addr;
	148	int i;
	149
	150	if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
c44e8d5e	151	return;
1da177e4 LT	152
	153	for (i = 0; i < boot_mem_map.nr_map; i++) {
	154	if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
	155	continue;
	156
	157	addr = boot_mem_map.map[i].addr;
c44e8d5e AN	158	free_init_pages("prom memory",
c44e8d5e AN	159	addr, addr + boot_mem_map.map[i].size);
1da177e4	160	}
1da177e4	161	}