[mirror_ubuntu-hirsute-kernel.git] / arch / mips / fw / arc / memory.c

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