[deliverable/linux.git] / arch / sparc / prom / memory.c

/* memory.c: Prom routine for acquiring various bits of information
 *           about RAM on the machine, both virtual and physical.
 *
 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
 */

#include <linux/kernel.h>
#include <linux/sort.h>
#include <linux/init.h>

#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/page.h>

static int __init prom_meminit_v0(void)
{
	struct linux_mlist_v0 *p;
	int index;

	index = 0;
	for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
		sp_banks[index].base_addr = (unsigned long) p->start_adr;
		sp_banks[index].num_bytes = p->num_bytes;
		index++;
	}

	return index;
}

static int __init prom_meminit_v2(void)
{
	struct linux_prom_registers reg[64];
	int node, size, num_ents, i;

	node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
	size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
	num_ents = size / sizeof(struct linux_prom_registers);

	for (i = 0; i < num_ents; i++) {
		sp_banks[i].base_addr = reg[i].phys_addr;
		sp_banks[i].num_bytes = reg[i].reg_size;
	}

	return num_ents;
}

static int sp_banks_cmp(const void *a, const void *b)
{
	const struct sparc_phys_banks *x = a, *y = b;

	if (x->base_addr > y->base_addr)
		return 1;
	if (x->base_addr < y->base_addr)
		return -1;
	return 0;
}

/* Initialize the memory lists based upon the prom version. */
void __init prom_meminit(void)
{
	int i, num_ents = 0;

	switch (prom_vers) {
	case PROM_V0:
		num_ents = prom_meminit_v0();
		break;

	case PROM_V2:
	case PROM_V3:
		num_ents = prom_meminit_v2();
		break;

	default:
		break;
	}
	sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
	     sp_banks_cmp, NULL);

	/* Sentinel.  */
	sp_banks[num_ents].base_addr = 0xdeadbeef;
	sp_banks[num_ents].num_bytes = 0;

	for (i = 0; i < num_ents; i++)
		sp_banks[i].num_bytes &= PAGE_MASK;
}
Commit	Line	Data
ccc34028	1	/* memory.c: Prom routine for acquiring various bits of information
1da177e4 LT	2	* about RAM on the machine, both virtual and physical.
1da177e4 LT	3	*
9f2b2a5f	4	* Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
1da177e4 LT	5	* Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
	6	*/
	7
1da177e4	8	#include <linux/kernel.h>
9f2b2a5f	9	#include <linux/sort.h>
1da177e4 LT	10	#include <linux/init.h>
	11
	12	#include <asm/openprom.h>
1da177e4	13	#include <asm/oplib.h>
9f2b2a5f	14	#include <asm/page.h>
1da177e4	15
9f2b2a5f DM	16	static int __init prom_meminit_v0(void)
	17	{
	18	struct linux_mlist_v0 *p;
	19	int index;
1da177e4	20
9f2b2a5f DM	21	index = 0;
	22	for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
	23	sp_banks[index].base_addr = (unsigned long) p->start_adr;
	24	sp_banks[index].num_bytes = p->num_bytes;
	25	index++;
	26	}
1da177e4	27
9f2b2a5f DM	28	return index;
9f2b2a5f DM	29	}
1da177e4	30
9f2b2a5f	31	static int __init prom_meminit_v2(void)
1da177e4	32	{
9f2b2a5f DM	33	struct linux_prom_registers reg[64];
	34	int node, size, num_ents, i;
	35
	36	node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
	37	size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
	38	num_ents = size / sizeof(struct linux_prom_registers);
	39
	40	for (i = 0; i < num_ents; i++) {
	41	sp_banks[i].base_addr = reg[i].phys_addr;
	42	sp_banks[i].num_bytes = reg[i].reg_size;
1da177e4 LT	43	}
1da177e4 LT	44
9f2b2a5f DM	45	return num_ents;
	46	}
	47
9f2b2a5f DM	48	static int sp_banks_cmp(const void a, const void b)
	49	{
	50	const struct sparc_phys_banks x = a, y = b;
	51
	52	if (x->base_addr > y->base_addr)
	53	return 1;
	54	if (x->base_addr < y->base_addr)
	55	return -1;
	56	return 0;
1da177e4 LT	57	}
	58
	59	/* Initialize the memory lists based upon the prom version. */
	60	void __init prom_meminit(void)
	61	{
9f2b2a5f	62	int i, num_ents = 0;
1da177e4	63
9f2b2a5f	64	switch (prom_vers) {
1da177e4	65	case PROM_V0:
9f2b2a5f	66	num_ents = prom_meminit_v0();
1da177e4	67	break;
9f2b2a5f	68
1da177e4 LT	69	case PROM_V2:
1da177e4 LT	70	case PROM_V3:
9f2b2a5f	71	num_ents = prom_meminit_v2();
1da177e4 LT	72	break;
1da177e4 LT	73
1da177e4 LT	74	default:
1da177e4 LT	75	break;
9f2b2a5f DM	76	}
	77	sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
	78	sp_banks_cmp, NULL);
1da177e4	79
9f2b2a5f DM	80	/* Sentinel. */
	81	sp_banks[num_ents].base_addr = 0xdeadbeef;
	82	sp_banks[num_ents].num_bytes = 0;
	83
	84	for (i = 0; i < num_ents; i++)
	85	sp_banks[i].num_bytes &= PAGE_MASK;
1da177e4	86	}