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/Ethereal-msm8939-beta9/arch/mips/fw/arc/memory.c

https://bitbucket.org/MilosStamenkovic95/etherealos
C | 160 lines | 123 code | 20 blank | 17 comment | 8 complexity | aa36ea4365cc59ccccd82487d81cbbc7 MD5 | raw file
  1/*
  2 * memory.c: PROM library functions for acquiring/using memory descriptors
  3 *	     given to us from the ARCS firmware.
  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
 12 * completly bogus and alternate easier to use mechanisms are available.
 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
 35struct 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 */
 41static 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
 52static 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
 66static inline int memtype_classify_arcs(union linux_memtypes type)
 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
 86static inline int memtype_classify_arc(union linux_memtypes type)
 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
106static int __init prom_memtype_classify(union linux_memtypes type)
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
114void __init prom_meminit(void)
115{
116	struct linux_mdesc *p;
117
118#ifdef DEBUG
119	int i = 0;
120
121	printk("ARCS MEMORY DESCRIPTOR dump:\n");
122	p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
123	while(p) {
124		printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
125		       i, p, p->base, p->pages, mtypes(p->type));
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
144void __init prom_free_prom_memory(void)
145{
146	unsigned long addr;
147	int i;
148
149	if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
150		return;
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;
157		free_init_pages("prom memory",
158				addr, addr + boot_mem_map.map[i].size);
159	}
160}