162 lines
3.6 KiB
C
162 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* memory.c: PROM library functions for acquiring/using memory descriptors
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* given to us from the ARCS firmware.
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*
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* Copyright (C) 1996 by David S. Miller
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* Copyright (C) 1999, 2000, 2001 by Ralf Baechle
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* Copyright (C) 1999, 2000 by Silicon Graphics, Inc.
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*
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* PROM library functions for acquiring/using memory descriptors given to us
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* from the ARCS firmware. This is only used when CONFIG_ARC_MEMORY is set
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* because on some machines like SGI IP27 the ARC memory configuration data
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* completely bogus and alternate easier to use mechanisms are available.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/swap.h>
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#include <asm/sgialib.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/bootinfo.h>
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#undef DEBUG
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/*
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* For ARC firmware memory functions the unit of meassuring memory is always
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* a 4k page of memory
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*/
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#define ARC_PAGE_SHIFT 12
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struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
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{
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return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
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}
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#ifdef DEBUG /* convenient for debugging */
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static char *arcs_mtypes[8] = {
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"Exception Block",
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"ARCS Romvec Page",
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"Free/Contig RAM",
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"Generic Free RAM",
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"Bad Memory",
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"Standalone Program Pages",
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"ARCS Temp Storage Area",
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"ARCS Permanent Storage Area"
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};
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static char *arc_mtypes[8] = {
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"Exception Block",
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"SystemParameterBlock",
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"FreeMemory",
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"Bad Memory",
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"LoadedProgram",
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"FirmwareTemporary",
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"FirmwarePermanent",
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"FreeContiguous"
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};
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#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
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: arc_mtypes[a.arc]
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#endif
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static inline int memtype_classify_arcs(union linux_memtypes type)
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{
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switch (type.arcs) {
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case arcs_fcontig:
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case arcs_free:
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return BOOT_MEM_RAM;
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case arcs_atmp:
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return BOOT_MEM_ROM_DATA;
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case arcs_eblock:
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case arcs_rvpage:
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case arcs_bmem:
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case arcs_prog:
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case arcs_aperm:
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return BOOT_MEM_RESERVED;
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default:
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BUG();
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}
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while(1); /* Nuke warning. */
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}
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static inline int memtype_classify_arc(union linux_memtypes type)
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{
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switch (type.arc) {
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case arc_free:
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case arc_fcontig:
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return BOOT_MEM_RAM;
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case arc_atmp:
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return BOOT_MEM_ROM_DATA;
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case arc_eblock:
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case arc_rvpage:
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case arc_bmem:
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case arc_prog:
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case arc_aperm:
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return BOOT_MEM_RESERVED;
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default:
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BUG();
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}
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while(1); /* Nuke warning. */
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}
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static int __init prom_memtype_classify(union linux_memtypes type)
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{
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if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
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return memtype_classify_arcs(type);
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return memtype_classify_arc(type);
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}
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void __init prom_meminit(void)
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{
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struct linux_mdesc *p;
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#ifdef DEBUG
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int i = 0;
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printk("ARCS MEMORY DESCRIPTOR dump:\n");
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p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
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while(p) {
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printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
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i, p, p->base, p->pages, mtypes(p->type));
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p = ArcGetMemoryDescriptor(p);
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i++;
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}
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#endif
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p = PROM_NULL_MDESC;
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while ((p = ArcGetMemoryDescriptor(p))) {
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unsigned long base, size;
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long type;
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base = p->base << ARC_PAGE_SHIFT;
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size = p->pages << ARC_PAGE_SHIFT;
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type = prom_memtype_classify(p->type);
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add_memory_region(base, size, type);
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}
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}
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void __init prom_free_prom_memory(void)
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{
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unsigned long addr;
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int i;
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if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
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return;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
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continue;
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addr = boot_mem_map.map[i].addr;
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free_init_pages("prom memory",
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addr, addr + boot_mem_map.map[i].size);
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}
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}
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