memory.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * memory.c: PROM library functions for acquiring/using memory descriptors
- * given to us from the ARCS firmware.
- *
- * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
- */
- #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
- struct linux_mdesc * __init
- ArcGetMemoryDescriptor(struct linux_mdesc *Current)
- {
- return romvec->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;
- prom_printf("ARCS MEMORY DESCRIPTOR dump:n");
- p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
- while(p) {
- prom_printf("[%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 << PAGE_SHIFT;
- size = p->pages << PAGE_SHIFT;
- type = prom_memtype_classify(p->type);
- add_memory_region(base, size, type);
- }
- }
- void __init
- prom_free_prom_memory (void)
- {
- unsigned long freed = 0;
- unsigned long addr;
- int i;
- 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;
- while (addr < boot_mem_map.map[i].addr
- + boot_mem_map.map[i].size) {
- ClearPageReserved(virt_to_page(__va(addr)));
- set_page_count(virt_to_page(__va(addr)), 1);
- free_page((unsigned long)__va(addr));
- addr += PAGE_SIZE;
- freed += PAGE_SIZE;
- }
- }
- printk("Freeing prom memory: %ldkb freedn", freed >> 10);
- }