/* $Id: ip27-memory.c,v 1.2 2000/01/27 01:05:24 ralf Exp $ * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2000 by Ralf Baechle * Copyright (C) 2000 by Silicon Graphics, Inc. * * On SGI IP27 the ARC memory configuration data is completly bogus but * alternate easier to use mechanisms are available. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern char _end; #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) #define SLOT_IGNORED 0xffff short slot_lastfilled_cache[MAX_COMPACT_NODES]; unsigned short slot_psize_cache[MAX_COMPACT_NODES][MAX_MEM_SLOTS]; static pfn_t numpages; static pfn_t pagenr = 0; plat_pg_data_t *plat_node_data[MAX_COMPACT_NODES]; bootmem_data_t plat_node_bdata[MAX_COMPACT_NODES]; int numa_debug(void) { printk("NUMA debug\n"); *(int *)0 = 0; return(0); } /* * Return pfn of first free page of memory on a node. PROM may allocate * data structures on the first couple of pages of the first slot of each * node. If this is the case, getfirstfree(node) > getslotstart(node, 0). */ pfn_t node_getfirstfree(cnodeid_t cnode) { unsigned long loadbase = CKSEG0; nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode); #ifdef CONFIG_MAPPED_KERNEL loadbase = CKSSEG + 16777216; #endif if (cnode == 0) return (KDM_TO_PHYS(PAGE_ALIGN((unsigned long)(&_end)) - (loadbase - K0BASE)) >> PAGE_SHIFT); return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT); } /* * Return the number of pages of memory provided by the given slot * on the specified node. */ pfn_t slot_getsize(cnodeid_t node, int slot) { return (pfn_t) slot_psize_cache[node][slot]; } /* * Return highest slot filled */ int node_getlastslot(cnodeid_t node) { return (int) slot_lastfilled_cache[node]; } /* * Return the pfn of the last free page of memory on a node. */ pfn_t node_getmaxclick(cnodeid_t node) { pfn_t slot_psize; int slot; /* * Start at the top slot. When we find a slot with memory in it, * that's the winner. */ for (slot = (node_getnumslots(node) - 1); slot >= 0; slot--) { if ((slot_psize = slot_getsize(node, slot))) { if (slot_psize == SLOT_IGNORED) continue; /* Return the basepfn + the slot size, minus 1. */ return slot_getbasepfn(node, slot) + slot_psize - 1; } } /* * If there's no memory on the node, return 0. This is likely * to cause problems. */ return (pfn_t)0; } static pfn_t slot_psize_compute(cnodeid_t node, int slot) { nasid_t nasid; lboard_t *brd; klmembnk_t *banks; unsigned long size; nasid = COMPACT_TO_NASID_NODEID(node); /* Find the node board */ brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27); if (!brd) return 0; /* Get the memory bank structure */ banks = (klmembnk_t *)find_first_component(brd, KLSTRUCT_MEMBNK); if (!banks) return 0; /* Size in _Megabytes_ */ size = (unsigned long)banks->membnk_bnksz[slot/4]; /* hack for 128 dimm banks */ if (size <= 128) { if (slot%4 == 0) { size <<= 20; /* size in bytes */ return(size >> PAGE_SHIFT); } else { return 0; } } else { size /= 4; size <<= 20; return(size >> PAGE_SHIFT); } } pfn_t szmem(pfn_t fpage, pfn_t maxpmem) { cnodeid_t node; int slot, numslots; pfn_t num_pages = 0, slot_psize; pfn_t slot0sz = 0, nodebytes; /* Hack to detect problem configs */ int ignore; for (node = 0; node < numnodes; node++) { numslots = node_getnumslots(node); ignore = nodebytes = 0; for (slot = 0; slot < numslots; slot++) { slot_psize = slot_psize_compute(node, slot); if (slot == 0) slot0sz = slot_psize; /* * We need to refine the hack when we have replicated * kernel text. */ nodebytes += SLOT_SIZE; if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) > (slot0sz << PAGE_SHIFT)) ignore = 1; if (ignore && slot_psize) { printk("Ignoring slot %d onwards on node %d\n", slot, node); slot_psize_cache[node][slot] = SLOT_IGNORED; slot = numslots; continue; } num_pages += slot_psize; slot_psize_cache[node][slot] = (unsigned short) slot_psize; if (slot_psize) slot_lastfilled_cache[node] = slot; } } if (maxpmem) return((maxpmem > num_pages) ? num_pages : maxpmem); else return num_pages; } /* * HACK ALERT - Things do not work if this is not here. Maybe this is * acting as a pseudocacheflush operation. The write pattern seems to * be important, writing a 0 does not help. */ void setup_test(cnodeid_t node, pfn_t start, pfn_t end) { unsigned long *ptr = __va(start << PAGE_SHIFT); unsigned long size = 4 * 1024 * 1024; /* 4M L2 caches */ while (size) { size -= sizeof(unsigned long); *ptr = (0xdeadbeefbabeb000UL|node); /* *ptr = 0; */ ptr++; } } /* * Currently, the intranode memory hole support assumes that each slot * contains at least 32 MBytes of memory. We assume all bootmem data * fits on the first slot. */ void __init prom_meminit(void) { extern void mlreset(void); cnodeid_t node; pfn_t slot_firstpfn, slot_lastpfn, slot_freepfn; unsigned long bootmap_size; int node_datasz; node_datasz = PFN_UP(sizeof(plat_pg_data_t)); mlreset(); numpages = szmem(0, 0); for (node = (numnodes - 1); node >= 0; node--) { slot_firstpfn = slot_getbasepfn(node, 0); slot_lastpfn = slot_firstpfn + slot_getsize(node, 0); slot_freepfn = node_getfirstfree(node); /* Foll line hack for non discontigmem; remove once discontigmem * becomes the default. */ max_low_pfn = (slot_lastpfn - slot_firstpfn); if (node != 0) setup_test(node, slot_freepfn, slot_lastpfn); /* * Allocate the node data structure on the node first. */ plat_node_data[node] = (plat_pg_data_t *)(__va(slot_freepfn \ << PAGE_SHIFT)); NODE_DATA(node)->bdata = plat_node_bdata + node; slot_freepfn += node_datasz; bootmap_size = init_bootmem_node(node, slot_freepfn, slot_firstpfn, slot_lastpfn); free_bootmem_node(node, slot_firstpfn << PAGE_SHIFT, (slot_lastpfn - slot_firstpfn) << PAGE_SHIFT); reserve_bootmem_node(node, slot_firstpfn << PAGE_SHIFT, ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size); } printk("Total memory probed : 0x%lx pages\n", numpages); } int __init page_is_ram(unsigned long pagenr) { return 1; } void __init prom_free_prom_memory (void) { /* We got nothing to free here ... */ } #ifdef CONFIG_DISCONTIGMEM void __init paging_init(void) { cnodeid_t node; unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; /* Initialize the entire pgd. */ pgd_init((unsigned long)swapper_pg_dir); pmd_init((unsigned long)invalid_pmd_table); memset((void *)invalid_pte_table, 0, sizeof(pte_t) * 2 * PTRS_PER_PTE); for (node = 0; node < numnodes; node++) { pfn_t start_pfn = slot_getbasepfn(node, 0); pfn_t end_pfn = node_getmaxclick(node); zones_size[ZONE_DMA] = end_pfn + 1 - start_pfn; free_area_init_node(node, NODE_DATA(node), zones_size, start_pfn << PAGE_SHIFT, 0); if ((PLAT_NODE_DATA_STARTNR(node) + PLAT_NODE_DATA_SIZE(node)) > pagenr) pagenr = PLAT_NODE_DATA_STARTNR(node) + PLAT_NODE_DATA_SIZE(node); } } void __init mem_init(void) { extern char _stext, _etext, _fdata, _edata; extern char __init_begin, __init_end; extern unsigned long totalram_pages; extern unsigned long setup_zero_pages(void); cnodeid_t nid; unsigned long tmp, ram; unsigned long codesize, reservedpages, datasize, initsize; int slot, numslots; struct page *pg, *pslot; pfn_t pgnr; num_physpages = numpages; /* memory already sized by szmem */ max_mapnr = pagenr; /* already found during paging_init */ high_memory = (void *) __va(max_mapnr << PAGE_SHIFT); for (nid = 0; nid < numnodes; nid++) { /* * Hack till free_area_init_core() zeroes free_pages */ for (tmp = 0; tmp < MAX_NR_ZONES; tmp++) PLAT_NODE_DATA(nid)->gendata.node_zones[tmp].free_pages=0; /* * This will free up the bootmem, ie, slot 0 memory. */ totalram_pages += free_all_bootmem_node(nid); /* * We need to manually do the other slots. */ pg = NODE_DATA(nid)->node_mem_map + slot_getsize(nid, 0); pgnr = PLAT_NODE_DATA_STARTNR(nid) + slot_getsize(nid, 0); numslots = node_getlastslot(nid); for (slot = 1; slot <= numslots; slot++) { pslot = NODE_DATA(nid)->node_mem_map + slot_getbasepfn(nid, slot) - slot_getbasepfn(nid, 0); /* * Mark holes in previous slot. May also want to * free up the pages that hold the memmap entries. */ while (pg < pslot) { pg->flags |= (1<count, 1); __free_page(pg); totalram_pages++; pg++; pgnr++; } } } totalram_pages -= setup_zero_pages(); /* This comes from node 0 */ reservedpages = ram = 0; for (nid = 0; nid < numnodes; nid++) { for (tmp = PLAT_NODE_DATA_STARTNR(nid); tmp < (PLAT_NODE_DATA_STARTNR(nid) + PLAT_NODE_DATA_SIZE(nid)); tmp++) { /* Ignore holes */ if (PageSkip(mem_map+tmp)) continue; if (page_is_ram(tmp)) { ram++; if (PageReserved(mem_map+tmp)) reservedpages++; } } } codesize = (unsigned long) &_etext - (unsigned long) &_stext; datasize = (unsigned long) &_edata - (unsigned long) &_fdata; initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, " "%ldk data, %ldk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), ram << (PAGE_SHIFT-10), codesize >> 10, reservedpages << (PAGE_SHIFT-10), datasize >> 10, initsize >> 10); } #endif /* CONFIG_DISCONTIGMEM */