patch-2.4.20 linux-2.4.20/arch/mips/sgi-ip27/ip27-memory.c
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- Lines: 345
- Date:
Thu Nov 28 15:53:10 2002
- Orig file:
linux-2.4.19/arch/mips/sgi-ip27/ip27-memory.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/arch/mips/sgi-ip27/ip27-memory.c linux-2.4.20/arch/mips/sgi-ip27/ip27-memory.c
@@ -0,0 +1,344 @@
+/*
+ * 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 <linux/init.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>
+
+#include <asm/page.h>
+#include <asm/bootinfo.h>
+#include <asm/addrspace.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/sn/types.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/klconfig.h>
+#include <asm/sn/arch.h>
+#include <asm/mmzone.h>
+
+/* ip27-klnuma.c */
+extern pfn_t node_getfirstfree(cnodeid_t cnode);
+
+#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;
+
+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 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;
+}
+
+/*
+ * 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);
+
+ /*
+ * 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_DATA(node), slot_freepfn,
+ slot_firstpfn, slot_lastpfn);
+ free_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
+ (slot_lastpfn - slot_firstpfn) << PAGE_SHIFT);
+ reserve_bootmem_node(NODE_DATA(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
+
+static pfn_t pagenr = 0;
+
+void __init paging_init(void)
+{
+ pmd_t *pmd = kpmdtbl;
+ pte_t *pte = kptbl;
+
+ cnodeid_t node;
+ unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+ int i;
+
+ /* Initialize the entire pgd. */
+ pgd_init((unsigned long)swapper_pg_dir);
+ pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
+ memset((void *)invalid_pte_table, 0, sizeof(pte_t) * PTRS_PER_PTE);
+
+ /* This is for vmalloc */
+ memset((void *)kptbl, 0, PAGE_SIZE << PGD_ORDER);
+ memset((void *)kpmdtbl, 0, PAGE_SIZE);
+ pgd_set(swapper_pg_dir, kpmdtbl);
+ for (i = 0; i < (1 << PGD_ORDER); pmd++,i++,pte+=PTRS_PER_PTE)
+ pmd_val(*pmd) = (unsigned long)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), 0, 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;
+ unsigned long codesize, 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(NODE_DATA(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++; pgnr++;
+ }
+
+ /*
+ * Free valid memory in current slot.
+ */
+ pslot += slot_getsize(nid, slot);
+ while (pg < pslot) {
+ if (!page_is_ram(pgnr))
+ continue;
+ ClearPageReserved(pg);
+ atomic_set(&pg->count, 1);
+ __free_page(pg);
+ totalram_pages++;
+ pg++; pgnr++;
+ }
+ }
+ }
+
+ totalram_pages -= setup_zero_pages(); /* This comes from node 0 */
+
+ codesize = (unsigned long) &_etext - (unsigned long) &_stext;
+ datasize = (unsigned long) &_edata - (unsigned long) &_fdata;
+ initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+ tmp = (unsigned long) nr_free_pages();
+ printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
+ "%ldk data, %ldk init)\n",
+ tmp << (PAGE_SHIFT-10),
+ num_physpages << (PAGE_SHIFT-10),
+ codesize >> 10,
+ (num_physpages - tmp) << (PAGE_SHIFT-10),
+ datasize >> 10,
+ initsize >> 10);
+}
+
+#endif /* CONFIG_DISCONTIGMEM */
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