1 files changed, 372 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/lmb.c b/arch/ppc64/kernel/lmb.c
new file mode 100644
index 000000000000..d6c6bd03d2a4
--- /dev/null
+++ b/arch/ppc64/kernel/lmb.c
@@ -0,0 +1,372 @@
+/*
+ * Procedures for interfacing to Open Firmware.
+ *
+ * Peter Bergner, IBM Corp.     June 2001.
+ * Copyright (C) 2001 Peter Bergner.
+ * 
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <asm/types.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/lmb.h>
+#include <asm/abs_addr.h>
+
+struct lmb lmb;
+
+#undef DEBUG
+
+void lmb_dump_all(void)
+{
+#ifdef DEBUG
+        unsigned long i;
+        struct lmb *_lmb  = &lmb;
+
+        udbg_printf("lmb_dump_all:\n");
+        udbg_printf("    memory.cnt               = 0x%lx\n",
+                    _lmb->memory.cnt);
+        udbg_printf("    memory.size              = 0x%lx\n",
+                    _lmb->memory.size);
+        for (i=0; i < _lmb->memory.cnt ;i++) {
+                udbg_printf("    memory.region[0x%x].base       = 0x%lx\n",
+                            i, _lmb->memory.region[i].base);
+                udbg_printf("                 .physbase = 0x%lx\n",
+                            _lmb->memory.region[i].physbase);
+                udbg_printf("                 .size     = 0x%lx\n",
+                            _lmb->memory.region[i].size);
+        }
+
+        udbg_printf("\n    reserved.cnt   = 0x%lx\n",
+                    _lmb->reserved.cnt);
+        udbg_printf("    reserved.size    = 0x%lx\n",
+                    _lmb->reserved.size);
+        for (i=0; i < _lmb->reserved.cnt ;i++) {
+                udbg_printf("    reserved.region[0x%x].base       = 0x%lx\n",
+                            i, _lmb->reserved.region[i].base);
+                udbg_printf("                 .physbase = 0x%lx\n",
+                            _lmb->reserved.region[i].physbase);
+                udbg_printf("                 .size     = 0x%lx\n",
+                            _lmb->reserved.region[i].size);
+        }
+#endif /* DEBUG */
+}
+
+static unsigned long __init
+lmb_addrs_overlap(unsigned long base1, unsigned long size1,
+                  unsigned long base2, unsigned long size2)
+{
+        return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
+}
+
+static long __init
+lmb_addrs_adjacent(unsigned long base1, unsigned long size1,
+                   unsigned long base2, unsigned long size2)
+{
+        if (base2 == base1 + size1)
+                return 1;
+        else if (base1 == base2 + size2)
+                return -1;
+
+        return 0;
+}
+
+static long __init
+lmb_regions_adjacent(struct lmb_region *rgn, unsigned long r1, unsigned long r2)
+{
+        unsigned long base1 = rgn->region[r1].base;
+        unsigned long size1 = rgn->region[r1].size;
+        unsigned long base2 = rgn->region[r2].base;
+        unsigned long size2 = rgn->region[r2].size;
+
+        return lmb_addrs_adjacent(base1, size1, base2, size2);
+}
+
+/* Assumption: base addr of region 1 < base addr of region 2 */
+static void __init
+lmb_coalesce_regions(struct lmb_region *rgn, unsigned long r1, unsigned long r2)
+{
+        unsigned long i;
+
+        rgn->region[r1].size += rgn->region[r2].size;
+        for (i=r2; i < rgn->cnt-1; i++) {
+                rgn->region[i].base = rgn->region[i+1].base;
+                rgn->region[i].physbase = rgn->region[i+1].physbase;
+                rgn->region[i].size = rgn->region[i+1].size;
+        }
+        rgn->cnt--;
+}
+
+/* This routine called with relocation disabled. */
+void __init
+lmb_init(void)
+{
+        struct lmb *_lmb = &lmb;
+
+        /* Create a dummy zero size LMB which will get coalesced away later.
+         * This simplifies the lmb_add() code below...
+         */
+        _lmb->memory.region[0].base = 0;
+        _lmb->memory.region[0].size = 0;
+        _lmb->memory.cnt = 1;
+
+        /* Ditto. */
+        _lmb->reserved.region[0].base = 0;
+        _lmb->reserved.region[0].size = 0;
+        _lmb->reserved.cnt = 1;
+}
+
+/* This routine called with relocation disabled. */
+void __init
+lmb_analyze(void)
+{
+        unsigned long i;
+        unsigned long mem_size = 0;
+        unsigned long size_mask = 0;
+        struct lmb *_lmb = &lmb;
+#ifdef CONFIG_MSCHUNKS
+        unsigned long physbase = 0;
+#endif
+
+        for (i=0; i < _lmb->memory.cnt; i++) {
+                unsigned long lmb_size;
+
+                lmb_size = _lmb->memory.region[i].size;
+
+#ifdef CONFIG_MSCHUNKS
+                _lmb->memory.region[i].physbase = physbase;
+                physbase += lmb_size;
+#else
+                _lmb->memory.region[i].physbase = _lmb->memory.region[i].base;
+#endif
+                mem_size += lmb_size;
+                size_mask |= lmb_size;
+        }
+
+        _lmb->memory.size = mem_size;
+}
+
+/* This routine called with relocation disabled. */
+static long __init
+lmb_add_region(struct lmb_region *rgn, unsigned long base, unsigned long size)
+{
+        unsigned long i, coalesced = 0;
+        long adjacent;
+
+        /* First try and coalesce this LMB with another. */
+        for (i=0; i < rgn->cnt; i++) {
+                unsigned long rgnbase = rgn->region[i].base;
+                unsigned long rgnsize = rgn->region[i].size;
+
+                adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
+                if ( adjacent > 0 ) {
+                        rgn->region[i].base -= size;
+                        rgn->region[i].physbase -= size;
+                        rgn->region[i].size += size;
+                        coalesced++;
+                        break;
+                }
+                else if ( adjacent < 0 ) {
+                        rgn->region[i].size += size;
+                        coalesced++;
+                        break;
+                }
+        }
+
+        if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
+                lmb_coalesce_regions(rgn, i, i+1);
+                coalesced++;
+        }
+
+        if ( coalesced ) {
+                return coalesced;
+        } else if ( rgn->cnt >= MAX_LMB_REGIONS ) {
+                return -1;
+        }
+
+        /* Couldn't coalesce the LMB, so add it to the sorted table. */
+        for (i=rgn->cnt-1; i >= 0; i--) {
+                if (base < rgn->region[i].base) {
+                        rgn->region[i+1].base = rgn->region[i].base;
+                        rgn->region[i+1].physbase = rgn->region[i].physbase;
+                        rgn->region[i+1].size = rgn->region[i].size;
+                }  else {
+                        rgn->region[i+1].base = base;
+                        rgn->region[i+1].physbase = lmb_abs_to_phys(base);
+                        rgn->region[i+1].size = size;
+                        break;
+                }
+        }
+        rgn->cnt++;
+
+        return 0;
+}
+
+/* This routine called with relocation disabled. */
+long __init
+lmb_add(unsigned long base, unsigned long size)
+{
+        struct lmb *_lmb = &lmb;
+        struct lmb_region *_rgn = &(_lmb->memory);
+
+        /* On pSeries LPAR systems, the first LMB is our RMO region. */
+        if ( base == 0 )
+                _lmb->rmo_size = size;
+
+        return lmb_add_region(_rgn, base, size);
+
+}
+
+long __init
+lmb_reserve(unsigned long base, unsigned long size)
+{
+        struct lmb *_lmb = &lmb;
+        struct lmb_region *_rgn = &(_lmb->reserved);
+
+        return lmb_add_region(_rgn, base, size);
+}
+
+long __init
+lmb_overlaps_region(struct lmb_region *rgn, unsigned long base, unsigned long size)
+{
+        unsigned long i;
+
+        for (i=0; i < rgn->cnt; i++) {
+                unsigned long rgnbase = rgn->region[i].base;
+                unsigned long rgnsize = rgn->region[i].size;
+                if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
+                        break;
+                }
+        }
+
+        return (i < rgn->cnt) ? i : -1;
+}
+
+unsigned long __init
+lmb_alloc(unsigned long size, unsigned long align)
+{
+        return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
+}
+
+unsigned long __init
+lmb_alloc_base(unsigned long size, unsigned long align, unsigned long max_addr)
+{
+        long i, j;
+        unsigned long base = 0;
+        struct lmb *_lmb = &lmb;
+        struct lmb_region *_mem = &(_lmb->memory);
+        struct lmb_region *_rsv = &(_lmb->reserved);
+
+        for (i=_mem->cnt-1; i >= 0; i--) {
+                unsigned long lmbbase = _mem->region[i].base;
+                unsigned long lmbsize = _mem->region[i].size;
+
+                if ( max_addr == LMB_ALLOC_ANYWHERE )
+                        base = _ALIGN_DOWN(lmbbase+lmbsize-size, align);
+                else if ( lmbbase < max_addr )
+                        base = _ALIGN_DOWN(min(lmbbase+lmbsize,max_addr)-size, align);
+                else
+                        continue;
+
+                while ( (lmbbase <= base) &&
+                        ((j = lmb_overlaps_region(_rsv,base,size)) >= 0) ) {
+                        base = _ALIGN_DOWN(_rsv->region[j].base-size, align);
+                }
+
+                if ( (base != 0) && (lmbbase <= base) )
+                        break;
+        }
+
+        if ( i < 0 )
+                return 0;
+
+        lmb_add_region(_rsv, base, size);
+
+        return base;
+}
+
+unsigned long __init
+lmb_phys_mem_size(void)
+{
+        struct lmb *_lmb = &lmb;
+#ifdef CONFIG_MSCHUNKS
+        return _lmb->memory.size;
+#else
+        struct lmb_region *_mem = &(_lmb->memory);
+        unsigned long total = 0;
+        int i;
+
+        /* add all physical memory to the bootmem map */
+        for (i=0; i < _mem->cnt; i++)
+                total += _mem->region[i].size;
+        return total;
+#endif /* CONFIG_MSCHUNKS */
+}
+
+unsigned long __init
+lmb_end_of_DRAM(void)
+{
+        struct lmb *_lmb = &lmb;
+        struct lmb_region *_mem = &(_lmb->memory);
+        int idx = _mem->cnt - 1;
+
+#ifdef CONFIG_MSCHUNKS
+        return (_mem->region[idx].physbase + _mem->region[idx].size);
+#else
+        return (_mem->region[idx].base + _mem->region[idx].size);
+#endif /* CONFIG_MSCHUNKS */
+
+        return 0;
+}
+
+unsigned long __init
+lmb_abs_to_phys(unsigned long aa)
+{
+        unsigned long i, pa = aa;
+        struct lmb *_lmb = &lmb;
+        struct lmb_region *_mem = &(_lmb->memory);
+
+        for (i=0; i < _mem->cnt; i++) {
+                unsigned long lmbbase = _mem->region[i].base;
+                unsigned long lmbsize = _mem->region[i].size;
+                if ( lmb_addrs_overlap(aa,1,lmbbase,lmbsize) ) {
+                        pa = _mem->region[i].physbase + (aa - lmbbase);
+                        break;
+                }
+        }
+
+        return pa;
+}
+
+/*
+ * Truncate the lmb list to memory_limit if it's set
+ * You must call lmb_analyze() after this.
+ */
+void __init lmb_enforce_memory_limit(void)
+{
+        extern unsigned long memory_limit;
+        unsigned long i, limit;
+        struct lmb_region *mem = &(lmb.memory);
+
+        if (! memory_limit)
+                return;
+
+        limit = memory_limit;
+        for (i = 0; i < mem->cnt; i++) {
+                if (limit > mem->region[i].size) {
+                        limit -= mem->region[i].size;
+                        continue;
+                }
+
+                mem->region[i].size = limit;
+                mem->cnt = i + 1;
+                break;
+        }
+}