patch-2.4.19 linux-2.4.19/arch/ppc64/kernel/lmb.c

• Lines: 385
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/ppc64/kernel/lmb.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/ppc64/kernel/lmb.c linux-2.4.19/arch/ppc64/kernel/lmb.c
@@ -0,0 +1,384 @@
+/*
+ *
+ * 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 <asm/types.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/lmb.h>
+#include <asm/abs_addr.h>
+#include <asm/bitops.h>
+#include <asm/udbg.h>
+
+extern unsigned long klimit;
+extern unsigned long reloc_offset(void);
+
+
+static long lmb_add_region(struct lmb_region *, unsigned long, unsigned long, unsigned long);
+
+struct lmb lmb = {
+	0,
+	{0,0,0,0,{{0,0,0}}},
+	{0,0,0,0,{{0,0,0}}}
+};
+
+
+/* Assumption: base addr of region 1 < base addr of region 2 */
+static void
+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->region[i].type = rgn->region[i+1].type;
+	}
+	rgn->cnt--;
+}
+
+
+/* This routine called with relocation disabled. */
+void
+lmb_init(void)
+{
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&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.region[0].type = LMB_MEMORY_AREA;
+	_lmb->memory.cnt = 1;
+
+	/* Ditto. */
+	_lmb->reserved.region[0].base = 0;
+	_lmb->reserved.region[0].size = 0;
+	_lmb->reserved.region[0].type = LMB_MEMORY_AREA;
+	_lmb->reserved.cnt = 1;
+}
+
+/* This routine called with relocation disabled. */
+void
+lmb_analyze(void)
+{
+	unsigned long i;
+	unsigned long mem_size = 0;
+	unsigned long io_size = 0;
+	unsigned long size_mask = 0;
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&lmb);
+#ifdef CONFIG_MSCHUNKS
+	unsigned long physbase = 0;
+#endif
+
+	for (i=0; i < _lmb->memory.cnt ;i++) {
+		unsigned long lmb_type = _lmb->memory.region[i].type;
+		unsigned long lmb_size;
+
+		if ( lmb_type != LMB_MEMORY_AREA )
+			continue;
+
+		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;
+	}
+
+#ifdef CONFIG_MSCHUNKS
+	for (i=0; i < _lmb->memory.cnt ;i++) {
+		unsigned long lmb_type = _lmb->memory.region[i].type;
+		unsigned long lmb_size;
+
+		if ( lmb_type != LMB_IO_AREA )
+			continue;
+
+		lmb_size = _lmb->memory.region[i].size;
+
+		_lmb->memory.region[i].physbase = physbase;
+		physbase += lmb_size;
+		io_size += lmb_size;
+		size_mask |= lmb_size;
+	}
+#endif /* CONFIG_MSCHUNKS */
+
+	_lmb->memory.size = mem_size;
+	_lmb->memory.iosize = io_size;
+	_lmb->memory.lcd_size = (1UL << cnt_trailing_zeros(size_mask));
+}
+
+/* This routine called with relocation disabled. */
+long
+lmb_add(unsigned long base, unsigned long size)
+{
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&lmb);
+	struct lmb_region *_rgn = &(_lmb->memory);
+
+	return lmb_add_region(_rgn, base, size, LMB_MEMORY_AREA);
+
+}
+
+#ifdef CONFIG_MSCHUNKS
+/* This routine called with relocation disabled. */
+long
+lmb_add_io(unsigned long base, unsigned long size)
+{
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&lmb);
+	struct lmb_region *_rgn = &(_lmb->memory);
+
+	return lmb_add_region(_rgn, base, size, LMB_IO_AREA);
+
+}
+#endif /* CONFIG_MSCHUNKS */
+
+long
+lmb_reserve(unsigned long base, unsigned long size)
+{
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&lmb);
+	struct lmb_region *_rgn = &(_lmb->reserved);
+
+	return lmb_add_region(_rgn, base, size, LMB_MEMORY_AREA);
+}
+
+/* This routine called with relocation disabled. */
+static long
+lmb_add_region(struct lmb_region *rgn, unsigned long base, unsigned long size,
+		unsigned long type)
+{
+	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;
+		unsigned long rgntype = rgn->region[i].type;
+
+		if ( rgntype != type )
+			continue;
+
+		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;
+			rgn->region[i+1].type = rgn->region[i].type;
+		}  else {
+			rgn->region[i+1].base = base;
+			rgn->region[i+1].physbase = lmb_abs_to_phys(base);
+			rgn->region[i+1].size = size;
+			rgn->region[i+1].type = type;
+			break;
+		}
+	}
+	rgn->cnt++;
+
+	return 0;
+}
+
+long
+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
+lmb_alloc(unsigned long size, unsigned long align)
+{
+	long i, j;
+	unsigned long base;
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&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;
+		unsigned long lmbtype = _mem->region[i].type;
+
+		if ( lmbtype != LMB_MEMORY_AREA )
+			continue;
+
+		base = _ALIGN_DOWN(lmbbase+lmbsize-size, align);
+
+		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, LMB_MEMORY_AREA);
+
+	return base;
+}
+
+unsigned long
+lmb_phys_mem_size(void)
+{
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&lmb);
+#ifdef CONFIG_MSCHUNKS
+	return _lmb->memory.size;
+#else
+	struct lmb_region *_mem = &(_lmb->memory);
+	unsigned long idx = _mem->cnt-1;
+	unsigned long lastbase = _mem->region[idx].physbase;
+	unsigned long lastsize = _mem->region[idx].size;
+	
+	return (lastbase + lastsize);
+#endif /* CONFIG_MSCHUNKS */
+}
+
+unsigned long
+lmb_end_of_DRAM(void)
+{
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&lmb);
+	struct lmb_region *_mem = &(_lmb->memory);
+	unsigned long idx;
+
+	for(idx=_mem->cnt-1; idx >= 0 ;idx--) {
+		if ( _mem->region[idx].type != LMB_MEMORY_AREA )
+			continue;
+#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
+lmb_abs_to_phys(unsigned long aa)
+{
+	unsigned long i, pa = aa;
+	unsigned long offset = reloc_offset();
+	struct lmb *_lmb = PTRRELOC(&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;
+}
+
+void
+lmb_dump(char *str)
+{
+	unsigned long i;
+
+	udbg_printf("\nlmb_dump: %s\n", str);
+	udbg_printf("    debug                       = %s\n",
+		(lmb.debug) ? "TRUE" : "FALSE");
+	udbg_printf("    memory.cnt                  = %d\n",
+		lmb.memory.cnt);
+	udbg_printf("    memory.size                 = 0x%lx\n",
+		lmb.memory.size);
+	udbg_printf("    memory.lcd_size             = 0x%lx\n",
+		lmb.memory.lcd_size);
+	for (i=0; i < lmb.memory.cnt ;i++) {
+		udbg_printf("    memory.region[%d].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("                      .type     = 0x%lx\n",
+			lmb.memory.region[i].type);
+	}
+
+	udbg_printf("\n");
+	udbg_printf("    reserved.cnt                = %d\n",
+		lmb.reserved.cnt);
+	udbg_printf("    reserved.size               = 0x%lx\n",
+		lmb.reserved.size);
+	udbg_printf("    reserved.lcd_size           = 0x%lx\n",
+		lmb.reserved.lcd_size);
+	for (i=0; i < lmb.reserved.cnt ;i++) {
+		udbg_printf("    reserved.region[%d].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);
+		udbg_printf("                      .type     = 0x%lx\n",
+			lmb.reserved.region[i].type);
+	}
+}