lmb.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:10k
- /*
- *
- * 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 <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,{{0,0,0}}}
- };
- /* 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);
- /* 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, 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)
- {
- return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
- }
- unsigned long
- lmb_alloc_base(unsigned long size, unsigned long align, unsigned long max_addr)
- {
- long i, j;
- unsigned long base = 0;
- 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;
- 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, 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: %sn", str);
- udbg_printf(" debug = %sn",
- (lmb.debug) ? "TRUE" : "FALSE");
- udbg_printf(" memory.cnt = %dn",
- lmb.memory.cnt);
- udbg_printf(" memory.size = 0x%lxn",
- lmb.memory.size);
- udbg_printf(" memory.lcd_size = 0x%lxn",
- lmb.memory.lcd_size);
- for (i=0; i < lmb.memory.cnt ;i++) {
- udbg_printf(" memory.region[%d].base = 0x%lxn",
- i, lmb.memory.region[i].base);
- udbg_printf(" .physbase = 0x%lxn",
- lmb.memory.region[i].physbase);
- udbg_printf(" .size = 0x%lxn",
- lmb.memory.region[i].size);
- udbg_printf(" .type = 0x%lxn",
- lmb.memory.region[i].type);
- }
- udbg_printf("n");
- udbg_printf(" reserved.cnt = %dn",
- lmb.reserved.cnt);
- udbg_printf(" reserved.size = 0x%lxn",
- lmb.reserved.size);
- udbg_printf(" reserved.lcd_size = 0x%lxn",
- lmb.reserved.lcd_size);
- for (i=0; i < lmb.reserved.cnt ;i++) {
- udbg_printf(" reserved.region[%d].base = 0x%lxn",
- i, lmb.reserved.region[i].base);
- udbg_printf(" .physbase = 0x%lxn",
- lmb.reserved.region[i].physbase);
- udbg_printf(" .size = 0x%lxn",
- lmb.reserved.region[i].size);
- udbg_printf(" .type = 0x%lxn",
- lmb.reserved.region[i].type);
- }
- }