Messages in this thread Patch in this message | | | From | monstr@monstr ... | Subject | [PATCH 12/52] [microblaze] lmb support | Date | Thu, 24 Jan 2008 16:02:47 +0100 |
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From: Michal Simek <monstr@monstr.eu>
Signed-off-by: Michal Simek <monstr@monstr.eu> --- arch/microblaze/mm/lmb.c | 342 ++++++++++++++++++++++++++++++++++++++++++ include/asm-microblaze/lmb.h | 84 ++++++++++ 2 files changed, 426 insertions(+), 0 deletions(-) create mode 100644 arch/microblaze/mm/lmb.c create mode 100644 include/asm-microblaze/lmb.h
diff --git a/arch/microblaze/mm/lmb.c b/arch/microblaze/mm/lmb.c new file mode 100644 index 0000000..993ea49 --- /dev/null +++ b/arch/microblaze/mm/lmb.c @@ -0,0 +1,342 @@ +/* + * Procedures for maintaining information about logical memory blocks. + * + * 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/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> +#ifdef CONFIG_PPC32 +#include "mmu_decl.h" /* for __max_low_memory */ +#endif + +#define DEBUG + +#ifdef DEBUG +#define DBG(fmt...) printk(fmt) +#else +#define DBG(fmt...) +#endif + +#define LMB_ALLOC_ANYWHERE 0 + +struct lmb lmb; + +void lmb_dump_all(void) +{ +#ifdef DEBUG + unsigned int i; + + DBG("lmb_dump_all:\n"); + DBG(" memory.cnt = 0x%lx\n", lmb.memory.cnt); + DBG(" memory.size = 0x%lx\n", lmb.memory.size); + for (i = 0; i < lmb.memory.cnt ; i++) { + DBG(" memory.region[0x%x].base = 0x%lx\n", + i, lmb.memory.region[i].base); + DBG(" .size = 0x%lx\n", + lmb.memory.region[i].size); + } + + DBG("\n reserved.cnt = 0x%lx\n", lmb.reserved.cnt); + DBG(" reserved.size = 0x%lx\n", lmb.reserved.size); + for (i = 0; i < lmb.reserved.cnt ; i++) { + DBG(" reserved.region[0x%x].base = 0x%lx\n", + i, lmb.reserved.region[i].base); + DBG(" .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); +} + +static void __init lmb_remove_region(struct lmb_region *rgn, unsigned long r) +{ + unsigned long i; + + for (i = r; i < rgn->cnt - 1; i++) { + rgn->region[i].base = rgn->region[i + 1].base; + rgn->region[i].size = rgn->region[i + 1].size; + } + rgn->cnt--; +} + +/* 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) +{ + rgn->region[r1].size += rgn->region[r2].size; + lmb_remove_region(rgn, r2); +} + +/* This routine called with relocation disabled. */ +void __init lmb_init(void) +{ + /* 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 may be called with relocation disabled. */ +void __init lmb_analyze(void) +{ + int i; + + lmb.memory.size = 0; + + for (i = 0; i < lmb.memory.cnt; i++) + lmb.memory.size += lmb.memory.region[i].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; + + if ((rgnbase == base) && (rgnsize == size)) + /* Already have this region, so we're done */ + return 0; + + adjacent = lmb_addrs_adjacent(base, size, rgnbase, rgnsize); + if (adjacent > 0) { + rgn->region[i].base -= 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; + 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].size = rgn->region[i].size; + } else { + rgn->region[i+1].base = base; + rgn->region[i+1].size = size; + break; + } + } + rgn->cnt++; + + return 0; +} + +/* This routine may be called with relocation disabled. */ +long __init lmb_add(unsigned long base, unsigned long size) +{ + 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_region *_rgn = &(lmb.reserved); + + BUG_ON(0 == size); + + 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) +{ + unsigned long alloc; + + alloc = __lmb_alloc_base(size, align, max_addr); + + if (alloc == 0) + panic("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n", + size, max_addr); + + return alloc; +} + +unsigned long __init __lmb_alloc_base(unsigned long size, unsigned long align, + unsigned long max_addr) +{ + long i, j; + unsigned long base = 0; + + BUG_ON(0 == size); + +#ifdef CONFIG_PPC32 + /* On 32-bit, make sure we allocate lowmem */ + if (max_addr == LMB_ALLOC_ANYWHERE) + max_addr = __max_low_memory; +#endif + for (i = lmb.memory.cnt-1; i >= 0; i--) { + unsigned long lmbbase = lmb.memory.region[i].base; + unsigned long lmbsize = lmb.memory.region[i].size; + + if (max_addr == LMB_ALLOC_ANYWHERE) + base = _ALIGN_DOWN(lmbbase + lmbsize - size, align); + else if (lmbbase < max_addr) { + base = min(lmbbase + lmbsize, max_addr); + base = _ALIGN_DOWN(base - size, align); + } else + continue; + + while ((lmbbase <= base) && + ((j = lmb_overlaps_region(&lmb.reserved, base, size)) + >= 0)) + base = _ALIGN_DOWN(lmb.reserved.region[j].base - size, + align); + + if ((base != 0) && (lmbbase <= base)) + break; + } + + if (i < 0) + return 0; + + lmb_add_region(&lmb.reserved, base, size); + + return base; +} + +/* You must call lmb_analyze() before this. */ +unsigned long __init lmb_phys_mem_size(void) +{ + return lmb.memory.size; +} + +unsigned long __init lmb_end_of_DRAM(void) +{ + int idx = lmb.memory.cnt - 1; + + return (lmb.memory.region[idx].base + lmb.memory.region[idx].size); +} + +/* You must call lmb_analyze() after this. */ +void __init lmb_enforce_memory_limit(unsigned long memory_limit) +{ + unsigned long i, limit; + struct lmb_property *p; + + if (!memory_limit) + return; + + /* Truncate the lmb regions to satisfy the memory limit. */ + limit = memory_limit; + for (i = 0; i < lmb.memory.cnt; i++) { + if (limit > lmb.memory.region[i].size) { + limit -= lmb.memory.region[i].size; + continue; + } + + lmb.memory.region[i].size = limit; + lmb.memory.cnt = i + 1; + break; + } + + if (lmb.memory.region[0].size < lmb.rmo_size) + lmb.rmo_size = lmb.memory.region[0].size; + + /* And truncate any reserves above the limit also. */ + for (i = 0; i < lmb.reserved.cnt; i++) { + p = &lmb.reserved.region[i]; + + if (p->base > memory_limit) + p->size = 0; + else if ((p->base + p->size) > memory_limit) + p->size = memory_limit - p->base; + + if (p->size == 0) { + lmb_remove_region(&lmb.reserved, i); + i--; + } + } +} diff --git a/include/asm-microblaze/lmb.h b/include/asm-microblaze/lmb.h new file mode 100644 index 0000000..f27bb13 --- /dev/null +++ b/include/asm-microblaze/lmb.h @@ -0,0 +1,84 @@ +/* + * include/asm-microblaze/lmb.h + * + * Definitions for talking to the Open Firmware PROM on + * Power Macintosh computers. + * + * Copyright (C) 2001 Peter Bergner, IBM Corp. + * + * 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. + */ + +#ifndef _ASM_LMB_H +#define _ASM_LMB_H +#ifdef __KERNEL__ + +#include <linux/init.h> +#include <asm/prom.h> + +#define MAX_LMB_REGIONS 128 + +struct lmb_property { + unsigned long base; + unsigned long size; +}; + +struct lmb_region { + unsigned long cnt; + unsigned long size; + struct lmb_property region[MAX_LMB_REGIONS+1]; +}; + +struct lmb { + unsigned long debug; + unsigned long rmo_size; + struct lmb_region memory; + struct lmb_region reserved; +}; + +extern struct lmb lmb; + +extern void __init lmb_init(void); +extern void __init lmb_analyze(void); +extern long __init lmb_add(unsigned long base, unsigned long size); +extern long __init lmb_reserve(unsigned long base, unsigned long size); +extern unsigned long __init lmb_alloc(unsigned long size, unsigned long align); +extern unsigned long __init lmb_alloc_base(unsigned long size, + unsigned long align, unsigned long max_addr); +extern unsigned long __init __lmb_alloc_base(unsigned long size, + unsigned long align, unsigned long max_addr); +extern unsigned long __init lmb_phys_mem_size(void); +extern unsigned long __init lmb_end_of_DRAM(void); +extern void __init lmb_enforce_memory_limit(unsigned long memory_limit); +extern long __init lmb_overlaps_region(struct lmb_region *rgn, + unsigned long base, unsigned long size); + +extern void lmb_dump_all(void); + +static inline unsigned long +lmb_size_bytes(struct lmb_region *type, unsigned long region_nr) +{ + return type->region[region_nr].size; +} +static inline unsigned long +lmb_size_pages(struct lmb_region *type, unsigned long region_nr) +{ + return lmb_size_bytes(type, region_nr) >> PAGE_SHIFT; +} +static inline unsigned long +lmb_start_pfn(struct lmb_region *type, unsigned long region_nr) +{ + return type->region[region_nr].base >> PAGE_SHIFT; +} +static inline unsigned long +lmb_end_pfn(struct lmb_region *type, unsigned long region_nr) +{ + return lmb_start_pfn(type, region_nr) + + lmb_size_pages(type, region_nr); +} + +#endif /* __KERNEL__ */ +#endif /* _ASM_LMB_H */ -- 1.5.4.rc4.14.g6fc74
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