[U-Boot-Users] [PATCH 5/9] [new uImage] Introduce lmb from linux kernel for memory mgmt of boot images
Kumar Gala
galak at kernel.crashing.org
Thu Feb 28 04:51:47 CET 2008
Introduce the LMB lib used on PPC in the kernel as a clean way to manage
the memory spaces used by various boot images and structures. This code
will allow us to simplify the code in bootm and its support functions.
Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
---
common/cmd_bootm.c | 14 +++
include/image.h | 2 +
include/lmb.h | 54 ++++++++++
lib_generic/Makefile | 1 +
lib_generic/lmb.c | 280 ++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 351 insertions(+), 0 deletions(-)
create mode 100644 include/lmb.h
create mode 100644 lib_generic/lmb.c
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index e5ed167..92c18d0 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -34,6 +34,7 @@
#include <zlib.h>
#include <bzlib.h>
#include <environment.h>
+#include <lmb.h>
#include <asm/byteorder.h>
#ifdef CFG_HUSH_PARSER
@@ -118,8 +119,19 @@ int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
ulong image_start, image_end;
ulong load_start, load_end;
+ struct lmb lmb;
+
memset ((void *)&images, 0, sizeof (images));
images.verify = getenv_verify();
+ images.lmb = &lmb;
+
+ lmb_init(&lmb);
+
+#ifdef CFG_SDRAM_BASE
+ lmb_add(&lmb, CFG_SDRAM_BASE, gd->bd->bi_memsize);
+#else
+ lmb_add(&lmb, 0, gd->bd->bi_memsize);
+#endif
/* get kernel image header, start address and length */
os_hdr = get_kernel (cmdtp, flag, argc, argv,
@@ -237,6 +249,8 @@ int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
show_boot_progress (8);
+ lmb_reserve(&lmb, load_start, (load_end - load_start));
+
switch (os) {
default: /* handled by (original) Linux case */
case IH_OS_LINUX:
diff --git a/include/image.h b/include/image.h
index 025ec0f..cb4acd8 100644
--- a/include/image.h
+++ b/include/image.h
@@ -37,6 +37,7 @@
#include <command.h>
#ifndef USE_HOSTCC
+#include <lmb.h>
#include <linux/string.h>
#include <asm/u-boot.h>
@@ -203,6 +204,7 @@ typedef struct bootm_headers {
char *fit_uname_fdt; /* FDT blob node unit name */
#endif
int verify; /* getenv("verify")[0] != 'n' */
+ struct lmb *lmb; /* for memory mgmt */
#endif
} bootm_headers_t;
diff --git a/include/lmb.h b/include/lmb.h
new file mode 100644
index 0000000..cc64cbb
--- /dev/null
+++ b/include/lmb.h
@@ -0,0 +1,54 @@
+#ifndef _LINUX_LMB_H
+#define _LINUX_LMB_H
+#ifdef __KERNEL__
+
+#include <asm/types.h>
+/*
+ * Logical memory blocks.
+ *
+ * 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.
+ */
+
+#define MAX_LMB_REGIONS 8
+
+struct lmb_property {
+ ulong base;
+ ulong size;
+};
+
+struct lmb_region {
+ unsigned long cnt;
+ ulong size;
+ struct lmb_property region[MAX_LMB_REGIONS+1];
+};
+
+struct lmb {
+ struct lmb_region memory;
+ struct lmb_region reserved;
+};
+
+extern struct lmb lmb;
+
+extern void lmb_init(struct lmb *lmb);
+extern long lmb_add(struct lmb *lmb, ulong base, ulong size);
+extern long lmb_reserve(struct lmb *lmb, ulong base, ulong size);
+extern ulong lmb_alloc(struct lmb *lmb, ulong size, ulong align);
+extern ulong lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr);
+extern ulong __lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr);
+extern int lmb_is_reserved(struct lmb *lmb, ulong addr);
+
+extern void lmb_dump_all(struct lmb *lmb);
+
+static inline ulong
+lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
+{
+ return type->region[region_nr].size;
+}
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_LMB_H */
diff --git a/lib_generic/Makefile b/lib_generic/Makefile
index 9713353..b10793b 100644
--- a/lib_generic/Makefile
+++ b/lib_generic/Makefile
@@ -34,6 +34,7 @@ COBJS-y += crc32.o
COBJS-y += ctype.o
COBJS-y += display_options.o
COBJS-y += div64.o
+COBJS-y += lmb.o
COBJS-y += ldiv.o
COBJS-y += sha1.o
COBJS-y += string.o
diff --git a/lib_generic/lmb.c b/lib_generic/lmb.c
new file mode 100644
index 0000000..3b8c805
--- /dev/null
+++ b/lib_generic/lmb.c
@@ -0,0 +1,280 @@
+/*
+ * 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 <common.h>
+#include <lmb.h>
+
+#define LMB_ALLOC_ANYWHERE 0
+
+void lmb_dump_all(struct lmb *lmb)
+{
+#ifdef DEBUG
+ unsigned long i;
+
+ debug("lmb_dump_all:\n");
+ debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt);
+ debug(" memory.size = 0x%08x\n", lmb->memory.size);
+ for (i=0; i < lmb->memory.cnt ;i++) {
+ debug(" memory.reg[0x%x].base = 0x%08x\n", i,
+ lmb->memory.region[i].base);
+ debug(" .size = 0x%08x\n",
+ lmb->memory.region[i].size);
+ }
+
+ debug("\n reserved.cnt = 0x%lx\n", lmb->reserved.cnt);
+ debug(" reserved.size = 0x%08x\n", lmb->reserved.size);
+ for (i=0; i < lmb->reserved.cnt ;i++) {
+ debug(" reserved.reg[0x%x].base = 0x%08x\n", i,
+ lmb->reserved.region[i].base);
+ debug(" .size = 0x%08x\n",
+ lmb->reserved.region[i].size);
+ }
+#endif /* DEBUG */
+}
+
+static unsigned long lmb_addrs_overlap(ulong base1,
+ ulong size1, ulong base2, ulong size2)
+{
+ return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
+}
+
+static long lmb_addrs_adjacent(ulong base1, ulong size1,
+ ulong base2, ulong size2)
+{
+ if (base2 == base1 + size1)
+ return 1;
+ else if (base1 == base2 + size2)
+ return -1;
+
+ return 0;
+}
+
+static long lmb_regions_adjacent(struct lmb_region *rgn,
+ unsigned long r1, unsigned long r2)
+{
+ ulong base1 = rgn->region[r1].base;
+ ulong size1 = rgn->region[r1].size;
+ ulong base2 = rgn->region[r2].base;
+ ulong size2 = rgn->region[r2].size;
+
+ return lmb_addrs_adjacent(base1, size1, base2, size2);
+}
+
+static void 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 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);
+}
+
+void lmb_init(struct 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;
+ lmb->memory.size = 0;
+
+ /* Ditto. */
+ lmb->reserved.region[0].base = 0;
+ lmb->reserved.region[0].size = 0;
+ lmb->reserved.cnt = 1;
+ lmb->reserved.size = 0;
+}
+
+/* This routine called with relocation disabled. */
+static long lmb_add_region(struct lmb_region *rgn, ulong base, ulong size)
+{
+ unsigned long coalesced = 0;
+ long adjacent, i;
+
+ if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
+ rgn->region[0].base = base;
+ rgn->region[0].size = size;
+ return 0;
+ }
+
+ /* First try and coalesce this LMB with another. */
+ for (i=0; i < rgn->cnt; i++) {
+ ulong rgnbase = rgn->region[i].base;
+ ulong 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;
+ }
+ }
+
+ if (base < rgn->region[0].base) {
+ rgn->region[0].base = base;
+ rgn->region[0].size = size;
+ }
+
+ rgn->cnt++;
+
+ return 0;
+}
+
+/* This routine may be called with relocation disabled. */
+long lmb_add(struct lmb *lmb, ulong base, ulong size)
+{
+ struct lmb_region *_rgn = &(lmb->memory);
+
+ return lmb_add_region(_rgn, base, size);
+}
+
+long lmb_reserve(struct lmb *lmb, ulong base, ulong size)
+{
+ struct lmb_region *_rgn = &(lmb->reserved);
+
+ return lmb_add_region(_rgn, base, size);
+}
+
+long lmb_overlaps_region(struct lmb_region *rgn, ulong base,
+ ulong size)
+{
+ unsigned long i;
+
+ for (i=0; i < rgn->cnt; i++) {
+ ulong rgnbase = rgn->region[i].base;
+ ulong rgnsize = rgn->region[i].size;
+ if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
+ break;
+ }
+ }
+
+ return (i < rgn->cnt) ? i : -1;
+}
+
+ulong lmb_alloc(struct lmb *lmb, ulong size, ulong align)
+{
+ return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
+}
+
+ulong lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
+{
+ ulong alloc;
+
+ alloc = __lmb_alloc_base(lmb, size, align, max_addr);
+
+ if (alloc == 0)
+ printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
+ size, max_addr);
+
+ return alloc;
+}
+
+static ulong lmb_align_down(ulong addr, ulong size)
+{
+ return addr & ~(size - 1);
+}
+
+static ulong lmb_align_up(ulong addr, ulong size)
+{
+ return (addr + (size - 1)) & ~(size - 1);
+}
+
+ulong __lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
+{
+ long i, j;
+ ulong base = 0;
+
+ for (i = lmb->memory.cnt-1; i >= 0; i--) {
+ ulong lmbbase = lmb->memory.region[i].base;
+ ulong lmbsize = lmb->memory.region[i].size;
+
+ if (max_addr == LMB_ALLOC_ANYWHERE)
+ base = lmb_align_down(lmbbase + lmbsize - size, align);
+ else if (lmbbase < max_addr) {
+ base = min(lmbbase + lmbsize, max_addr);
+ base = lmb_align_down(base - size, align);
+ } else
+ continue;
+
+ while ((lmbbase <= base) &&
+ ((j = lmb_overlaps_region(&(lmb->reserved), base, size)) >= 0) )
+ base = lmb_align_down(lmb->reserved.region[j].base - size,
+ align);
+
+ if ((base != 0) && (lmbbase <= base))
+ break;
+ }
+
+ if (i < 0)
+ return 0;
+
+ if (lmb_add_region(&(lmb->reserved), base, lmb_align_up(size, align)) < 0)
+ return 0;
+
+ return base;
+}
+
+int lmb_is_reserved(struct lmb *lmb, ulong addr)
+{
+ int i;
+
+ for (i = 0; i < lmb->reserved.cnt; i++) {
+ ulong upper = lmb->reserved.region[i].base +
+ lmb->reserved.region[i].size - 1;
+ if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
+ return 1;
+ }
+ return 0;
+}
--
1.5.4.1
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