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I noticed that free regions provided by search_global_resources() don't have

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the reserved regions substracted from them.  This patch introduces a check
to weed them out, splitting when necessary

Signed-off-by: Robert Millan <rmh@aybabtu.com>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>


git-svn-id: svn://coreboot.org/repository/coreboot-v3@937 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Jordan Crouse 2008-10-17 22:49:50 +00:00
parent 5d37f8595c
commit 20621bdadb
1 changed files with 57 additions and 16 deletions
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73
arch/x86/multiboot.c
View file

@ -25,42 +25,83 @@
static struct multiboot_mmap_entry *mb_mem;
static void build_mb_mem_range(void *gp, struct device *dev, struct resource *res)
static struct {
u64 addr;
u64 len;
} reserved_mem[2];
static void build_mb_mem_range_nooverlap(u64 addr, u64 len)
{
mb_mem->addr = res->base;
mb_mem->len = res->size;
int i;
for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
/* free region fully contained in reserved region, abort */
if (addr >= reserved_mem[i].addr && addr + len <= reserved_mem[i].addr + reserved_mem[i].len)
return;
/* reserved region splits free region */
if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
build_mb_mem_range_nooverlap(addr, reserved_mem[i].addr - addr);
build_mb_mem_range_nooverlap(reserved_mem[i].addr + reserved_mem[i].len, (addr + len) - (reserved_mem[i].addr + reserved_mem[i].len));
return;
}
/* left overlap */
if (addr < reserved_mem[i].addr + reserved_mem[i].len && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
len += addr;
addr = reserved_mem[i].addr + reserved_mem[i].len;
len -= addr;
/* len += addr - old_addr */
continue;
}
/* right overlap */
if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr) {
len = reserved_mem[i].addr - addr;
continue;
}
/* none of the above, just add it */
}
mb_mem->addr = addr;
mb_mem->len = len;
mb_mem->type = 1;
mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
mb_mem++;
}
static void build_mb_mem_range(void *gp, struct device *dev, struct resource *res)
{
build_mb_mem_range_nooverlap(res->base, res->size);
}
unsigned long write_multiboot_info(
unsigned long low_table_start, unsigned long low_table_end,
unsigned long rom_table_start, unsigned long rom_table_end)
{
struct multiboot_info *mbi = rom_table_end;
struct multiboot_info *mbi;
int i;
mbi = rom_table_end;
memset(mbi, 0, sizeof(*mbi));
rom_table_end += sizeof(*mbi);
mbi->mmap_addr = (u32) rom_table_end;
mb_mem = rom_table_end;
/* reserved regions */
reserved_mem[0].addr = low_table_start;
reserved_mem[0].len = low_table_end - low_table_start;
reserved_mem[1].addr = rom_table_start;
reserved_mem[1].len = rom_table_end - rom_table_start;
for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
mb_mem->addr = reserved_mem[i].addr;
mb_mem->len = reserved_mem[i].len;
mb_mem->type = 2;
mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
mb_mem++;
}
/* free regions */
search_global_resources( IORESOURCE_MEM | IORESOURCE_CACHEABLE,
IORESOURCE_MEM | IORESOURCE_CACHEABLE, build_mb_mem_range, NULL);
/* reserved regions */
mb_mem->addr = low_table_start;
mb_mem->len = low_table_end - low_table_start;
mb_mem->type = 2;
mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
mb_mem++;
mb_mem->addr = rom_table_start;
mb_mem->len = rom_table_end - rom_table_start;
mb_mem->type = 2;
mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
mb_mem++;
mbi->mmap_length = ((u32) mb_mem) - mbi->mmap_addr;
mbi->flags |= MB_INFO_MEM_MAP;