[SeaBIOS] [PATCH v3 2/5] pmm: support looking up a given pattern in FSEG
Michael S. Tsirkin
mst at redhat.com
Sun Sep 22 15:17:21 CEST 2013
Will be used to find RSDP there.
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
---
src/util.h | 2 ++
src/pmm.c | 18 ++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/src/util.h b/src/util.h
index 6944cfb..f66e65a 100644
--- a/src/util.h
+++ b/src/util.h
@@ -431,6 +431,8 @@ static inline void free(void *data) {
pmm_free(data);
}
+void *pmm_find_fseg_pattern(void *pattern, unsigned pattern_size);
+
// mtrr.c
void mtrr_setup(void);
diff --git a/src/pmm.c b/src/pmm.c
index 8f993fd..86cf86f 100644
--- a/src/pmm.c
+++ b/src/pmm.c
@@ -374,6 +374,24 @@ calcRamSize(void)
LegacyRamSize = rs >= 1024*1024 ? rs : 1024*1024;
}
+// Find the data block in FSEG matching a given pattern.
+void *pmm_find_fseg_pattern(void *pattern, unsigned pattern_size)
+{
+ struct allocinfo_s *info;
+ hlist_for_each_entry(info, &ZoneFSeg.head, node) {
+ unsigned space = info->dataend - info->data;
+ int off;
+
+ if (space < pattern_size)
+ continue;
+ for (off = 0; off < space - pattern_size; ++off) {
+ if (!memcmp(info->data + off, pattern, pattern_size))
+ return info->data + off;
+ }
+ }
+ return NULL;
+}
+
// Update pointers after code relocation.
void
malloc_init(void)
--
MST
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