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[porthole] make the segments private and add a method to obtain the ptr

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This commit is contained in:
Geoffrey McRae 2019-11-12 15:43:44 +11:00
parent 453b8e6a4d
commit 76007092d5
4 changed files with 23 additions and 14 deletions
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2
VERSION
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@ -1 +1 @@
B1-40-g968b313993+1 B1-41-g453b8e6a4d+1

8
porthole/include/porthole/types.h
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@ -22,18 +22,10 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include <stdbool.h> #include <stdbool.h>
#include <stdint.h> #include <stdint.h>
typedef struct
{
unsigned int size;
void * data;
}
PortholeSegment;
typedef struct typedef struct
{ {
uint32_t id; uint32_t id;
unsigned int size; unsigned int size;
unsigned int num_segments; unsigned int num_segments;
PortholeSegment segments[0];
} }
PortholeMap; PortholeMap;

8
porthole/include/porthole/util.h
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@ -52,3 +52,11 @@ void porthole_copy_map_to_mem(PortholeMap * src, void * dst, size_t len, off_t o
* @param dst_off The offset into the dst PortholeMap * @param dst_off The offset into the dst PortholeMap
*/ */
void porthole_copy_map_to_map(PortholeMap * src, PortholeMap * dst, size_t len, off_t src_off, off_t dst_off); void porthole_copy_map_to_map(PortholeMap * src, PortholeMap * dst, size_t len, off_t src_off, off_t dst_off);
/**
* Get the pointer to the base of a PortholeMap
*
* @param map The map to get the pointer for
* @return The base address of the mapping, or NULL if the mapping is not contiguous
*/
void * porthole_get_map_ptr(PortholeMap *map);

17
porthole/src/util.c
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@ -17,6 +17,7 @@ this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA Place, Suite 330, Boston, MA 02111-1307 USA
*/ */
#include "types.h"
#include "porthole/util.h" #include "porthole/util.h"
#include "common/debug.h" #include "common/debug.h"
@ -28,7 +29,7 @@ void porthole_copy_mem_to_map(void * src, PortholeMap * dst, size_t len, off_t o
DEBUG_FATAL("Attempt to write beyond the length of destination mapping"); DEBUG_FATAL("Attempt to write beyond the length of destination mapping");
/* find the start segment */ /* find the start segment */
PortholeSegment * seg = &dst->segments[0]; PortholeSegment * seg = PH_SEGMENTS(dst);
while(off) while(off)
{ {
if (seg->size > off) if (seg->size > off)
@ -62,7 +63,7 @@ void porthole_copy_map_to_mem(PortholeMap * src, void * dst, size_t len, off_t o
DEBUG_FATAL("Attempt to read beyond the length of the source mapping"); DEBUG_FATAL("Attempt to read beyond the length of the source mapping");
/* find the start segment */ /* find the start segment */
PortholeSegment * seg = &src->segments[0]; PortholeSegment * seg = PH_SEGMENTS(src);
while(off) while(off)
{ {
if (seg->size > off) if (seg->size > off)
@ -99,7 +100,7 @@ void porthole_copy_map_to_map(PortholeMap * src, PortholeMap * dst, size_t len,
DEBUG_FATAL("Attempt to write beyond the length of the destination mapping"); DEBUG_FATAL("Attempt to write beyond the length of the destination mapping");
/* find the start segments */ /* find the start segments */
PortholeSegment * src_seg = &src->segments[0]; PortholeSegment * src_seg = PH_SEGMENTS(src);
while(src_off) while(src_off)
{ {
if (src_seg->size > src_off) if (src_seg->size > src_off)
@ -109,7 +110,7 @@ void porthole_copy_map_to_map(PortholeMap * src, PortholeMap * dst, size_t len,
++src_seg; ++src_seg;
} }
PortholeSegment * dst_seg = &dst->segments[0]; PortholeSegment * dst_seg = PH_SEGMENTS(dst);
while(dst_off) while(dst_off)
{ {
if (dst_seg->size > dst_off) if (dst_seg->size > dst_off)
@ -150,3 +151,11 @@ void porthole_copy_map_to_map(PortholeMap * src, PortholeMap * dst, size_t len,
len -= avail; len -= avail;
} }
} }
void * porthole_get_map_ptr(PortholeMap *map)
{
if (map->num_segments != 1)
return NULL;
return PH_SEGMENTS(map)[0].data;
}