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extend mmap wrapper functionality

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@960 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2012-08-28 22:56:20 +00:00
parent 5e417de5a9
commit ca69c3e5a0
1 changed files with 44 additions and 5 deletions
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49
linux/plat.c
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@ -17,9 +17,17 @@
#include <time.h> #include <time.h>
#include <unistd.h> #include <unistd.h>
#include <sys/mman.h> #include <sys/mman.h>
#include <errno.h>
#include "../common/plat.h" #include "../common/plat.h"
/* XXX: maybe unhardcode pagesize? */
#define HUGETLB_PAGESIZE (2 * 1024 * 1024)
#define HUGETLB_THRESHOLD (HUGETLB_PAGESIZE / 2)
#ifndef MAP_HUGETLB
#define MAP_HUGETLB 0x40000 /* arch specific */
#endif
int plat_is_dir(const char *path) int plat_is_dir(const char *path)
{ {
@ -126,16 +134,36 @@ int plat_wait_event(int *fds_hnds, int count, int timeout_ms)
return ret; return ret;
} }
void *plat_mmap(unsigned long addr, size_t size) void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
{ {
static int hugetlb_disabled;
int prot = PROT_READ | PROT_WRITE;
int flags = MAP_PRIVATE | MAP_ANONYMOUS;
void *req, *ret; void *req, *ret;
req = (void *)addr; req = (void *)addr;
ret = mmap(req, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); if (need_exec)
prot |= PROT_EXEC;
if (is_fixed)
flags |= MAP_FIXED;
if (size >= HUGETLB_THRESHOLD && !hugetlb_disabled)
flags |= MAP_HUGETLB;
ret = mmap(req, size, prot, flags, -1, 0);
if (ret == MAP_FAILED && (flags & MAP_HUGETLB)) {
fprintf(stderr,
"warning: failed to do hugetlb mmap (%p, %zu): %d\n",
req, size, errno);
hugetlb_disabled = 1;
flags &= ~MAP_HUGETLB;
ret = mmap(req, size, prot, flags, -1, 0);
}
if (ret == MAP_FAILED) if (ret == MAP_FAILED)
return NULL; return NULL;
if (ret != req)
printf("warning: mmaped to %p, requested %p\n", ret, req); if (req != NULL && ret != req)
fprintf(stderr,
"warning: mmaped to %p, requested %p\n", ret, req);
return ret; return ret;
} }
@ -155,7 +183,18 @@ void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
void plat_munmap(void *ptr, size_t size) void plat_munmap(void *ptr, size_t size)
{ {
munmap(ptr, size); int ret;
ret = munmap(ptr, size);
if (ret != 0 && (size & (HUGETLB_PAGESIZE - 1))) {
// prehaps an autorounded hugetlb mapping?
size = (size + HUGETLB_PAGESIZE - 1) & ~(HUGETLB_PAGESIZE - 1);
ret = munmap(ptr, size);
}
if (ret != 0) {
fprintf(stderr,
"munmap(%p, %zu) failed: %d\n", ptr, size, errno);
}
} }
/* lprintf */ /* lprintf */