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let drivers allocate memory at 64k physical boundary.

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This commit is contained in:
Ben Gras
2009-02-12 12:26:08 +00:00
parent 6ac0338584
commit 59e972f074
8 changed files with 55 additions and 19 deletions
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20
lib/syslib/alloc_util.c
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@@ -29,6 +29,8 @@ void *alloc_contig(size_t len, int flags, phys_bytes *phys)
if(flags & AC_LOWER16M)
mmapflags |= MAP_LOWER16M;
if(flags & AC_ALIGN64K)
mmapflags |= MAP_ALIGN64K;
/* First try to get memory with mmap. This is gauranteed
* to be page-aligned, and we can tell VM it has to be
@@ -44,20 +46,22 @@ void *alloc_contig(size_t len, int flags, phys_bytes *phys)
* so we can page align it ourselves.
*/
if(buf == (vir_bytes) MAP_FAILED) {
u32_t align = 0;
if(errno != (_SIGN ENXIO)) {
return NULL;
}
#define ALIGN 4096
if(flags & AC_ALIGN4K) {
if(len + ALIGN < len)
return NULL;
len += ALIGN;
}
if(flags & AC_ALIGN4K)
align = 4*1024;
if(flags & AC_ALIGN64K)
align = 64*1024;
if(len + align < len)
return NULL;
len += align;
if(!(buf = (vir_bytes) malloc(len))) {
return NULL;
}
if(flags & AC_ALIGN4K)
buf += ALIGN - (buf % ALIGN);
if(align)
buf += align - (buf % align);
}
/* Get physical address. */