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Always return an aligned block when mapping memory.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2185 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
bbahnsen 2007-01-07 19:09:33 +00:00
parent a53078b634
commit 6bb60d710b
1 changed files with 21 additions and 11 deletions
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32
EdkUnixPkg/Sec/SecMain.c
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@ -313,18 +313,28 @@ MapMemory (
INTN prot,
INTN flags)
{
static UINTN base = 0x40000000;
const UINTN align = (1 << 24);
void *res;
res = mmap ((void *)base, length, prot, flags, fd, 0);
if (res == MAP_FAILED)
return NULL;
// Guard page.
base += length + 4096;
base = (base + align - 1) & ~(align - 1);
STATIC UINTN base = 0x40000000;
CONST UINTN align = (1 << 24);
VOID *res;
BOOLEAN isAligned = 0;
//
// Try to get an aligned block somewhere in the address space of this
// process.
//
while((!isAligned) && (base != 0)) {
res = mmap ((void *)base, length, prot, flags, fd, 0);
if (res == MAP_FAILED) {
return NULL;
}
if ((((UINTN)res) & ~(align-1)) == (UINTN)res) {
isAligned=1;
}
else {
munmap(res, length);
base += align;
}
}
return res;
}