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Memory allocated through win32 VirtualAlloc() is zero-filled. Likewise for

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memory mmap()'ed with MAP_ANONYMOUS (equivalent to /dev/zero mapping but
faster)
This commit is contained in:
gbeauche 2006-02-27 00:04:12 +00:00
parent 735c332ab7
commit 077a232acc
1 changed files with 0 additions and 15 deletions
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15
BasiliskII/src/Unix/vm_alloc.cpp
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@ -286,10 +286,6 @@ void * vm_acquire(size_t size, int options)
next_address = (char *)addr + size;
// Since I don't know the standard behavior of mmap(), zero-fill here
if (memset(addr, 0, size) != addr)
return VM_MAP_FAILED;
// Remap to 33-bit space
#ifdef USE_33BIT_ADDRESSING
if (sizeof(void *) == 8 && (options & VM_MAP_33BIT)) {
@ -305,10 +301,6 @@ void * vm_acquire(size_t size, int options)
#ifdef HAVE_WIN32_VM
if ((addr = VirtualAlloc(NULL, size, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE)) == NULL)
return VM_MAP_FAILED;
// Zero newly allocated memory
if (memset(addr, 0, size) != addr)
return VM_MAP_FAILED;
#else
if ((addr = calloc(size, 1)) == 0)
return VM_MAP_FAILED;
@ -365,10 +357,6 @@ int vm_acquire_fixed(void * addr, size_t size, int options)
if (mmap((caddr_t)addr, size, VM_PAGE_DEFAULT, the_map_flags, fd, 0) == (void *)MAP_FAILED)
return -1;
// Since I don't know the standard behavior of mmap(), zero-fill here
if (memset(addr, 0, size) != addr)
return -1;
// Remap to 33-bit space
#ifdef USE_33BIT_ADDRESSING
if (sizeof(void *) == 8 && (options & VM_MAP_33BIT)) {
@ -392,9 +380,6 @@ int vm_acquire_fixed(void * addr, size_t size, int options)
LPVOID ret_addr = VirtualAlloc(req_addr, req_size, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if (ret_addr != req_addr)
return -1;
// Zero newly allocated memory
if (memset(addr, 0, size) != addr)
return -1;
#else
// Unsupported