Minor updates

src/platform.c

@@ -1,8 +1,31 @@
 #include "base_core.h"
 #include <stdlib.h>
+#include <stdio.h>
 #include <unistd.h>
 #include <sys/mman.h>
 
+
+U32 platform_page_size(void)
+{
+    return getpagesize();
+}
+
+static INLINE size_t AlignToPageSize(size_t sz)
+{
+    U32 page_size = platform_page_size();
+    size_t aligned_sz = AlignUpPow2(sz, page_size);
+
+    return aligned_sz;
+}
+
+static INLINE size_t AlignToPageStart(size_t sz)
+{
+    U32 page_size = platform_page_size();
+    size_t aligned_sz = AlignDownPow2(sz, page_size);
+
+    return aligned_sz;
+}
+
 void *platform_malloc(size_t sz)
 {
     return malloc(sz);
@@ -16,10 +39,13 @@ void platform_free(void *mem)
 
 void *memory_allocate(size_t sz)
 {
-    int page_size = getpagesize();
-    size_t aligned_sz = AlignUpPow2(sz, page_size);
+    if (sz == 0) {
+        sz = 1;
+    }
 
+    size_t aligned_sz = AlignToPageSize(sz);
     void *mem = mmap(0, aligned_sz, PROT_READ | PROT_WRITE, MAP_ANONYMOUS  | MAP_PRIVATE, -1, 0);
+    TRACEF("memory_allocate size=%zu aligned_size=%zu mem=%p\n", sz, aligned_sz, mem);
     if (mem == MAP_FAILED) {
         mem = NULL;
     }
@@ -28,10 +54,36 @@ void *memory_allocate(size_t sz)
 
 void memory_free(void *mem, size_t sz)
 {
-    int page_size = getpagesize();
-    size_t aligned_sz = AlignUpPow2(sz, page_size);
+    size_t aligned_sz = AlignToPageSize(sz);
+    TRACEF("        memory_free     size=%zu aligned_size=%zu mem=%p\n", sz, aligned_sz, mem);
 
     int rc = munmap(mem, aligned_sz);
 
     Assert(rc == 0);
 }
+
+void memory_commit(void *mem, size_t sz)
+{
+    size_t aligned_sz = AlignToPageSize(sz);
+    void *aligned_mem = (void *)AlignToPageStart((uintptr_t)mem);
+    TRACEF("memory_commit size=%zu aligned_size=%zu ptr=%p aligned_mem=%p\n", sz, aligned_sz, mem, aligned_mem);
+
+    int rc;
+    rc = mprotect(aligned_mem, aligned_sz, PROT_READ | PROT_WRITE);
+    Assert(rc == 0);
+    rc = madvise(aligned_mem, aligned_sz, MADV_WILLNEED);
+    Assert(rc == 0);
+}
+
+void memory_decommit(void *mem, size_t sz)
+{
+    size_t aligned_sz = AlignToPageSize(sz);
+    void *aligned_mem = (void *)AlignToPageStart((uintptr_t)mem);
+    TRACEF("memory_commit size=%zu aligned_size=%zu ptr=%p aligned_mem=%p\n", sz, aligned_sz, mem, aligned_mem);
+
+    int rc;
+    rc = mprotect(aligned_mem, aligned_sz, PROT_NONE);
+    Assert(rc == 0);
+    rc = madvise(aligned_mem, aligned_sz, MADV_DONTNEED);
+    Assert(rc == 0);
+}