/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
/* Copyright (C) 2014 OSCAR lab, Stony Brook University
This file is part of Graphene Library OS.
Graphene Library OS is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Graphene Library OS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see . */
/*
* db_memory.c
*
* This files contains APIs that allocate, free or protect virtual memory.
*/
#include "pal_defs.h"
#include "pal_linux_defs.h"
#include "pal.h"
#include "pal_internal.h"
#include "pal_linux.h"
#include "pal_security.h"
#include "pal_error.h"
#include "pal_debug.h"
#include "api.h"
#include
#include "enclave_pages.h"
#define PAL_VMA_MAX 64
static struct pal_vma {
void * top, * bottom;
} pal_vmas[PAL_VMA_MAX];
static unsigned int pal_nvmas = 0;
static struct spinlock pal_vma_lock;
bool _DkCheckMemoryMappable (const void * addr, int size)
{
if (addr < DATA_END && addr + size > TEXT_START) {
printf("address %p-%p is not mappable\n", addr, addr + size);
return true;
}
_DkSpinLock(&pal_vma_lock);
for (int i = 0 ; i < pal_nvmas ; i++)
if (addr < pal_vmas[i].top && addr + size > pal_vmas[i].bottom) {
printf("address %p-%p is not mappable\n", addr, addr + size);
_DkSpinUnlock(&pal_vma_lock);
return true;
}
_DkSpinUnlock(&pal_vma_lock);
return false;
}
int _DkVirtualMemoryAlloc (void ** paddr, int size, int alloc_type, int prot)
{
void * addr = *paddr, * mem;
//int flags = HOST_FLAGS(alloc_type, prot|PAL_PROT_WRITECOPY);
//prot = HOST_PROT(prot);
/* The memory should have MAP_PRIVATE and MAP_ANONYMOUS */
//flags |= MAP_ANONYMOUS|(addr ? MAP_FIXED : 0);
//mem = (void *) ARCH_MMAP(addr, size, prot, flags, -1, 0);
if ((alloc_type & PAL_ALLOC_INTERNAL) && addr)
return -PAL_ERROR_INVAL;
if (size == 0)
asm volatile ("int $3");
mem = get_reserved_pages(addr, size);
if (!mem)
return addr ? -PAL_ERROR_DENIED : -PAL_ERROR_NOMEM;
memset(mem, 0, size);
if (alloc_type & PAL_ALLOC_INTERNAL) {
SGX_DBG(DBG_M, "pal allocates %p-%p for internal use\n", mem, mem + size);
_DkSpinLock(&pal_vma_lock);
assert(pal_nvmas < PAL_VMA_MAX);
pal_vmas[pal_nvmas].bottom = mem;
pal_vmas[pal_nvmas].top = mem + size;
pal_nvmas++;
_DkSpinUnlock(&pal_vma_lock);
}
*paddr = mem;
return 0;
}
int _DkVirtualMemoryFree (void * addr, int size)
{
free_pages(addr, size);
return 0;
}
int _DkVirtualMemoryProtect (void * addr, int size, int prot)
{
return 0;
}
unsigned long _DkMemoryQuota (void)
{
return pal_sec.heap_max - pal_sec.heap_min;
}
extern struct atomic_int alloced_pages;
extern unsigned int pagesz;
unsigned long _DkMemoryAvailableQuota (void)
{
return (pal_sec.heap_max - pal_sec.heap_min) -
atomic_read(&alloced_pages) * pagesz;
}