myvtm/Framework/spbase/sp_shm.c

#include "precompile.h"
#include "sp_shm.h"
#include "sp_def.h"
#include "toolkit.h"
#include "shm_mem.h"
#include <winpr/file.h>
#include <winpr/memory.h>

#define TAG SPBASE_TAG("shm")

#define MEM_KEY		95555
#define MEM_SIZE	(SHM_MEM_SIZE * 1024 * 1024)

#if defined(_MSC_VER)
//0x10000000, 0x20000000, ..., 0x80000000
#define GET_ADDRESS(x) ((void*)((1+(x)) << 28))
#else
//#define GET_ADDRESS(x) ((void*)((1+(x)) << 28))
#define GET_ADDRESS(x) ((void*)(((long)((1+(x))) << 40)))
#endif //_MSC_VER

static int g_newcreator = -1;

int sp_shm_get_range(int mask)
{
	int i;
	int range = 0;
	/*if start to refactor, you can think about :
	 * https://forums.pcsx2.net/Thread-blog-VirtualAlloc-on-Linux
	 * VirtualAlloc has been implement at WinPR
	 */
	for (i = 0; i < 7; ++i) {
		void *address = GET_ADDRESS(i);
#if defined(_MSC_VER)
		void* ret_address = VirtualAlloc(address, MEM_SIZE, MEM_RESERVE, PAGE_NOACCESS);
#else
		void* ret_address = VirtualAlloc(address, MEM_SIZE, MEM_RESERVE, 0);
#endif //_MSC_VER
		if (address == ret_address) {
			range |= 1 << (i + 1);
		} else {
			WLog_WARN(TAG, "%s::address[%d]: %p vs %p", __FUNCTION__, i, address, ret_address);
		}
		if (ret_address)
#if _WIN32
			VirtualFree(ret_address, 0, MEM_RELEASE);
#else
			VirtualFree(ret_address, MEM_SIZE, MEM_RELEASE);
#endif
	}
	WLog_WARN(TAG, "%s::range: %d 0x%x", __FUNCTION__, range, range);
	return range & mask;
}

void *sp_shm_init(int range, int newcreator)
{
	int i, res;
	void *address;
#if !defined(NO_FIXED_ADDR)
    if (newcreator || (res = shm_getmem_addr(&address) == TOOLKIT_ESRCH)) {
        for (i = 0; i < 7; ++i) {
            if (range & (1 << (i + 1))) {
                address = GET_ADDRESS(i);
                WLog_DBG(TAG, "the address[%d] %p mem...", i, address);
                if (shm_mem_init2(MEM_KEY, address, newcreator) == 0) {
                    if (address != NULL) {
                        g_newcreator = newcreator;
                    } else {
                        WLog_WARN(TAG, "the address[%d] is null, but back succ.", i);
                    }
                    return address;
                } else {
                    WLog_DBG(TAG, "the address[%d] %p mem init failed.", i, address);
                }
            }
        }
	} else if(res == 0) {
		WLog_DBG(TAG, "specified address %p mem...", address);
        address = shm_mem_init(address, newcreator);
        if (address != 0) {
            g_newcreator = newcreator;
            return address;
        } else {
            WLog_DBG(TAG, "the address %p mem init failed.", address);
        }
	}
#else
	address = 0x10000000000; //NULL; 0x1000000000000; //0x10000000000 ;
	address = shm_mem_init(address, newcreator);
    if (address != 0) {
		g_newcreator = newcreator;
        return address;
    } else {
        WLog_DBG(TAG, "the address[%d] %p mem init failed.", i, address);
    }
#endif

	return NULL;
}

void sp_shm_term()
{
	/*we don't know why, this has been annotated at windows platform*/
	shm_mem_destroy2(sp_shm_is_newalloc());
	//if(sp_shm_is_newalloc())
	//	shm_mem_destroy();
}

int sp_shm_is_newalloc()
{
	if (g_newcreator == -1)
		return 0;
	return g_newcreator;
}