tests/libqos/malloc-pc.c

   1 /*
   2  * libqos malloc support for PC
   3  *
   4  * Copyright IBM, Corp. 2012-2013
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "libqos/malloc-pc.h"
  14 #include "libqos/fw_cfg.h"
  15
  16 #define NO_QEMU_PROTOS
  17 #include "hw/nvram/fw_cfg.h"
  18
  19 #include "qemu-common.h"
  20 #include <glib.h>
  21
  22 #define PAGE_SIZE (4096)
  23
  24 typedef struct PCAlloc
  25 {
  26     QGuestAllocator alloc;
  27
  28     uint64_t start;
  29     uint64_t end;
  30 } PCAlloc;
  31
  32 static uint64_t pc_alloc(QGuestAllocator *allocator, size_t size)
  33 {
  34     PCAlloc *s = container_of(allocator, PCAlloc, alloc);
  35     uint64_t addr;
  36
  37
  38     size += (PAGE_SIZE - 1);
  39     size &= PAGE_SIZE;
  40
  41     g_assert_cmpint((s->start + size), <=, s->end);
  42
  43     addr = s->start;
  44     s->start += size;
  45
  46     return addr;
  47 }
  48
  49 static void pc_free(QGuestAllocator *allocator, uint64_t addr)
  50 {
  51 }
  52
  53 QGuestAllocator *pc_alloc_init(void)
  54 {
  55     PCAlloc *s = g_malloc0(sizeof(*s));
  56     uint64_t ram_size;
  57     QFWCFG *fw_cfg = pc_fw_cfg_init();
  58
  59     s->alloc.alloc = pc_alloc;
  60     s->alloc.free = pc_free;
  61
  62     ram_size = qfw_cfg_get_u64(fw_cfg, FW_CFG_RAM_SIZE);
  63
  64     /* Start at 1MB */
  65     s->start = 1 << 20;
  66
  67     /* Respect PCI hole */
  68     s->end = MIN(ram_size, 0xE0000000);
  69
  70     return &s->alloc;
  71 }