8a0743cf74
This is a very simple allocator for the PC platform. It should be possible to add backends for other platforms. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Message-id: 1366123521-4330-5-git-send-email-aliguori@us.ibm.com
72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
/*
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* libqos malloc support for PC
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*
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* Copyright IBM, Corp. 2012-2013
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "libqos/malloc-pc.h"
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#include "libqos/fw_cfg-pc.h"
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#define NO_QEMU_PROTOS
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#include "hw/nvram/fw_cfg.h"
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#include "qemu-common.h"
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#include <glib.h>
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#define PAGE_SIZE (4096)
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typedef struct PCAlloc
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{
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QGuestAllocator alloc;
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uint64_t start;
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uint64_t end;
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} PCAlloc;
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static uint64_t pc_alloc(QGuestAllocator *allocator, size_t size)
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{
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PCAlloc *s = container_of(allocator, PCAlloc, alloc);
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uint64_t addr;
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size += (PAGE_SIZE - 1);
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size &= PAGE_SIZE;
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g_assert_cmpint((s->start + size), <=, s->end);
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addr = s->start;
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s->start += size;
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return addr;
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}
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static void pc_free(QGuestAllocator *allocator, uint64_t addr)
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{
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}
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QGuestAllocator *pc_alloc_init(void)
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{
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PCAlloc *s = g_malloc0(sizeof(*s));
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uint64_t ram_size;
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QFWCFG *fw_cfg = pc_fw_cfg_init();
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s->alloc.alloc = pc_alloc;
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s->alloc.free = pc_free;
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ram_size = qfw_cfg_get_u64(fw_cfg, FW_CFG_RAM_SIZE);
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/* Start at 1MB */
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s->start = 1 << 20;
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/* Respect PCI hole */
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s->end = MIN(ram_size, 0xE0000000);
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return &s->alloc;
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}
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