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| author | Kevin O'Connor <kevin@koconnor.net> | 2015-10-08 17:02:58 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2015-10-19 15:26:54 +0200 |
| commit | 2cc06a8843ace3d03464032eb3c74bc6e2b07579 (patch) | |
| tree | a26f32b3b9cdf3aaf3080e61c561be64ee26bf4d /hw | |
| parent | c886fc4c20ff8456b2f788a1404dd321b8b59243 (diff) | |
| download | qemu-2cc06a8843ace3d03464032eb3c74bc6e2b07579.zip qemu-2cc06a8843ace3d03464032eb3c74bc6e2b07579.tar.gz qemu-2cc06a8843ace3d03464032eb3c74bc6e2b07579.tar.bz2 | |
fw_cfg: Define a static signature to be returned on DMA port reads
Return a static signature ("QEMU CFG") if the guest does a read to the
DMA address io register.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/nvram/fw_cfg.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c index 91829d4..73b0a81 100644 --- a/hw/nvram/fw_cfg.c +++ b/hw/nvram/fw_cfg.c @@ -53,6 +53,8 @@ #define FW_CFG_DMA_CTL_SKIP 0x04 #define FW_CFG_DMA_CTL_SELECT 0x08 +#define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */ + typedef struct FWCfgEntry { uint32_t len; uint8_t *data; @@ -397,6 +399,13 @@ static void fw_cfg_dma_transfer(FWCfgState *s) trace_fw_cfg_read(s, 0); } +static uint64_t fw_cfg_dma_mem_read(void *opaque, hwaddr addr, + unsigned size) +{ + /* Return a signature value (and handle various read sizes) */ + return extract64(FW_CFG_DMA_SIGNATURE, (8 - addr - size) * 8, size * 8); +} + static void fw_cfg_dma_mem_write(void *opaque, hwaddr addr, uint64_t value, unsigned size) { @@ -420,8 +429,8 @@ static void fw_cfg_dma_mem_write(void *opaque, hwaddr addr, static bool fw_cfg_dma_mem_valid(void *opaque, hwaddr addr, unsigned size, bool is_write) { - return is_write && ((size == 4 && (addr == 0 || addr == 4)) || - (size == 8 && addr == 0)); + return !is_write || ((size == 4 && (addr == 0 || addr == 4)) || + (size == 8 && addr == 0)); } static bool fw_cfg_data_mem_valid(void *opaque, hwaddr addr, @@ -492,6 +501,7 @@ static const MemoryRegionOps fw_cfg_comb_mem_ops = { }; static const MemoryRegionOps fw_cfg_dma_mem_ops = { + .read = fw_cfg_dma_mem_read, .write = fw_cfg_dma_mem_write, .endianness = DEVICE_BIG_ENDIAN, .valid.accepts = fw_cfg_dma_mem_valid, |