diff options
Diffstat (limited to 'hw/nvram')
| -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 91829d4e4b..73b0a813a7 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, |