diff options
| -rw-r--r-- | cpu-common.h | 8 | ||||
| -rw-r--r-- | exec.c | 123 |
2 files changed, 128 insertions, 3 deletions
diff --git a/cpu-common.h b/cpu-common.h index bb6b137e16..6d4a898ad1 100644 --- a/cpu-common.h +++ b/cpu-common.h @@ -20,6 +20,12 @@ #if !defined(CONFIG_USER_ONLY) +enum device_endian { + DEVICE_NATIVE_ENDIAN, + DEVICE_BIG_ENDIAN, + DEVICE_LITTLE_ENDIAN, +}; + /* address in the RAM (different from a physical address) */ typedef unsigned long ram_addr_t; @@ -55,7 +61,7 @@ ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr); int cpu_register_io_memory(CPUReadMemoryFunc * const *mem_read, CPUWriteMemoryFunc * const *mem_write, - void *opaque); + void *opaque, enum device_endian endian); void cpu_unregister_io_memory(int table_address); void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf, diff --git a/exec.c b/exec.c index 42a35e00f9..af1e89d4fd 100644 --- a/exec.c +++ b/exec.c @@ -3355,6 +3355,106 @@ static int get_free_io_mem_idx(void) return -1; } +/* + * Usually, devices operate in little endian mode. There are devices out + * there that operate in big endian too. Each device gets byte swapped + * mmio if plugged onto a CPU that does the other endianness. + * + * CPU Device swap? + * + * little little no + * little big yes + * big little yes + * big big no + */ + +typedef struct SwapEndianContainer { + CPUReadMemoryFunc *read[3]; + CPUWriteMemoryFunc *write[3]; + void *opaque; +} SwapEndianContainer; + +static uint32_t swapendian_mem_readb (void *opaque, target_phys_addr_t addr) +{ + uint32_t val; + SwapEndianContainer *c = opaque; + val = c->read[0](c->opaque, addr); + return val; +} + +static uint32_t swapendian_mem_readw(void *opaque, target_phys_addr_t addr) +{ + uint32_t val; + SwapEndianContainer *c = opaque; + val = bswap16(c->read[1](c->opaque, addr)); + return val; +} + +static uint32_t swapendian_mem_readl(void *opaque, target_phys_addr_t addr) +{ + uint32_t val; + SwapEndianContainer *c = opaque; + val = bswap32(c->read[2](c->opaque, addr)); + return val; +} + +static CPUReadMemoryFunc * const swapendian_readfn[3]={ + swapendian_mem_readb, + swapendian_mem_readw, + swapendian_mem_readl +}; + +static void swapendian_mem_writeb(void *opaque, target_phys_addr_t addr, + uint32_t val) +{ + SwapEndianContainer *c = opaque; + c->write[0](c->opaque, addr, val); +} + +static void swapendian_mem_writew(void *opaque, target_phys_addr_t addr, + uint32_t val) +{ + SwapEndianContainer *c = opaque; + c->write[1](c->opaque, addr, bswap16(val)); +} + +static void swapendian_mem_writel(void *opaque, target_phys_addr_t addr, + uint32_t val) +{ + SwapEndianContainer *c = opaque; + c->write[2](c->opaque, addr, bswap32(val)); +} + +static CPUWriteMemoryFunc * const swapendian_writefn[3]={ + swapendian_mem_writeb, + swapendian_mem_writew, + swapendian_mem_writel +}; + +static void swapendian_init(int io_index) +{ + SwapEndianContainer *c = qemu_malloc(sizeof(SwapEndianContainer)); + int i; + + /* Swap mmio for big endian targets */ + c->opaque = io_mem_opaque[io_index]; + for (i = 0; i < 3; i++) { + c->read[i] = io_mem_read[io_index][i]; + c->write[i] = io_mem_write[io_index][i]; + + io_mem_read[io_index][i] = swapendian_readfn[i]; + io_mem_write[io_index][i] = swapendian_writefn[i]; + } + io_mem_opaque[io_index] = c; +} + +static void swapendian_del(int io_index) +{ + if (io_mem_read[io_index][0] == swapendian_readfn[0]) { + qemu_free(io_mem_opaque[io_index]); + } +} + /* mem_read and mem_write are arrays of functions containing the function to access byte (index 0), word (index 1) and dword (index 2). Functions can be omitted with a NULL function pointer. @@ -3365,9 +3465,10 @@ static int get_free_io_mem_idx(void) static int cpu_register_io_memory_fixed(int io_index, CPUReadMemoryFunc * const *mem_read, CPUWriteMemoryFunc * const *mem_write, - void *opaque) + void *opaque, enum device_endian endian) { int i; + int endian = DEVICE_NATIVE_ENDIAN; if (io_index <= 0) { io_index = get_free_io_mem_idx(); @@ -3389,12 +3490,28 @@ static int cpu_register_io_memory_fixed(int io_index, } io_mem_opaque[io_index] = opaque; + switch (endian) { + case DEVICE_BIG_ENDIAN: +#ifndef TARGET_WORDS_BIGENDIAN + swapendian_init(io_index); +#endif + break; + case DEVICE_LITTLE_ENDIAN: +#ifdef TARGET_WORDS_BIGENDIAN + swapendian_init(io_index); +#endif + break; + case DEVICE_NATIVE_ENDIAN: + default: + break; + } + return (io_index << IO_MEM_SHIFT); } int cpu_register_io_memory(CPUReadMemoryFunc * const *mem_read, CPUWriteMemoryFunc * const *mem_write, - void *opaque) + void *opaque, enum device_endian endian) { return cpu_register_io_memory_fixed(0, mem_read, mem_write, opaque); } @@ -3404,6 +3521,8 @@ void cpu_unregister_io_memory(int io_table_address) int i; int io_index = io_table_address >> IO_MEM_SHIFT; + swapendian_del(io_index); + for (i=0;i < 3; i++) { io_mem_read[io_index][i] = unassigned_mem_read[i]; io_mem_write[io_index][i] = unassigned_mem_write[i]; |