[Qemu-devel] Help initializing a hw module

["Juan Antonio Moya Vicén" <juan@securiforest.com>]

Hi list,
I'm new to qemu, and developing a new hw module. And I'll appreciate any
help or link any of you can provide relating to the following problem
I'm experiencing, that I'm certain it is because of inexperience:


I'm getting ENODEV error codes each time I load the kernel module for my
specific device.

** I have a guest OS Linux. The hw I'm emulating is a stupid device,
whose kernel module tries to find at a certain IO mem position: 0xFED40000
The code in the kernel module that makes the call:
         ioremap(0xFED40000, 0x5000);
         if(ioread8(0xFED40000) == 0)
            return -ENODEV;

** My device initialization code in qemu:

static uint32_t my_access_read(void* opaque, target_phys_addr_t addr) {
    return (uint32_t) 0xFF;
}
static CPUReadMemoryFunc* const my_access_read_str[3] = {
my_access_read, NULL, NULL };

void my_register_function(void) {
        int addr = cpu_register_io_memory(my_access_read_str, NULL, s);
        cpu_register_physical_memory(0xFED40000, 0x5000, addr);
}


** I do know that Qemu is calling and executing "my_register_function()"
** I do know that the guest OS kernel module is executing the two lines
I pasted before.

But looks like "my_access_read()" function gets never called. Do you
guys have any idea how to fix this mess?
Thanks in advance


-- 


*Juan Antonio Moya*

Scientific Developer, Securiforest
Sant Joan de La Salle 42, 4th floor
08022 Barcelona (Spain)
Email: juan@securiforest.com <mailto:juan@securiforest.com>
Web:   http://www.securiforest.com
        


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