[okl4-developer] vlcd - virtual_lcd_set_fb_impl() - problem with memsection_virt_to_phys() in OKL4-2.1.x

[Gabi Voiculescu]

Hello again.

Do you have an example on how to use the vlcd server with an example application for OKL4.2.1.0 or more recent?  

Is there an updated iguana lcd example for OKL4 2.1.x?

Can you tell me the proper way to add enough capabilities to vlcd so as to make memsection_virt_to_phys() work in my case?

I am interested in a model on how to program capabilities per protected domain to make the framebuffer memsection shared between my iguana example and the vlcd server.

I created an example starting from your document:
http://wiki.ok-labs.com/DriverFramework?action=AttachFile&do=view&target=OKL4-Tutorial-UsingVirtualDevice.pdf

I use project=iguana example=lcd. 

I have added 
env.required_vdevs["lcd_example"] = (["vlcd"])
in the example SConstruct.

My problem: memsection_virt_to_phys() from virtual_lcd_set_fb_impl() fails with error -2 (the vlcd server has no access permission for the memory section created within my iguana user level example).

Below I depict my source code.


Thank you,
Gabi Voiculescu
Newgate Design

My iguana example level init_fb function:

static int
init_fb(struct ig_fb * fb, struct ig_lcd * lcd)
{
    struct lcd_control_block *ctrl = lcd->control;
    fb->size = ctrl->xres * ctrl->yres * ctrl->bpp / 8;
     // size of fb in bytes

    fb->ms = memsection_create_dma ( fb->size,
                                     &fb->vbase,
                                     &fb->pm,                                     
                                     L4_WriteThroughMemory );

    
    printf("[%s] pd_attach result %d, L4_FullyAccessible %d\n", __func__, pd_attach(pd_myself(), fb->ms, L4_FullyAccessible) , L4_FullyAccessible);

    uintptr_t pbase, psize;
    physmem_info(fb->pm, &pbase, &psize);

printf("[%s] Addressing info: size=0x%x vbase=0x%x pbase=0x%x psize=0x%x\n", __func__, fb->size, (int) fb->vbase, (int) pbase, (int) psize);  //FIXME: remove. -gabi virtual <-> phisical mapping verified via kdb ptab

    virtual_lcd_set_fb(lcd->server, lcd->handle, fb->vbase, NULL);

    return 0;
}

And my modifications to the vlcd server virtual_lcd_set_fb function (I tried to attach the memsection to vlcd, as well):

int
virtual_lcd_set_fb_impl
(
    CORBA_Object    _caller,        /* AUTO */
    device_t        handle,
    uintptr_t       new_vaddr,
    idl4_server_environment *_env   /* AUTO */
)
{
    ......
    uintptr_t   old_size;
    size_t      new_size;
    uintptr_t   dummy;
    uintptr_t   new_paddr;
    thread_ref_t server;

    dDEBUG_PRINT("%s [vlcd]: vaddr = 0x%lx\n", __func__, new_vaddr);

  
    dDEBUG_PRINT("%s pd_attach = %d\n", __func__, pd_attach(pd_myself(), memsection_lookup(new_vaddr, &server)/*fb memsection*/, L4_Readable)); //-gabi FIXME: fails with error -1
    /* See if given vaddr is really backed, and get its size */
    new_paddr = memsection_virt_to_phys(new_vaddr, &new_size); //-gabi: FIXME: fails with error code -2
    dDEBUG_PRINT("%s [vlcd]: paddr = 0x%lx(%ld), vaddr=0x%lx\n", __func__, new_paddr, new_paddr, new_vaddr); //-gabi
.......
}





      
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