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Newbie at Linux Kernel programming!


 
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Operating Systems Linux Fedora Newbie at Linux Kernel programming!
# 8  
Old 08-29-2009
From what you are planning to do it matters little. The important consideration is to have coverage of drivers for your hardware and newer versions mostly have a higher degree of driver support.

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Test Your Knowledge in Computers #106
Difficulty: Easy
A kernel is at the heart of the Linux OS; and this kernel acts as an interface between the user and underlying hardware.
True or False?

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id32_alloc(9F)						   Kernel Functions for Drivers 					    id32_alloc(9F)

NAME
id32_alloc, id32_free, id32_lookup - 32-bit driver ID management routines SYNOPSIS
#include <sys/ddi.h> #include <sys/id32.h> uint32_t id32_alloc(void *ptr, int flag); void id32_free(uint32_t token); void *id32_lookup(uint32_t token); INTERFACE LEVEL
Solaris architecture specific (Solaris DDI). PARAMETERS
ptr any valid 32- or 64-bit pointer flag determines whether caller can sleep for memory (see kmem_alloc(9F) for a description) DESCRIPTION
These routines were originally developed so that device drivers could manage 64-bit pointers on devices that save space only for 32-bit pointers. Many device drivers need to pass a 32-bit value to the hardware when attempting I/O. Later, when that I/O completes, the only way the driver has to identify the request that generated that I/O is via a "token". When the I/O is initiated, the driver passes this token to the hardware. When the I/O completes the hardware passes back this 32-bit token. Before Solaris supported 64-bit pointers, device drivers just passed a raw 32-bit pointer to the hardware. When pointers grew to be 64 bits this was no longer possible. The id32_*() routines were created to help drivers translate between 64-bit pointers and a 32-bit token. Given a 32- or 64-bit pointer, the routine id32_alloc() allocates a 32-bit token, returning 0 if KM_NOSLEEP was specified and memory could not be allocated. The allocated token is passed back to id32_lookup() to obtain the original 32- or 64-bit pointer. The routine id32_free() is used to free an allocated token. Once id32_free() is called, the supplied token is no longer valid. Note that these routines have some degree of error checking. This is done so that an invalid token passed to id32_lookup() will not be accepted as valid. When id32_lookup() detects an invalid token it returns NULL. Calling routines should check for this return value so that they do not try to dereference a NULL pointer. CONTEXT
These functions can be called from user or interrupt context. The routine id32_alloc() should not be called from interrupt context when the KM_SLEEP flag is passed in. All other routines can be called from interrupt or kernel context. SEE ALSO
kmem_alloc(9F) Writing Device Drivers SunOS 5.10 12 Dec 2001 id32_alloc(9F)

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