User talk:MrNuke: Difference between revisions
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== Ideas for generic handling of devices == | == Ideas for generic handling of devices == | ||
=== Proposal 1: Unified API === | |||
Chan is an IO channel. | Chan is an IO channel. | ||
This struct is used in Inferno and has been for a long time; so it works. | This struct is used in Inferno and has been for a long time; so it works. | ||
It's also in the opcodes somewhat like what we did for EMMC on ARM. | It's also in the opcodes somewhat like what we did for EMMC on ARM. | ||
struct Dev | struct Dev | ||
| Line 22: | Line 22: | ||
void (*power)(int); /* power mgt: power(1) ? on, power (0) ? off */ | void (*power)(int); /* power mgt: power(1) ? on, power (0) ? off */ | ||
}; | }; | ||
==== Questions ==== | |||
* Do we want to expose or hide the block nature of some devces (i.e. force reading multiples of blocksize, or allow reading any number of bytes, with no alignment requirement) ? | |||
Revision as of 01:24, 11 January 2014
Ideas for generic handling of devices
Proposal 1: Unified API
Chan is an IO channel.
This struct is used in Inferno and has been for a long time; so it works. It's also in the opcodes somewhat like what we did for EMMC on ARM.
struct Dev
{
char* name;
void (*reset)(void);
void (*init)(void);
void (*shutdown)(void);
Chan* (*attach)(char*); /* tell the device you want to use it */
Walkqid* (*walk)(Chan*, Chan*, char**, int); /* walk to a name in the device's managed name space; return a handle */
int (*stat)(Chan*, uchar*, int); // status info
Chan* (*open)(Chan*, int); /* get access to a resource in the device name space */
void (*close)(Chan*); /* tell it you are done with whatever it is. */
long (*read)(Chan*, void*, long, vlong);
long (*write)(Chan*, void*, long, vlong);
void (*power)(int); /* power mgt: power(1) ? on, power (0) ? off */
};
Questions
- Do we want to expose or hide the block nature of some devces (i.e. force reading multiples of blocksize, or allow reading any number of bytes, with no alignment requirement) ?