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New device probing mechanism

pull/1/head
Michael Brown 2005-04-12 16:38:23 +00:00
parent 707720c4e5
commit 17c1ca90e7
2 changed files with 83 additions and 107 deletions
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44
src/core/dev.c 100644
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@ -0,0 +1,44 @@
#include "etherboot.h"
#include "stddef.h"
#include "dev.h"
/* Defined by linker */
extern struct boot_driver boot_drivers[];
extern struct boot_driver boot_drivers_end[];
/* Current attempted boot driver */
static struct boot_driver *boot_driver = boot_drivers;
/* Current boot device */
struct dev dev;
/* Print all drivers */
void print_drivers ( void ) {
struct boot_driver *driver;
for ( driver = boot_drivers ; driver < boot_drivers_end ; driver++ ) {
printf ( "%s ", driver->name );
}
}
/* Get the next available boot device */
int probe ( struct dev *dev ) {
for ( ; boot_driver < boot_drivers_end ; boot_driver++ ) {
dev->name = "unknown";
if ( boot_driver->probe ( dev ) )
return 1;
}
/* No more boot devices found */
boot_driver = boot_drivers;
return 0;
}
/* Disable a device */
void disable ( struct dev *dev ) {
if ( dev->dev_op ) {
dev->dev_op->disable ( dev );
dev->dev_op = NULL;
}
}

146
src/include/dev.h
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@ -1,126 +1,58 @@
#ifndef DEV_H #ifndef DEV_H
#define DEV_H #define DEV_H
#include "isa.h" #include "stdint.h"
#include "pci.h" #include "nic.h"
/* Need to check the packing of this struct if Etherboot is ported */ /* Need to check the packing of this struct if Etherboot is ported */
struct dev_id struct dev_id {
{ uint16_t vendor_id;
unsigned short vendor_id; uint16_t device_id;
unsigned short device_id; uint8_t bus_type;
unsigned char bus_type;
#define PCI_BUS_TYPE 1 #define PCI_BUS_TYPE 1
#define ISA_BUS_TYPE 2 #define ISA_BUS_TYPE 2
}; } __attribute__ ((packed));
/* Dont use sizeof, that will include the padding */ /* Dont use sizeof, that will include the padding */
#define DEV_ID_SIZE 8 #define DEV_ID_SIZE 8
struct dev {
struct pci_probe_state const char *name;
{
#ifdef CONFIG_PCI
struct pci_device dev;
int advance;
#else
int dummy;
#endif
};
struct isa_probe_state
{
#ifdef CONFIG_ISA
const struct isa_driver *driver;
int advance;
#else
int dummy;
#endif
};
union probe_state
{
struct pci_probe_state pci;
struct isa_probe_state isa;
};
struct dev
{
void (*disable)P((struct dev *));
struct dev_id devid; /* device ID string (sent to DHCP server) */ struct dev_id devid; /* device ID string (sent to DHCP server) */
int index; /* Index of next device on this controller to probe */ struct dev_operations *dev_op;
int type; /* Type of device I am probing for */ /* All possible device types */
int how_probe; /* First, next or awake */ union {
int to_probe; /* Flavor of device I am probing */ struct nic nic;
int failsafe; /* Failsafe probe requested */ };
int type_index; /* Index of this device (within type) */
#define PROBE_NONE 0
#define PROBE_PCI 1
#define PROBE_ISA 2
union probe_state state;
}; };
struct dev_operations {
void ( *disable ) ( struct dev * );
int ( *load_configuration ) ( struct dev * );
int ( *load ) ( struct dev * );
};
#define NIC_DRIVER 0 struct boot_driver {
#define DISK_DRIVER 1 char *name;
#define FLOPPY_DRIVER 2 int (*probe) ( struct dev * );
};
#define BRIDGE_DRIVER 1000 #define BOOT_DRIVER( driver_name, probe_func ) \
static struct boot_driver boot_driver \
__attribute__ ((used,__section__(".boot_drivers"))) = { \
.name = driver_name, \
.probe = probe_func, \
};
#define PROBE_FIRST (-1) /* Functions in dev.c */
#define PROBE_NEXT 0 extern void print_drivers ( void );
#define PROBE_AWAKE 1 /* After calling disable bring up the same device */ extern int probe ( struct dev *dev );
extern void disable ( struct dev *dev );
/* The probe result codes are selected static inline int load_configuration ( struct dev *dev ) {
* to allow them to be fed back into the probe return dev->dev_op->load_configuration ( dev );
* routine and get a successful probe. }
*/ static inline int load ( struct dev *dev ) {
#define PROBE_FAILED PROBE_FIRST return dev->dev_op->load ( dev );
#define PROBE_WORKED PROBE_NEXT }
extern int probe(struct dev *dev);
extern void disable(struct dev *dev);
/* Boot option values
* option & BOOT_TYPE_MASK should equal a driver for probing
*/
#define BOOT_NIC 0x0 /* Boot from a nic */
#define BOOT_DISK 0x1 /* Boot from disk */
#define BOOT_FLOPPY 0x2 /* Boot from a floppy */
#define BOOT_NOTHING 0x3 /* Last valid boot choice */
/* Do magic failsafe boot processing */
#define BOOT_FAILSAFE 0x8
#define BOOT_BITS 4
#define BOOT_MASK ((1 << (BOOT_BITS)) - 1)
#define BOOT_TYPE_MASK ((1 << (BOOT_BITS - 1)) - 1)
#define MAX_BOOT_ENTRIES 3
#define BOOT_ALL_VALUE (1<<BOOT_FIRST|1<<BOOT_SECOND|1<<BOOT_THIRD)
/* These could be customised for different languages perhaps */
#if BOOT_ALL_VALUE&(1<<BOOT_DISK)
#define BOOT_DISK_PROMPT "(D)isk "
#else
#define BOOT_DISK_PROMPT
#endif
#if BOOT_ALL_VALUE&(1<<BOOT_FLOPPY)
#define BOOT_FLOPPY_PROMPT "(F)loppy "
#else
#define BOOT_FLOPPY_PROMPT
#endif
#define ASK_PROMPT \
"Boot from (N)etwork " BOOT_DISK_PROMPT BOOT_FLOPPY_PROMPT "or (Q)uit? "
#define ANS_NETWORK 'N'
#define ANS_DISK 'D'
#define ANS_FLOPPY 'F'
#define ANS_QUIT 'Q'
#define ANS_DEFAULT '\n'
#endif /* DEV_H */ #endif /* DEV_H */