PCI bus enumeration and /sys/bus/pci/devices/ stub sysfs population. More...

#include <miniOS/drivers/pci.h>
#include <miniOS/arch/x86_64/port.h>
#include <miniOS/drivers/console.h>
#include <miniOS/fs/sysfs.h>
#include <miniOS/io.h>
#include <string.h>

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Functions
uint32_t	pci_config_read32 (uint8_t bus, uint8_t dev, uint8_t fn, uint8_t off)
void	pci_config_write32 (uint8_t bus, uint8_t dev, uint8_t fn, uint8_t off, uint32_t val)
static char	hex_nibble (uint8_t n)
static void	hex8 (char *out, uint8_t val)
static void	hex16 (char *out, uint16_t val)
static void	hex32 (char *out, uint32_t val)
static void	pci_write_attr16 (sysfs_node_t dir, const char name, uint16_t val)
static void	pci_write_attr32 (sysfs_node_t dir, const char name, uint32_t val)
static void	pci_write_class (sysfs_node_t *dir, uint8_t class_code, uint8_t subclass)
static void	pci_write_dec (sysfs_node_t dir, const char name, uint8_t val)
static void	pci_populate_sysfs (void)
void	pci_init (void)

Variables
pci_device_t	pci_devices [PCI_MAX_DEVICES]
int	pci_device_count = 0

Detailed Description

PCI bus enumeration and /sys/bus/pci/devices/ stub sysfs population.

Implements pci_init() which scans PCI bus 0, fills the global pci_devices[] array, and creates a static /sys directory tree populated at boot. Also provides the shared pci_config_read32()/pci_config_write32() helpers that replace the duplicates previously in ata.c.

Function Documentation

◆ hex16()

void hex16	(	char *	out,
		uint16_t	val )

static

hex16() - Write a 4-character hex representation of val into out[0..3]. Does NOT null-terminate.

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◆ hex32()

void hex32	(	char *	out,
		uint32_t	val )

static

hex32() - Write an 8-character hex representation of val into out[0..7]. Does NOT null-terminate.

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◆ hex8()

void hex8	(	char *	out,
		uint8_t	val )

static

hex8() - Write a 2-character hex representation of val into out[0..1]. Does NOT null-terminate.

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◆ hex_nibble()

char hex_nibble ( uint8_t n )

static

hex_nibble() - Convert a 4-bit nibble to its ASCII hex character.

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◆ pci_config_read32()

uint32_t pci_config_read32	(	uint8_t	bus,
		uint8_t	dev,
		uint8_t	fn,
		uint8_t	off )

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◆ pci_config_write32()

void pci_config_write32	(	uint8_t	bus,
		uint8_t	dev,
		uint8_t	fn,
		uint8_t	off,
		uint32_t	val )

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◆ pci_init()

void pci_init ( void )

pci_init() - Enumerate PCI bus 0 and populate /sys/bus/pci/devices/.

Scans all 32 device slots on bus 0. For multi-function devices (header type bit 7 set), iterates functions 0-7; single-function devices use only fn 0. Each discovered function is stored in pci_devices[pci_device_count++]. Capped at PCI_MAX_DEVICES.

pci_init() - Enumerate PCI bus 0 and populate /sys/bus/pci/devices/.

Scans bus 0, slots 0-31, respecting the multi-function bit. Fills pci_devices[] with every non-empty function. Prints the device count via printk(). Then creates /sys/bus/pci/devices/<domain>:<bus>:<dev>.<fn>/ directories with vendor, device, class, subsystem_vendor, subsystem_device attribute files.

Must be called after sysfs_init() and before ata_init().

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◆ pci_populate_sysfs()

void pci_populate_sysfs ( void )

static

pci_populate_sysfs() - Build /sys/bus/pci/devices/ using sysfs API.

Creates the directory tree rooted at g_sysfs_root and populates per-device attribute files. Safe to call before ext2 root is mounted since it only touches the in-kernel sysfs node tree.

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