pcibios.c File Reference

PCI configuration space access via PCI BIOS. More...

#include <stdint.h>
#include <gpxe/pci.h>
#include <realmode.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER)
static int	pcibios_max_bus (void)
	Determine maximum PCI bus number within system.
int	pcibios_read (struct pci_device *pci, uint32_t command, uint32_t *value)
	Read configuration space via PCI BIOS.
int	pcibios_write (struct pci_device *pci, uint32_t command, uint32_t value)
	Write configuration space via PCI BIOS.
	PROVIDE_PCIAPI (pcbios, pci_max_bus, pcibios_max_bus)
	PROVIDE_PCIAPI_INLINE (pcbios, pci_read_config_byte)
	PROVIDE_PCIAPI_INLINE (pcbios, pci_read_config_word)
	PROVIDE_PCIAPI_INLINE (pcbios, pci_read_config_dword)
	PROVIDE_PCIAPI_INLINE (pcbios, pci_write_config_byte)
	PROVIDE_PCIAPI_INLINE (pcbios, pci_write_config_word)
	PROVIDE_PCIAPI_INLINE (pcbios, pci_write_config_dword)

---

Detailed Description

PCI configuration space access via PCI BIOS.

Definition in file pcibios.c.

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

static int pcibios_max_bus

(

void

)

[static]

Determine maximum PCI bus number within system.

Return values:

max_bus

Maximum bus number

Definition at line 36 of file pcibios.c.

References __asm__(), PCIBIOS_INSTALLATION_CHECK, and REAL_CODE.

                                    {
        int discard_a, discard_D;
        uint8_t max_bus;

        __asm__ __volatile__ ( REAL_CODE ( "stc\n\t"
                                           "int $0x1a\n\t"
                                           "jnc 1f\n\t"
                                           "xorw %%cx, %%cx\n\t"
                                           "\n1:\n\t" )
                               : "=c" ( max_bus ), "=a" ( discard_a ),
                                 "=D" ( discard_D )
                               : "a" ( PCIBIOS_INSTALLATION_CHECK >> 16 ),
                                 "D" ( 0 )
                               : "ebx", "edx" );

        return max_bus;
}

int pcibios_read	(	struct pci_device *	pci,
		uint32_t	command,
		uint32_t *	value
	)

Read configuration space via PCI BIOS.

Parameters:

	pci	PCI device
	command	PCI BIOS command
	value	Value read

Return values:

rc

Return status code

Definition at line 62 of file pcibios.c.

References __asm__(), pci_device::bus, pci_device::devfn, PCI_BUSDEVFN, and REAL_CODE.

                                                                              {
        int discard_b, discard_D;
        int status;

        __asm__ __volatile__ ( REAL_CODE ( "stc\n\t"
                                           "int $0x1a\n\t"
                                           "jnc 1f\n\t"
                                           "xorl %%eax, %%eax\n\t"
                                           "decl %%eax\n\t"
                                           "movl %%eax, %%ecx\n\t"
                                           "\n1:\n\t" )
                               : "=a" ( status ), "=b" ( discard_b ),
                                 "=c" ( *value ), "=D" ( discard_D )
                               : "a" ( command >> 16 ), "D" ( command ),
                                 "b" ( PCI_BUSDEVFN ( pci->bus, pci->devfn ) )
                               : "edx" );

        return ( ( status >> 8 ) & 0xff );
}

int pcibios_write	(	struct pci_device *	pci,
		uint32_t	command,
		uint32_t	value
	)

Write configuration space via PCI BIOS.

Parameters:

	pci	PCI device
	command	PCI BIOS command
	value	Value to be written

Return values:

rc

Return status code

Definition at line 90 of file pcibios.c.

References __asm__(), pci_device::bus, pci_device::devfn, PCI_BUSDEVFN, and REAL_CODE.

                                                                              {
        int discard_b, discard_c, discard_D;
        int status;

        __asm__ __volatile__ ( REAL_CODE ( "stc\n\t"
                                           "int $0x1a\n\t"
                                           "jnc 1f\n\t"
                                           "movb $0xff, %%ah\n\t"
                                           "\n1:\n\t" )
                               : "=a" ( status ), "=b" ( discard_b ),
                                 "=c" ( discard_c ), "=D" ( discard_D )
                               : "a" ( command >> 16 ), "D" ( command ),
                                 "b" ( PCI_BUSDEVFN ( pci->bus, pci->devfn ) ),
                                 "c" ( value )
                               : "edx" );
        
        return ( ( status >> 8 ) & 0xff );
}

PROVIDE_PCIAPI	(	pcbios	,
		pci_max_bus	,
		pcibios_max_bus
	)

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_read_config_byte
	)

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_read_config_word
	)

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_read_config_dword
	)

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_write_config_byte
	)

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_write_config_word
	)

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_write_config_dword
	)