pcibios.c File Reference

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

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

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static void	pcibios_discover (uint32_t busdevfn __unused, struct pci_range *range)
	Find next PCI bus:dev.fn address range in system. More...
int	pcibios_read (struct pci_device *pci, uint32_t command, uint32_t *value)
	Read configuration space via PCI BIOS. More...
int	pcibios_write (struct pci_device *pci, uint32_t command, uint32_t value)
	Write configuration space via PCI BIOS. More...
	PROVIDE_PCIAPI (pcbios, pci_discover, pcibios_discover)
	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)
	PROVIDE_PCIAPI_INLINE (pcbios, pci_ioremap)

Variables
struct pci_api	pcibios_api = PCIAPI_RUNTIME ( pcbios )

Detailed Description

PCI configuration space access via PCI BIOS.

Definition in file pcibios.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

pcibios_discover()

static void pcibios_discover ( uint32_t busdevfn  __unused, struct pci_range *  range  )

static

Find next PCI bus:dev.fn address range in system.

Parameters

busdevfn	Starting PCI bus:dev.fn address
range	PCI bus:dev.fn address range to fill in

Definition at line 42 of file pcibios.c.

                                                         {
        int discard_a, discard_D;
        uint16_t num_bus;

        /* We issue this call using flat real mode, to work around a
         * bug in some HP BIOSes.
         */
        __asm__ __volatile__ ( REAL_CODE ( "call flatten_real_mode\n\t"
                                           "stc\n\t"
                                           "int $0x1a\n\t"
                                           "movzbw %%cl, %%cx\n\t"
                                           "incw %%cx\n\t"
                                           "jnc 1f\n\t"
                                           "xorw %%cx, %%cx\n\t"
                                           "\n1:\n\t" )
                               : "=c" ( num_bus ), "=a" ( discard_a ),
                                 "=D" ( discard_D )
                               : "a" ( PCIBIOS_INSTALLATION_CHECK >> 16 ),
                                 "D" ( 0 )
                               : "ebx", "edx" );

        /* Populate range */
        range->start = PCI_BUSDEVFN ( 0, 0, 0, 0 );
        range->count = PCI_BUSDEVFN ( 0, num_bus, 0, 0 );
}

References __asm__(), __volatile__(), pci_range::count, discard_D, PCI_BUSDEVFN, PCIBIOS_INSTALLATION_CHECK, range, REAL_CODE, and pci_range::start.

pcibios_read()

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 77 of file pcibios.c.

                                                                              {
        int discard_b, discard_D;
        uint16_t 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 )
                               : "edx" );

        return ( status >> 8 );
}

References __asm__(), __volatile__(), pci_device::busdevfn, discard_D, REAL_CODE, status, and value.

pcibios_write()

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 105 of file pcibios.c.

                                                                              {
        int discard_b, discard_c, discard_D;
        uint16_t 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 ), "c" ( value )
                               : "edx" );
        
        return ( status >> 8 );
}

References __asm__(), __volatile__(), pci_device::busdevfn, discard_c, discard_D, REAL_CODE, status, and value.

PROVIDE_PCIAPI()

PROVIDE_PCIAPI	(	pcbios	,
		pci_discover	,
		pcibios_discover
	)

PROVIDE_PCIAPI_INLINE() [1/7]

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_read_config_byte
	)

PROVIDE_PCIAPI_INLINE() [2/7]

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_read_config_word
	)

PROVIDE_PCIAPI_INLINE() [3/7]

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_read_config_dword
	)

PROVIDE_PCIAPI_INLINE() [4/7]

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_write_config_byte
	)

PROVIDE_PCIAPI_INLINE() [5/7]

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_write_config_word
	)

PROVIDE_PCIAPI_INLINE() [6/7]

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_write_config_dword
	)

PROVIDE_PCIAPI_INLINE() [7/7]

PROVIDE_PCIAPI_INLINE	(	pcbios	,
		pci_ioremap
	)

Variable Documentation

pcibios_api

struct pci_api pcibios_api = PCIAPI_RUNTIME ( pcbios )

Definition at line 132 of file pcibios.c.

Referenced by pcicloud_init().