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Strip down i386 PCI configuration space I/O to the bare minimum. A

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typical build will now include 880 bytes of PCI support code, compared to
2327 bytes in Etherboot 5.4.

(There is a slight cost of around 5 extra bytes per access to a
non-constant config space address; this should be an overall win.
Driver-specific accesses will usually be to constant addresses, for
which there is no additional cost.)
This commit is contained in:
Michael Brown
2006-05-17 01:12:11 +00:00
parent 15ee09ed10
commit 6b6096d28b
8 changed files with 435 additions and 493 deletions
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15
src/drivers/bus/pci.c
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@@ -38,15 +38,6 @@ static struct pci_driver pci_drivers_end[0] __table_end ( pci_drivers );
static void pcibus_remove ( struct root_device *rootdev );
/**
* Maximum PCI bus number
*
* Architecture-specific code may know how many buses we have, in
* which case it can overwrite this value.
*
*/
unsigned int pci_max_bus = 0xff;
/**
* Read PCI BAR
*
@@ -242,13 +233,15 @@ static void unregister_pcidev ( struct pci_device *pci ) {
*/
static int pcibus_probe ( struct root_device *rootdev ) {
struct pci_device *pci = NULL;
unsigned int max_bus;
unsigned int bus;
unsigned int devfn;
uint8_t hdrtype;
uint8_t hdrtype = 0;
uint32_t tmp;
int rc;
for ( bus = 0 ; bus <= pci_max_bus ; bus++ ) {
max_bus = pci_max_bus();
for ( bus = 0 ; bus <= max_bus ; bus++ ) {
for ( devfn = 0 ; devfn <= 0xff ; devfn++ ) {
/* Allocate struct pci_device */