summaryrefslogtreecommitdiff
path: root/arch/i386/pci/pcbios.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/i386/pci/pcbios.c')
-rw-r--r--arch/i386/pci/pcbios.c492
1 files changed, 0 insertions, 492 deletions
diff --git a/arch/i386/pci/pcbios.c b/arch/i386/pci/pcbios.c
deleted file mode 100644
index 10ac8c316c46..000000000000
--- a/arch/i386/pci/pcbios.c
+++ /dev/null
@@ -1,492 +0,0 @@
-/*
- * BIOS32 and PCI BIOS handling.
- */
-
-#include <linux/pci.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/uaccess.h>
-#include "pci.h"
-#include "pci-functions.h"
-
-
-/* BIOS32 signature: "_32_" */
-#define BIOS32_SIGNATURE (('_' << 0) + ('3' << 8) + ('2' << 16) + ('_' << 24))
-
-/* PCI signature: "PCI " */
-#define PCI_SIGNATURE (('P' << 0) + ('C' << 8) + ('I' << 16) + (' ' << 24))
-
-/* PCI service signature: "$PCI" */
-#define PCI_SERVICE (('$' << 0) + ('P' << 8) + ('C' << 16) + ('I' << 24))
-
-/* PCI BIOS hardware mechanism flags */
-#define PCIBIOS_HW_TYPE1 0x01
-#define PCIBIOS_HW_TYPE2 0x02
-#define PCIBIOS_HW_TYPE1_SPEC 0x10
-#define PCIBIOS_HW_TYPE2_SPEC 0x20
-
-/*
- * This is the standard structure used to identify the entry point
- * to the BIOS32 Service Directory, as documented in
- * Standard BIOS 32-bit Service Directory Proposal
- * Revision 0.4 May 24, 1993
- * Phoenix Technologies Ltd.
- * Norwood, MA
- * and the PCI BIOS specification.
- */
-
-union bios32 {
- struct {
- unsigned long signature; /* _32_ */
- unsigned long entry; /* 32 bit physical address */
- unsigned char revision; /* Revision level, 0 */
- unsigned char length; /* Length in paragraphs should be 01 */
- unsigned char checksum; /* All bytes must add up to zero */
- unsigned char reserved[5]; /* Must be zero */
- } fields;
- char chars[16];
-};
-
-/*
- * Physical address of the service directory. I don't know if we're
- * allowed to have more than one of these or not, so just in case
- * we'll make pcibios_present() take a memory start parameter and store
- * the array there.
- */
-
-static struct {
- unsigned long address;
- unsigned short segment;
-} bios32_indirect = { 0, __KERNEL_CS };
-
-/*
- * Returns the entry point for the given service, NULL on error
- */
-
-static unsigned long bios32_service(unsigned long service)
-{
- unsigned char return_code; /* %al */
- unsigned long address; /* %ebx */
- unsigned long length; /* %ecx */
- unsigned long entry; /* %edx */
- unsigned long flags;
-
- local_irq_save(flags);
- __asm__("lcall *(%%edi); cld"
- : "=a" (return_code),
- "=b" (address),
- "=c" (length),
- "=d" (entry)
- : "0" (service),
- "1" (0),
- "D" (&bios32_indirect));
- local_irq_restore(flags);
-
- switch (return_code) {
- case 0:
- return address + entry;
- case 0x80: /* Not present */
- printk(KERN_WARNING "bios32_service(0x%lx): not present\n", service);
- return 0;
- default: /* Shouldn't happen */
- printk(KERN_WARNING "bios32_service(0x%lx): returned 0x%x -- BIOS bug!\n",
- service, return_code);
- return 0;
- }
-}
-
-static struct {
- unsigned long address;
- unsigned short segment;
-} pci_indirect = { 0, __KERNEL_CS };
-
-static int pci_bios_present;
-
-static int __devinit check_pcibios(void)
-{
- u32 signature, eax, ebx, ecx;
- u8 status, major_ver, minor_ver, hw_mech;
- unsigned long flags, pcibios_entry;
-
- if ((pcibios_entry = bios32_service(PCI_SERVICE))) {
- pci_indirect.address = pcibios_entry + PAGE_OFFSET;
-
- local_irq_save(flags);
- __asm__(
- "lcall *(%%edi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=d" (signature),
- "=a" (eax),
- "=b" (ebx),
- "=c" (ecx)
- : "1" (PCIBIOS_PCI_BIOS_PRESENT),
- "D" (&pci_indirect)
- : "memory");
- local_irq_restore(flags);
-
- status = (eax >> 8) & 0xff;
- hw_mech = eax & 0xff;
- major_ver = (ebx >> 8) & 0xff;
- minor_ver = ebx & 0xff;
- if (pcibios_last_bus < 0)
- pcibios_last_bus = ecx & 0xff;
- DBG("PCI: BIOS probe returned s=%02x hw=%02x ver=%02x.%02x l=%02x\n",
- status, hw_mech, major_ver, minor_ver, pcibios_last_bus);
- if (status || signature != PCI_SIGNATURE) {
- printk (KERN_ERR "PCI: BIOS BUG #%x[%08x] found\n",
- status, signature);
- return 0;
- }
- printk(KERN_INFO "PCI: PCI BIOS revision %x.%02x entry at 0x%lx, last bus=%d\n",
- major_ver, minor_ver, pcibios_entry, pcibios_last_bus);
-#ifdef CONFIG_PCI_DIRECT
- if (!(hw_mech & PCIBIOS_HW_TYPE1))
- pci_probe &= ~PCI_PROBE_CONF1;
- if (!(hw_mech & PCIBIOS_HW_TYPE2))
- pci_probe &= ~PCI_PROBE_CONF2;
-#endif
- return 1;
- }
- return 0;
-}
-
-static int __devinit pci_bios_find_device (unsigned short vendor, unsigned short device_id,
- unsigned short index, unsigned char *bus, unsigned char *device_fn)
-{
- unsigned short bx;
- unsigned short ret;
-
- __asm__("lcall *(%%edi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=b" (bx),
- "=a" (ret)
- : "1" (PCIBIOS_FIND_PCI_DEVICE),
- "c" (device_id),
- "d" (vendor),
- "S" ((int) index),
- "D" (&pci_indirect));
- *bus = (bx >> 8) & 0xff;
- *device_fn = bx & 0xff;
- return (int) (ret & 0xff00) >> 8;
-}
-
-static int pci_bios_read(unsigned int seg, unsigned int bus,
- unsigned int devfn, int reg, int len, u32 *value)
-{
- unsigned long result = 0;
- unsigned long flags;
- unsigned long bx = (bus << 8) | devfn;
-
- if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
- return -EINVAL;
-
- spin_lock_irqsave(&pci_config_lock, flags);
-
- switch (len) {
- case 1:
- __asm__("lcall *(%%esi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=c" (*value),
- "=a" (result)
- : "1" (PCIBIOS_READ_CONFIG_BYTE),
- "b" (bx),
- "D" ((long)reg),
- "S" (&pci_indirect));
- break;
- case 2:
- __asm__("lcall *(%%esi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=c" (*value),
- "=a" (result)
- : "1" (PCIBIOS_READ_CONFIG_WORD),
- "b" (bx),
- "D" ((long)reg),
- "S" (&pci_indirect));
- break;
- case 4:
- __asm__("lcall *(%%esi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=c" (*value),
- "=a" (result)
- : "1" (PCIBIOS_READ_CONFIG_DWORD),
- "b" (bx),
- "D" ((long)reg),
- "S" (&pci_indirect));
- break;
- }
-
- spin_unlock_irqrestore(&pci_config_lock, flags);
-
- return (int)((result & 0xff00) >> 8);
-}
-
-static int pci_bios_write(unsigned int seg, unsigned int bus,
- unsigned int devfn, int reg, int len, u32 value)
-{
- unsigned long result = 0;
- unsigned long flags;
- unsigned long bx = (bus << 8) | devfn;
-
- if ((bus > 255) || (devfn > 255) || (reg > 255))
- return -EINVAL;
-
- spin_lock_irqsave(&pci_config_lock, flags);
-
- switch (len) {
- case 1:
- __asm__("lcall *(%%esi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=a" (result)
- : "0" (PCIBIOS_WRITE_CONFIG_BYTE),
- "c" (value),
- "b" (bx),
- "D" ((long)reg),
- "S" (&pci_indirect));
- break;
- case 2:
- __asm__("lcall *(%%esi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=a" (result)
- : "0" (PCIBIOS_WRITE_CONFIG_WORD),
- "c" (value),
- "b" (bx),
- "D" ((long)reg),
- "S" (&pci_indirect));
- break;
- case 4:
- __asm__("lcall *(%%esi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=a" (result)
- : "0" (PCIBIOS_WRITE_CONFIG_DWORD),
- "c" (value),
- "b" (bx),
- "D" ((long)reg),
- "S" (&pci_indirect));
- break;
- }
-
- spin_unlock_irqrestore(&pci_config_lock, flags);
-
- return (int)((result & 0xff00) >> 8);
-}
-
-
-/*
- * Function table for BIOS32 access
- */
-
-static struct pci_raw_ops pci_bios_access = {
- .read = pci_bios_read,
- .write = pci_bios_write
-};
-
-/*
- * Try to find PCI BIOS.
- */
-
-static struct pci_raw_ops * __devinit pci_find_bios(void)
-{
- union bios32 *check;
- unsigned char sum;
- int i, length;
-
- /*
- * Follow the standard procedure for locating the BIOS32 Service
- * directory by scanning the permissible address range from
- * 0xe0000 through 0xfffff for a valid BIOS32 structure.
- */
-
- for (check = (union bios32 *) __va(0xe0000);
- check <= (union bios32 *) __va(0xffff0);
- ++check) {
- long sig;
- if (probe_kernel_address(&check->fields.signature, sig))
- continue;
-
- if (check->fields.signature != BIOS32_SIGNATURE)
- continue;
- length = check->fields.length * 16;
- if (!length)
- continue;
- sum = 0;
- for (i = 0; i < length ; ++i)
- sum += check->chars[i];
- if (sum != 0)
- continue;
- if (check->fields.revision != 0) {
- printk("PCI: unsupported BIOS32 revision %d at 0x%p\n",
- check->fields.revision, check);
- continue;
- }
- DBG("PCI: BIOS32 Service Directory structure at 0x%p\n", check);
- if (check->fields.entry >= 0x100000) {
- printk("PCI: BIOS32 entry (0x%p) in high memory, "
- "cannot use.\n", check);
- return NULL;
- } else {
- unsigned long bios32_entry = check->fields.entry;
- DBG("PCI: BIOS32 Service Directory entry at 0x%lx\n",
- bios32_entry);
- bios32_indirect.address = bios32_entry + PAGE_OFFSET;
- if (check_pcibios())
- return &pci_bios_access;
- }
- break; /* Hopefully more than one BIOS32 cannot happen... */
- }
-
- return NULL;
-}
-
-/*
- * Sort the device list according to PCI BIOS. Nasty hack, but since some
- * fool forgot to define the `correct' device order in the PCI BIOS specs
- * and we want to be (possibly bug-to-bug ;-]) compatible with older kernels
- * which used BIOS ordering, we are bound to do this...
- */
-
-void __devinit pcibios_sort(void)
-{
- LIST_HEAD(sorted_devices);
- struct list_head *ln;
- struct pci_dev *dev, *d;
- int idx, found;
- unsigned char bus, devfn;
-
- DBG("PCI: Sorting device list...\n");
- while (!list_empty(&pci_devices)) {
- ln = pci_devices.next;
- dev = pci_dev_g(ln);
- idx = found = 0;
- while (pci_bios_find_device(dev->vendor, dev->device, idx, &bus, &devfn) == PCIBIOS_SUCCESSFUL) {
- idx++;
- list_for_each(ln, &pci_devices) {
- d = pci_dev_g(ln);
- if (d->bus->number == bus && d->devfn == devfn) {
- list_move_tail(&d->global_list, &sorted_devices);
- if (d == dev)
- found = 1;
- break;
- }
- }
- if (ln == &pci_devices) {
- printk(KERN_WARNING "PCI: BIOS reporting unknown device %02x:%02x\n", bus, devfn);
- /*
- * We must not continue scanning as several buggy BIOSes
- * return garbage after the last device. Grr.
- */
- break;
- }
- }
- if (!found) {
- printk(KERN_WARNING "PCI: Device %s not found by BIOS\n",
- pci_name(dev));
- list_move_tail(&dev->global_list, &sorted_devices);
- }
- }
- list_splice(&sorted_devices, &pci_devices);
-}
-
-/*
- * BIOS Functions for IRQ Routing
- */
-
-struct irq_routing_options {
- u16 size;
- struct irq_info *table;
- u16 segment;
-} __attribute__((packed));
-
-struct irq_routing_table * pcibios_get_irq_routing_table(void)
-{
- struct irq_routing_options opt;
- struct irq_routing_table *rt = NULL;
- int ret, map;
- unsigned long page;
-
- if (!pci_bios_present)
- return NULL;
- page = __get_free_page(GFP_KERNEL);
- if (!page)
- return NULL;
- opt.table = (struct irq_info *) page;
- opt.size = PAGE_SIZE;
- opt.segment = __KERNEL_DS;
-
- DBG("PCI: Fetching IRQ routing table... ");
- __asm__("push %%es\n\t"
- "push %%ds\n\t"
- "pop %%es\n\t"
- "lcall *(%%esi); cld\n\t"
- "pop %%es\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=a" (ret),
- "=b" (map),
- "=m" (opt)
- : "0" (PCIBIOS_GET_ROUTING_OPTIONS),
- "1" (0),
- "D" ((long) &opt),
- "S" (&pci_indirect),
- "m" (opt)
- : "memory");
- DBG("OK ret=%d, size=%d, map=%x\n", ret, opt.size, map);
- if (ret & 0xff00)
- printk(KERN_ERR "PCI: Error %02x when fetching IRQ routing table.\n", (ret >> 8) & 0xff);
- else if (opt.size) {
- rt = kmalloc(sizeof(struct irq_routing_table) + opt.size, GFP_KERNEL);
- if (rt) {
- memset(rt, 0, sizeof(struct irq_routing_table));
- rt->size = opt.size + sizeof(struct irq_routing_table);
- rt->exclusive_irqs = map;
- memcpy(rt->slots, (void *) page, opt.size);
- printk(KERN_INFO "PCI: Using BIOS Interrupt Routing Table\n");
- }
- }
- free_page(page);
- return rt;
-}
-EXPORT_SYMBOL(pcibios_get_irq_routing_table);
-
-int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq)
-{
- int ret;
-
- __asm__("lcall *(%%esi); cld\n\t"
- "jc 1f\n\t"
- "xor %%ah, %%ah\n"
- "1:"
- : "=a" (ret)
- : "0" (PCIBIOS_SET_PCI_HW_INT),
- "b" ((dev->bus->number << 8) | dev->devfn),
- "c" ((irq << 8) | (pin + 10)),
- "S" (&pci_indirect));
- return !(ret & 0xff00);
-}
-EXPORT_SYMBOL(pcibios_set_irq_routing);
-
-void __init pci_pcbios_init(void)
-{
- if ((pci_probe & PCI_PROBE_BIOS)
- && ((raw_pci_ops = pci_find_bios()))) {
- pci_probe |= PCI_BIOS_SORT;
- pci_bios_present = 1;
- }
-}
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 08:18:30 +0000